Oral Presentation

Properties of M-dwarf Exoplanets Unveiled by Transit Surveys and Follow-up Observations

Author(s): Teruyuki Hirano, KESPRINT collaboration

Presenter: Teruyuki Hirano (Tokyo Institute of Technology)

Recently, M dwarfs are drawing more attention in the search for exoplanets. This is because M dwarfs are small in mass and radius, which facilitates the detection of small (Earth-like) planets by both radial velocity and transit methods. The habitable zone of M dwarfs, where the planet surface temperature is moderate so that liquid water can be present, is also close to the central stars, which is important for future atmospheric characterizations. In the framework of KESPRINT collaboration, we have investigated transiting planets around bright stars, observed by the Kepler's second mission known as "K2". In the previous campaigns, we have detected dozens of transiting exoplanet candidates around M dwarfs, and conducted follow-up observations with Subaru and other facilities to validate these planets. In this talk, we will introduce the latest status on our K2 planet search and follow-up observations by Subaru. Combining our newly discovered planets around M dwarfs together with previously validated ones, we will present the general properties of M-dwarf planets, focusing on their comparison with planets around solar-type stars. We will also discuss the future prospects on the exoplanet searches, especially for M dwarfs, using the current and upcoming instruments on Subaru.