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A. Collier Cameron - One of the best experts on this subject based on the ideXlab platform.
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Wasp-South hot Jupiters : Wasp-178b, Wasp-184b, Wasp-185b & Wasp-192b
Monthly Notices of the Royal Astronomical Society, 2019Co-Authors: Coel Hellier, David R. Anderson, Laetitia Delrez, A. Collier Cameron, Michaël Gillon, François Bouchy, K. Barkaoui, Zouhair Benkhaldoun, Artem Burdanov, Emmanuel JehinAbstract:ABSTRACTWe report on four new transiting hot Jupiters discovered by the Wasp-South survey. Wasp-178b transits a V = 9.9, A1V star with Teff = 9350 ± 150 K, the second-hottest transit host known. It has a highly bloated radius of 1.81 ± 0.09 RJup, in line with the known correlation between high irradiation and large size. With an estimated temperature of 2470 ± 60 K, the planet is one of the best targets for studying ultrahot Jupiters that is visible from the Southern hemisphere. The three host stars Wasp-184, Wasp-185, and Wasp-192 are all post-main-sequence G0 stars of ages 4–8 Gyr. The larger stellar radii (1.3–1.7 M⊙) mean that the transits are relatively shallow (0.7–0.9 per cent) even though the planets have moderately inflated radii of 1.2–1.3 RJup. Wasp-185b has an eccentric orbit (e = 0.24) and a relatively long orbital period of 9.4 d. A star that is 4.6 arcsec from Wasp-185 and 4.4 mag fainter might be physically associated.
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Wasp-169, Wasp-171, Wasp-175 and Wasp-182 : three hot Jupiters and one bloated sub-Saturn mass planet discovered by Wasp-south
Monthly Notices of the Royal Astronomical Society, 2019Co-Authors: Louise D. Nielsen, David R. Anderson, Laetitia Delrez, A. Collier Cameron, François Bouchy, Oliver Turner, K. Barkaoui, Zouhair Benkhaldoun, Artem Burdanov, Michaël GillonAbstract:We present the discovery of four new giant planets from \Wasp, three hot Jupiters and one bloated sub-Saturn mass planet; Wasp-169b, Wasp-171b, Wasp-175b and Wasp-182b. Besides the discovery photometry from \Wasp\ we use radial velocity measurements from CORALIE and HARPS as well as follow-up photometry from EulerCam, TRAPPIST-North and -South and SPECULOOS. Wasp-169b is a low density Jupiter ($M=0.561 \pm 0.061~\mathrm{M_{Jup}}, R=1.304^{+0.150}_{-0.073} ~\mathrm{R_{Jup}}$) orbiting a V=12.17 F8 sub-giant in a 5.611~day orbit. Wasp-171b is a typical hot Jupiter ($M=1.084 \pm 0.094~\mathrm{M_{Jup}}, R=0.98^{+0.07}_{-0.04} ~\mathrm{R_{Jup}}$, $P=3.82~\mathrm{days}$) around a V=13.05 G0 star. We find a linear drift in the radial velocities of Wasp-171 spanning 3.5 years, indicating the possibility of an additional outer planet or stellar companion. Wasp-175b is an inflated hot Jupiter ($M=0.99 \pm 0.13~\mathrm{M_{Jup}}, R=1.208 \pm 0.081 ~\mathrm{R_{Jup}}$, $P=3.07~\mathrm{days}$) around a V=12.04 F7 star, which possibly is part of a binary system with a star 7.9\arcsec\ away. Wasp-182b is a bloated sub-Saturn mass planet ($M=0.148 \pm 0.011~\mathrm{M_{Jup}}, R=0.850\pm 0.030 ~\mathrm{R_{Jup}}$) around a metal rich V=11.98 G5 star ([Fe/H]$=0.27 \pm 0.11$). With a orbital period of $P=3.377~\mathrm{days}$, it sits right in the apex of the sub-Jovian desert, bordering the upper- and lower edge of the desert in both the mass-period and radius-period plane. Wasp-169b, Wasp-175b and Wasp-182b are promising targets for atmospheric characterisation through transmission spectroscopy, with expected transmission signals of 121, 150 and 264 ppm respectively.
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Wasp-169, Wasp-171, Wasp-175 and Wasp-182: One bloated sub-Saturn and three hot Jupiters discovered by Wasp-south
arXiv: Earth and Planetary Astrophysics, 2019Co-Authors: Louise D. Nielsen, David R. Anderson, O. D. Turner, A. Collier Cameron, F. Bouchy, L. Delrez, K. Barkaoui, Artem Burdanov, M. Gillon, Elsa DucrotAbstract:We present the discovery of four giant Wasp-south planets, three hot Jupiters and one bloated sub-Saturn; Wasp-169b, Wasp-171b, Wasp-175b and Wasp-182b. Besides the discovery photometry from Wasp-south we use follow-up observations from CORALIE, HARPS, EulerCam, TRAPPIST-North and -South and SPECULOOS. Wasp-169b is a low density Jupiter ($M=0.561 \pm 0.061~\mathrm{M_{Jup}}, R=1.304^{+0.150}_{-0.073} ~\mathrm{R_{Jup}}$) orbiting a V=12.17 F8 sub-giant in a 5.611~day orbit. Wasp-171b is a typical hot Jupiter ($M=1.084 \pm 0.094~\mathrm{M_{Jup}}, R=0.98^{+0.07}_{-0.04} ~\mathrm{R_{Jup}}$, $P=3.82~\mathrm{days}$) around a V=13.05 G0 star. We find a linear drift in the radial velocities of Wasp-171 spanning 3.5 years, indicating the possibility of an additional outer planet. Wasp-175b is an inflated hot Jupiter ($M=0.99 \pm 0.13~\mathrm{M_{Jup}}, R=1.208 \pm 0.081 ~\mathrm{R_{Jup}}$, $P=3.07~\mathrm{days}$) around a V=12.04 F7 star, which possibly is part of a binary system with a star 7.9\arcsec\ away. Wasp-182b is a bloated sub-Saturn ($M=0.148 \pm 0.011~\mathrm{M_{Jup}}, R=0.850\pm 0.030 ~\mathrm{R_{Jup}}$) around a metal rich V=11.98 G5 star ([Fe/H]$=0.27 \pm 0.11$). With a orbital period of $P=3.377~\mathrm{days}$, it sits right in the apex of the sub-Jovian desert, bordering the upper- and lower edge of the desert in both the mass-period and radius-period plane. Wasp-169b, Wasp-175b and Wasp-182b are promising targets for atmospheric characterisation through transmission spectroscopy, with expected transmission signals of 121, 150 and 264 ppm respectively.
