The HARPS search for southern extrasolar planets XXV. Results from the metal-poor sample

Details The HARPS search for southern extrasolar planets XXV. Results from the metal-poor sample The HARPS search for southern extrasolar planets XXV. Results from the metal-poor sample

2010-11-09

arxiv.org/abs/1011.2094v1

Astronomy and Astrophysics

Astrophysics

Earth and Planetary Astrophysics

Accepted for publication in A&A

Scientific paper

Searching for extrasolar planets around stars of different metallicity may provide strong constraints to the models of planet formation and evolution. In this paper we present the overall results of a HARPS (a high-precision spectrograph mostly dedicated to deriving precise radial velocities) program to search for planets orbiting a sample of 104 metal-poor stars (selected [Fe/H] below -0.5). Radial velocity time series of each star are presented and searched for signals using several statistical diagnostics. Stars with detected signals are presented, including 3 attributed to the presence of previously announced giant planets orbiting the stars HD171028, HD181720, and HD190984. Several binary stars and at least one case of a coherent signal caused by activity-related phenomena are presented. One very promising new, possible giant planet orbiting the star HD107094 is discussed, and the results are analyzed in light of the metallicity-giant planet correlation. We conclude that the frequency of giant planets orbiting metal-poor stars may be higher than previously thought, probably reflecting the higher precision of the HARPS survey. In the metallicity domain of our sample, we also find evidence that the frequency of planets is a steeply rising function of the stellar metal content, as found for higher metallicity stars.

Affiliated with

Also associated with

No associations

Rating

The HARPS search for southern extrasolar planets XXV. Results from the metal-poor sample does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The HARPS search for southern extrasolar planets XXV. Results from the metal-poor sample, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The HARPS search for southern extrasolar planets XXV. Results from the metal-poor sample will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-493627