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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 607178.0, MPI für Astronomie / Publikationen_mpia
A planetary companion around a metal-poor star with extragalactic origin
Authors:Setiawan, J.; Klement, R.; Henning, T.; Rix, H.-W.; Rochau, B.; Schulze-Hartung, T.; Rodmann, J.; Drechsel, H.; Heber, U.
Date of Publication (YYYY-MM-DD):2011
Title of Proceedings:Planetary Sytems Beyond the Main Sequence
Start Page:182
End Page:189
Volume (in Series):1331
Audience:Not Specified
Abstract / Description:We report the detection of a planetary companion around HIP 13044, a metal-poor star on the red Horizontal Branch. The detection is based on radial velocity observations with FEROS, a high-resolution spectrograph at the 2.2-m MPG/ESO telescope, located at ESO La Silla observatory in Chile. The periodic radial velocity variation of P = 16.2 days can be distinguished from the periods of the stellar activity indicators. We computed a minimum planetary mass of 1.25 MJup and an orbital semi-major axis of 0.116 AU for the planet. This discovery is unique in three aspects: First, it is the first planet detection around a star with a metallicity much lower than few percent of the solar value; second, the planet host star resides in a stellar evolutionary stage that is still unexplored in the exoplanet surveys; third, the star HIP 13044 belongs to one of the most significant stellar halo streams in the solar neighborhood, implying an extragalactic origin of the planetary system HIP 13044 in a disrupted former satellite of the Milky Way.
Free Keywords:astronomical observatories; stellar evolution; satellites; artificial; stellar mass; globular star clusters; Observatories and site testing; Black holes; Artificial Earth satellites; Masses; Globular clusters in the Milky Way
Comment of the Author/Creator:Date: 2011, March 1, 2011
External Publication Status:published
Document Type:Conference-Paper
Communicated by:N. N.
Affiliations:MPI für Astronomie
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