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The discovery of Wasp-134b, Wasp-134c, Wasp-137b, Wasp-143b and Wasp-146b: three hot Jupiters and a pair of warm Jupiters orbiting Solar-type stars
arXiv: Earth and Planetary Astrophysics, 2018Co-Authors: David R. Anderson, Laetitia Delrez, A. Collier Cameron, Michaël Gillon, Coel Hellier, Emmanuel Jehin, F. Bouchy, David A. Brown, J. I. González Hernández, Monika LendlAbstract:We report the discovery by Wasp of five planets orbiting moderately bright ($V$ = 11.0-12.9) Solar-type stars. Wasp-137b, Wasp-143b and Wasp-146b are typical hot Jupiters in orbits of 3-4 d and with masses in the range 0.68--1.11 $M_{\rm Jup}$. Wasp-134 is a metal-rich ([Fe/H] = +0.40 $\pm$ 0.07]) G4 star orbited by two warm Jupiters: Wasp-134b ($M_{\rm pl}$ = 1.41 $M_{\rm Jup}$; $P = 10.1$ d; $e = 0.15 \pm 0.01$; $T_{\rm eql}$ = 950 K) and Wasp-134c ($M_{\rm pl} \sin i$ = 0.70 $M_{\rm Jup}$; $P = 70.0$ d; $e = 0.17 \pm 0.09$; $T_{\rm eql}$ = 500 K). From observations of the Rossiter-McLaughlin effect of Wasp-134b, we find its orbit to be misaligned with the spin of its star ($\lambda = -44 \pm 10^\circ$). Wasp-134 is a rare example of a system with a short-period giant planet and a nearby giant companion. In-situ formation or disc migration seem more likely explanations for such systems than does high-eccentricity migration.
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Wasp-120 b, Wasp-122 b, AND Wasp-123 b: Three Newly Discovered Planets from the Wasp-South Survey
Publications of the Astronomical Society of the Pacific, 2016Co-Authors: O. D. Turner, David R. Anderson, Laetitia Delrez, A. Collier Cameron, Daniel F. Evans, Michaël Gillon, Coel Hellier, Emmanuel Jehin, Monika Lendl, Pierre F. L. MaxtedAbstract:We present the discovery by the Wasp-South survey of three planets transiting moderately bright stars (V � 11). Wasp-120b is a massive (5.0MJup) planet in a 3.6-day orbit that we find likely to be eccentric (e = 0.059 +0.025 −0.018 ) around an F5 star. Wasp-122b is a hot-Jupiter (1.37MJup, 1.79RJup) in a 1.7-day orbit about a G4 star. Our predicted transit depth variation caused by the atmosphere of Wasp-122b suggests it is well suited to characterisation. Wasp-123b is a hot-Jupiter (0.92MJup, 1.33RJup) in a 3.0-day orbit around an old (� 7 Gyr) G5 star. Subject headings: Planetary systems — stars: individual (Wasp-120,Wasp-122,Wasp-123)
David R. Anderson - One of the best experts on this subject based on the ideXlab platform.
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Wasp-South hot Jupiters : Wasp-178b, Wasp-184b, Wasp-185b & Wasp-192b
Monthly Notices of the Royal Astronomical Society, 2019Co-Authors: Coel Hellier, David R. Anderson, Laetitia Delrez, A. Collier Cameron, Michaël Gillon, François Bouchy, K. Barkaoui, Zouhair Benkhaldoun, Artem Burdanov, Emmanuel JehinAbstract:ABSTRACTWe report on four new transiting hot Jupiters discovered by the Wasp-South survey. Wasp-178b transits a V = 9.9, A1V star with Teff = 9350 ± 150 K, the second-hottest transit host known. It has a highly bloated radius of 1.81 ± 0.09 RJup, in line with the known correlation between high irradiation and large size. With an estimated temperature of 2470 ± 60 K, the planet is one of the best targets for studying ultrahot Jupiters that is visible from the Southern hemisphere. The three host stars Wasp-184, Wasp-185, and Wasp-192 are all post-main-sequence G0 stars of ages 4–8 Gyr. The larger stellar radii (1.3–1.7 M⊙) mean that the transits are relatively shallow (0.7–0.9 per cent) even though the planets have moderately inflated radii of 1.2–1.3 RJup. Wasp-185b has an eccentric orbit (e = 0.24) and a relatively long orbital period of 9.4 d. A star that is 4.6 arcsec from Wasp-185 and 4.4 mag fainter might be physically associated.
