DETECTION OF A LOW-ECCENTRICITY AND SUPER-MASSIVE PLANET TO THE SUBGIANT HD 38801
| Autor: | Masashi Omiya, Debra A. Fischer, Yasunori Hori, Geoffrey W. Marcy, Eri Toyota, John Asher Johnson, Hiroki Harakawa, Andrew W. Howard, Bun'ei Sato, Shigeru Ida |
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| Rok vydání: | 2010 |
| Předmět: |
Earth and Planetary Astrophysics (astro-ph.EP)
Physics Subgiant Metallicity FOS: Physical sciences Astronomy and Astrophysics Astrophysics Exoplanet law.invention Telescope Radial velocity Space and Planetary Science law Planet Circular orbit Subaru Telescope Astrophysics - Earth and Planetary Astrophysics |
| Zdroj: | The Astrophysical Journal. 715:550-553 |
| ISSN: | 1538-4357 0004-637X |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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