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| Titel |
Star Spot Activities of Solar-type Stars with Hot-Jupiters in Kepler Data |
| VerfasserIn |
Li-Ching Huang, Wing-Huen Ip, Chi-Ju Wu |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250094714
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| Publikation (Nr.) |
 EGU/EGU2014-10143.pdf |
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| Zusammenfassung |
| The long-term observations of the Kepler space telescope provided high precision
time-series photometric measurements of more than 160,000 stars in a 115-square-degree
field near Cygnus and Lyra. More than 2,000 exoplanet candidates orbiting around
Solar-type stars have been found. Among them 15 are hot-Jupiters, which might
have strong star-planet interaction. In this study, we analysed the short cadence (1
minute) lightcurve data of Kepler-17, Kepler-41, and Kepler-43 that are G-type
main-sequence stars each with a hot-Jupiter. The masses of the host stars are 1.16 Msun,
0.94Msun, and 1.19 Msun, respectively. The masses of the hot-Jupiters around them are
2.45 MJ (Jovian mass), 0.49MJ, and 3.23 MJ, and the orbital periods are 1.48
d, 1.85 d and 3.02 d, respectively. The orbital planes of these hot-Jupiters are all
within 10 degrees of the line-of-sight. (Santerne et al. 2011 and Bonomo et al. 2012)
Kepler-17 showed strong magnetic activity of which the star spot coverage could be as
much as 5% of the hemispherical area. The other two have smaller spot sizes (~
0.5% of stellar hemispherical area). We have examined their lightcurves to check
whether they exhibit flare activities over the time interval of the Kepler measurements
(2009~2013). That none was found is consistent with the report by Shibata et al. (2012).
We examined the variations in the hot-Jupiter transiting lightcurves to measure
the spot size and location in detail. The statistical data can be used to infer the
migration process of the star spots across the stellar disk. The large size of its spots
means that Kepler-17 should have frequent occurrence of superflares. The absence of
superflare activity is therefore puzzling. The possible energy dissipation effect of
coronal magnetic field interaction with the hot-Jupiter (Kepler-17b) is discussed in the
study.
[References]
Bonomo, A. S., Hebrard, G., Santerne, A., et al. 2012, A&A, 538, A96
Bonomo, A. S. and Lanza, A. F. 2012, A&A, 547, A37
Santerne, A., Bonomo, A. S., Hebrard, G., et al. 2011, A&A, 536, A70
Shibata, K., Isobe, H., Hillier, A., et al. 2013, PASJ, vol. 65, No. 3 |
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