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Wasp-169, Wasp-171, Wasp-175 and Wasp-182 : three hot Jupiters and one bloated sub-Saturn mass planet discovered by Wasp-south
Monthly Notices of the Royal Astronomical Society, 2019Co-Authors: Louise D. Nielsen, David R. Anderson, Laetitia Delrez, A. Collier Cameron, François Bouchy, Oliver Turner, K. Barkaoui, Zouhair Benkhaldoun, Artem Burdanov, Michaël GillonAbstract:We present the discovery of four new giant planets from \Wasp, three hot Jupiters and one bloated sub-Saturn mass planet; Wasp-169b, Wasp-171b, Wasp-175b and Wasp-182b. Besides the discovery photometry from \Wasp\ we use radial velocity measurements from CORALIE and HARPS as well as follow-up photometry from EulerCam, TRAPPIST-North and -South and SPECULOOS. Wasp-169b is a low density Jupiter ($M=0.561 \pm 0.061~\mathrm{M_{Jup}}, R=1.304^{+0.150}_{-0.073} ~\mathrm{R_{Jup}}$) orbiting a V=12.17 F8 sub-giant in a 5.611~day orbit. Wasp-171b is a typical hot Jupiter ($M=1.084 \pm 0.094~\mathrm{M_{Jup}}, R=0.98^{+0.07}_{-0.04} ~\mathrm{R_{Jup}}$, $P=3.82~\mathrm{days}$) around a V=13.05 G0 star. We find a linear drift in the radial velocities of Wasp-171 spanning 3.5 years, indicating the possibility of an additional outer planet or stellar companion. Wasp-175b is an inflated hot Jupiter ($M=0.99 \pm 0.13~\mathrm{M_{Jup}}, R=1.208 \pm 0.081 ~\mathrm{R_{Jup}}$, $P=3.07~\mathrm{days}$) around a V=12.04 F7 star, which possibly is part of a binary system with a star 7.9\arcsec\ away. Wasp-182b is a bloated sub-Saturn mass planet ($M=0.148 \pm 0.011~\mathrm{M_{Jup}}, R=0.850\pm 0.030 ~\mathrm{R_{Jup}}$) around a metal rich V=11.98 G5 star ([Fe/H]$=0.27 \pm 0.11$). With a orbital period of $P=3.377~\mathrm{days}$, it sits right in the apex of the sub-Jovian desert, bordering the upper- and lower edge of the desert in both the mass-period and radius-period plane. Wasp-169b, Wasp-175b and Wasp-182b are promising targets for atmospheric characterisation through transmission spectroscopy, with expected transmission signals of 121, 150 and 264 ppm respectively.
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Wasp-169, Wasp-171, Wasp-175 and Wasp-182: One bloated sub-Saturn and three hot Jupiters discovered by Wasp-south
arXiv: Earth and Planetary Astrophysics, 2019Co-Authors: Louise D. Nielsen, David R. Anderson, O. D. Turner, A. Collier Cameron, F. Bouchy, L. Delrez, K. Barkaoui, Artem Burdanov, M. Gillon, Elsa DucrotAbstract:We present the discovery of four giant Wasp-south planets, three hot Jupiters and one bloated sub-Saturn; Wasp-169b, Wasp-171b, Wasp-175b and Wasp-182b. Besides the discovery photometry from Wasp-south we use follow-up observations from CORALIE, HARPS, EulerCam, TRAPPIST-North and -South and SPECULOOS. Wasp-169b is a low density Jupiter ($M=0.561 \pm 0.061~\mathrm{M_{Jup}}, R=1.304^{+0.150}_{-0.073} ~\mathrm{R_{Jup}}$) orbiting a V=12.17 F8 sub-giant in a 5.611~day orbit. Wasp-171b is a typical hot Jupiter ($M=1.084 \pm 0.094~\mathrm{M_{Jup}}, R=0.98^{+0.07}_{-0.04} ~\mathrm{R_{Jup}}$, $P=3.82~\mathrm{days}$) around a V=13.05 G0 star. We find a linear drift in the radial velocities of Wasp-171 spanning 3.5 years, indicating the possibility of an additional outer planet. Wasp-175b is an inflated hot Jupiter ($M=0.99 \pm 0.13~\mathrm{M_{Jup}}, R=1.208 \pm 0.081 ~\mathrm{R_{Jup}}$, $P=3.07~\mathrm{days}$) around a V=12.04 F7 star, which possibly is part of a binary system with a star 7.9\arcsec\ away. Wasp-182b is a bloated sub-Saturn ($M=0.148 \pm 0.011~\mathrm{M_{Jup}}, R=0.850\pm 0.030 ~\mathrm{R_{Jup}}$) around a metal rich V=11.98 G5 star ([Fe/H]$=0.27 \pm 0.11$). With a orbital period of $P=3.377~\mathrm{days}$, it sits right in the apex of the sub-Jovian desert, bordering the upper- and lower edge of the desert in both the mass-period and radius-period plane. Wasp-169b, Wasp-175b and Wasp-182b are promising targets for atmospheric characterisation through transmission spectroscopy, with expected transmission signals of 121, 150 and 264 ppm respectively.
