Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009sitc.conf.2005a&link_type=abstract
SPICA joint European/Japanese Workshop, held 6-8 July, 2009 at Oxford, United Kingdom. Edited by A.M. Heras, B.M. Swinyard, K.G
Astronomy and Astrophysics
Astronomy
Stars: Formation, Missions: Spica
Scientific paper
SPICA coronagraph will be operating from 3.5 to 27 micron and primarily aims at directly imaging extra-solar planets of nearby stars. A strong limitation of the coronagraph for the 3.5 m telescope is its angular resolution which allows planet detectability farther than a few AUs at best. Color Differential Astrometry (CDA) is a spectrophotometric method which would push the detection range to very close-in planets and up to a few AUs, thus nicely complementing the imaging coronagraph. We present the method and show how it can be implemented within the host coronagraph without ma jor impacts on its optical setup. We give preliminary estimates of its sensitivity according to different extra-solar planetary systems configurations. Critical instrumental requirements are discussed, especially regarding detector gain stability.
Abe Lyu
Enya Keigo
Kataza Hirokazu
Petrov Romain
Vannier Martin
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