The Experts below are selected from a list of 168 Experts worldwide ranked by ideXlab platform
Y F Huang - One of the best experts on this subject based on the ideXlab platform.
-
repeating fast radio bursts from highly magnetized pulsars traveling through Asteroid Belts
The Astrophysical Journal, 2016Co-Authors: Z G Dai, Jieshuang Wang, Y F HuangAbstract:Very recently, Spitler et al. and Scholz et al. reported their detections of 16 additional bright bursts in the direction of the fast radio burst (FRB) 121102. This repeating FRB is inconsistent with all of the catastrophic event models put forward previously for hypothetically non-repeating FRBs. Here, we propose a different model, in which highly magnetized pulsars travel through the Asteroid Belts of other stars. We show that a repeating FRB could originate from such a pulsar encountering a large number of Asteroids in the belt. During each pulsar-Asteroid impact, an electric field induced outside of the Asteroid has such a large component parallel to the stellar magnetic field that electrons are torn off the Asteroidal surface and accelerated to ultra-relativistic energies instantaneously. The subsequent movement of these electrons along magnetic field lines will cause coherent curvature radiation, which can account for all of the properties of an FRB. In addition, this model can self-consistently explain the typical duration, luminosity, and repetitive rate of the 17 bursts of FRB 121102. The predicted occurrence rate of repeating FRB sources may imply that our model would be testable in the next few years.
-
repeating fast radio bursts from highly magnetized pulsars travelling through Asteroid Belts
arXiv: High Energy Astrophysical Phenomena, 2016Co-Authors: Z G Dai, Jing Wang, Y F HuangAbstract:Very recently Spitler et al. (2016) and Scholz et al. (2016) reported their detections of sixteen additional bright bursts from the direction of the fast radio burst (FRB) 121102. This repeating FRB is inconsistent with all the catastrophic event models put forward previously for hypothetically non-repeating FRBs. Here we propose a different model, in which highly magnetized pulsars travel through Asteroid Belts of other stars. We show that a repeating FRB could originate from such a pulsar encountering lots of Asteroids in the belt. During each pulsar-Asteroid impact, an electric field induced outside the Asteroid has such a large component parallel to the stellar magnetic field that electrons are torn off the Asteroidal surface and accelerated to ultra-relativistic energies instantaneously. Subsequent movement of these electrons along magnetic field lines will cause coherent curvature radiation, which can account for all the properties of an FRB. In addition, this model can self-consistently explain the typical duration, luminosity, and repetitive rate of the seventeen bursts of FRB 121102. The predicted occurrence rate of repeating FRB sources may imply that our model would be testable in the next few years.
Z G Dai - One of the best experts on this subject based on the ideXlab platform.
-
repeating fast radio bursts from highly magnetized pulsars traveling through Asteroid Belts
The Astrophysical Journal, 2016Co-Authors: Z G Dai, Jieshuang Wang, Y F HuangAbstract:Very recently, Spitler et al. and Scholz et al. reported their detections of 16 additional bright bursts in the direction of the fast radio burst (FRB) 121102. This repeating FRB is inconsistent with all of the catastrophic event models put forward previously for hypothetically non-repeating FRBs. Here, we propose a different model, in which highly magnetized pulsars travel through the Asteroid Belts of other stars. We show that a repeating FRB could originate from such a pulsar encountering a large number of Asteroids in the belt. During each pulsar-Asteroid impact, an electric field induced outside of the Asteroid has such a large component parallel to the stellar magnetic field that electrons are torn off the Asteroidal surface and accelerated to ultra-relativistic energies instantaneously. The subsequent movement of these electrons along magnetic field lines will cause coherent curvature radiation, which can account for all of the properties of an FRB. In addition, this model can self-consistently explain the typical duration, luminosity, and repetitive rate of the 17 bursts of FRB 121102. The predicted occurrence rate of repeating FRB sources may imply that our model would be testable in the next few years.
-
repeating fast radio bursts from highly magnetized pulsars travelling through Asteroid Belts
arXiv: High Energy Astrophysical Phenomena, 2016Co-Authors: Z G Dai, Jing Wang, Y F HuangAbstract:Very recently Spitler et al. (2016) and Scholz et al. (2016) reported their detections of sixteen additional bright bursts from the direction of the fast radio burst (FRB) 121102. This repeating FRB is inconsistent with all the catastrophic event models put forward previously for hypothetically non-repeating FRBs. Here we propose a different model, in which highly magnetized pulsars travel through Asteroid Belts of other stars. We show that a repeating FRB could originate from such a pulsar encountering lots of Asteroids in the belt. During each pulsar-Asteroid impact, an electric field induced outside the Asteroid has such a large component parallel to the stellar magnetic field that electrons are torn off the Asteroidal surface and accelerated to ultra-relativistic energies instantaneously. Subsequent movement of these electrons along magnetic field lines will cause coherent curvature radiation, which can account for all the properties of an FRB. In addition, this model can self-consistently explain the typical duration, luminosity, and repetitive rate of the seventeen bursts of FRB 121102. The predicted occurrence rate of repeating FRB sources may imply that our model would be testable in the next few years.
Alexander V. Krivov - One of the best experts on this subject based on the ideXlab platform.