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The discovery of Wasp-134b, Wasp-134c, Wasp-137b, Wasp-143b and Wasp-146b: three hot Jupiters and a pair of warm Jupiters orbiting Solar-type stars
arXiv: Earth and Planetary Astrophysics, 2018Co-Authors: David R. Anderson, Laetitia Delrez, A. Collier Cameron, Michaël Gillon, Coel Hellier, Emmanuel Jehin, F. Bouchy, David A. Brown, J. I. González Hernández, Monika LendlAbstract:We report the discovery by Wasp of five planets orbiting moderately bright ($V$ = 11.0-12.9) Solar-type stars. Wasp-137b, Wasp-143b and Wasp-146b are typical hot Jupiters in orbits of 3-4 d and with masses in the range 0.68--1.11 $M_{\rm Jup}$. Wasp-134 is a metal-rich ([Fe/H] = +0.40 $\pm$ 0.07]) G4 star orbited by two warm Jupiters: Wasp-134b ($M_{\rm pl}$ = 1.41 $M_{\rm Jup}$; $P = 10.1$ d; $e = 0.15 \pm 0.01$; $T_{\rm eql}$ = 950 K) and Wasp-134c ($M_{\rm pl} \sin i$ = 0.70 $M_{\rm Jup}$; $P = 70.0$ d; $e = 0.17 \pm 0.09$; $T_{\rm eql}$ = 500 K). From observations of the Rossiter-McLaughlin effect of Wasp-134b, we find its orbit to be misaligned with the spin of its star ($\lambda = -44 \pm 10^\circ$). Wasp-134 is a rare example of a system with a short-period giant planet and a nearby giant companion. In-situ formation or disc migration seem more likely explanations for such systems than does high-eccentricity migration.
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Wasp-113b and Wasp-114b, two inflated hot Jupiters with contrasting densities
Astronomy & Astrophysics, 2016Co-Authors: Susana Barros, David J. A. Brown, Guillaume Hébrard, Y. Gómez Maqueo Chew, David R. Anderson, P. Boumis, Laetitia Delrez, K. L. Hay, K. W. F. Lam, Joe LlamaAbstract:Aims. We present the discovery and characterisation of the exoplanets Wasp-113b and Wasp-114b by the Wasp surveys, SOPHIE and CORALIE. Methods. The planetary nature of the systems was established by performing follow-up photometric and spectroscopic observations. The follow-up data were combined with the Wasp-photometry and analysed with an MCMC code to obtain system parameters. Results. The host stars Wasp-113 and Wasp-114 are very similar. They are both early G-type stars with an effective temperature of similar to 5900 K, [Fe/H] similar to 0.12, and log g similar to 4.1 dex. However, Wasp-113 is older than Wasp-114. Although the planetary companions have similar radii, Wasp-114b is almost four times heavier than Wasp-113b. Wasp-113b has a mass of 0.48 M-Jup and an orbital period of similar to 4.5 days; Wasp-114b has a mass of 1.77 M-Jup and an orbital period of similar to 1.5 days. Both planets have inflated radii, in particular Wasp-113 with a radius anomaly of R = 0.35. The high scale height ofWasp-113b (similar to 950 km) makes it a good target for follow-up atmospheric observations.
Michaël Gillon - One of the best experts on this subject based on the ideXlab platform.
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Wasp-South hot Jupiters : Wasp-178b, Wasp-184b, Wasp-185b & Wasp-192b
Monthly Notices of the Royal Astronomical Society, 2019Co-Authors: Coel Hellier, David R. Anderson, Laetitia Delrez, A. Collier Cameron, Michaël Gillon, François Bouchy, K. Barkaoui, Zouhair Benkhaldoun, Artem Burdanov, Emmanuel JehinAbstract:ABSTRACTWe report on four new transiting hot Jupiters discovered by the Wasp-South survey. Wasp-178b transits a V = 9.9, A1V star with Teff = 9350 ± 150 K, the second-hottest transit host known. It has a highly bloated radius of 1.81 ± 0.09 RJup, in line with the known correlation between high irradiation and large size. With an estimated temperature of 2470 ± 60 K, the planet is one of the best targets for studying ultrahot Jupiters that is visible from the Southern hemisphere. The three host stars Wasp-184, Wasp-185, and Wasp-192 are all post-main-sequence G0 stars of ages 4–8 Gyr. The larger stellar radii (1.3–1.7 M⊙) mean that the transits are relatively shallow (0.7–0.9 per cent) even though the planets have moderately inflated radii of 1.2–1.3 RJup. Wasp-185b has an eccentric orbit (e = 0.24) and a relatively long orbital period of 9.4 d. A star that is 4.6 arcsec from Wasp-185 and 4.4 mag fainter might be physically associated.
