The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Colin Norman - One of the best experts on this subject based on the ideXlab platform.
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Active Correction of Aperture Discontinuities-Optimized Stroke Minimization. I. A New Adaptive Interaction Matrix Algorithm
Astronomical Journal, 2018Co-Authors: Johan Mazoyer, Kevin Fogarty, Neil Zimmerman, Lucie Leboulleux, K. St. Laurent, Laurent Pueyo, Remi Soummer, Stuart B. Shaklan, Mamadou N’diaye, Colin NormanAbstract:Future searches for bio-markers on habitable exoplanets will rely on telescope instruments that achieve extremely high contrast at small planet-to-star angular separations. Coronagraphy is a promising starlight suppression technique, providing excellent contrast and throughput for off-axis sources on clear Apertures. However, the complexity of space- and ground-based telescope Apertures goes on increasing over time, owing to the combination of primary mirror segmentation, the secondary mirror, and its support structures. These discontinuities in the telescope Aperture limit the coronagraph performance. In this paper, we present ACAD-OSM, a novel active method to correct for the diffractive effects of Aperture discontinuities in the final image plane of a coronagraph. Active methods use one or several deformable mirrors that are controlled with an interaction matrix to correct for the aberrations in the pupil. However, they are often limited by the amount of aberrations introduced by Aperture discontinuities. This algorithm relies on the recalibration of the interaction matrix during the correction process to overcome this limitation. We first describe the ACAD-OSM technique and compare it to the previous active methods for the correction of Aperture discontinuities. We then show its performance in terms of contrast and off-axis throughput for static Aperture discontinuities (segmentation, struts) and for some aberrations evolving over the life of the instrument (residual phase aberrations, artifacts in the Aperture, misalignments in the coronagraph design). This technique can now obtain the Earth-like planet detection threshold of 10^10 contrast on any given Aperture over at least a 10% spectral bandwidth, with several coronagraph designs.
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Active Correction of Aperture Discontinuities-Optimized Stroke Minimization. I. A New Adaptive Interaction Matrix Algorithm
The Astronomical Journal, 2017Co-Authors: Johan Mazoyer, Mamadou N'diaye, Kevin Fogarty, Neil Zimmerman, Lucie Leboulleux, K. St. Laurent, Laurent Pueyo, Remi Soummer, Stuart B. Shaklan, Colin NormanAbstract:Future searches for biomarkers on habitable exoplanets will rely on telescope instruments that achieve extremely high contrast at small planet-to-star angular separations. Coronagraphy is a promising starlight suppression technique, providing excellent contrast and throughput for off-axis sources on clear Apertures. However, the complexity of space- and ground-based telescope Apertures goes on increasing over time, owing to the combination of primary mirror segmentation, secondary mirror, and support structures. These discontinuities in the telescope Aperture limit the coronagraph performance. In this paper, we present ACAD-OSM, a novel active method to correct for the diffractive effects of Aperture discontinuities in the final image plane of a coronagraph. Active methods use one or several deformable mirrors that are controlled with an interaction matrix to correct for the aberrations in the pupil. However, they are often limited by the amount of aberrations introduced by Aperture discontinuities. This algorithm relies on the recalibration of the interaction matrix during the correction process to overcome this limitation. We first describe the ACAD-OSM technique and compare it to the previous active methods for the correction of Aperture discontinuities. We then show its performance in terms of contrast and off-axis throughput for static Aperture discontinuities (segmentation, struts) and for some aberrations evolving over the life of the instrument (residual phase aberrations, artifacts in the Aperture, misalignments in the coronagraph design). This technique can now obtain the earth-like planet detection threshold of 10^(-10) contrast on any given Aperture over at least a 10% spectral bandwidth, with several coronagraph designs.
Remi Soummer - One of the best experts on this subject based on the ideXlab platform.
