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Superflares on Late-Type Stars

Published online by Cambridge University Press:  29 April 2014

Hiroyuki Maehara
Affiliation:
Kwasan Observatory, Kyoto University, 17 Ohmine-cho, Kita-Kazan, Yamashina, Kyoto, Japan email: maehara@kwasan.kyoto-u.ac.jp
Takuya Shibayama
Affiliation:
Kwasan Observatory, Kyoto University, 17 Ohmine-cho, Kita-Kazan, Yamashina, Kyoto, Japan email: maehara@kwasan.kyoto-u.ac.jp
Yuta Notsu
Affiliation:
Kwasan Observatory, Kyoto University, 17 Ohmine-cho, Kita-Kazan, Yamashina, Kyoto, Japan email: maehara@kwasan.kyoto-u.ac.jp
Shota Notsu
Affiliation:
Kwasan Observatory, Kyoto University, 17 Ohmine-cho, Kita-Kazan, Yamashina, Kyoto, Japan email: maehara@kwasan.kyoto-u.ac.jp
Tanashi Nagao
Affiliation:
Kwasan Observatory, Kyoto University, 17 Ohmine-cho, Kita-Kazan, Yamashina, Kyoto, Japan email: maehara@kwasan.kyoto-u.ac.jp
Satoshi Honda
Affiliation:
Kwasan Observatory, Kyoto University, 17 Ohmine-cho, Kita-Kazan, Yamashina, Kyoto, Japan email: maehara@kwasan.kyoto-u.ac.jp
Daisaku Nogami
Affiliation:
Kwasan Observatory, Kyoto University, 17 Ohmine-cho, Kita-Kazan, Yamashina, Kyoto, Japan email: maehara@kwasan.kyoto-u.ac.jp
Kazunari Shibata
Affiliation:
Kwasan Observatory, Kyoto University, 17 Ohmine-cho, Kita-Kazan, Yamashina, Kyoto, Japan email: maehara@kwasan.kyoto-u.ac.jp
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Abstract

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We present the results of an extensive survey of superflares on late-type stars (G, K, and M-type main sequence stars) using the Kepler satellite data. Wefound about 6,800 superflares on late-type stars from the data of about 120,000 stars observed over 500 days. The total bolometric energy of superflares in oursample ranges from 1032 erg to 1036 erg. Our data suggest that the occurrencefrequency of superflares depends on the surface temperature and the rotationperiod of stars. Superflares on M-type stars occur about 10-100 times morefrequently than those on G-type stars. Our results suggest that the average frequency ofsuperflares releasing 1034–1035 erg of energy (100-1,000 times larger than the largestsolar flares) on M-type stars and Sun-like stars is once in 10 years and once in a few thousand years respectively.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2014 

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