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Wasp-169, Wasp-171, Wasp-175 and Wasp-182 : three hot Jupiters and one bloated sub-Saturn mass planet discovered by Wasp-south
Monthly Notices of the Royal Astronomical Society, 2019Co-Authors: Louise D. Nielsen, David R. Anderson, Laetitia Delrez, A. Collier Cameron, François Bouchy, Oliver Turner, K. Barkaoui, Zouhair Benkhaldoun, Artem Burdanov, Michaël GillonAbstract:We present the discovery of four new giant planets from \Wasp, three hot Jupiters and one bloated sub-Saturn mass planet; Wasp-169b, Wasp-171b, Wasp-175b and Wasp-182b. Besides the discovery photometry from \Wasp\ we use radial velocity measurements from CORALIE and HARPS as well as follow-up photometry from EulerCam, TRAPPIST-North and -South and SPECULOOS. Wasp-169b is a low density Jupiter ($M=0.561 \pm 0.061~\mathrm{M_{Jup}}, R=1.304^{+0.150}_{-0.073} ~\mathrm{R_{Jup}}$) orbiting a V=12.17 F8 sub-giant in a 5.611~day orbit. Wasp-171b is a typical hot Jupiter ($M=1.084 \pm 0.094~\mathrm{M_{Jup}}, R=0.98^{+0.07}_{-0.04} ~\mathrm{R_{Jup}}$, $P=3.82~\mathrm{days}$) around a V=13.05 G0 star. We find a linear drift in the radial velocities of Wasp-171 spanning 3.5 years, indicating the possibility of an additional outer planet or stellar companion. Wasp-175b is an inflated hot Jupiter ($M=0.99 \pm 0.13~\mathrm{M_{Jup}}, R=1.208 \pm 0.081 ~\mathrm{R_{Jup}}$, $P=3.07~\mathrm{days}$) around a V=12.04 F7 star, which possibly is part of a binary system with a star 7.9\arcsec\ away. Wasp-182b is a bloated sub-Saturn mass planet ($M=0.148 \pm 0.011~\mathrm{M_{Jup}}, R=0.850\pm 0.030 ~\mathrm{R_{Jup}}$) around a metal rich V=11.98 G5 star ([Fe/H]$=0.27 \pm 0.11$). With a orbital period of $P=3.377~\mathrm{days}$, it sits right in the apex of the sub-Jovian desert, bordering the upper- and lower edge of the desert in both the mass-period and radius-period plane. Wasp-169b, Wasp-175b and Wasp-182b are promising targets for atmospheric characterisation through transmission spectroscopy, with expected transmission signals of 121, 150 and 264 ppm respectively.
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The discovery of Wasp-134b, Wasp-134c, Wasp-137b, Wasp-143b and Wasp-146b: three hot Jupiters and a pair of warm Jupiters orbiting Solar-type stars
arXiv: Earth and Planetary Astrophysics, 2018Co-Authors: David R. Anderson, Laetitia Delrez, A. Collier Cameron, Michaël Gillon, Coel Hellier, Emmanuel Jehin, F. Bouchy, David A. Brown, J. I. González Hernández, Monika LendlAbstract:We report the discovery by Wasp of five planets orbiting moderately bright ($V$ = 11.0-12.9) Solar-type stars. Wasp-137b, Wasp-143b and Wasp-146b are typical hot Jupiters in orbits of 3-4 d and with masses in the range 0.68--1.11 $M_{\rm Jup}$. Wasp-134 is a metal-rich ([Fe/H] = +0.40 $\pm$ 0.07]) G4 star orbited by two warm Jupiters: Wasp-134b ($M_{\rm pl}$ = 1.41 $M_{\rm Jup}$; $P = 10.1$ d; $e = 0.15 \pm 0.01$; $T_{\rm eql}$ = 950 K) and Wasp-134c ($M_{\rm pl} \sin i$ = 0.70 $M_{\rm Jup}$; $P = 70.0$ d; $e = 0.17 \pm 0.09$; $T_{\rm eql}$ = 500 K). From observations of the Rossiter-McLaughlin effect of Wasp-134b, we find its orbit to be misaligned with the spin of its star ($\lambda = -44 \pm 10^\circ$). Wasp-134 is a rare example of a system with a short-period giant planet and a nearby giant companion. In-situ formation or disc migration seem more likely explanations for such systems than does high-eccentricity migration.
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Wasp-120 b, Wasp-122 b, AND Wasp-123 b: Three Newly Discovered Planets from the Wasp-South Survey
Publications of the Astronomical Society of the Pacific, 2016Co-Authors: O. D. Turner, David R. Anderson, Laetitia Delrez, A. Collier Cameron, Daniel F. Evans, Michaël Gillon, Coel Hellier, Emmanuel Jehin, Monika Lendl, Pierre F. L. MaxtedAbstract:We present the discovery by the Wasp-South survey of three planets transiting moderately bright stars (V � 11). Wasp-120b is a massive (5.0MJup) planet in a 3.6-day orbit that we find likely to be eccentric (e = 0.059 +0.025 −0.018 ) around an F5 star. Wasp-122b is a hot-Jupiter (1.37MJup, 1.79RJup) in a 1.7-day orbit about a G4 star. Our predicted transit depth variation caused by the atmosphere of Wasp-122b suggests it is well suited to characterisation. Wasp-123b is a hot-Jupiter (0.92MJup, 1.33RJup) in a 3.0-day orbit around an old (� 7 Gyr) G5 star. Subject headings: Planetary systems — stars: individual (Wasp-120,Wasp-122,Wasp-123)
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hot jupiters with relatives discovery of additional planets in orbit around Wasp 41 and Wasp 47
arXiv: Earth and Planetary Astrophysics, 2015Co-Authors: M Neveuvanmalle, Laetitia Delrez, Michaël Gillon, D. R. Anderson, R. F. Diaz, Didier Queloz, D A Brown, Collier A Cameron, C Hellier, Emmanuel JehinAbstract:We report the discovery of two additional planetary companions to Wasp-41 and Wasp-47. Wasp-41 c is a planet of minimum mass 3.18 $\pm$ 0.20 M$_{\rm Jup}$ and eccentricity 0.29 $\pm$ 0.02, and it orbits in 421 $\pm$ 2 days. Wasp-47 c is a planet of minimum mass 1.24 $\pm$ 0.22 M$_{\rm Jup}$ and eccentricity 0.13 $\pm$ 0.10, and it orbits in 572 $\pm$ 7 days. Unlike most of the planetary systems that include a hot Jupiter, these two systems with a hot Jupiter have a long-period planet located at only $\sim$1 au from their host star. Wasp-41 is a rather young star known to be chromospherically active. To differentiate its magnetic cycle from the radial velocity effect induced by the second planet, we used the emission in the H$\alpha$ line and find this indicator well suited to detecting the stellar activity pattern and the magnetic cycle. The analysis of the Rossiter-McLaughlin effect induced by Wasp-41 b suggests that the planet could be misaligned, though an aligned orbit cannot be excluded. Wasp-47 has recently been found to host two additional transiting super Earths. With such an unprecedented architecture, the Wasp-47 system will be very important for understanding planetary migration.
