From: LARRY KLAES (ljk4_at_msn.com)
Date: Wed Oct 03 2007 - 05:58:44 PDT
HAT-P-4b: A metal-rich low-density transiting hot Jupiter
Authors: G. Kovacs (1), G. A. Bakos (2,3), G. Torres (2), A. Sozzetti (2,4),
D. W. Latham (2), R. W. Noyes (2), R. P. Butler (5), G. W. Marcy (6), D. A.
Fischer (7), J. M. Fernandez (2), G. Esquerdo (2), D. D. Sasselov (2), R. P.
Stefanik (2), A. Pal (8), J. Lazar (9), I. Papp (9), P. Sari (9) ((1)
Konkoly Observatory, (2) CfA, (3) Hubble Fellow, (4) INAF - Osservatorio
Astronomico di Torino, (5) Department of Terrestrial Magnetism, Carnegie
Institute of Washington DC, (6) Department of Astronomy, University of
California, Berkeley (7) Department of Physics & Astronomy, San Francisco
State University (8) Department of Astronomy, Eötvös Loránd University, (9)
Hungarian Astronomical Association)
(Submitted on 2 Oct 2007)
Abstract: We describe the discovery of HAT-P-4b, a low-density extrasolar
planet transiting BD+36 2593, a V = 11.2 mag slightly evolved metal-rich
late F star. The planet’s orbital period is 3.056536+/-0.000057 d with a
mid-transit epoch of 2,454,245.8154 +/- 0.0003 (HJD). Based on
high-precision photometric and spectroscopic data, and by using transit
light curve modeling, spectrum analysis and evolutionary models, we derive
the following planet parameters: Mp= 0.68 +/- 0.04 MJ, Rp= 1.27 +/- 0.05 RJ,
rho = 0.41 +/- 0.06 g cm-3 and a = 0.0446 +/- 0.0012 AU. Because of its
relatively large radius, together with its assumed high metallicity of that
of its parent star, this planet adds to the theoretical challenges to
explain inflated extrasolar planets.
Comments: 5 pages, accepted for publication in ApJL
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:0710.0602v1 [astro-ph]
Submission history
From: Gaspar Bakos A [view email]
[v1] Tue, 2 Oct 2007 19:05:36 GMT (76kb)
http://arxiv.org/abs/0710.0602
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