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http://hdl.handle.net/20.500.12386/28191
Title: | Fast cadence speckle-free high-contrast imaging: SFADI and SFI | Authors: | LI CAUSI, Gianluca STANGALINI, MARCO ANTONIUCCI, Simone PEDICHINI, Fernando MATTIOLI, Massimiliano TESTA, Vincenzo PIAZZESI, ROBERTO |
Issue Date: | 2018 | Volume: | Adaptive Optics Systems VI | Editors: | Close, Laird M.; Schreiber, Laura; Schmidt, Dirk | Series: | PROCEEDINGS OF SPIE | Number: | 10703 | First Page: | 107032U | Abstract: | We present the research and developement status of the Speckle-Free Angular Differential Imaging method (SFADI), that we developed for the SHARK-VIS high-contrast imager for the LBT telescope. The technique bases on the acquisition of kHz frame-rate image sequences, which we combine in post-processing after speckle identification and suppression in each frame. With respect to the standard angular differential imaging, this method reaches a much smoother residual background and hence higher detection contrast at a given signal-to-noise ratio. Furthermore, it can reveal faint extended sources around bright central stars, and can use de-rotated images as well as quick second-lasting sequences. We reached a contrast of around 1e-5 for integration times of the order of tens of minutes at 100 mas for a 5.7 magnitude star, as we demonstrated on both a real-sky acquisition and at the SHARK-VIS laboratory test bench. Such long sequences though produces a large amount of data (around a million frames every 15 minutes) that we manage to processed in a reasonable computation time with the described implementation scheme. | Conference Name: | Adaptive Optics Systems VI | Conference Place: | Austin, Texas, United States | Conference Date: | 10-15 June, 2018 | URI: | http://hdl.handle.net/20.500.12386/28191 | ISSN: | 0277-786X | ISBN: | 9781510619593 9781510619609 |
DOI: | 10.1117/12.2312614 | Bibcode ADS: | 2018SPIE10703E..2UL | Fulltext: | open |
Appears in Collections: | 3.01 Contributi in Atti di convegno |
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SPIE107032U.pdf | Pdf editoriale | 1.51 MB | Adobe PDF | View/Open |
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