Japan Geoscience Union Meeting 2015

Presentation information

International Session (Oral)

Symbol B (Biogeosciences) » B-AO Astrobiology & the Origin of Life

[B-AO01] Astrobiology: Origins, Evolution, Distribution of Life

Thu. May 28, 2015 2:15 PM - 4:00 PM 105 (1F)

Convener:*Kensei Kobayashi(Department of Chemistry and Biotechnology, Faculty of Engineering, Yokohama National University), Akihiko Yamagishi(Tokyo University of Pharmacy and Life Science, Department of Molecular Biology), Masatoshi Ohishi(Astronomy Data Center, National Astronomical Observatory of Japan), Eiichi Tajika(Department of Complexity Science and Engineering, Graduate School of Frontier Sciences, The University of Tokyo), Takeshi Kakegawa(Graduate School of Science, Tohoku University), Shigeru Ida(Department of Earth and Planetary Science, Graduate School of Science and Technology, Tokyo Institute of Technology), Chair:Masatoshi Ohishi(Astronomy Data Center, National Astronomical Observatory of Japan), Motohide Tamura(The University of Tokyo, Graduate School of Science)

2:45 PM - 3:00 PM

[BAO01-08] Search for extrasolar Earth-like planes in the habitable zone using InfraRed Doppler and the Subaru

*Masashi OMIYA1 (1.National Astronomical Observatory of Japan)

Planetary systems around low-mass stars are attractive targets to search for Earth-mass planets in the habitable zone because Doppler signals caused by the planets are relatively large and the habitable zone of the low-mass stars is located at close-in orbits. For the advantages, we have a plan to conduct a planet search program of low-mass stars by the Doppler method using a new InfraRed Doppler (IRD) instrument to search for Earth-like planets. IRD to be mounted on the Subaru telescope in 2015 is composed of a very stable near-infrared high dispersion echelle spectrograph and a laser-frequency comb as a wavelength calibrator of the radial velocity measurements. The main goals of the program are to detect Earth-mass planets in the habitable zone and to understand statistical properties, formation and habitability of extrasolar Earth-mass planets around low-mass stars.

We performed a survey simulation of our planet search program using IRD and the Subaru telescope and estimate expected numbers of detectable planets around low-mass stars based on the results of theoretical population synthesis. In this simulation, we expect more than 50 planets including the more than 30 Earth-mass planets and 10 Earth-mass planets in the habitable zone on a suitable survey plan. And we would detect some transiting planets in the habitable zone, which can characterize planetary atmosphere and may discuss the habitability of the planets by making follow-up observations.