Seismic constraints on rotation of Sun-like star and mass of exoplanet

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 study...

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Published in:Proceedings of the National Academy of Sciences - PNAS 2013-08, Vol.110 (33), p.13267-13271
Main Authors: Gizon, Laurent, Ballot, Jérome, Michel, Eric, Stahn, Thorsten, Vauclair, Gérard, Bruntt, Hans, Quirion, Pierre-Olivier, Benomar, Othman, Vauclair, Sylvie, Appourchaux, Thierry, Auvergne, Michel, Baglin, Annie, Barban, Caroline, Baudin, Fréderic, Bazot, Michaël, Campante, Tiago, Catala, Claude, Chaplin, William, Creevey, Orlagh, Deheuvels, Sébastien, Dolez, Noël, Elsworth, Yvonne, García, Rafael, Gaulme, Patrick, Mathis, Stéphane, Mathur, Savita, Mosser, Benoît, Régulo, Clara, Roxburgh, Ian, Salabert, David, Samadi, Réza, Sato, Kumiko, Verner, Graham, Hanasoge, Shravan, Sreenivasan, Katepalli R.
Format: Article
Language:English
Subjects:
Asteroseismology
Astronomy
Astrophysics
Brown dwarfs
Extrasolar planets
Hot Jupiters
Magnetic fields
Models, Theoretical
Physical Sciences
Physics
Planetary orbits
Planets
Rotation
Satellites
Seismology
Solar rotation
Stars
Stars & galaxies
Stars, Celestial
Stellar masses
Stellar rotation
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Summary: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 [Formula], which implies that it is a planet, not a brown dwarf.
ISSN:0027-8424
1091-6490
DOI:10.1073/pnas.1303291110