About ExoKyoto

About “ExoKyoto”

ExoKyoto is an integrated database of confirmed exoplanets, capable of comparing several different definitions of Habitable Zones. It has been developed and launched for better comprehension of these existing celestial bodies in different star systems. The ExoKyoto core-module is written in C++, with definitions of different classes such as “ExoPlanet” and “HostStar” objects. The classification of Habitable zones for each host star is based on Kopparapu et al. (2013) as the reference case, with two different sets of coefficients. At the same time, the database determines Solar Equivalent Astronomical Units (SEAU), to promote easy comprehension of different star systems equivalent to that of our Solar System.

The database has an inter-comparison module with existing exoplanet databases such as Exoplanet.eu, Open Exoplanet Catalogue, and NASA Exoplanet archive; and an updating module to secure commonly agreed values for each planet. Since most of the exoplanets found by the Kepler space telescope are detected only by the transit method, we cannot confirm their mass by radial velocity. Therefore, the mass estimation module for most of the Super-Earth-sized planets included in the database is based on Larsen and Geoffrey (2014). The database also 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 exoplanets, but also hundreds of thousands of stars existing in the star database (listed in hyg database). Each host star can be referred to in the catalogue with its habitable zone calculated, based on the observed/estimated star parameters, with an 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 in the system.

For outreach and observation support purposes, ExoKyoto also includes 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 at the beginning of September, however, we hope everyone can use this system. For those who are interested in using the system, please write to us at mail@exoplanetkyoto.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

*ILAS Seminar
** 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