The Jupiter Twin HD 154345b

Details The Jupiter Twin HD 154345b The Jupiter Twin HD 154345b

2008-02-12

arxiv.org/abs/0802.1731v2

Astronomy and Astrophysics

Astrophysics

15pp. ApJL. v2: Substantial additions, including 3 new authors, new photometry, activity measurements, and a discussion of act

Scientific paper

10.1086/587461

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 Jupiter masses 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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