Multiple companions to HD 154857 and HD 160691

McCarthy, Chris and Butler, R. Paul and Tinney, C. G. and Jones, Hugh R. A. and Marcy, Geoffrey W. and Carter, Brad and Penny, Alan J. and Fischer, Debra A. (2004) Multiple companions to HD 154857 and HD 160691. The Astrophysical Journal, 617 (1). pp. 575-579. ISSN 0004-637X

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Abstract

[Abstract]: Precise Doppler measurements from the Anglo-Australian Telescope (AAT) UCLES spectrometer reveal two
companions to both HD 154857 and HD 160691. The inner companion to HD 154857 has a period of 398 days, an
eccentricity of 0.51, and a minimum mass of 1.8MJ. An outer companion has a period much longer than 2 yr and is
currently detected only as a linear trend of 14 m s1 yr1. The inner companion to HD 160691, previously
announced from AAT data, has a period of 645 days, an eccentricity of 0.20, and a minimum mass of 1.7MJ. For
the outer planet, whose orbit is less well constrained, a two-Keplerian fit yields a period of 8.2 yr, an eccentricity of
0.57, and a minimum mass of 3.1MJ. With these orbital parameters, its maximum separation from the star of 0B4
makes it a viable target for direct imaging.

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Item Type:	Article (Commonwealth Reporting Category C)
Refereed:	Yes
Item Status:	Live Archive
Additional Information:	Published version made accessible, in accordance with the copyright policy of the publisher.
Faculty / Department / School:	Historic - Faculty of Sciences - Department of Biological and Physical Sciences
Date Deposited:	11 Oct 2007 00:21
Last Modified:	24 Mar 2017 03:15
Uncontrolled Keywords:	planetary systems, stars, HD 154857, HD 160691
Fields of Research :	02 Physical Sciences > 0201 Astronomical and Space Sciences > 020102 Astronomical and Space Instrumentation
URI:	http://eprints.usq.edu.au/id/eprint/456

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