Don Pollacco - One of the best experts on this subject based on the ideXlab platform.
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Two transiting hot Jupiters from the Wasp survey: Wasp-150b and Wasp-176b
The Astronomical Journal, 2020Co-Authors: Benjamin F. Cooke, David J. A. Brown, P. Boumis, François Bouchy, Zouhair Benkhaldoun, Don Pollacco, Y. Almleaky, Khalid Barkaoui, James A. Blake, Ivan BruniAbstract:We report the discovery of two transiting exoplanets from the Wasp survey, Wasp-150b and Wasp-176b. Wasp-150b is an eccentric (e = 0.38) hot Jupiter on a 5.6 day orbit around a V = 12.03, F8 main-sequence host. The host star has a mass and radius of 1.4R-J, leading to a large planetary bulk density of 6.4 rho(J). Wasp-150b is found to be similar to 3 Gyr old, well below its circularization timescale, supporting the eccentric nature of the planet. Wasp-176b is a hot Jupiter planet on a 3.9 day orbit around a V = 12.01, F9 sub-giant host. The host star has a mass and radius of 1.3 M and 1.9 R. Wasp-176b has a mass and radius of 0.86 M-J and 1.5 R-J, respectively, leading to a planetary bulk density of 0.23 rho(J).
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Three Wasp-south transiting exoplanets : Wasp-74b, Wasp-83b, and Wasp-89b
The Astronomical Journal, 2015Co-Authors: Coel Hellier, David R. Anderson, Laetitia Delrez, A. Collier Cameron, Michaël Gillon, Emmanuel Jehin, Monika Lendl, Pierre F. L. Maxted, Francesco Pepe, Don PollaccoAbstract:We report the discovery of three new transiting hot Jupiters by Wasp-South together with the TRAPPIST photometer and the Euler/CORALIE spectrograph. Wasp-74b orbits a star of V = 9.7, making it one of the brighter systems accessible to Southern telescopes. It is a 0.95 MJup planet with a moderately bloated radius of 1.5 RJup in a 2-d orbit around a slightly evolved F9 star. Wasp-83b is a Saturn-mass planet at 0.3 MJup with a radius of 1.0 RJup. It is in a 5-d orbit around a fainter (V = 12.9) G8 star. Wasp-89b is a 6 MJup planet in a 3-d orbit with an eccentricity of e = 0.2. It is thus similar to massive, eccentric planets such as XO-3b and HAT-P-2b, except that those planets orbit F stars whereas Wasp-89 is a K star. The V = 13.1 host star is magnetically active, showing a rotation period of 20.2 d, while star spots are visible in the transits. There are indications that the planet’s orbit is aligned with the stellar spin. Wasp-89 is a good target for an extensive study of transits of star spots. Subject headings: planetary systems — stars: individual (Wasp-74, Wasp-83, Wasp-89)
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Three Wasp-South transiting exoplanets: Wasp-74b, Wasp-83b & Wasp-89b
arXiv: Earth and Planetary Astrophysics, 2014Co-Authors: Coel Hellier, David R. Anderson, A. Collier Cameron, Michaël Gillon, Monika Lendl, Pierre F. L. Maxted, L. Delrez, Francesco Pepe, E. Jehin, Don PollaccoAbstract:We report the discovery of three new transiting hot Jupiters by Wasp-South together with the TRAPPIST photometer and the Euler/CORALIE spectrograph. Wasp-74b orbits a star of V = 9.7, making it one of the brighter systems accessible to Southern telescopes. It is a 0.95 M_Jup planet with a moderately bloated radius of 1.5 R_Jup in a 2-d orbit around a slightly evolved F9 star. Wasp-83b is a Saturn-mass planet at 0.3 M_Jup with a radius of 1.0 R_Jup. It is in a 5-d orbit around a fainter (V = 12.9) G8 star. Wasp-89b is a 6 M_Jup planet in a 3-d orbit with an eccentricity of e = 0.2. It is thus similar to massive, eccentric planets such as XO-3b and HAT-P-2b, except that those planets orbit F stars whereas Wasp-89 is a K star. The V = 13.1 host star is magnetically active, showing a rotation period of 20.2 d, while star spots are visible in the transits. There are indications that the planet's orbit is aligned with the stellar spin. Wasp-89 is a good target for an extensive study of transits of star spots.
