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A search for transit timing variations in the HATS-18 planetary system

Southworth, John

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Abstract

HATS-18 b is a transiting planet with a large mass and a short orbital period, and is one of the best candidates for the detection of orbital decay induced by tidal effects. We present extensive photometry of HATS-18 from which we measure 27 times of mid-transit. Two further transit times were measured from data from the Transiting Exoplanet Survey Satellite (TESS) and three more taken from the literature. The transit timings were fitted with linear and quadratic ephemerides and an upper limit on orbital decay was determined. This corresponds to a lower limit on the modified stellar tidal quality factor of $Q_\star ^{\, \prime } \gt 10^{5.11 \pm 0.04}$. This is at the cusp of constraining the presence of enhanced tidal dissipation due to internal gravity waves. We also refine the measured physical properties of the HATS-18 system, place upper limits on the masses of third bodies, and compare the relative performance of TESS and the 1.54 m Danish Telescope in measuring transit times for this system.

Journal Article Type Article
Acceptance Date Jul 5, 2022
Online Publication Date Jul 12, 2022
Publication Date 2022-09
Publicly Available Date Mar 28, 2024
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Publisher Oxford University Press
Peer Reviewed Peer Reviewed
Volume 515
Issue 3
Pages 3212-3223
DOI https://doi.org/10.1093/mnras/stac1931
Keywords Space and Planetary Science, Astronomy and Astrophysics
Publisher URL https://academic.oup.com/mnras/advance-article-abstract/doi/10.1093/mnras/stac1931/6640422?redirectedFrom=PDF&casa_token=Mi3_OZ_Uy1UAAAAA:_A2jOgKYRGegjj-C8jCVNn0kOxZVGGfkKynm08QC1xPU8V_pm7ixwqS9noI-gzZeDfB_NFr0Y0CTq5Tq

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