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HAT-P-44b, HAT-P-45b, and HAT-P-46b: Three Transiting Hot Jupiters in Possible Multi-planet Systems

Hartman, J. D. and Johnson, J. A. and Howard, A. W. and Shporer, A. and Fulton, B. J. (2014) HAT-P-44b, HAT-P-45b, and HAT-P-46b: Three Transiting Hot Jupiters in Possible Multi-planet Systems. Astronomical Journal, 147 (6). Art. No. 128. ISSN 0004-6256. doi:10.1088/0004-6256/147/6/128.

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We report the discovery by the HATNet survey of three new transiting extrasolar planets orbiting moderately bright (V = 13.2, 12.8, and 11.9) stars. The planets have orbital periods of 4.3012, 3.1290, and 4.4631 days, masses of 0.35, 0.89, and 0.49 M_J, and radii of 1.24, 1.43, and 1.28 R_J. The stellar hosts have masses of 0.94, 1.26, and 1.28 M_☉. Each system shows significant systematic variations in its residual radial velocities, indicating the possible presence of additional components. Based on its Bayesian evidence, the preferred model for HAT-P-44 consists of two planets, including the transiting component, with the outer planet having a period of 872 days, eccentricity of 0.494 ± 0.081, and a minimum mass of 4.0 M_J. Due to aliasing we cannot rule out alternative solutions for the outer planet having a period of 220 days or 438 days. For HAT-P-45, at present there is not enough data to justify the additional free parameters included in a multi-planet model; in this case a single-planet solution is preferred, but the required jitter of 22.5 ± 6.3 m s^(–1) is relatively high for a star of this type. For HAT-P-46 the preferred solution includes a second planet having a period of 78 days and a minimum mass of 2.0 M_J, however the preference for this model over a single-planet model is not very strong. While substantial uncertainties remain as to the presence and/or properties of the outer planetary companions in these systems, the inner transiting planets are well characterized with measured properties that are fairly robust against changes in the assumed models for the outer planets. Continued radial velocity monitoring is necessary to fully characterize these three planetary systems, the properties of which may have important implications for understanding the formation of hot Jupiters.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Hartman, J. D.0000-0001-8732-6166
Johnson, J. A.0000-0001-9808-7172
Howard, A. W.0000-0001-8638-0320
Shporer, A.0000-0002-1836-3120
Fulton, B. J.0000-0003-3504-5316
Additional Information:© 2014 American Astronomical Society. Received 2013 August 13; accepted 2014 March 10; published 2014 April 24. HATNet operations have been funded in part by NASA grants NNG04GN74G, NNX08AF23G, and NNX13AJ15G. J.D.H., G.Á.B., and W.B. received partial support from NSF grant AST-1108686. G.Á.B., Z.C., and K.P. acknowledge partial support from NASA grant NNX09AB29G. G.T. acknowledges partial support from NASA grant NNX09AF59G. We acknowledge partial support also from the Kepler 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-81373. This research has made use of Keck telescope time granted through NOAO (program A284Hr) and NASA (N154Hr, N108Hr). This paper uses observations obtained with facilities of the Las Cumbres Observatory Global Telescope. Data presented in this paper are based on observations obtained at the HAT station at the Submillimeter Array of SAO, and the HAT station at the Fred Lawrence Whipple Observatory of SAO. We also thank Mount Stromlo Observatory and Siding Spring Observatory for granting us time on the ANU 2.3 m telescope. This research has made use of the Exoplanet Orbit Database and the Exoplanet Data Explorer at
Funding AgencyGrant Number
Hungarian Scientific Research Foundation (OTKA)K-81373
National Optical Astronomy Observatory (NOAO)A284Hr
Subject Keywords:planetary systems; stars: individual (HAT-P-44, HAT-P-45, HAT-P-46); techniques: photometric; techniques: spectroscopic
Issue or Number:6
Record Number:CaltechAUTHORS:20140619-151037139
Persistent URL:
Official Citation:HAT-P-44b, HAT-P-45b, and HAT-P-46b: Three Transiting Hot Jupiters in Possible Multi-planet Systems J. D. Hartman et al. 2014 The Astronomical Journal 147 128
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:46372
Deposited By: Ruth Sustaita
Deposited On:20 Jun 2014 16:35
Last Modified:10 Nov 2021 17:24

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