@misc{10481/75203,
year = {2022},
month = {4},
url = {http://hdl.handle.net/10481/75203},
abstract = {Rapidly rotating early-type main-sequence stars with transiting planets are interesting in many aspects. Unfortunately, several astrophysical effects in such systems are not well understood yet. Therefore, we performed a photometric mini-surv e y of three rapidly rotating stars with transiting planets, namely KEL T -17b, KEL T -19Ab, and KEL T -21b, using the Characterising Exoplanets Satellite ( CHEOPS ), complemented with Transiting Exoplanet Survey Satellite ( TESS ) data, and spectroscopic data. We aimed at investigating the spin-orbit misalignment and its photometrical signs, therefore the high-quality light curves of the selected objects were tested for transit asymmetry, transit duration variations, and orbital precession. In addition, we performed transit time variation analyses, obtained new stellar parameters, and refined the system parameters. For KEL T -17b and KEL T - 19Ab, we obtained significantly smaller planet radius as found before. The gravity-darkening effect is very small compared to the precision of CHEOPS data. We can report only on a tentative detection of the stellar inclination of KEL T -21, which is about 60 deg. In KEL T -17b and KEL T -19Ab, we were able to exclude long-term transit duration variations causing orbital precession. The shorter transit duration of KEL T -19Ab compared to the disco v ery paper is probably a consequence of a smaller planet radius. KEL T -21b is promising from this viewpoint, but further precise observations are needed. We did not find any convincing evidence for additional objects in the systems.},
organization = {National Research, Development & Innovation Office (NRDIO) - Hungary	K-125015},
organization = {ELTE University	4000137122},
organization = {European Space Agency
European Commission	4000137122	
ESA-D/SCI-LE-2021-0025},
organization = {City of Szombathely	67.177-21/2016},
organization = {Slovak Academy of Sciences	2/0031/22	
Slovak Research and Development Agency	APVV-20-0148},
organization = {Spanish Government	SEV-2017-0709},
organization = {CHEOPS Guest Observers Programme	1 (AO-1)},
organization = {Science Operations Centre},
organization = {National Aeronautics & Space Administration (NASA)		
NAS 526555},
publisher = {Oxford University Press},
keywords = {Methods: observational},
keywords = {Techniques: photometric},
keywords = {Techniques: spectroscopic},
keywords = {Planets and satellites: individual: KELT-17b, KELT-19Ab, KELT-21b},
title = {Rapidly rotating stars and their transiting planets: KELT-17b, KELT-19Ab, and KELT-21b in the CHEOPS and TESS era},
doi = {10.1093/mnras/stac1095},
author = {Garai, Z. and Claret, A.},
}