Fourteen New Companions from the Keck and Lick Radial Velocity Survey Including Five Brown Dwarf Candidates
Abstract
We present radial velocities for 14 stars on the California and Carnegie Planet Search target list that reveal new companions. One star, HD 167665, was fit with a definitive Keplerian orbit leading to a minimum mass for the companion of 50.3 M_(Jup) at a separation from its host of ~5.5 AU. Incomplete or limited phase coverage for the remaining 13 stars prevents us from assigning to them unique orbital parameters. Instead, we fit their radial velocities with Keplerian orbits across a grid of fixed values for M sin i and period P, and use the resulting χ^2_v surface to place constraints on M sin i, P, and semimajor axis ɑ. This technique allowed us to restrict M sin i below the brown dwarf-stellar mass boundary for an additional four companions (HD 150554, HD 8765, HD 72780, HD 74014). If the combined five companions are confirmed as brown dwarfs, these results would comprise the first major catch of such objects from our survey beyond ~3 AU.
Additional Information
© 2007 American Astronomical Society. Received 2007 February 21; accepted 2007 April 23. Based on observations obtained at the W. M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California, and the National Aeronautics and Space Administration. The Observatory wa smade possible by the generous financial support of the W. M. Keck Foundation. The authors wish to acknowledge the collective efforts of those involved with the CCPS, including that of the staffs of both Keck and Lick Observatories. S. G. P. thanks John Garrett and Stephen Eikenberry for their instruction and encouragement in pursuing a career in science. S. S. V. acknowledges support from NSF grant AST-0307493. We are appreciative of the UCO/Lick-Keck TAC for the opportunity given to conduct this research. This research has made use of the SIMBAD database, operated at CDS, Strasbourg, France. The authors wish to recognize and acknowledge the very significant cultural role and reverence that the summit of Mauna Kea has always had within the indigenous Hawaiian community. We are most fortunate to have the opportunity to conduct observations from this mountain.Attached Files
Published - 0004-637X_665_1_744.pdf
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Additional details
- Eprint ID
- 36264
- Resolver ID
- CaltechAUTHORS:20130109-092842416
- AST-0307493
- NSF
- Created
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2013-01-09Created from EPrint's datestamp field
- Updated
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2021-11-09Created from EPrint's last_modified field