Disentangling stellar activity and planetary signals

• Type: Article in International Conference Proceedings Book
• Date: 2011

Authors

Boisse, I (Author) Other; Bouchy, F (Author) Other; Hebrard, G (Author) Other; Bonfils, X (Author) Other; N.C. Santos (Author) FCUP; Vauclair, S (Author) Other

Conference proceedings International

Title: DETECTION AND DYNAMICS OF TRANSITING EXOPLANETS

International Conference on Transiting Planets - Detection and Dynamics

FRANCE, AUG 23-27, 2010

Indexing

ISI Web of Knowledge - 1 Citation

Scopus - 1 Citation

Other information

Authenticus ID: P-005-70V

DOI: 10.1051/epjconf/20111102005

Abstract (EN): Photospheric stellar activity (i.e. dark spots or bright plages) might be an important source of noise and confusion in the radial-velocity (RV) measurements. Radial-velocimetry planet search surveys as well as follow-up of photometric transit surveys require a deep understanding and precise characterization of the effects of stellar activity, in order to disentangle it from planetary signals. We simulate dark spots on a rotating stellar photosphere. The variations of the RV are characterized and analyzed according to the stellar inclination, the latitude and the number of spots. The Lomb-Scargle periodograms of the RV variations induced by activity present power at the rotational period P(rot) of the star and its two-first harmonics P(rot)/2 and P(rot)/3. Three adjusted sinusoids fixed at the fundamental period and its two-first harmonics allow to remove about 90% of the RV jitter amplitude. We apply and validate our approach on four known active planet-host stars: HD 189733, GJ 674, CoRoT-7 and l Hor.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 6