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HAT-P-11b: A Super-Neptune Planet Transiting a Bright K Star in the Kepler Field

Bakos, G. Á. and Torres, G. and Pál, A. and Hartman, J. and Kovács, Géza and Noyes, R. W. and Latham, D. W. and Sasselov, D. D. and Sipőcz, B. and Esquerdo, G. A. and Fischer, D. A. and Johnson, J. A. and Marcy, G. W. and Butler, R. P. and Isaacson, H. and Vogt, S. and Kovács, Gábor and Fernandez, J. and Moόr, A. and Stefanik, R. P. and Lázár, J. and Papp, I. and Sári, P. and Howard, A. (2010) HAT-P-11b: A Super-Neptune Planet Transiting a Bright K Star in the Kepler Field. Astrophysical Journal, 710 (2). pp. 1724-1745. ISSN 0004-637X.

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We report on the discovery of HAT-P-11b, the smallest radius transiting extrasolar planet (TEP) discovered from the ground, and the first hot Neptune discovered to date by transit searches. HAT-P-11b orbits the bright (V = 9.587) and metal rich ([Fe/H] = +0.31 ± 0.05) K4 dwarf star GSC 03561-02092 with P = 4.8878162 ± 0.0000071 days and produces a transit signal with depth of 4.2 mmag, the shallowest found by transit searches that is due to a confirmed planet. We present a global analysis of the available photometric and radial velocity (RV) data that result in stellar and planetary parameters, with simultaneous treatment of systematic variations. The planet, like its near-twin GJ 436b, is somewhat larger than Neptune (17 M_⊕, 3.8 R_⊕) both in mass M_p = 0.081 ± 0.009 M_J(25.8 ± 2.9 M_⊕) and radius R_p = 0.422 ± 0.014 R_J(4.73 ± 0.16 R_⊕). HAT-P-11b orbits in an eccentric orbit with e = 0.198 ± 0.046 and ω = 355º.2 ± 17º.3, causing a reflex motion of its parent star with amplitude 11.6 ± 1.2 ms^(–1), a challenging detection due to the high level of chromospheric activity of the parent star. Our ephemeris for the transit events is T_c = 2454605.89132 ± 0.00032 (BJD), with duration 0.0957 ± 0.0012 days, and secondary eclipse epoch of 2454608.96 ± 0.15 days (BJD). The basic stellar parameters of the host star are M_★ = 0.809^(+0.020)_(–0.027) M_☉, R_★ = 0.752 ± 0.021 R_☉, and T_(eff★) = 4780 ± 50 K. Importantly, HAT-P-11 will lie on one of the detectors of the forthcoming Kepler mission; this should make possible fruitful investigations of the detailed physical characteristic of both the planet and its parent star at unprecedented precision. We discuss an interesting constraint on the eccentricity of the system by the transit light curve and stellar parameters. This will be particularly useful for eccentric TEPs with low-amplitude RV variations in Kepler's field. We also present a blend analysis, that for the first time treats the case of a blended transiting hot Jupiter mimicking a transiting hot Neptune, and proves that HAT-P-11b is not such a blend.

Item Type:Article
Related URLs:
URLURL TypeDescription
Torres, G.0000-0002-5286-0251
Latham, D. W.0000-0001-9911-7388
Marcy, G. W.0000-0002-2909-0113
Isaacson, H.0000-0002-0531-1073
Howard, A.0000-0001-8638-0320
Additional Information:© 2010 American Astronomical Society. Received 2008 December 30; accepted 2010 January 11; published 2010 February 2. 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 (A285Hr) and NASA (N128Hr). HATNet operations have been funded by NASA grants NEG04GN74G, NNX08AF23G, and SAO IR&D grants. Work by G.Á.B. and J.A.J. was supported by Postdoctoral Fellowships of the NSF Astronomy and Astrophysics Program (AST-0702843 and AST-0702821, respectively). We also acknowledge partial support from theKepler Mission under NASA Cooperative Agreement NCC2-1390 (PI: D.W.L.). G.K. thanks the Hungarian Scientific Research Foundation (OTKA) for support through grant K-60750. This research has made use of Keck telescope time granted through NOAO (program A285Hr) and NASA (N128Hr). Data presented herein were obtained at the W. M. Keck Observatory from telescope time allocated to NASA through the agency’s scientific partnership with the California Institute of Technology and the University of California. The Observatory was made possible by the generous financial support of the W. M. Keck Foundation.
Funding AgencyGrant Number
Smithsonian Astrophysical ObservatoryUNSPECIFIED
NSF Astronomy and Astrophysics FellowshipAST-0702843
NSF Astronomy and Astrophysics FellowshipAST-0702821
Hungarian Scientific Research Fund (OTKA)K-60750
W. M. Keck FoundationUNSPECIFIED
Subject Keywords:planetary systems; stars: individual (HAT-P-11, GSC 03561-02092); techniques: photometric; techniques: spectroscopic
Issue or Number:2
Record Number:CaltechAUTHORS:20130107-100501627
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Official Citation:HAT-P-11b: A Super-Neptune Planet Transiting a Bright K Star in the Kepler Field G. Á. Bakos et al. 2010 ApJ 710 1724
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:36195
Deposited By: Ruth Sustaita
Deposited On:07 Jan 2013 18:38
Last Modified:03 Oct 2019 04:35

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