A search for transit timing variations in the HATS-18 planetary system
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*′ > 105.11±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.
Citation
Southworth , J , Barker , A J , Hinse , T C , Jongen , Y , Dominik , M , Jørgensen , U G , Longa-Peña , P , Sajadian , S , Snodgrass , C , Tregloan-Reed , J , Bach-Møller , N , Bonavita , M , Bozza , V , Burgdorf , M J , Figuera Jaimes , R , Helling , C , Hitchcock , J A , Hundertmark , M , Khalouei , E , Korhonen , H , Mancini , L , Peixinho , N , Rahvar , S , Rabus , M , Skottfelt , J & Spyratos , P 2022 , ' A search for transit timing variations in the HATS-18 planetary system ' , Monthly Notices of the Royal Astronomical Society , vol. 515 , no. 3 , pp. 3212–3223 . https://doi.org/10.1093/mnras/stac1931
Publication
Monthly Notices of the Royal Astronomical Society
Status
Peer reviewed
ISSN
0035-8711Type
Journal article
Rights
Copyright © 2022 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society. This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the final published version of the work, which was originally published at https://doi.org/10.1093/mnras/stac1931.
Description
Funding: AJB was supported by STFC grants ST/S000275/1 and ST/W000873/1. UGJ acknowledges funding from the Novo Nordisk Foundation Interdisciplinary Synergy Programme grant no. NNF19OC0057374 and from the European Union H2020-MSCA-ITN-2019 under Grant no. 860470 (CHAMELEON). PLP was partly funded by Programa de Iniciación en Investigación-Universidad de Antofagasta, INI-17-03. NP’s work was supported by Fundacaão para a Ciência e a Tecnologia (FCT) through the research grants UIDB/04434/2020 and UIDP/04434/2020. This research has received funding from the Europlanet 2024 Research Infrastructure (RI) programme. RI has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No. 871149. This research received financial support from the National Research Foundation (NRF; No. 2019R1I1A1A01059609).Collections
Items in the St Andrews Research Repository are protected by copyright, with all rights reserved, unless otherwise indicated.