Detection of a low-eccentricity and super-massive planet to the subgiant HD 38801
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 1.36M 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, which yield a minimum-mass for the companion of 10.7 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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