Japan Geoscience Union Meeting 2016

Presentation information


Symbol P (Space and Planetary Sciences) » P-PS Planetary Sciences

[P-PS11] Planetary Sciences

Wed. May 25, 2016 5:15 PM - 6:30 PM Poster Hall (International Exhibition Hall HALL6)

Convener:*Keiko Hamano(Department of Earth and Planetary Science, Graduate School of Science, University of Tokyo), Shunichi Kamata(Creative Research Institution, Hokkaido University)

5:15 PM - 6:30 PM

[PPS11-P01] Development of Exoplanet database “ExoKyoto” aiming for inter-comparison with different criteria of Habitable zones

Yosuke Yamashiki1, Takaaki Ito3, Yuji Shimada3, Mariko Inazawa4, *Takanori Sasaki2, Osamu Nishiura4, Shota Notsu2, Hiroyuki Ishikawa5, Anna Suzuki6, Takahito Sakaue5, Yuuta Notsu2, Naoki Nakamura2, Kosuke Namekata5, Hiroaki Isobe1, Kazunari Shibata2, Saaya Shimozaki7, Shione Fujita7 (1.Graduate School of Advanced Integrated Studies in Human Survivability Kyoto University, 2.Graduate School of Science, Kyoto University, 3.Faculty of Agriculture, Kyoto University, 4.Faculty of Engineering, Kyoto University, 5.Faculty of Science, Kyoto University, 6.Graduate School of Science, Kyoto Sangyo University, 7.SGH Shiga Prefectural Moriyama High School)

Keywords:Exoplanet, Habitable Zone, SEAU

An integrated database of confirmed exoplanets, capable in comparing several different definition of Habitable Zone, is developed and launched as “ExoKyoto”, for the purpose of better comprehension of those existing celestial entities in different star system. The ExoKyoto core-module is written in C++ with definition of different classes as “ExoPlanet” and “HostStar” objects. The classification of Habitable zone for each host star is based on Kopparapu et al. (2013) as the reference cases, at the same time this database determine Solar Equivalent Astronomical Unit (SEAU) to promote easy comprehension of different star system equivalent to that of Solar System.
The database has inter-comparison module with existing exoplanet database as Exoplanet.eu, Open Exoplanet Catalogue, and NASA exoplanet archive, and updating module in order to secure commonly agreed value for each planet. Since most of exoplanets found by Kepler spacetelescope detected only by transit method does not confirmed their mass by radial velocity, a mass estimation module for most of Super-Earth sized planets is included developed based on the Larsen and Geoffrey (2014). Using this mass-assumption module, the portion of Super-Earth sized exoplanets (2-10 Mearth) become dominant (794 among 1988) compared with that of super jovian sized ones (>500 Mearth) (480 among 1988), being comparable to total jovian & super jovian planets (926), in which only 140 of those Super-Earth sized mass has confirmed by radial velocity. Throughout the comparison between habitable criteria by Kopparapu et al. (2013) and ours (SEAU), most of exoplanets orbiting around M type stars have different conditions each other. The potential impact of stellar flares on those exoplanets can be discussed using our database.
For outreach purpose, ExoKyoto possesses interface with GoogleSky for easy comprehension of those celestial bodies among stellar map.
Lauren M. W. and Geoffrey W. M. 2014. The mass-radius relation for 65 exoplanets smaller than 4 earth radii. The Astrophysical Journal Letters, 783:L6
Kopparapu R. K. et al. 2013. Habitable Zones Around Main-Sequence Stars: New Estimates. The Astrophysical Journal, 765:131