Stellar activity, differential rotation, and exoplanets
arXiv:1009.4099 · doi:10.1017/S1743921311015067
Abstract
The photospheric spot activity of some of the stars with transiting planets discovered by the CoRoT space experiment is reviewed. Their out-of-transit light modulations are fitted by a spot model previously tested with the total solar irradiance variations. This approach allows us to study the longitude distribution of the spotted area and its variations versus time during the five months of a typical CoRoT time series. The migration of the spots in longitude provides a lower limit for the surface differential rotation, while the variation of the total spotted area can be used to search for short-term cycles akin the solar Rieger cycles. The possible impact of a close-in giant planet on stellar activity is also discussed.
6 pages, 1 figure, 1 table; invited talk at the IAU Symposium 273 "Physics of Sun and Star Spots", Eds. D. P. Choudhary and K. G. Strassmeier, Cambridge Univ. Press
References in corpus (14)
- The case for a distributed solar dynamo shaped by near-surface shear
- The On/Off Nature of Star-Planet Interactions
- Characterizing the Variability of Stars with Early-Release Kepler Data
- Extrasolar Giant Planets and X-ray Activity
- Hot Jupiters and stellar magnetic activity
- MOST detects variability on tau Bootis possibly induced by its planetary companion
- Transiting exoplanets from the CoRoT space mission IV: CoRoT-Exo-4b: A transiting planet in a 9.2 day synchronous orbit
- XMM-Newton observations of HD189733 during planetary transits
- Photospheric activity, rotation, and radial velocity variations of the planet-hosting star CoRoT-7
- Comparing different approaches to model the rotational modulation of the Sun as a star
- CoRoT-2a magnetic activity: hints for possible star-planet interaction
- Photospheric activity, rotation, and star-planet interaction of the planet-hosting star CoRoT-6
- Magnetic activity in the photosphere of CoRoT-Exo-2a. Active longitudes and short-term spot cycle in a young Sun-like star
- First Observation of Planet-Induced X-ray Emission: The System HD 179949