Share Email Print
cover

Proceedings Paper • new

Fast cadence speckle-free high-contrast imaging: SFADI and SFI
Author(s): G. Li Causi; M. Stangalini; S. Antoniucci; F. Pedichini; M. Mattioli; V. Testa; R. Piazzesi
Format Member Price Non-Member Price
PDF $14.40 $18.00

Paper Abstract

We present the R and D 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 10-5 for integration times of the order of tens of minutes at 100 mas for a 5.7th 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.

Paper Details

Date Published: 10 July 2018
PDF: 14 pages
Proc. SPIE 10703, Adaptive Optics Systems VI, 107032U (10 July 2018); doi: 10.1117/12.2312614
Show Author Affiliations
G. Li Causi, INAF - Istituto di Astrofisica e Planetologia Spaziali (Italy)
INAF - Osservatorio Astronomico di Roma (Italy)
ADONI Adaptive Optics National Lab. of Italy (Italy)
M. Stangalini, INAF - Osservatorio Astronomico di Roma (Italy)
ADONI - Lab. Nazionale di Ottica Adattiva (Italy)
S. Antoniucci, INAF - Osservatorio Astronomico di Roma (Italy)
ADONI - Lab. Nazionale di Ottica Adattiva (Italy)
F. Pedichini, INAF - Osservatorio Astronomico di Roma (Italy)
ADONI - Lab. Nazionale di Ottica Adattiva (Italy)
M. Mattioli, INAF - Osservatorio Astronomico di Roma (Italy)
V. Testa, INAF - Osservatorio Astronomico di Roma (Italy)
R. Piazzesi, INAF - Osservatorio Astronomico di Roma (Italy)


Published in SPIE Proceedings Vol. 10703:
Adaptive Optics Systems VI
Laird M. Close; Laura Schreiber; Dirk Schmidt, Editor(s)

© SPIE. Terms of Use
Back to Top