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Photodynamical analysis of the nearly resonant planetary system WASP-148
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(2022) Photodynamical analysis of the nearly resonant planetary system WASP-148. Astronomy & Astrophysics, 663 . A134. doi:10.1051/0004-6361/202142964 ISSN 0004-6361.
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Official URL: https://doi.org/10.1051/0004-6361/202142964
Abstract
WASP-148 is a recently announced extra-solar system harbouring at least two giant planets. The inner planet transits its host star. The planets travel on eccentric orbits and are near the 4:1 mean-motion resonance, which implies significant mutual gravitational interactions. In particular, this causes transit-timing variations of a few minutes, which were detected based on ground-based photometry. This made WASP-148 one of the few cases where such a phenomenon was detected without space-based photometry. Here, we present a self-consistent model of WASP-148 that takes into account the gravitational interactions between all known bodies in the system. Our analysis simultaneously fits the available radial velocities and transit light curves. In particular, we used the photometry secured by the Transiting Exoplanet Survey Satellite (TESS) and made public after the WASP-148 discovery announcement. The TESS data confirm the transit-timing variations, but only in combination with previously measured transit times. The system parameters we derived agree with those previously reported and have a significantly improved precision, including the mass of the non-transiting planet. We found a significant mutual inclination between the orbital planes of the two planets: I = 41.0+6.2°-7.6 based on the modelling of the observations, although we found I = 20.8 ± 4.6° when we imposed a constraint on the model enforcing long-term dynamical stability. When a third planet was added to the model – based on a candidate signal in the radial velocity – the mutual inclination between planets b and c changed significantly allowing solutions closer to coplanar. We conclude that more data are needed to establish the true architecture of the system. If the significant mutual inclination is confirmed, WASP-148 would become one of the only few candidate non-coplanar planetary systems. We discuss possible origins for this misalignment.
Item Type: | Journal Article | |||||||||||||||||||||||||||||||||
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Subjects: | Q Science > QB Astronomy | |||||||||||||||||||||||||||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | |||||||||||||||||||||||||||||||||
Library of Congress Subject Headings (LCSH): | Planetary systems, Astrometry, Stars -- Motion in line of sight | |||||||||||||||||||||||||||||||||
Journal or Publication Title: | Astronomy & Astrophysics | |||||||||||||||||||||||||||||||||
Publisher: | EDP Sciences | |||||||||||||||||||||||||||||||||
ISSN: | 0004-6361 | |||||||||||||||||||||||||||||||||
Official Date: | 26 July 2022 | |||||||||||||||||||||||||||||||||
Dates: |
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Volume: | 663 | |||||||||||||||||||||||||||||||||
Number of Pages: | 26 | |||||||||||||||||||||||||||||||||
Article Number: | A134 | |||||||||||||||||||||||||||||||||
DOI: | 10.1051/0004-6361/202142964 | |||||||||||||||||||||||||||||||||
Status: | Peer Reviewed | |||||||||||||||||||||||||||||||||
Publication Status: | Published | |||||||||||||||||||||||||||||||||
Access rights to Published version: | Open Access (Creative Commons) | |||||||||||||||||||||||||||||||||
Copyright Holders: | © J. M. Almenara et al. 2022 | |||||||||||||||||||||||||||||||||
Date of first compliant deposit: | 19 August 2022 | |||||||||||||||||||||||||||||||||
Date of first compliant Open Access: | 19 August 2022 | |||||||||||||||||||||||||||||||||
RIOXX Funder/Project Grant: |
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