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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 3 CONTRIBUTI IN ATTI DI CONVEGNO (Proceedings)
  4. 3.01 Contributi in Atti di convegno
Please use this identifier to cite or link to this item: 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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