Two exoplanets discovered at keck observatory

Jeff A. Valenti, Debra Fischer, Geoffrey W. Marcy, John A. Johnson, Gregory W. Henry, Jason T. Wright, Andrew W. Howard, Matt Giguere, Howard Isaacson

Research output: Contribution to journalArticlepeer-review

46 Scopus citations


We present two exoplanets detected at Keck Observatory. HD 179079 is a G5 subgiant that hosts a hot Neptune planet with M sin i = 27.5 M in a 14.48 days, low-eccentricity orbit. The stellar reflex velocity induced by this planet has a semiamplitude of K = 6.6 m s-1. HD 73534 is a G5 subgiant with a Jupiter-like planet of M sin i = 1.1 M Jup and K = 16 m s-1 in a nearly circular 4.85 yr orbit. Both stars are chromospherically inactive and metal-rich. We discuss a known, classical bias in measuring eccentricities for orbits with velocity semiamplitudes, K, comparable to the radial velocity uncertainties. For exoplanets with periods longer than 10 days, the observed exoplanet eccentricity distribution is nearly flat for large amplitude systems (K > 80 m s -1), but rises linearly toward low eccentricity for lower amplitude systems (K > 20 m s-1).

Original languageEnglish (US)
Pages (from-to)989-997
Number of pages9
JournalAstrophysical Journal
Issue number2
StatePublished - 2009

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


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