Astrophysics> Earth and Planetary Astrophysics
arXiv:0904.4704 (astro-ph)
[Submitted on 29 Apr 2009 (v1), last revised 13 Oct 2009 (this version, v2)]
Title:HAT-P-12b: A Low-Density Sub-Saturn Mass Planet Transiting a Metal-Poor K Dwarf
Authors:J. D. Hartman (1), G. Á. Bakos (1,2), G. Torres (1), Géza Kovács (3), R. W. Noyes (1), A. Pál (1,3,4), D. W. Latham (1), B. Sipöcz (1,4), D. A. Fischer (5), J. A. Johnson (6), G. W. Marcy (7), R. P. Butler (8), A. W. Howard (7), G. A. Esquerdo (1), D. D. Sasselov (1), Gábor Kovács (1), R. P. Stefanik (1), J. M. Fernandez (1,9), J. Lázár (10), I. Papp (10), P. Sári (10), ((1) CfA, (2) NSF Fellow, (3) Konkoly Observatory, (4) ELTE, (5) SFSU, (6) IfA, (7) UC Berkeley, (8) Carnegie Institute of Washington, (9) PUC, (10) Hungarian Astronomical Association)
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Abstract: We report on the discovery of HAT-P-12b, a transiting extrasolar planet orbiting the moderately bright V=12.8 K4 dwarf GSC 03033-00706, with a period P = 3.2130598 +- 0.0000021 d, transit epoch Tc = 2454419.19556 +- 0.00020 (BJD) and transit duration 0.0974 +- 0.0006 d. The host star has a mass of 0.73 +- 0.02 Msun, radius of 0.70 +- ^0.02_0.01 Rsun, effective temperature 4650 +- 60 K and metallicity [Fe/H] = -0.29 +- 0.05. We find a slight correlation between the observed spectral line bisector spans and the radial velocity, so we consider, and rule out, various blend configurations including a blend with a background eclipsing binary, and hierarchical triple systems where the eclipsing body is a star or a planet. We conclude that a model consisting of a single star with a transiting planet best fits the observations, and show that a likely explanation for the apparent correlation is contamination from scattered moonlight. Based on this model, the planetary companion has a mass of 0.211 +- 0.012 MJup, and a radius of 0.959 +- ^0.029_0.021 RJup yielding a mean density of 0.295 +- 0.025 g cm^-3. Comparing these observations with recent theoretical models we find that HAT-P-12b is consistent with a ~ 1-4.5 Gyr, mildly irradiated, H/He dominated planet with a core mass Mc <~ 10 Mearth. HAT-P-12b is thus the least massive H/He dominated gas giant planet found to date. This record was previously held by Saturn.
| Comments: | Accepted for publication in ApJ, 13 pages, 9 figures, 5 tables |
| Subjects: | Earth and Planetary Astrophysics (astro-ph.EP) |
| Cite as: | arXiv:0904.4704 [astro-ph.EP] |
| (or arXiv:0904.4704v2 [astro-ph.EP] for this version) | |
| https://doi.org/10.48550/arXiv.0904.4704
arXiv-issued DOI via DataCite
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| Journal reference: | Astrophys.J.706:785-796,2009 |
| Related DOI: | https://doi.org/10.1088/0004-637X/706/1/785
DOI(s) linking to related resources
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Submission history
From: Joel Hartman [view email][v1] 2009年4月29日 21:17:14 UTC (205 KB)
[v2] 2009年10月13日 13:30:06 UTC (212 KB)
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