Coronagraphic search for exo-planets with a hypertelescope. I. In the thermal IR

Details Coronagraphic search for exo-planets with a hypertelescope. I. In the thermal IR Coronagraphic search for exo-planets with a hypertelescope. I. In the thermal IR

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002a%26a...396..345r&link_type=abstract

Astronomy and Astrophysics, v.396, p.345-352 (2002)

Astronomy and Astrophysics

Astrophysics

13

Instrumentation: Interferometers, Techniques: High Angular Resolution, Methods: Numerical, Stars: Planetary Systems

Scientific paper

Following the idea developed in Boccaletti et al. (2000), a snapshot imaging interferometer is proposed as an alternative to the nulling interferometer for the NASA Origin project, ``Terrestrial Planet Finder". This concept is based on hypertelescope, i.e. densified-pupil, imaging (Labeyrie \cite{l96}) and phase-mask coronagraphy (Rouan et al. \cite{ro00}) to combine a very high angular resolution and a deep attenuation of starlight (10-8) as required to image extra-terrestrial planets. This article aims at presenting thorough estimations of the signal to noise ratio for different classes of stars (from F0V to M5V) and includes several sources of background noise (zodiacal and exozodiacal lights for instance). In addition, numerical simulations have been carried out and are compared to the analytical results. We find that the image of Earth-like planets can be formed with a large hypertelescope ( ~ 80 m) in the thermal infra-red for about 73% of the stars within 25pc. The Appendix is only available in electonic form at http://www.edpsciences.org

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