The Jupiter Twin HD 154345b*

J. T. Wright; G. W. Marcy; R. P. Butler; S. S. Vogt; G. W. Henry; H. Isaacson; A. W. Howard

doi:10.1086/587461

The Jupiter Twin HD 154345b^*

J. T. Wright¹, G. W. Marcy², R. P. Butler³, S. S. Vogt⁴, G. W. Henry⁵, H. Isaacson⁶, and A. W. Howard^2,7

Published 2008 July 23 • © 2008. The American Astronomical Society. All rights reserved. Printed in U.S.A.
The Astrophysical Journal, Volume 683, Number 1 Citation J. T. Wright et al 2008 ApJ 683 L63 DOI 10.1086/587461

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Author affiliations

¹ Department of Astronomy, 610 Space Sciences Building, Cornell University, Ithaca, NY 14853

² Department of Astronomy, 601 Campbell Hall, University of California, Berkeley, CA 94720-3411

³ Department of Terrestrial Magnetism, Carnegie Institute of Washington, 5241 Broad Branch Road NW, Washington, DC 20015-1305

⁴ UCO/Lick Observatory, University of California, Santa Cruz, CA 95064

⁵ Center of Excellence in Information Systems, Tennessee State University, 3500 John A. Merritt Boulevard, Box 9501, Nashville, TN 37209

⁶ Department of Physics and Astronomy, San Francisco State University, San Francisco, CA 94132

⁷ Townes Fellow, Space Sciences Laboratory, University of California, Berkeley

Dates

Received 2008 January 8
Accepted 2008 February 12
Published 2008 July 23

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Abstract

We announce the discovery of a twin of Jupiter orbiting the slightly metal-poor ([Fe/H] = − 0.1) nearby (d = 18 pc) G8 dwarf HD 154345. This planet has a minimum mass of 0.95 M_Jup and a 9.2 year, circular orbit with radius 4.2 AU. There is currently little or no evidence for other planets in the system, but smaller or exterior planets cannot yet be ruled out. We also detect a ~ 9 year activity cycle in this star photometrically and in chromospheric emission. We rule out activity cycles as the source of the radial velocity variations by comparison with other cycling late G dwarfs.

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Footnotes

*
Based on observations obtained at the W. M. Keck Observatory, which is operated jointly by the University of California and the California Institute of Technology. The Keck Observatory was made possible by the generous financial support of the W. M. Keck Foundation.

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