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Proceedings Paper

Second-Earth imager for TMT (SEIT): concept and its numerical simulation
Author(s): Taro Matsuo; Takayuki Kotani; Naoshi Murakami; Hajime Kawahara; Yuka Fujii; Shin Oya; Mikio Kurita; Noriaki Natsume; Norio Narita; Kenji Takizawa; Masahiro Ikoma; Jun Minagawa; Naoshi Baba; Motohide Tamura
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Paper Abstract

Thirty Meter Telescope (TMT) will see the first light in 2019. We propose Second-Earth Imager for TMT (SEIT) as a future instrument of TMT. The central science case of SEIT is direct imaging and characterization of habitable planets around nearby late-type stars. Focusing on simultaneous spectroscopy of the central star and the planet, SEIT allows us to remove an impact from the telluric absorption and then reveal the presence of oxygen molecules on the Earth-like planets. In order to achieve such a science goal, an extreme AO, a coronagraph, and a post-process technique for achieving high contrast at the small inner working angle are key components. The combination of a shearing nulling interferometer and a pupil remapping interferometer is applied to the first SEIT concept. The shearing nulling interferometer suppresses the diffracted starlight after the extreme AO wavefront correction, and then the pupil remapping interferometer tackles the speckle noise from starlight. Focusing on a fact that the pupil remapping interferometer has difficulty reconstructing the wavefront from only the speckle noise, we found an unbalnced nulling technique enhances the performance of the pupil remapping interferometer. We performed a numerical simulation to validate this concept and found this concept achieves the 5-sigma detection contrast down to 8x10-8 at 10 mas for 5 hours. Thus, the SEIT concept detects habitable planets with a radius two times that of the Earth around ten nearby M stars.

Paper Details

Date Published: 24 September 2012
PDF: 8 pages
Proc. SPIE 8446, Ground-based and Airborne Instrumentation for Astronomy IV, 84461K (24 September 2012); doi: 10.1117/12.926039
Show Author Affiliations
Taro Matsuo, Kyoto Univ. (Japan)
Takayuki Kotani, National Astronomical Observatory of Japan (Japan)
Naoshi Murakami, Hokkaido Univ. (Japan)
Hajime Kawahara, Tokyo Metropolitan Univ. (Japan)
Yuka Fujii, The Univ. of Tokyo (Japan)
Shin Oya, Subaru Telescope, National Astronomical Observatory of Japan (United States)
Mikio Kurita, Kyoto Univ. (Japan)
Noriaki Natsume, Kyoto Univ. (Japan)
Norio Narita, National Astronomical Observatory of Japan (Japan)
Kenji Takizawa, National Institute for Basic Biology (Japan)
Masahiro Ikoma, The Univ. of Tokyo (Japan)
Jun Minagawa, National Institute for Basic Biology (Japan)
Naoshi Baba, Hokkaido Univ. (Japan)
Motohide Tamura, National Astronomical Observatory of Japan (Japan)


Published in SPIE Proceedings Vol. 8446:
Ground-based and Airborne Instrumentation for Astronomy IV
Ian S. McLean; Suzanne K. Ramsay; Hideki Takami, Editor(s)

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