title: Seismic constraints on rotation of Sun-like star and mass of exoplanet.
abstract: Rotation is thought to drive cyclic magnetic activity in the Sun and Sun-like stars. Stellar dynamos, however, are poorly understood owing to the scarcity of observations of rotation and magnetic fields in stars. Here, inferences are drawn on the internal rotation of a distant Sun-like star by studying its global modes of oscillation. We report asteroseismic constraints imposed on the rotation rate and the inclination of the spin axis of the Sun-like star HD 52265, a principal target observed by the CoRoT satellite that is known to host a planetary companion. These seismic inferences are remarkably consistent with an independent spectroscopic observation (rotational line broadening) and with the observed rotation period of star spots. Furthermore, asteroseismology constrains the mass of exoplanet HD 52265b. Under the standard assumption that the stellar spin axis and the axis of the planetary orbit coincide, the minimum spectroscopic mass of the planet can be converted into a true mass of 1.85(-0.42)(+0.52)M(Jupiter), which implies that it is a planet, not a brown dwarf.
authors.affiliation: Max-Planck-Institut für Sonnensystemforschung, 37191 Katlenburg-Lindau, Germany.
authors.forename: Laurent
authors.initials: L
authors.lastname: Gizon
authors.forename: Jérome
authors.initials: J
authors.lastname: Ballot
authors.forename: Eric
authors.initials: E
authors.lastname: Michel
authors.forename: Thorsten
authors.initials: T
authors.lastname: Stahn
authors.forename: Gérard
authors.initials: G
authors.lastname: Vauclair
authors.forename: Hans
authors.initials: H
authors.lastname: Bruntt
authors.forename: Pierre-Olivier
authors.initials: PO
authors.lastname: Quirion
authors.forename: Othman
authors.initials: O
authors.lastname: Benomar
authors.forename: Sylvie
authors.initials: S
authors.lastname: Vauclair
authors.forename: Thierry
authors.initials: T
authors.lastname: Appourchaux
authors.forename: Michel
authors.initials: M
authors.lastname: Auvergne
authors.forename: Annie
authors.initials: A
authors.lastname: Baglin
authors.forename: Caroline
authors.initials: C
authors.lastname: Barban
authors.forename: Fréderic
authors.initials: F
authors.lastname: Baudin
authors.forename: Michaël
authors.initials: M
authors.lastname: Bazot
authors.forename: Tiago
authors.initials: T
authors.lastname: Campante
authors.forename: Claude
authors.initials: C
authors.lastname: Catala
authors.forename: William
authors.initials: W
authors.lastname: Chaplin
authors.forename: Orlagh
authors.initials: O
authors.lastname: Creevey
authors.forename: Sébastien
authors.initials: S
authors.lastname: Deheuvels
authors.forename: Noël
authors.initials: N
authors.lastname: Dolez
authors.forename: Yvonne
authors.initials: Y
authors.lastname: Elsworth
authors.forename: Rafael
authors.initials: R
authors.lastname: García
authors.forename: Patrick
authors.initials: P
authors.lastname: Gaulme
authors.forename: Stéphane
authors.initials: S
authors.lastname: Mathis
authors.forename: Savita
authors.initials: S
authors.lastname: Mathur
authors.forename: Benoît
authors.initials: B
authors.lastname: Mosser
authors.forename: Clara
authors.initials: C
authors.lastname: Régulo
authors.forename: Ian
authors.initials: I
authors.lastname: Roxburgh
authors.forename: David
authors.initials: D
authors.lastname: Salabert
authors.forename: Réza
authors.initials: R
authors.lastname: Samadi
authors.forename: Kumiko
authors.initials: K
authors.lastname: Sato
authors.forename: Graham
authors.initials: G
authors.lastname: Verner
authors.forename: Shravan
authors.initials: S
authors.lastname: Hanasoge
authors.forename: Katepalli R
authors.initials: KR
authors.lastname: Sreenivasan
mesh_terms: D001256:Astronomy; D008962:Models, Theoretical; D016083:Planets; D012399:Rotation; D055609:Stars, Celestial
keywords: extrasolar planets; stellar oscillations; stellar rotation
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