Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sf2a.conf...81v&link_type=abstract
"SF2A-2008: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics Eds.: C. Charbonnel, F. Combes
Astronomy and Astrophysics
Astrophysics
Scientific paper
Extrasolar planets observation and characterization with high contrast imaging instruments will be a very important subject for observational astronomy in the coming decade. Dedicated new instruments are being developed in order to achieve this goal with very high performance. In particular, full spectroscopic characterization of low temperature planetary companions is an extremely important milestone. We present a new data analysis method for long slit spectroscopy (LSS) with coronagraphy which allows characterization of planetary companions with low effective temperature. In a speckle-limited regime, the method allows an accurate estimation and subtraction of the scattered starlight, in order to extract a clean spectrum of the planetary companion. This method was developed in the context of SPHERE (Dohlen et al. 2006), a second generation instrument for the VLT, that will offer several observing modes for detection and characterization of exoplanets in the near-infrared. Using this method we are able to achieve a contrast reduction of 0.5 to 2.0 magnitudes compared to the coronagraphic observations on simulated images, leading to the possible characterization of planetary companions with effective temperatures of 600 K and 900 K orbiting respectively around M0 and G0 stars at 10 pc, and for angular separations of 1.0 arcsec.
Langlois Maud
Moutou Claire
Vigan Arthur
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