Four New Planets Orbiting Metal-enriched Stars*

C. G. Tinney; R. Paul Butler; Geoffrey W. Marcy; Hugh R. A. Jones; Alan J. Penny; Chris McCarthy; Brad D. Carter; Jade Bond

doi:10.1086/368068

Four New Planets Orbiting Metal-enriched Stars^*

C. G. Tinney¹, R. Paul Butler², Geoffrey W. Marcy^3,4, Hugh R. A. Jones⁵, Alan J. Penny⁶, Chris McCarthy², Brad D. Carter⁷, and Jade Bond^1,8

© 2003. The American Astronomical Society. All rights reserved. Printed in U.S.A.
The Astrophysical Journal, Volume 587, Number 1 Citation C. G. Tinney et al 2003 ApJ 587 423 DOI 10.1086/368068

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¹ Anglo-Australian Observatory, P.O. Box 296, Epping, NSW 1710, Australia

² Carnegie Institution of Washington, Department of Terrestrial Magnetism, 5241 Broad Branch Road NW, Washington, DC 20015-1305

³ Department of Astronomy, University of California, Berkeley, CA 94720

⁴ Department of Physics and Astronomy, San Francisco State University, San Francisco, CA 94132

⁵ Astrophysics Research Institute, Liverpool John Moores University, Twelve Quays House, Egerton Wharf, Birkenhead CH41 1LD, UK

⁶ Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX11 0QX, UK

⁷ Faculty of Sciences, University of Southern Queensland, Toowoomba, QLD 4350, Australia

⁸ School of Physics, University of Sydney, Sydney, NSW 2000, Australia

Dates

Received 2002 July 4
Accepted 2002 December 16

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Abstract

We report the detection of four new extrasolar planets from the Anglo-Australian Planet Search orbiting the metal-enriched stars HD 73526, HD 76700, HD 30177, and HD 2039. The planetary companion of HD 76700 has a circular orbit with a period of 3.98 days. With M sin i = (0.197 ± 0.017)M_J, or 0.69M_SAT, it is one of the lowest minimum mass extrasolar planets yet detected. The remaining planets all have elliptical orbits with periods ranging from 190.5 days to 4.4 yr. All four planets have been found orbiting hosts from a subsample of 20 metal-enriched and faint (V < 9) stars, which was added to the Anglo-Australian Planet Search's magnitude-limited V < 7.5 main sample in 1999 October. These stars were selected for metal enrichment on the basis of their Strömgren photometry, and their enrichment has been subsequently confirmed by detailed spectroscopic analysis.

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Footnotes

*
Based on observations obtained at the Anglo-Australian Telescope, Siding Spring, Australia.

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