-
Does warm debris dust stem from Asteroid Belts
Monthly Notices of the Royal Astronomical Society, 2017Co-Authors: Fabian Geiler, Alexander V. KrivovAbstract:Many debris discs reveal a two-component structure, with a cold outer and a warm inner component. While the former are likely massive analogues of the Kuiper belt, the origin of the latter is still a matter of debate. In this work we investigate whether the warm dust may be a signature of Asteroid belt analogues. In the scenario tested here the current two-belt architecture stems from an originally extended protoplanetary disc, in which planets have opened a gap separating it into the outer and inner discs which, after the gas dispersal, experience a steady-state collisional decay. This idea is explored with an analytic collisional evolution model for a sample of 225 debris discs from a Spitzer/IRS catalogue that are likely to possess a two-component structure. We find that the vast majority of systems (220 out of 225, or 98%) are compatible with this scenario. For their progenitors, original protoplanetary discs, we find an average surface density slope of $-0.93\pm0.06$ and an average initial mass of $\left(3.3^{+0.4}_{-0.3}\right)\times 10^{-3}$ solar masses, both of which are in agreement with the values inferred from submillimetre surveys. However, dust production by short-period comets and - more rarely - inward transport from the outer Belts may be viable, and not mutually excluding, alternatives to the Asteroid belt scenario. The remaining five discs (2% of the sample: HIP 11486, HIP 23497, HIP 57971, HIP 85790, HIP 89770) harbour inner components that appear inconsistent with dust production in an "Asteroid belt." Warm dust in these systems must either be replenished from cometary sources or represent an aftermath of a recent rare event, such as a major collision or planetary system instability.
Rebecca G. Martin - One of the best experts on this subject based on the ideXlab platform.
-
Asteroid belt survival through stellar evolution: dependence on the stellar mass
Monthly Notices of the Royal Astronomical Society: Letters, 2020Co-Authors: Rebecca G. Martin, Mario Livio, Jeremy L. Smallwood, Cheng ChenAbstract:Polluted white dwarfs are generally accreting terrestrial-like material that may originate from a debris belt like the Asteroid belt in the solar system. The fraction of white dwarfs that are polluted drops off significantly for white dwarfs with masses $M_{\rm WD}\gtrsim 0.8\,\rm M_\odot$. This implies that Asteroid Belts and planetary systems around main-sequence stars with mass $M_{\rm MS}\gtrsim 3\,\rm M_\odot$ may not form because of the intense radiation from the star. This is in agreement with current debris disc and exoplanet observations. The fraction of white dwarfs that show pollution also drops off significantly for low mass white dwarfs $(M_{\rm WD}\lesssim 0.55\,\rm M_\odot)$. However, the low-mass white dwarfs that do show pollution are not currently accreting but have accreted in the past. We suggest that Asteroid Belts around main sequence stars with masses $M_{\rm MS}\lesssim 2\,\rm M_\odot$ are not likely to survive the stellar evolution process. The destruction likely occurs during the AGB phase and could be the result of interactions of the Asteroids with the stellar wind, the high radiation or, for the lowest mass stars that have an unusually close-in Asteroid belt, scattering during the tidal orbital decay of the inner planetary system.
-
On the formation and evolution of Asteroid Belts and their potential significance for life
Monthly Notices of the Royal Astronomical Society: Letters, 2012Co-Authors: Rebecca G. Martin, Mario LivioAbstract:Suggestions have been made that Asteroid Belts may be important both for the existence of life and perhaps even for the evolution of complex life on a planet. Using numerical models for protoplanetary discs, we calculate the location of the snow line, and we propose that Asteroid Belts are most likely to form in its vicinity. We then show that observations of warm dust in exosolar systems, thought to be produced by collisions between Asteroids in a belt, indicate that Asteroid Belts (when they exist) indeed coincide with the radial location and the temperature of the snow line. Giant planets form outside the snow line and prevent planet formation just inside of their orbit, creating an Asteroid belt there. However, the migration of giant planets through the Asteroid belt likely disperses the compact formation. We examine existing observations of giant exoplanets and find that less than 4 per cent are at radial locations outside of the snow line. This definitely may be the consequence of observational selection effects. However, with this caveat in mind, we point out that the dearth of giant planets outside the snow line may also suggest that compact Asteroid Belts are not common, and more speculatively that complex life may not be expected in most of the currently observed systems.
Jieshuang Wang - One of the best experts on this subject based on the ideXlab platform.
-
repeating fast radio bursts from highly magnetized pulsars traveling through Asteroid Belts
The Astrophysical Journal, 2016Co-Authors: Z G Dai, Jieshuang Wang, Y F HuangAbstract:Very recently, Spitler et al. and Scholz et al. reported their detections of 16 additional bright bursts in the direction of the fast radio burst (FRB) 121102. This repeating FRB is inconsistent with all of the catastrophic event models put forward previously for hypothetically non-repeating FRBs. Here, we propose a different model, in which highly magnetized pulsars travel through the Asteroid Belts of other stars. We show that a repeating FRB could originate from such a pulsar encountering a large number of Asteroids in the belt. During each pulsar-Asteroid impact, an electric field induced outside of the Asteroid has such a large component parallel to the stellar magnetic field that electrons are torn off the Asteroidal surface and accelerated to ultra-relativistic energies instantaneously. The subsequent movement of these electrons along magnetic field lines will cause coherent curvature radiation, which can account for all of the properties of an FRB. In addition, this model can self-consistently explain the typical duration, luminosity, and repetitive rate of the 17 bursts of FRB 121102. The predicted occurrence rate of repeating FRB sources may imply that our model would be testable in the next few years.
