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

• Type: Article in International Scientific Journal
• Date: 2013

Authors

Gizon, L (Author) Other; Ballot, J (Author) Other; Michel, E (Author) Other; Stahn, T (Author) Other; Vauclair, G (Author) Other; Bruntt, H (Author) Other; Quirion, PO (Author) Other; Benomar, O (Author) Other; Vauclair, S (Author) Other; Appourchaux, T (Author) Other; Auvergne, M (Author) Other; Baglin, A (Author) Other; Barban, C (Author) Other; Baudin, F (Author) Other; Bazot, M (Author) Other; Campante, T (Author) Other; Catala, C (Author) Other; Chaplin, W (Author) Other; Creevey, O (Author) Other; Deheuvels, S (Author) Other; Dolez, N (Author) Other; Elsworth, Y (Author) Other; Garcia, R (Author) Other; Gaulme, P (Author) Other; Mathis, S (Author) Other; Mathur, S (Author) Other; Mosser, B (Author) Other; Regulo, C (Author) Other; Roxburgh, I (Author) Other; Salabert, D (Author) Other; Samadi, R (Author) Other; Sato, K (Author) Other; Verner, G (Author) Other; Hanasoge, S (Author) Other; Sreenivasan, KR (Author) Other

Journal

Title: Proceedings of the National Academy of Sciences of the United States of America

Vol. 110

ISSN: 0027-8424

Publisher: National Academy of Sciences

Indexing

ISI Web of Knowledge - 37 Citations

Scopus - 11 Citations

Other information

Authenticus ID: P-006-885

DOI: 10.1073/pnas.1303291110

Abstract (EN): 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 5