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American Astronomical Society, Astrophysical Journal, 1(715), p. 550-553, 2010

DOI: 10.1088/0004-637x/715/1/550

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Detection of a Low-eccentricity and Super-massive Planet to the Subgiant HD 38801

Journal article published in 2010 by Hiroki Harakawa, Bun'ei Sato, Debra A. Fischer ORCID, Shigeru Ida, Masashi Omiya, John A. Johnson, Geoffrey W. Marcy, Eri Toyota, Yasunori Hori, and Andrew W. Howard
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

We 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 1.36 M_☉ and a 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 200.0 m s^(–1), which yield a minimum mass for the companion of 10.7 M JUP and a semimajor axis of 1.71 AU. Such super-massive objects with very low eccentricities and periods of hundreds of days are uncommon among the ensemble of known exoplanets.