論文摘要

Characterization of the space weather effects of some habitable exoplanets

[ Poster ]

Li-Ching Huang, Wing-Huen Ip, Chia-Lung Lin, Yao Hsiao and Fiona Chang

A good environment of a habitable exoplanet includes the following conditions, e.g., the surface temperature and pressure that water can be kept in liquid state on the planetary surface. The space weather effect is also important to the habitability (and sustainability) issue. That is, strong magnetic field activity of a host star would produce anomalous X-ray and UV radiation that are harmful to the biosphere in existence. Interaction of the energetic charged particles impacting the exo-planetary atmosphere could lead also to atmospheric loss or modification of the atmospheric composition. In this study, we analyze the flare activities of a number of solar-type stars with potentially habitable exoplanets by examining the light curves from the Kepler mission. Using the chronology of Earth's biosphere as a "standard candle", the developmental phases of' the hypothetical biospheres of individual exoplanets (i.e., Kepler-62e, Kepler-62f, Kepler-186f, Kepler-442b, Kepler-452b, Kepler-1229b, and Kepler-1638b) are compared. For those with very thin atmospheres, the possible existence of a deep hot biosphere is also considered.