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Revisiting WASP-47 with ESPRESSO and TESS
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Bryant, Edward M. and Bayliss, Daniel D. R. (2022) Revisiting WASP-47 with ESPRESSO and TESS. The Astronomical Journal, 163 (5). 197. doi:10.3847/1538-3881/ac58ff ISSN 1538-3881.
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Official URL: https://doi.org/10.3847/1538-3881/ac58ff
Abstract
WASP-47 hosts a remarkable planetary system containing a hot Jupiter (WASP-47 b; P = 4.159 days) with an inner super-Earth (WASP-47 e; P = 0.7896 days), a close-orbiting outer Neptune (WASP-47 d; P = 9.031 days), and a long-period giant planet (WASP-47 c; P = 588.4 days). We use the new Transiting Exoplanet Survey Satellite (TESS) photometry to refine the orbital ephemerides of the transiting planets in the system, particularly the hot Jupiter WASP-47 b, for which we find an update equating to a 17.4 minute shift in the transit time. We report new radial-velocity measurements from the Echelle SPectrograph for Rocky Exoplanets and Stable Spectroscopic Observations (ESPRESSO) spectrograph for WASP-47, which we use to refine the masses of WASP-47 d and WASP-47 e, with a high-cadence observing strategy aimed to focus on the super-Earth WASP-47 e. We detect a periodic modulation in the K2 photometry that corresponds to a 32.5 ± 3.9 day stellar rotation, and find further stellar activity signals in our ESPRESSO data consistent with this rotation period. For WASP-47 e we measure a mass of 6.77 ± 0.57 M ⊕ and a bulk density of 6.29 ± 0.60 g cm−3, giving WASP-47 e the second most precisely measured density to date of any super-Earth. The mass and radius of WASP-47 e, combined with the exotic configuration of the planetary system, suggest the WASP-47 system formed through a mechanism different to systems with multiple small planets or more typical isolated hot Jupiters.
| Item Type: | Journal Article | ||||||
|---|---|---|---|---|---|---|---|
| Subjects: | Q Science > QB Astronomy | ||||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||
| SWORD Depositor: | Library Publications Router | ||||||
| Library of Congress Subject Headings (LCSH): | Extrasolar planets, Planetary systems, Transits, Astronomical photometry | ||||||
| Journal or Publication Title: | The Astronomical Journal | ||||||
| Publisher: | The American Astronomical Society | ||||||
| ISSN: | 1538-3881 | ||||||
| Official Date: | 6 April 2022 | ||||||
| Dates: |
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| Volume: | 163 | ||||||
| Number: | 5 | ||||||
| Article Number: | 197 | ||||||
| DOI: | 10.3847/1538-3881/ac58ff | ||||||
| Status: | Peer Reviewed | ||||||
| Publication Status: | Published | ||||||
| Access rights to Published version: | Open Access (Creative Commons) | ||||||
| Date of first compliant deposit: | 15 November 2022 | ||||||
| Date of first compliant Open Access: | 15 November 2022 | ||||||
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