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MASS CONSTRAINTS OF THE WASP-47 PLANETARY SYSTEM FROM RADIAL VELOCITIES
- Sinukoff, Evan;
- Howard, Andrew W;
- Petigura, Erik A;
- Fulton, Benjamin J;
- Isaacson, Howard;
- Weiss, Lauren M;
- Brewer, John M;
- Hansen, Brad MS;
- Hirsch, Lea;
- Christiansen, Jessie L;
- Crepp, Justin R;
- Crossfield, Ian JM;
- Schlieder, Joshua E;
- Ciardi, David R;
- Beichman, Charles A;
- Knutson, Heather A;
- Benneke, Bjoern;
- Dressing, Courtney D;
- Livingston, John H;
- Deck, Katherine M;
- Lépine, Sébastien;
- Rogers, Leslie A
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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