Flare and Chromospheric Activity of Low-mass Stars and Binaries

Li-Ching Huang^1*, Wing-Huen Ip², A-Li Luo³

¹Center of Astronomy and Gravitation, National Taiwan Normal University, Taipei, Taiwan
²Institute of Astronomy, National Central University, Taoyuan, Taiwan
³National Astronomical Observatories, Chinese Academy of Sciences, Beijing, China

* Presenter:Li-Ching Huang, email:lchuang@ntnu.edu.tw

Stellar flare activity plays an important role in the habitability of planets. Previous studies proposed that the star-planet interaction is the cause of the flare activity on the exoplanet host stars. However, Maehara et al. (2012) and Shibiyama et al. (2013) didn’t find exoplanet transiting features in the solar type flare stars’ lightcurves in Kepler observation. We selected 4,199 G and K type stars and binaries. With the spectra from LAMOST and LISA onboard Lulin One-meter Telescope, we measure their chromospheic activity using H-alpha emission level and identify their flare and photospheric activity with Kepler/TESS lightcurves. In this work we find that exoplanet host stars have similar chromospheric active level with the non-flaring stars. It shows that exoplanet host stars are magnetically inactive, and this result agrees with Maehara’s and Shibiyama’s results.

Keywords: stellar flare, eclipsing binary, star-planet interaction