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Active Correction of Aperture Discontinuities-Optimized Stroke Minimization. I. A New Adaptive Interaction Matrix Algorithm
Astronomical Journal, 2018Co-Authors: Johan Mazoyer, Kevin Fogarty, Neil Zimmerman, Lucie Leboulleux, K. St. Laurent, Laurent Pueyo, Remi Soummer, Stuart B. Shaklan, Mamadou N’diaye, Colin NormanAbstract:Future searches for bio-markers on habitable exoplanets will rely on telescope instruments that achieve extremely high contrast at small planet-to-star angular separations. Coronagraphy is a promising starlight suppression technique, providing excellent contrast and throughput for off-axis sources on clear Apertures. However, the complexity of space- and ground-based telescope Apertures goes on increasing over time, owing to the combination of primary mirror segmentation, the secondary mirror, and its support structures. These discontinuities in the telescope Aperture limit the coronagraph performance. In this paper, we present ACAD-OSM, a novel active method to correct for the diffractive effects of Aperture discontinuities in the final image plane of a coronagraph. Active methods use one or several deformable mirrors that are controlled with an interaction matrix to correct for the aberrations in the pupil. However, they are often limited by the amount of aberrations introduced by Aperture discontinuities. This algorithm relies on the recalibration of the interaction matrix during the correction process to overcome this limitation. We first describe the ACAD-OSM technique and compare it to the previous active methods for the correction of Aperture discontinuities. We then show its performance in terms of contrast and off-axis throughput for static Aperture discontinuities (segmentation, struts) and for some aberrations evolving over the life of the instrument (residual phase aberrations, artifacts in the Aperture, misalignments in the coronagraph design). This technique can now obtain the Earth-like planet detection threshold of 10^10 contrast on any given Aperture over at least a 10% spectral bandwidth, with several coronagraph designs.
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Active Correction of Aperture Discontinuities-Optimized Stroke Minimization. I. A New Adaptive Interaction Matrix Algorithm
The Astronomical Journal, 2017Co-Authors: Johan Mazoyer, Mamadou N'diaye, Kevin Fogarty, Neil Zimmerman, Lucie Leboulleux, K. St. Laurent, Laurent Pueyo, Remi Soummer, Stuart B. Shaklan, Colin NormanAbstract:Future searches for biomarkers on habitable exoplanets will rely on telescope instruments that achieve extremely high contrast at small planet-to-star angular separations. Coronagraphy is a promising starlight suppression technique, providing excellent contrast and throughput for off-axis sources on clear Apertures. However, the complexity of space- and ground-based telescope Apertures goes on increasing over time, owing to the combination of primary mirror segmentation, secondary mirror, and support structures. These discontinuities in the telescope Aperture limit the coronagraph performance. In this paper, we present ACAD-OSM, a novel active method to correct for the diffractive effects of Aperture discontinuities in the final image plane of a coronagraph. Active methods use one or several deformable mirrors that are controlled with an interaction matrix to correct for the aberrations in the pupil. However, they are often limited by the amount of aberrations introduced by Aperture discontinuities. This algorithm relies on the recalibration of the interaction matrix during the correction process to overcome this limitation. We first describe the ACAD-OSM technique and compare it to the previous active methods for the correction of Aperture discontinuities. We then show its performance in terms of contrast and off-axis throughput for static Aperture discontinuities (segmentation, struts) and for some aberrations evolving over the life of the instrument (residual phase aberrations, artifacts in the Aperture, misalignments in the coronagraph design). This technique can now obtain the earth-like planet detection threshold of 10^(-10) contrast on any given Aperture over at least a 10% spectral bandwidth, with several coronagraph designs.
