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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



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ID: 559469.0, MPI für Astronomie / Publikationen_mpia
A giant planet around a metal-poor star of extragalactic origin
Authors:Setiawan, Johny; Klement, Rainer J.; Henning, Thomas; Rix, Hans-Walter; Rochau, Boyke; Rodmann, Jens; Schulze-Hartung, Tim
Language:English
Date of Publication (YYYY-MM-DD):2010
Title of Journal:Science
Volume:330
Issue / Number:6011
Start Page:1642
End Page:1644
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:Stars in their late stage of evolution, such as horizontal branch stars, are still largely unexplored for planets. We detected a planetary companion around HIP 13044, a very metal-poor star on the red horizontal branch, on the basis of radial velocity observations with a high-resolution spectrograph at the 2.2-meter Max-Planck Gesellschaft–European Southern Observatory telescope. The star’s periodic radial velocity variation of P = 16.2 days caused by the planet can be distinguished from the periods of the stellar activity indicators. The minimum mass of the planet is 1.25 times the mass of Jupiter and its orbital semimajor axis is 0.116 astronomical units. Because HIP 13044 belongs to a group of stars that have been accreted from a disrupted satellite galaxy of the Milky Way, the planet most likely has an extragalactic origin.
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL:http://adsabs.harvard.edu/abs/2010Sci...330.1642S [ID No:1]
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