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HAT-P-24b: An Inflated Hot Jupiter on a 3.36 Day Period Transiting a Hot, Metal-poor Star

Kipping, D. M. and Bakos, G. Á. and Hartman, J. and Torres, G. and Shporer, A. and Latham, D. W. and Kovács, Géza and Noyes, R. W. and Howard, A. W. and Fischer, D. A. and Johnson, J. A. and Marcy, G. W. and Béky, B. and Perumpilly, G. and Esquerdo, G. A. and Sasselov, D. D. and Stefanik, R. P. and Lázár, J. and Papp, I. and Sári, P. (2010) HAT-P-24b: An Inflated Hot Jupiter on a 3.36 Day Period Transiting a Hot, Metal-poor Star. Astrophysical Journal, 725 (2). pp. 2017-2028. ISSN 0004-637X.

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We report the discovery of HAT-P-24b, a transiting extrasolar planet orbiting the moderately bright V = 11.818 F8 dwarf star GSC 0774−01441, with a period P = 3.3552464 ± 0.0000071 days, transit epoch T_c = 2455216.97669 ± 0.00024 (BJD)11, and transit duration 3.653 ± 0.025 hr. The host star has a mass of 1.191 ± 0.042M_⊙, radius of 1.317 ± 0.068R_⊙, effective temperature 6373 ± 80 K, and a low metallicity of [Fe/H] = −0.16 ± 0.08. The planetary companion has a mass of 0.681 ± 0.031 M_J and radius of 1.243 ± 0.072 R_J yielding a mean density of 0.439 ± 0.069 g cm^(−3). By repeating our global fits with different parameter sets, we have performed a critical investigation of the fitting techniques used for previous Hungarian-made Automated Telescope planetary discoveries. We find that the system properties are robust against the choice of priors. The effects of fixed versus fitted limb darkening are also examined. HAT-P-24b probably maintains a small eccentricity of e = 0.052^(+0.022)_(−0.017), which is accepted over the circular orbit model with false alarm probability 5.8%. In the absence of eccentricity pumping, this result suggests that HAT-P-24b experiences less tidal dissipation than Jupiter. Due to relatively rapid stellar rotation, we estimate that HAT-P-24b should exhibit one of the largest known Rossiter–McLaughlin effect amplitudes for an exoplanet (ΔV_(RM) ≃ 95 m s^(−1)) and thus a precise measurement of the sky-projected spin–orbit alignment should be possible.

Item Type:Article
Related URLs:
URLURL TypeDescription
Bakos, G. Á.0000-0001-7204-6727
Torres, G.0000-0002-5286-0251
Shporer, A.0000-0002-1836-3120
Latham, D. W.0000-0001-9911-7388
Howard, A. W.0000-0001-8638-0320
Fischer, D. A.0000-0003-2221-0861
Johnson, J. A.0000-0001-9808-7172
Marcy, G. W.0000-0002-2909-0113
Esquerdo, G. A.0000-0002-9789-5474
Sasselov, D. D.0000-0001-7014-1771
Additional Information:© 2010 American Astronomical Society. Received 2010 August 1, accepted 2010 October 11. Published 2010 December 3. Based in part 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. HATNet operations have been funded by NASA grants NNG04GN74G, NNX08AF23G and SAO IR&D grants. DK was supported by STFC and as an SAO Predoctoral Fellow. Work of G. Á. B. and J. Johnson were supported by the Postdoctoral Fellowship of the NSF Astronomy and Astrophysics Program (AST-0702843 and AST-0702821, respectively). GT acknowledges partial support from NASA grant NNX09AF59G. We acknowledge partial support also from the Kepler Mission under NASA Cooperative Agreement NCC2-1390 (D.W.L., PI). G.K. thanks the Hungarian Scientific Research Foundation (OTKA) for support through grant K-81373. This research has made use of Keck telescope time granted through NOAO and NASA. This paper uses observations obtained with facilities of the Las Cumbres Observatory Global Telescope.
Funding AgencyGrant Number
Smithsonian Astrophysical ObservatoryUNSPECIFIED
NSF Astronomy and Astrophysics FellowshipAST-0702843
NSF Astronomy and Astrophysics FellowshipAST-0702821
Hungarian Scientific Research Fund (OTKA)K-81373
Science and Technology Facilities Council (STFC)UNSPECIFIED
Subject Keywords:planetary systems; stars: individual (HAT-P-24); techniques: photometric; techniques: spectroscopic
Issue or Number:2
Classification Code:PACS: 97.82.-j; 95.85.Kr; 97.20.Tr; 95.10.Gi; 97.20.Ge
Record Number:CaltechAUTHORS:20110310-100114723
Persistent URL:
Official Citation:D. M. Kipping et al. 2010 ApJ 725 2017 doi: 10.1088/0004-637X/725/2/2017
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:22804
Deposited By: Ruth Sustaita
Deposited On:10 Mar 2011 21:34
Last Modified:09 Mar 2020 13:19

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