Utilizza questo identificativo per citare o creare un link a questo documento:
http://hdl.handle.net/20.500.12386/29907
Titolo: | The LBTI Fizeau imager - I. Fundamental gain in high-contrast imaging | Autori: | Patru, F. ESPOSITO, Simone PUGLISI, Alfio Timothy RICCARDI, Armando PINNA, Enrico ARCIDIACONO, CARMELO Antichi, J. Mennesson, B. Defrère, D. Hinz, P. M. Hill, J. M. |
Data pubblicazione: | 2017 | Rivista: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Numero: | 472 | Fascicolo: | 3 | Da pagina:: | 2544 | Abstract: | We show by numerical simulations a fundamental gain in contrast when combining coherently monochromatic light from two adaptive optics (AO) telescopes instead of using a single stand-alone AO telescope, assuming efficient control and acquisition systems at high speed. A contrast gain map is defined as the normalized point spread functions (PSFs) ratio of a single Large Binocular Telescope (LBT) aperture over the dual Large Binocular Telescope Interferometer (LBTI) aperture in Fizeau mode. The global gain averaged across the AO-corrected field of view is improved by a factor of 2 in contrast in long exposures and by a factor of 10 in contrast in short exposures (i.e. in exposures, respectively, longer or shorter than the coherence time). The fringed speckle halo in short exposures contains not only high-angular resolution information, as stated by speckle imaging and speckle interferometry, but also high-contrast imaging information. A high-gain zone is further produced in the valleys of the PSF formed by the dark Airy rings and/or the dark fringes. Earth rotation allows us to exploit various areas in the contrast gain map. A huge-contrast gain in narrow zones can be achieved when both a dark fringe and a dark ring overlap on to an exoplanet. Compared to a single 8-m LBT aperture, the 23-m LBTI Fizeau imager can provide a gain in sensitivity (by a factor of 4), a gain in angular resolution (by a factor of 3) and, as well, a gain in raw contrast (by a factor of 2-1000 varying over the AO-corrected field of view). | URI: | http://hdl.handle.net/20.500.12386/29907 | URL: | https://academic.oup.com/mnras/article/472/3/2544/4062199 | ISSN: | 0035-8711 | DOI: | 10.1093/mnras/stx1961 | Bibcode ADS: | 2017MNRAS.472.2544P | Fulltext: | open |
È visualizzato nelle collezioni: | 1.01 Articoli in rivista |
File in questo documento:
File | Descrizione | Dimensioni | Formato | |
---|---|---|---|---|
stx1961.pdf | PDF editoriale | 5.5 MB | Adobe PDF | Visualizza/apri |
Page view(s)
48
controllato il 25-apr-2024
Download(s)
15
controllato il 25-apr-2024
Google ScholarTM
Check
Altmetric
Altmetric
Tutti i documenti in DSpace sono pubblicati ad Accesso Aperto, salvo diversa indicazione per alcuni documenti specifici.