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stellar coronagraphy with prolate apodized circular Apertures
Astronomy and Astrophysics, 2003Co-Authors: Remi Soummer, C Aime, Peter FalloonAbstract:This paper generalizes to circular Apertures the theoretical study of stellar coronagraphy with prolate apodized rectangular entrance Apertures of Aime et al. (2002). The main difference between the two studies is that circular prolate spheroidal functions are used for a circular Aperture instead of linear prolate spheroidal functions for rectangular Apertures. Owing to the radial property of the problem, the solution to the general equation for coronagraphy is solved using a Hankel transform instead of a product of Fourier transforms in the rectangular case. This new theoretical study permits a better understanding of coronagraphy, stressing the importance of entrance pupil apodization. A comparison with the classical unapodized Lyot technique is performed: a typical gain of 10 4 to 10 6 can be obtained theoretically with this technique. Circular and rectangular Apertures give overall comparable results: a total extinction of the star light is obtained for Roddier & Roddier's phase mask technique whilst optimal starlight rejections are obtained with a Lyot opaque mask. A precise comparison between a circular Aperture and a square Aperture of same surface favors the use of a circular Aperture for detection of extrasolar planets.
Johan Mazoyer - One of the best experts on this subject based on the ideXlab platform.
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Active Correction of Aperture Discontinuities-Optimized Stroke Minimization. I. A New Adaptive Interaction Matrix Algorithm
Astronomical Journal, 2018Co-Authors: Johan Mazoyer, Kevin Fogarty, Neil Zimmerman, Lucie Leboulleux, K. St. Laurent, Laurent Pueyo, Remi Soummer, Stuart B. Shaklan, Mamadou N’diaye, Colin NormanAbstract:Future searches for bio-markers on habitable exoplanets will rely on telescope instruments that achieve extremely high contrast at small planet-to-star angular separations. Coronagraphy is a promising starlight suppression technique, providing excellent contrast and throughput for off-axis sources on clear Apertures. However, the complexity of space- and ground-based telescope Apertures goes on increasing over time, owing to the combination of primary mirror segmentation, the secondary mirror, and its support structures. These discontinuities in the telescope Aperture limit the coronagraph performance. In this paper, we present ACAD-OSM, a novel active method to correct for the diffractive effects of Aperture discontinuities in the final image plane of a coronagraph. Active methods use one or several deformable mirrors that are controlled with an interaction matrix to correct for the aberrations in the pupil. However, they are often limited by the amount of aberrations introduced by Aperture discontinuities. This algorithm relies on the recalibration of the interaction matrix during the correction process to overcome this limitation. We first describe the ACAD-OSM technique and compare it to the previous active methods for the correction of Aperture discontinuities. We then show its performance in terms of contrast and off-axis throughput for static Aperture discontinuities (segmentation, struts) and for some aberrations evolving over the life of the instrument (residual phase aberrations, artifacts in the Aperture, misalignments in the coronagraph design). This technique can now obtain the Earth-like planet detection threshold of 10^10 contrast on any given Aperture over at least a 10% spectral bandwidth, with several coronagraph designs.
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Active Correction of Aperture Discontinuities-Optimized Stroke Minimization. I. A New Adaptive Interaction Matrix Algorithm
The Astronomical Journal, 2017Co-Authors: Johan Mazoyer, Mamadou N'diaye, Kevin Fogarty, Neil Zimmerman, Lucie Leboulleux, K. St. Laurent, Laurent Pueyo, Remi Soummer, Stuart B. Shaklan, Colin NormanAbstract:Future searches for biomarkers on habitable exoplanets will rely on telescope instruments that achieve extremely high contrast at small planet-to-star angular separations. Coronagraphy is a promising starlight suppression technique, providing excellent contrast and throughput for off-axis sources on clear Apertures. However, the complexity of space- and ground-based telescope Apertures goes on increasing over time, owing to the combination of primary mirror segmentation, secondary mirror, and support structures. These discontinuities in the telescope Aperture limit the coronagraph performance. In this paper, we present ACAD-OSM, a novel active method to correct for the diffractive effects of Aperture discontinuities in the final image plane of a coronagraph. Active methods use one or several deformable mirrors that are controlled with an interaction matrix to correct for the aberrations in the pupil. However, they are often limited by the amount of aberrations introduced by Aperture discontinuities. This algorithm relies on the recalibration of the interaction matrix during the correction process to overcome this limitation. We first describe the ACAD-OSM technique and compare it to the previous active methods for the correction of Aperture discontinuities. We then show its performance in terms of contrast and off-axis throughput for static Aperture discontinuities (segmentation, struts) and for some aberrations evolving over the life of the instrument (residual phase aberrations, artifacts in the Aperture, misalignments in the coronagraph design). This technique can now obtain the earth-like planet detection threshold of 10^(-10) contrast on any given Aperture over at least a 10% spectral bandwidth, with several coronagraph designs.