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Discovery of Wasp-65b and Wasp-75b: Two hot Jupiters without highly inflated radii
Astronomy & Astrophysics, 2013Co-Authors: Y. Gómez Maqueo Chew, A. Collier Cameron, Michaël Gillon, Monika Lendl, Amanda P. Doyle, D. J. A. Brown, Don Pollacco, Barry Smalley, Francesca Faedi, Amaury H. M. J. TriaudAbstract:We report the discovery of two transiting hot Jupiters, Wasp-65b (Mpl = 1.55 ± 0.16 MJ; Rpl = 1.11 ± 0.06 RJ), and Wasp-75b (Mpl = 1.07 ± 0.05 MJ; Rpl = 1.27 ± 0.05 RJ). They orbit their host star every ∼2.311, and ∼2.484 days, respectively. The planet host Wasp-65 is a G6 star (Teff = 5600 K, [Fe/H] = −0.07 ± 0.07, age 8 Gyr); Wasp-75 is an F9 star (Teff = 6100 K, [Fe/H] = 0.07 ± 0.09, age ∼ 3 Gyr). Wasp-65b is one of the densest known exoplanets in the mass range 0.1 and 2.0 MJ (ρpl = 1.13 ± 0.08 ρJ), a mass range where a large fraction of planets are found to be inflated with respect to theoretical planet models. Wasp-65b is one of only a handful of planets with masses of ∼1.5 MJ, a mass regime surprisingly underrepresented among the currently known hot Jupiters. The radius of Wasp-75b is slightly inflated (10%) as compared to theoretical planet models with no core, and has a density similar to that of Saturn (ρpl = 0.52 ± 0.06 ρJ).
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Rossiter-McLaughlin Effect Measurements for Wasp-16, Wasp-25 and Wasp-31
Monthly Notices of the Royal Astronomical Society, 2012Co-Authors: D. J. A. Brown, David R. Anderson, A. Collier Cameron, Coel Hellier, Pierre F. L. Maxted, Don Pollacco, B. Enoch, Grant Miller, Didier Queloz, E. K. SimpsonAbstract:We present new measurements of the Rossiter-McLaughlin (RM) effect for three Wasp planetary systems, Wasp-16, Wasp-25 and Wasp-31, from a combined analysis of their complete sets of photometric and spectroscopic data. We find a low amplitude RM effect for Wasp-16 (Teff = 5700 \pm 150K), suggesting that the star is a slow rotator and thus of an advanced age, and obtain a projected alignment angle of lambda = -4.2 degrees +11.0 -13.9. For Wasp-25 (Teff = 5750\pm100K) we detect a projected spin-orbit angle of lambda = 14.6 degrees \pm6.7. Wasp-31 (Teff = 6300\pm100K) is found to be well-aligned, with a projected spin-orbit angle of lambda = 2.8degrees \pm3.1. A circular orbit is consistent with the data for all three systems, in agreement with their respective discovery papers. We consider the results for these systems in the context of the ensemble of RM measurements made to date. We find that whilst Wasp-16 fits the hypothesis of Winn et al. (2010) that 'cool' stars (Teff < 6250K) are preferentially aligned, Wasp-31 has little impact on the proposed trend. We bring the total distribution of the true spin-orbit alignment angle, psi, up to date, noting that recent results have improved the agreement with the theory of Fabrycky & Tremaine (2007) at mid-range angles. We also suggest a new test for judging misalignment using the Bayesian Information Criterion, according to which Wasp-25 b's orbit should be considered to be aligned.
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The discovery of Wasp-134b, Wasp-134c, Wasp-137b, Wasp-143b and Wasp-146b: three hot Jupiters and a pair of warm Jupiters orbiting Solar-type stars
arXiv: Earth and Planetary Astrophysics, 2018Co-Authors: David R. Anderson, Laetitia Delrez, A. Collier Cameron, Michaël Gillon, Coel Hellier, Emmanuel Jehin, F. Bouchy, David A. Brown, J. I. González Hernández, Monika LendlAbstract:We report the discovery by Wasp of five planets orbiting moderately bright ($V$ = 11.0-12.9) Solar-type stars. Wasp-137b, Wasp-143b and Wasp-146b are typical hot Jupiters in orbits of 3-4 d and with masses in the range 0.68--1.11 $M_{\rm Jup}$. Wasp-134 is a metal-rich ([Fe/H] = +0.40 $\pm$ 0.07]) G4 star orbited by two warm Jupiters: Wasp-134b ($M_{\rm pl}$ = 1.41 $M_{\rm Jup}$; $P = 10.1$ d; $e = 0.15 \pm 0.01$; $T_{\rm eql}$ = 950 K) and Wasp-134c ($M_{\rm pl} \sin i$ = 0.70 $M_{\rm Jup}$; $P = 70.0$ d; $e = 0.17 \pm 0.09$; $T_{\rm eql}$ = 500 K). From observations of the Rossiter-McLaughlin effect of Wasp-134b, we find its orbit to be misaligned with the spin of its star ($\lambda = -44 \pm 10^\circ$). Wasp-134 is a rare example of a system with a short-period giant planet and a nearby giant companion. In-situ formation or disc migration seem more likely explanations for such systems than does high-eccentricity migration.
