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Title:
The N2K Consortium. II. A Transiting Hot Saturn around HD 149026 with a Large Dense Core
Authors:
Sato, Bun'ei; Fischer, Debra A.; Henry, Gregory W.; Laughlin, Greg; Butler, R. Paul; Marcy, Geoffrey W.; Vogt, Steven S.; Bodenheimer, Peter; Ida, Shigeru; Toyota, Eri; Wolf, Aaron; Valenti, Jeff A.; Boyd, Louis J.; Johnson, John A.; Wright, Jason T.; Ammons, Mark; Robinson, Sarah; Strader, Jay; McCarthy, Chris; Tah, K. L.; Minniti, Dante
Affiliation:
AA(Graduate School of Science and Technology, Kobe University, 1-1 Rokkodai, Nada, Kobe 657-8501, Japan; Okayama Astrophysical Observatory, National Astronomical Observatory, Kamogata, Asakuchi, Okayama 719-0232, Japan ), AB(Department of Physics and Astronomy, San Francisco State University, San Francisco, CA 94132 ), AC(Center of Excellence in Information Systems, Tennessee State University, 330 10th Avenue North, Nashville, TN 37203; also Senior Research Associate, Department of Physics and Astronomy, Vanderbilt University, Nashville, TN 37235.), AD(UCO/Lick Observatory, University of California, Santa Cruz, CA 95064.), AE(Department of Terrestrial Magnetism, Carnegie Institution of Washington, 5241 Broad Branch Road, NW, Washington, DC 20015-1305.), AF(Department of Astronomy, University of California, Berkeley, CA 94720.), AG(UCO/Lick Observatory, University of California, Santa Cruz, CA 95064.), AH(UCO/Lick Observatory, University of California, Santa Cruz, CA 95064.), AI(Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo 152-8551, Japan; and UCO/Lick Observatory, University of California, Santa Cruz, CA 95064.), AJ(Graduate School of Science and Technology, Kobe University, 1-1 Rokkodai, Nada, Kobe 657-8501, Japan.), AK(UCO/Lick Observatory, University of California, Santa Cruz, CA 95064.), AL(Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218.), AM(Fairborn Observatory, HC2 Box 256, Patagonia, AZ 85624.), AN(Department of Astronomy, University of California, Berkeley, CA 94720.), AO(Department of Astronomy, University of California, Berkeley, CA 94720.), AP(UCO/Lick Observatory, University of California, Santa Cruz, CA 95064.), AQ(UCO/Lick Observatory, University of California, Santa Cruz, CA 95064.), AR(UCO/Lick Observatory, University of California, Santa Cruz, CA 95064.), AS(Department of Physics and Astronomy, San Francisco State University, San Francisco, CA 94132 ), AT(Department of Physics and Astronomy, San Francisco State University, San Francisco, CA 94132 ), AU(Department of Astronomy, Pontificia Universidad Católica, Avenida Vicuña Mackenna 4860, Casilla 306, Santiago 200, Chile.)
Publication:
The Astrophysical Journal, Volume 633, Issue 1, pp. 465-473. (ApJ Homepage)
Publication Date:
11/2005
Origin:
UCP
Astronomy Keywords:
Stars: Planetary Systems, stars: individual (HD 149026)
DOI:
10.1086/449306
Bibliographic Code:
2005ApJ...633..465S

Abstract

Doppler measurements from Subaru and Keck have revealed radial velocity variations in the V=8.15, G0 IV star HD 149026 consistent with a Saturn-mass planet in a 2.8766 day orbit. Photometric observations at Fairborn Observatory have detected three complete transit events with depths of 0.003 mag at the predicted times of conjunction. HD 149026 is now the second-brightest star with a transiting extrasolar planet. The mass of the star, based on interpolation of stellar evolutionary models, is 1.3+/-0.1 Msolar together with the Doppler amplitude K1=43.3 m s-1, we derive a planet mass Msini=0.36MJ and orbital radius 0.042 AU. HD 149026 is chromospherically inactive and metal-rich with spectroscopically derived [Fe/H]=+0.36, Teff=6147 K, logg=4.26, and vsini=6.0 km s-1. Based on Teff and the stellar luminosity of 2.72 Lsolar, we derive a stellar radius of 1.45 Rsolar. Modeling of the three photometric transits provides an orbital inclination of 85.3d+/-1.0d and (including the uncertainty in the stellar radius) a planet radius of (0.725+/-0.05)RJ. Models for this planet mass and radius suggest the presence of a ~67 M core composed of elements heavier than hydrogen and helium. This substantial planet core would be difficult to construct by gravitational instability.

Based on data collected at the Subaru Telescope, which is operated by the National Astronomical Observatory of Japan.

Based on observations obtained at the W. M. Keck Observatory, which is operated by the University of California and the California Institute of Technology. Keck time has been granted by NOAO and NASA.


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