Stuart B. Shaklan - One of the best experts on this subject based on the ideXlab platform.
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Active Correction of Aperture Discontinuities-Optimized Stroke Minimization. I. A New Adaptive Interaction Matrix Algorithm
Astronomical Journal, 2018Co-Authors: Johan Mazoyer, Kevin Fogarty, Neil Zimmerman, Lucie Leboulleux, K. St. Laurent, Laurent Pueyo, Remi Soummer, Stuart B. Shaklan, Mamadou N’diaye, Colin NormanAbstract:Future searches for bio-markers on habitable exoplanets will rely on telescope instruments that achieve extremely high contrast at small planet-to-star angular separations. Coronagraphy is a promising starlight suppression technique, providing excellent contrast and throughput for off-axis sources on clear Apertures. However, the complexity of space- and ground-based telescope Apertures goes on increasing over time, owing to the combination of primary mirror segmentation, the secondary mirror, and its support structures. These discontinuities in the telescope Aperture limit the coronagraph performance. In this paper, we present ACAD-OSM, a novel active method to correct for the diffractive effects of Aperture discontinuities in the final image plane of a coronagraph. Active methods use one or several deformable mirrors that are controlled with an interaction matrix to correct for the aberrations in the pupil. However, they are often limited by the amount of aberrations introduced by Aperture discontinuities. This algorithm relies on the recalibration of the interaction matrix during the correction process to overcome this limitation. We first describe the ACAD-OSM technique and compare it to the previous active methods for the correction of Aperture discontinuities. We then show its performance in terms of contrast and off-axis throughput for static Aperture discontinuities (segmentation, struts) and for some aberrations evolving over the life of the instrument (residual phase aberrations, artifacts in the Aperture, misalignments in the coronagraph design). This technique can now obtain the Earth-like planet detection threshold of 10^10 contrast on any given Aperture over at least a 10% spectral bandwidth, with several coronagraph designs.
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Active Correction of Aperture Discontinuities-Optimized Stroke Minimization. I. A New Adaptive Interaction Matrix Algorithm
The Astronomical Journal, 2017Co-Authors: Johan Mazoyer, Mamadou N'diaye, Kevin Fogarty, Neil Zimmerman, Lucie Leboulleux, K. St. Laurent, Laurent Pueyo, Remi Soummer, Stuart B. Shaklan, Colin NormanAbstract:Future searches for biomarkers on habitable exoplanets will rely on telescope instruments that achieve extremely high contrast at small planet-to-star angular separations. Coronagraphy is a promising starlight suppression technique, providing excellent contrast and throughput for off-axis sources on clear Apertures. However, the complexity of space- and ground-based telescope Apertures goes on increasing over time, owing to the combination of primary mirror segmentation, secondary mirror, and support structures. These discontinuities in the telescope Aperture limit the coronagraph performance. In this paper, we present ACAD-OSM, a novel active method to correct for the diffractive effects of Aperture discontinuities in the final image plane of a coronagraph. Active methods use one or several deformable mirrors that are controlled with an interaction matrix to correct for the aberrations in the pupil. However, they are often limited by the amount of aberrations introduced by Aperture discontinuities. This algorithm relies on the recalibration of the interaction matrix during the correction process to overcome this limitation. We first describe the ACAD-OSM technique and compare it to the previous active methods for the correction of Aperture discontinuities. We then show its performance in terms of contrast and off-axis throughput for static Aperture discontinuities (segmentation, struts) and for some aberrations evolving over the life of the instrument (residual phase aberrations, artifacts in the Aperture, misalignments in the coronagraph design). This technique can now obtain the earth-like planet detection threshold of 10^(-10) contrast on any given Aperture over at least a 10% spectral bandwidth, with several coronagraph designs.
