SPICA infrared coronagraph for the direct observation of exo-planets

摘要: Abstract We present a mid-infrared coronagraph to target the direct observation of extrasolar planets, for Space Infrared telescope Cosmology and Astrophysics (SPICA). SPICA is proposed JAXA–ESA mission, which will carry cooled 5 K with 3.5 m diameter aperture, planned be launched in 2018 by an H II family rocket. The mission gives us unique opportunity high-contrast observations because large simple pupil shape, capability infrared from space. have commenced studies SPICA, this currently regarded as option focal plane instruments. primary Jovian exo-planets. A strategy baseline survey specifications instrument are introduced together. main wavelengths contrast required 3.5–27 μm, 10 −6 , respectively. Laboratory experiments were performed visible laser demonstrate principles coronagraphs. In experiment using binary-shaped coronagraphs, 6.7 × 10 −8 was achieved, derived linear average dark region core point spread function (PSF). mask solution its feasibility robustness. On other hand, laboratory phase induced amplitude apodization/binary-mask hybrid has been executed obtain higher performance (i.e., smaller inner working angle throughput), 6.5 × 10 −7 achieved active wavefront control. Potentially important by-product instrument, transit monitoring characterization exo-planets, also described. recent progress technology on design actual PSF subtraction, development free-standing binary masks, vacuum chamber, cryogenic deformable mirror. Considering essential platform coronagraphs key technologies, we propose develop perform exo-planets it.