Planetary companions around the metal-poor star HIP 11952

Details Planetary companions around the metal-poor star HIP 11952 Planetary companions around the metal-poor star HIP 11952

Apr 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012a%26a...540a.141s&link_type=abstract

Astronomy & Astrophysics, Volume 540, id.A141

Astronomy and Astrophysics

Astrophysics

Stars: Abundances, Techniques: Spectroscopic, Planetary Systems, Techniques: Radial Velocities, Stars: Individual: Hip 11952

Scientific paper

Aims: We carried out a radial-velocity survey to search for planets around metal-poor stars. In this paper we report the discovery of two planets around HIP 11952, a metal-poor star with [Fe/H] = -1.9 that belongs to our target sample. Methods: Radial velocity variations of HIP 11952 were monitored systematically with FEROS at the 2.2 m telescope located at the ESO La Silla observatory from August 2009 until January 2011. We used a cross-correlation technique to measure the stellar radial velocities (RV). Results: We detected a long-period RV variation of 290 d and a short-period one of 6.95 d. The spectroscopic analysis of the stellar activity reveals a stellar rotation period of 4.8 d. The Hipparcos photometry data shows intra-day variabilities, which give evidence for stellar pulsations. Based on our analysis, the observed RV variations are most likely caused by the presence of unseen planetary companions. Assuming a primary mass of 0.83 M&sun;, we computed minimum planetary masses of 0.78 MJup for the inner and 2.93 MJup for the outer planet. The semi-major axes are a1 = 0.07 AU and a2 = 0.81 AU, respectively. Conclusions: HIP 11952 is one of very few stars with [Fe/H] < -1.0 which have planetary companions. This discovery is important to understand planet formation around metal-poor stars.

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