Mass constraints of the WASP-47 planetary system from radial velocities

Sinukoff, Evan and Howard, Andrew W. and Petigura, Erik A. and Fulton, Benjamin J. and Isaacson, Howard and Weiss, Lauren M. and Brewer, John M. and Hansen, Brad M. S. and Hirsch, Lea and Christiansen, Jessie L. and Crepp, Justin R. and Crossfield, Ian J. M. and Schlieder, Joshua E. and Ciardi, David R. and Beichman, Charles A. and Knutson, Heather A. and Benneke, Bjoern and Dressing, Courtney D. and Livingston, John H. and Deck, Katherine M. and Lepine, Sebastien and Rogers, Leslie A. (2017) Mass constraints of the WASP-47 planetary system from radial velocities. The Astronomical Journal, 153 (2). ISSN 0004-6256

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Abstract

We report precise radial velocity (RV) measurements of WASP-47, a G star that hosts three transiting planets in close proximity (a hot Jupiter, a super-Earth, and a Neptune-sized planet) and a non-transiting planet at 1.4 au. Through a joint analysis of previously published RVs and our own Keck-HIRES RVs, we significantly improve the planet mass and bulk density measurements. For the super-Earth WASP-47e (P = 0.79 days), we measure a mass of 9.11 ± 1.17 Ṁ, and a bulk density of 7.63 ± 1.90 g cm-3, consistent with a rocky composition. For the hot Jupiter WASP-47b (P = 4.2 days), we measure a mass of 356 ± 12Ṁ(1.12 ± 0.04 MJup) and constrain its eccentricity to at 3σ confidence. For the Neptune-size planet WASP-47d (P = 9.0 days), we measure a mass of 12.75 ± 50.0 and a bulk density of g cm-3, suggesting that it has a thick H/He envelope. For the outer non-transiting planet, we measure a minimum mass of 411 ±18Ṁ(1.29 ± 0.06 MJup), an orbital period of days, and an orbital eccentricity of . Our new measurements are consistent with but two to four times more precise than previous mass measurements.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Access to published version in accordance with the copyright policy of the publisher.
Faculty / Department / School: No Faculty
Date Deposited: 08 Nov 2017 00:52
Last Modified: 08 Nov 2017 03:36
Uncontrolled Keywords: planetary systems; planets and satellites: detection; dynamical evolution and stability;
Fields of Research : 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020108 Planetary Science (excl. Extraterrestrial Geology)
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
Identification Number or DOI: 10.3847/1538-3881/153/2/70
URI: http://eprints.usq.edu.au/id/eprint/32077

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