Disentangling planetary orbits from stellar activity in radial-velocity surveys

R. D. Haywood, A. Collier Cameron, D. Queloz, S. C.C. Barros, M. Deleuil, R. Fares, M. Gillon, A. Hatzes, A. F. Lanza, C. Lovis, C. Moutou, F. Pepe, D. Pollacco, A. Santerne, D. Ségransan, Y. Unruh

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

The majority of extra-solar planets have been discovered (or confirmed after follow-up) through radial-velocity (RV) surveys. Using ground-based spectrographs such as High Accuracy Radial Velocity Planetary Search (HARPS) and HARPS-North, it is now possible to detect planets that are only a few times the mass of the Earth. However, the presence of dark spots on the stellar surface produces RV signals that are very similar in amplitude to those caused by orbiting low-mass planets. Disentangling these signals has thus become the biggest challenge in the detection of Earth-mass planets using RV surveys. To do so, we use the star's lightcurve to model the RV variations produced by spots. Here we present this method and show the results of its application to CoRoT-7.

Original languageEnglish
Pages (from-to)155-157
Number of pages3
JournalInternational Journal of Astrobiology
Volume13
Issue number2
DOIs
Publication statusPublished - Apr 2014
Externally publishedYes

Keywords

  • astronomy
  • detection of Earth-mass planets
  • stellar activity
  • study of individual planetary systems: CoRoT-7
  • techniques: radial velocities

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Physics and Astronomy (miscellaneous)
  • Space and Planetary Science
  • Earth and Planetary Sciences (miscellaneous)

Fingerprint

Dive into the research topics of 'Disentangling planetary orbits from stellar activity in radial-velocity surveys'. Together they form a unique fingerprint.

Cite this