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Wasp-120 b, Wasp-122 b, AND Wasp-123 b: Three Newly Discovered Planets from the Wasp-South Survey
Publications of the Astronomical Society of the Pacific, 2016Co-Authors: O. D. Turner, David R. Anderson, Laetitia Delrez, A. Collier Cameron, Daniel F. Evans, Michaël Gillon, Coel Hellier, Emmanuel Jehin, Monika Lendl, Pierre F. L. MaxtedAbstract:We present the discovery by the Wasp-South survey of three planets transiting moderately bright stars (V � 11). Wasp-120b is a massive (5.0MJup) planet in a 3.6-day orbit that we find likely to be eccentric (e = 0.059 +0.025 −0.018 ) around an F5 star. Wasp-122b is a hot-Jupiter (1.37MJup, 1.79RJup) in a 1.7-day orbit about a G4 star. Our predicted transit depth variation caused by the atmosphere of Wasp-122b suggests it is well suited to characterisation. Wasp-123b is a hot-Jupiter (0.92MJup, 1.33RJup) in a 3.0-day orbit around an old (� 7 Gyr) G5 star. Subject headings: Planetary systems — stars: individual (Wasp-120,Wasp-122,Wasp-123)
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Physical properties of the planetary systems Wasp-45 and Wasp-46 from simultaneous multiband photometry
Monthly Notices of the Royal Astronomical Society, 2015Co-Authors: Simona Ciceri, Monika Lendl, Luigi Mancini, John Southworth, J. Tregloan-reed, Rafael Brahm, Guo Chen, Giuseppe D'ago, Martin Dominik, R. Figuera JaimesAbstract:Accurate measurements of the physical characteristics of a large number of exoplanets are useful to strongly constrain theoretical models of planet formation and evolution, which lead to the large variety of exoplanets and planetary-system configurations that have been observed. We present a study of the planetary systems Wasp-45 and Wasp-46, both composed of a main-sequence star and a close-in hot Jupiter, based on 29 new high-quality light curves of transits events. In particular, one transit of Wasp-45 b and four of Wasp-46 b were simultaneously observed in four optical filters, while one transit of Wasp-46 b was observed with the NTT obtaining a precision of 0.30 mmag with a cadence of roughly 3 min. We also obtained five new spectra of Wasp-45 with the FEROS spectrograph. We improved by a factor of 4 the measurement of the radius of the planet Wasp-45 b, and found that Wasp-46 b is slightly less massive and smaller than previously reported. Both planets now have a more accurate measurement of the density (0.959 +/- 0.077 rho Jup instead of 0.64 +/- 0.30 rho Jup for Wasp-45 b, and 1.103 +/- 0.052 rho Jup instead of 0.94 +/- 0.11 rho Jup for Wasp-46 b). We tentatively detected radius variations with wavelength for both planets, in particular in the case of Wasp-45 b we found a slightly larger absorption in the redder bands than in the bluer ones. No hints for the presence of an additional planetary companion in the two systems were found either from the photometric or radial velocity measurements.
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Three Wasp-south transiting exoplanets : Wasp-74b, Wasp-83b, and Wasp-89b
The Astronomical Journal, 2015Co-Authors: Coel Hellier, David R. Anderson, Laetitia Delrez, A. Collier Cameron, Michaël Gillon, Emmanuel Jehin, Monika Lendl, Pierre F. L. Maxted, Francesco Pepe, Don PollaccoAbstract:We report the discovery of three new transiting hot Jupiters by Wasp-South together with the TRAPPIST photometer and the Euler/CORALIE spectrograph. Wasp-74b orbits a star of V = 9.7, making it one of the brighter systems accessible to Southern telescopes. It is a 0.95 MJup planet with a moderately bloated radius of 1.5 RJup in a 2-d orbit around a slightly evolved F9 star. Wasp-83b is a Saturn-mass planet at 0.3 MJup with a radius of 1.0 RJup. It is in a 5-d orbit around a fainter (V = 12.9) G8 star. Wasp-89b is a 6 MJup planet in a 3-d orbit with an eccentricity of e = 0.2. It is thus similar to massive, eccentric planets such as XO-3b and HAT-P-2b, except that those planets orbit F stars whereas Wasp-89 is a K star. The V = 13.1 host star is magnetically active, showing a rotation period of 20.2 d, while star spots are visible in the transits. There are indications that the planet’s orbit is aligned with the stellar spin. Wasp-89 is a good target for an extensive study of transits of star spots. Subject headings: planetary systems — stars: individual (Wasp-74, Wasp-83, Wasp-89)
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Three Wasp-South transiting exoplanets: Wasp-74b, Wasp-83b & Wasp-89b
arXiv: Earth and Planetary Astrophysics, 2014Co-Authors: Coel Hellier, David R. Anderson, A. Collier Cameron, Michaël Gillon, Monika Lendl, Pierre F. L. Maxted, L. Delrez, Francesco Pepe, E. Jehin, Don PollaccoAbstract:We report the discovery of three new transiting hot Jupiters by Wasp-South together with the TRAPPIST photometer and the Euler/CORALIE spectrograph. Wasp-74b orbits a star of V = 9.7, making it one of the brighter systems accessible to Southern telescopes. It is a 0.95 M_Jup planet with a moderately bloated radius of 1.5 R_Jup in a 2-d orbit around a slightly evolved F9 star. Wasp-83b is a Saturn-mass planet at 0.3 M_Jup with a radius of 1.0 R_Jup. It is in a 5-d orbit around a fainter (V = 12.9) G8 star. Wasp-89b is a 6 M_Jup planet in a 3-d orbit with an eccentricity of e = 0.2. It is thus similar to massive, eccentric planets such as XO-3b and HAT-P-2b, except that those planets orbit F stars whereas Wasp-89 is a K star. The V = 13.1 host star is magnetically active, showing a rotation period of 20.2 d, while star spots are visible in the transits. There are indications that the planet's orbit is aligned with the stellar spin. Wasp-89 is a good target for an extensive study of transits of star spots.
