DETECTION OF A LOW-ECCENTRICITY AND SUPER-MASSIVE PLANET TO THE SUBGIANT HD 38801

Journal Article · Thu May 20 00:00:00 EDT 2010 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/715/1/550· OSTI ID:21448739

Harakawa, Hiroki; Ida, Shigeru; Hori, Yasunori ^[1]; Sato, Bun'ei ^[2]; Fischer, Debra A ^[3]; Omiya, Masashi ^[4]; Johnson, John A ^[5]; Marcy, Geoffrey W; Howard, Andrew W ^[6]; Toyota, Eri ^[7]

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1. Department of Earth and Planetary Sciences, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551 (Japan)
2. Global Edge Institute, Tokyo Institute of Technology, 2-12-1-S6-6 Ookayama, Meguro-ku, Tokyo 152-8550 (Japan)
3. Department of Physics and Astronomy, San Francisco State University, San Francisco, CA 94132 (United States)
4. Department of Physics, Tokai University, 1117 Kitakaname, Hiratsuka, Kanagawa 259-1292 (Japan)
5. Institute for Astronomy, University of Hawaii, Honolulu, HI 96822 (United States)
6. Department of Astronomy, University of California, Berkeley, CA 94720 (United States)
7. Kobe Science Museum, 7-7-6 Minatojima-Nakamachi, Chuo-ku, Kobe, Hyogo 650-0046 (Japan)

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{sub sun} 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{sup -1}, which yield a minimum mass for the companion of 10.7 M{sub 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.

• OSTI ID: 21448739
• Journal Information: Astrophysical Journal, Vol. 715, Issue 1; Other Information: DOI: 10.1088/0004-637X/715/1/550; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
MASS
ORBITS
PLANETS
RADIAL VELOCITY
STARS
TELESCOPES
VELOCITY