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

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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 MJup 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.

Original languageEnglish (US)
Pages (from-to)L63-L66
JournalAstrophysical Journal
Volume683
Issue number1 PART 2
DOIs
StatePublished - 2008

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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