An integrated database of confirmed exoplanets, capable of comparing several different definitions of Habitable Zones, has been developed and launched as “ExoKyoto”, for the purpose of better comprehension of these existing celestial entities in different star systems. The ExoKyoto core-module is written in C++, with definitions of different classes as “ExoPlanet” and “HostStar” objects. The classification of Habitable zones for each host star is based on Kopparapu et al. (2013) as the reference cases with two different sets of coefficients. At the same time this database determines Solar Equivalent Astronomical Unit (SEAU), a Solar-normalized Astronomical Unit, to promote easy comprehension of different star systems equivalent to that of the Solar System.
The database has an inter-comparison module with existing exoplanet databases such as as Exoplanet.eu, Open Exoplanet Catalogue, and NASA exoplanet archive; and an updating module in order to secure commonly agreed values for each planet. Since most of the exoplanets found by Kepler space telescope, detected only by transit methods, do not confirm their mass by radial velocity, a mass estimation module for most of the Super-Earth sized planets is included and developed based on Larsen and Geoffrey (2014). Also, the database employs radius estimation modules for those planets detected only by radial velocity.
The HOSTSTAR module of the database includes not only host stars for confirmed expoplanets, but also hundreds of thousands of stars existing in the star database listed in (hyg database). Each hoststar can be referred to in the catalogue with its habitable zone calculated, based on the observed/estimated star parameters, with its image generated in the database. The potential impact of stellar flares on those exoplanets can be discussed using our database for some stars, as the flare-star list obtained by Kyoto University, blight transients and variable stars are included on the system.
For outreach and observation support purposes, ExoKyoto possesses Stellar Windows, developed by the Xlib & Ggd module, and interfaces with GoogleSky for easy comprehension of those celestial bodies on a stellar map.
Target stars can be identified and listed by using this database, based on the target magnitude, transit frequency, and photon decrease ratio by its transit,
Official distribution of the system will be scheduled in the beginning of September, however wish for everyone to use the system as users. For those who interested in using the system, please write to us at firstname.lastname@example.org with your name, affiliation and purpose.
*”ExoKyoto” Application of Exoplanet Database Development Members*
Yosuke Yamashiki (Graduate School of Advanced Integrated Studies in Human Survivability, Kyoto University)（Development Manager) Entire Module Design and C++ Code Writer
Natsuki Hosono (Graduate School of Advanced Integrated Studies in Human Survivability, Kyoto University) 3D Label Module Writer, Planet Orbit Module Developer
Ryusuke Kuroki (Graduate School of Advanced Integrated Studies in Human Survivability, Kyoto University) Exoplanet and Star Texture Developer
Keiya Murashima (Kyoto University Faculty of Science)* Planetary Orbit Display Module Designer
Hiroaki Sato (Kyoto University Faculty of Agriculture)* Decided Habitable Criteria
Kazuya Mayanagi (Kyoto University Faculty of Science)* Assistant Developer for the Stellar Module
Shota Notsu (Kyoto University Graduate School of Science) Proposed Habitable Criteria, Estimates Stellar Parameters.
Yuta Notsu (Kyoto University Graduate School of Science) Proposed Habitable Criteria, Estimates Stellar Parameters.
Takaaki Ito (Kyoto University Faculty of Science)* Introduction of Kopparapu Criteria
Yuji Shimada (Kyoto University Faculty of Agriculture)* Estimated Mass Formula, Introduced (Larsen & Geoffrey, 2014)
Saaya Shimozaki (Shiga Prefectural Moriyama High School)** Exoplanet Image Development
Shione Fujita (Shiga Prefectural Moriyama High School)** Exoplanet Image Development
Takanori Sasaki (Kyoto University Graduate School of Science) Advisor and Designer for Entire Plan and Development of Planet Positions
** SGH Super Global High School
*Exoplanet Observation Promotional Members who Utilize ExoKyoto*
Takao Doi (Kyoto University Unit of Synergetic Studies for Space) Designed ExoKyoto Observation Module and Experimental observation
*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
Keywords: Exoplanet, Habitable Zone, SEAU