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: ASTROPHYSICS OF PLANETARY SYSTEMS: FORMATION, STRUCTURE, AND DYNAMICAL EVOLUTION

Pages: 399-400

276th Symposium of the International-Astronomical-Union on Astrophysics of Planetary Systems: Formation, Structure, and Dynamical Evolution

Torino, ITALY, OCT 10-15, 2010

Indexing

ISI Web of Knowledge - 1 Citation

Scopus - 0 Citations

Other information

Authenticus ID: P-005-70M

DOI: 10.1017/s1743921311020515

Abstract (EN): High-precision rachal-velocimetry (RV) is until now the more efficient way to discover planetary systems. Moreover, photometric; transit search missions like CoR.oT and Kepler, need spectroscopic RV measurements to establish the planetary nature of a transit candidate and to measure the true mass. An active star has on its photosphere dark spots and bright plages rotating with the star. These inhomogeneities of the stellar surface can induce a variation of the measurement of the RV, due to changes in lines shapes and not to a Doppler motion of the star (e.g. Queloz at al. 2001; Desort et al. 2007; Boisse at al. 2009). We study how the Keplerian fit used to search for planets in RV data is confused by spots and we test an approach to subtract RV jitter based on harmonic decomposition of the star rotation. We use simulations of spectroscopic measurements of rotating spotted stars and validate our approach on active stars monitored by high-precision spectrograph HARPS: CoRoT-7 and iota Hor.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 2