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29 March 2024
 
  » arxiv » 1004.1779

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Detection of a low-eccentricity and super-massive planet to the subgiant HD 38801
Hiroki Harakawa ; Bun'ei Sato ; Debra A. Fischer ; Shigeru Ida ; Masashi Omiya ; John A. Johnson ; Geoffrey W. Marcy ; Eri Toyota ; Yasunori Hori ; Andrew W. Howard ;
Date 11 Apr 2010
AbstractWe report the detection of a large mass planet orbiting around the K0 metal-rich subgiant HD38801 ($V=8.26$) by precise radial velocity (RV) measurements from the Subaru Telescope and the Keck Telescope. The star has a mass of $1.36M_{odot}$ and metallicity of [Fe/H]= +0.26. The RV variations are consistent with a circular orbit with a period of 696.0 days and a velocity semiamplitude of 200.0mps, which yield a minimum-mass for the companion of $10.7mjup$ and semimajor axis of 1.71 AU. Such super-massive objects with very low-eccentricities and hundreds of days period are uncommon among the ensemble of known exoplanets.
Source arXiv, 1004.1779
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