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A Planetary-Mass Companion to the K0 Giant HD 17092

Niedzielski, A. and Konacki, M. and Wolszczan, A. and Nowak, G. and Maciejewski, G. and Gelino, C. R. and Shao, M. and Shetrone, M. and Ramsey, L. W. (2007) A Planetary-Mass Companion to the K0 Giant HD 17092. Astrophysical Journal, 669 (2). pp. 1354-1358. ISSN 0004-637X.

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We report the discovery of a substellar-mass companion to the K0 giant HD 17092 with the Hobby-Eberly Telescope. In the absence of any correlation of the observed 360 day periodicity with the standard indicators of stellar activity, the observed radial velocity variations are most plausibly explained in terms of a Keplerian motion of a planetary-mass body around the star. As the estimated stellar mass is 2.3 M_⊙, the minimum mass of the planet is 4.6 M_J. The planet's orbit is characterized by a mild eccentricity of e = 0.17 and a semimajor axis of 1.3 AU. This is the tenth published detection of a planetary companion around a red giant star. Such discoveries add to our understanding of planet formation around intermediate-mass stars, and they provide dynamical information on the evolution of planetary systems around post-main-sequence stars.

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Additional Information:© 2007 The American Astronomical Society. Received 2007 May 1; accepted 2007 July 18. We thank Shri Kulkarni for his contribution to the initial development of this project and the Hobby-Eberly Telescope (HET) resident astronomers and telescope operators for support. The FTS iodine spectrum was kindly provided by Bill Cochran. A. N., A.W., G. N., and G. M. were supported in part by the Polish Ministry of Science and Higher Education grant 1P03D007 30. A.W. also acknowledges partial support from the NASA Astrobiology Program. M. K. was supported by NASA through grant NNG04GM62G. G. N. is a recipient of a graduate stipend of the Chairman of the Polish Academy of Sciences. The HET is a joint project of the University of Texas at Austin, Pennsylvania State University, Stanford University, Ludwig-Maximilians-Universität München, and Georg- August-Universität Göttingen. The HET is named in honor of its principal benefactors, William P. Hobby and Robert E. Eberly.
Funding AgencyGrant Number
Polish Ministry of Science and Higher Education1P03D007 30
NASA Astrobiology ProgramUNSPECIFIED
Subject Keywords:planetary systems; stars : individual (HD 17092)
Issue or Number:2
Record Number:CaltechAUTHORS:20100219-112841058
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Official Citation:A Planetary-Mass Companion to the K0 Giant HD 17092 A. Niedzielski, M. Konacki, A. Wolszczan, G. Nowak, G. Maciejewski, C. R. Gelino, M. Shao, M. Shetrone, and L. W. Ramsey 2007 ApJ 669 1354-1358 doi: 10.1086/521784
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:17540
Deposited By: Tony Diaz
Deposited On:22 Feb 2010 16:59
Last Modified:03 Oct 2019 01:29

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