{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,5]],"date-time":"2026-05-05T18:33:04Z","timestamp":1778005984658,"version":"3.51.4"},"reference-count":64,"publisher":"EDP Sciences","license":[{"start":{"date-parts":[[2022,12,13]],"date-time":"2022-12-13T00:00:00Z","timestamp":1670889600000},"content-version":"vor","delay-in-days":12,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["A&amp;A"],"accepted":{"date-parts":[[2022,10,16]]},"published-print":{"date-parts":[[2022,12]]},"abstract":"<jats:p><jats:italic>Context.<\/jats:italic> A tidal interaction between a star and a close-in exoplanet leads to shrinkage of the planetary orbit and eventual tidal dis- ruption of the planet. Measuring the shrinkage of the orbits will allow for the tidal quality parameter of the star (<jats:italic>Q<\/jats:italic><jats:sub>\u2605<\/jats:sub><jats:sup>\u2032<\/jats:sup>) to be measured, which is an important parameter to obtain information about stellar interiors.<\/jats:p>\n<jats:p><jats:italic>Aims.<\/jats:italic> We analyse data from the Transiting Exoplanet Survey Satellite (TESS) for two targets known to host close-in hot Jupiters, which have significant data available and are expected to have a fast decay: WASP-18 and WASP-19. We aim to measure the current limits on orbital period variation and provide new constrains on <jats:italic>Q<\/jats:italic><jats:sub>\u2605<\/jats:sub><jats:sup>\u2032<\/jats:sup> for our targets.<\/jats:p>\n<jats:p><jats:italic>Methods.<\/jats:italic> We modelled the transit shape using all the available TESS observations and fitted the individual transit times of each tran- sit. We used previously published transit times together with our results to fit two models, a constant period model, and a quadratic orbital decay model, using Markov chain Monte Carlo (MCMC) algorithms.<\/jats:p>\n<jats:p><jats:italic>Results.<\/jats:italic> We obtain new constrains on <jats:italic>Q<\/jats:italic><jats:sub>\u2605<\/jats:sub><jats:sup>\u2032<\/jats:sup> for both targets and improve the precision of the known planet parameters with the newest observations from TESS. We find period change rates of (\u22120.11 \u00b1 0.21) \u00d7 10<jats:sup>\u221210<\/jats:sup> for WASP-18b and (\u22120.35 \u00b1 0.22) \u00d7 10<jats:sup>\u221210<\/jats:sup> for WASP-19b and we do not find significant evidence of orbital decay in these targets. We obtain new lower limits for <jats:italic>Q<\/jats:italic><jats:sub>\u2605<\/jats:sub><jats:sup>\u2032<\/jats:sup> of (1.42 \u00b1 0.34) \u00d7 10<jats:sup>7<\/jats:sup> in WASP-18 and (1.26 \u00b1 0.10) \u00d7 10<jats:sup>6<\/jats:sup> in WASP-19, corresponding to upper limits of the orbital decay rate of \u22120.45 \u00d7 10<jats:sup>\u221210<\/jats:sup> and \u22120.71 \u00d7 10<jats:sup>\u221210<\/jats:sup>, respectively, with a 95% confidence level. We compare our results with other relevant targets for tidal decay studies.<\/jats:p>\n<jats:p><jats:italic>Conclusions.<\/jats:italic> We find that the orbital decay rate in both WASP-18b and WASP-19b appears to be smaller than the measured orbital decay of WASP-12b. We show that the minimum value of <jats:italic>Q<\/jats:italic><jats:sub>\u2605<\/jats:sub><jats:sup>\u2032<\/jats:sup> in WASP-18 is two orders of magnitude higher than that of WASP-12, while WASP-19 has a minimum value one order of magnitude higher, which is consistent with other similar targets. Further observations are required to constrain the orbital decay of WASP-18 and WASP-19.<\/jats:p>","DOI":"10.1051\/0004-6361\/202244513","type":"journal-article","created":{"date-parts":[[2022,10,28]],"date-time":"2022-10-28T18:53:22Z","timestamp":1666983202000},"page":"A114","source":"Crossref","is-referenced-by-count":19,"title":["Measuring the orbit shrinkage rate of hot Jupiters due to tides"],"prefix":"10.1051","volume":"668","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8588-6730","authenticated-orcid":false,"given":"N. M.","family":"Ros\u00e1rio","sequence":"first","affiliation":[]},{"given":"S. C. C.","family":"Barros","sequence":"additional","affiliation":[]},{"given":"O. D. 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