Coronography study for hypertelescope

Details Coronography study for hypertelescope Coronography study for hypertelescope

Oct 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.514..267g&link_type=abstract

In: Earth-like planets and moons. Proceedings of the 36th ESLAB Symposium, 3 - 8 June 2002, ESTEC, Noordwijk, The Netherlands. E

Physics

Nulling Interferometers, Hypertelescopes, Coronagraphs, Exoplanets, Tpf

Scientific paper

Following the idea developed in (Boccaletti et al. 2000), a snapshot imaging interferometer is proposed as an alternative to the NASA Origin project: "Terrestrial Planet Finder". This concept is based on densified pupil imaging (Labeyrie 1996) and phase-mask coronagraphy by (Rouan et al. 2000). The so-called Four-Quadrant Phase-Mask features a large starlight attenuation (10-8). Thorough calculations indicate that the detection of Earth-like planets amidst zodiacal and exo-zodiacal clouds is faster with an imaging system than with a nulling interferometer as originally proposed for the TPF design. Detailed numerical simulations have been carried out taking into account several sources of noise and as a result we found that Earth-like planets can be imaged up to about 25 pc with a large interferometer in the thermal infrared. Finally this concept seems promising for discovering life hints with medium resolution spectra in both the visible (O2, CH4, H2O and Chlorophylla signature) and the thermal infrared (CH4, H2O, O3, CO2, NH3).

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