Kevin Fogarty - One of the best experts on this subject based on the ideXlab platform.
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Active Correction of Aperture Discontinuities-Optimized Stroke Minimization. I. A New Adaptive Interaction Matrix Algorithm
Astronomical Journal, 2018Co-Authors: Johan Mazoyer, Kevin Fogarty, Neil Zimmerman, Lucie Leboulleux, K. St. Laurent, Laurent Pueyo, Remi Soummer, Stuart B. Shaklan, Mamadou N’diaye, Colin NormanAbstract:Future searches for bio-markers on habitable exoplanets will rely on telescope instruments that achieve extremely high contrast at small planet-to-star angular separations. Coronagraphy is a promising starlight suppression technique, providing excellent contrast and throughput for off-axis sources on clear Apertures. However, the complexity of space- and ground-based telescope Apertures goes on increasing over time, owing to the combination of primary mirror segmentation, the secondary mirror, and its support structures. These discontinuities in the telescope Aperture limit the coronagraph performance. In this paper, we present ACAD-OSM, a novel active method to correct for the diffractive effects of Aperture discontinuities in the final image plane of a coronagraph. Active methods use one or several deformable mirrors that are controlled with an interaction matrix to correct for the aberrations in the pupil. However, they are often limited by the amount of aberrations introduced by Aperture discontinuities. This algorithm relies on the recalibration of the interaction matrix during the correction process to overcome this limitation. We first describe the ACAD-OSM technique and compare it to the previous active methods for the correction of Aperture discontinuities. We then show its performance in terms of contrast and off-axis throughput for static Aperture discontinuities (segmentation, struts) and for some aberrations evolving over the life of the instrument (residual phase aberrations, artifacts in the Aperture, misalignments in the coronagraph design). This technique can now obtain the Earth-like planet detection threshold of 10^10 contrast on any given Aperture over at least a 10% spectral bandwidth, with several coronagraph designs.
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Active Correction of Aperture Discontinuities-Optimized Stroke Minimization. I. A New Adaptive Interaction Matrix Algorithm
The Astronomical Journal, 2017Co-Authors: Johan Mazoyer, Mamadou N'diaye, Kevin Fogarty, Neil Zimmerman, Lucie Leboulleux, K. St. Laurent, Laurent Pueyo, Remi Soummer, Stuart B. Shaklan, Colin NormanAbstract:Future searches for biomarkers on habitable exoplanets will rely on telescope instruments that achieve extremely high contrast at small planet-to-star angular separations. Coronagraphy is a promising starlight suppression technique, providing excellent contrast and throughput for off-axis sources on clear Apertures. However, the complexity of space- and ground-based telescope Apertures goes on increasing over time, owing to the combination of primary mirror segmentation, secondary mirror, and support structures. These discontinuities in the telescope Aperture limit the coronagraph performance. In this paper, we present ACAD-OSM, a novel active method to correct for the diffractive effects of Aperture discontinuities in the final image plane of a coronagraph. Active methods use one or several deformable mirrors that are controlled with an interaction matrix to correct for the aberrations in the pupil. However, they are often limited by the amount of aberrations introduced by Aperture discontinuities. This algorithm relies on the recalibration of the interaction matrix during the correction process to overcome this limitation. We first describe the ACAD-OSM technique and compare it to the previous active methods for the correction of Aperture discontinuities. We then show its performance in terms of contrast and off-axis throughput for static Aperture discontinuities (segmentation, struts) and for some aberrations evolving over the life of the instrument (residual phase aberrations, artifacts in the Aperture, misalignments in the coronagraph design). This technique can now obtain the earth-like planet detection threshold of 10^(-10) contrast on any given Aperture over at least a 10% spectral bandwidth, with several coronagraph designs.
