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, and, Andrew W. Howard
TL;DR
This paper reports the discovery of a super-massive, low-eccentricity exoplanet orbiting the subgiant star HD 38801, using precise radial velocity measurements from Subaru and Keck telescopes.
Contribution
It presents the detection of a large-mass planet with a nearly circular orbit around a metal-rich subgiant, highlighting a rare class of exoplanets.
Findings
Planet mass of 10.7 Jupiter masses
Orbital period of 696 days
Low eccentricity orbit
Abstract
We report the detection of a large mass planet orbiting around the K0 metal-rich subgiant HD38801 () by precise radial velocity (RV) measurements from the Subaru Telescope and the Keck Telescope. The star has a mass of 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 200.0\mps, which yield a minimum-mass for the companion of 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.
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