Precision Speckle Pattern Reconstruction for High-contrast Imaging
In high-contrast imaging, a large instrumental, technological, and algorithmic effort is made to reduce residual speckle noise and improve the detection capabilities. In this work, we explore the potential of using a precise physical description of speckle images, in conjunction with the optimal det...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2024-01-01
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| Series: | The Astronomical Journal |
| Subjects: | |
| Online Access: | https://doi.org/10.3847/1538-3881/ad0b6f |
| _version_ | 1797359500108234752 |
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| author | Dotan Gazith Barak Zackay |
| author_facet | Dotan Gazith Barak Zackay |
| author_sort | Dotan Gazith |
| collection | DOAJ |
| description | In high-contrast imaging, a large instrumental, technological, and algorithmic effort is made to reduce residual speckle noise and improve the detection capabilities. In this work, we explore the potential of using a precise physical description of speckle images, in conjunction with the optimal detection statistic to perform high-contrast imaging. Our method uses short-exposure speckle images, reconstructing the point-spread function (PSF) of each image with phase retrieval algorithms. Using the reconstructed PSFs, we calculate the optimal detection statistic for all images. We analyze the arising bias due to the use of a reconstructed PSF and correct for it completely up to its accumulation over 10 ^4 images. We measure in simulations the method’s sensitivity loss due to overfitting in the reconstruction process and get to an estimated 5 σ detection limit of 5 × 10 ^−7 flux ratio at angular separations of 0.″1–0.″5 for a 1 h observation of Sirius A with a 2 m telescope. |
| first_indexed | 2024-03-08T15:25:41Z |
| format | Article |
| id | doaj.art-983721a1d99f4c50b17f213ccbca0a0c |
| institution | Directory Open Access Journal |
| issn | 1538-3881 |
| language | English |
| last_indexed | 2024-03-08T15:25:41Z |
| publishDate | 2024-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astronomical Journal |
| spelling | doaj.art-983721a1d99f4c50b17f213ccbca0a0c2024-01-10T10:04:26ZengIOP PublishingThe Astronomical Journal1538-38812024-01-0116725310.3847/1538-3881/ad0b6fPrecision Speckle Pattern Reconstruction for High-contrast ImagingDotan Gazith0https://orcid.org/0000-0001-6698-3693Barak Zackay1https://orcid.org/0000-0001-5162-9501Dept. of Particle Phys. & Astrophys., Weizmann Institute of Science , Rehovot 76100, IsraelDept. of Particle Phys. & Astrophys., Weizmann Institute of Science , Rehovot 76100, IsraelIn high-contrast imaging, a large instrumental, technological, and algorithmic effort is made to reduce residual speckle noise and improve the detection capabilities. In this work, we explore the potential of using a precise physical description of speckle images, in conjunction with the optimal detection statistic to perform high-contrast imaging. Our method uses short-exposure speckle images, reconstructing the point-spread function (PSF) of each image with phase retrieval algorithms. Using the reconstructed PSFs, we calculate the optimal detection statistic for all images. We analyze the arising bias due to the use of a reconstructed PSF and correct for it completely up to its accumulation over 10 ^4 images. We measure in simulations the method’s sensitivity loss due to overfitting in the reconstruction process and get to an estimated 5 σ detection limit of 5 × 10 ^−7 flux ratio at angular separations of 0.″1–0.″5 for a 1 h observation of Sirius A with a 2 m telescope.https://doi.org/10.3847/1538-3881/ad0b6fHigh contrast techniquesAstronomical seeingAstronomy data analysis |
| spellingShingle | Dotan Gazith Barak Zackay Precision Speckle Pattern Reconstruction for High-contrast Imaging The Astronomical Journal High contrast techniques Astronomical seeing Astronomy data analysis |
| title | Precision Speckle Pattern Reconstruction for High-contrast Imaging |
| title_full | Precision Speckle Pattern Reconstruction for High-contrast Imaging |
| title_fullStr | Precision Speckle Pattern Reconstruction for High-contrast Imaging |
| title_full_unstemmed | Precision Speckle Pattern Reconstruction for High-contrast Imaging |
| title_short | Precision Speckle Pattern Reconstruction for High-contrast Imaging |
| title_sort | precision speckle pattern reconstruction for high contrast imaging |
| topic | High contrast techniques Astronomical seeing Astronomy data analysis |
| url | https://doi.org/10.3847/1538-3881/ad0b6f |
| work_keys_str_mv | AT dotangazith precisionspecklepatternreconstructionforhighcontrastimaging AT barakzackay precisionspecklepatternreconstructionforhighcontrastimaging |