J/other/Nat/485.478 Superflares on solar-type stars (Maehara+, 2012)
Superflares on solar-type stars.
Maehara H., Shibayama T., Notsu S., Notsu Y., Nagao T., Kusaba S.,
Honda S., Nogami D., Shibata K.
<Nature, 485, 478-481 (2012)>
=2012Natur.485..478M 2012Natur.485..478M
ADC_Keywords: Stars, G-type ; Stars, variable ; Stars, flare
Abstract:
Solar flares are caused by the sudden release of magnetic energy
stored near sunspots. They release 1029 to 1032ergs of energy on a
timescale of hours. Similar flares have been observed on many stars,
with larger 'superflares' seen on a variety of stars, some of which
are rapidly rotating and some of which are of ordinary solar type. The
small number of superflares observed on solar-type stars has hitherto
precluded a detailed study of them. Here we report observations of 365
superflares, including some from slowly rotating solar-type stars,
from about 83,000 stars observed over 120 days. Quasi-periodic
brightness modulations observed in the solar-type stars suggest that
they have much larger starspots than does the Sun. The maximum energy
of the flare is not correlated with the stellar rotation period, but
the data suggest that superflares occur more frequently on rapidly
rotating stars. It has been proposed that hot Jupiters may be
important in the generation of superflares on solar-type stars, but
none have been discovered around the stars that we have studied,
indicating that hot Jupiters associated with superflares are rare.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tables1.dat 48 148 List of G-type main sequence stars showing superflares
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See also:
V/133 : Kepler Input Catalog (Kepler Mission Team, 2009)
Byte-by-byte Description of file: tables1.dat
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Bytes Format Units Label Explanations
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1- 8 I8 --- KIC KIC identification number (Cat. V/133)
10- 13 I4 K Teff Effective temperature from KIC
15- 17 F3.1 [cm/s2] logg Gravity surface from KIC
19- 23 F5.2 mag gmag g magnitude from KIC
25- 30 F6.3 d Per Period of the largest amplitude component of
the brightness variation
32- 38 E7.3 --- Amp Normalized amplitude of the dominant period
40- 41 I2 --- N Number of detected flares
43- 48 E6.2 yr-1 FRate Flare rate
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 04-Jun-2012