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Exploiting timing capabilities of the CHEOPS mission with warm-Jupiter planets

L. Borsato, G. Piotto, D. Gandolfi, V. Nascimbeni, G. Lacedelli, F. Marzari, N. Billot, P. F. L. Maxted, S. G. Sousa, A. C. Cameron, A. Bonfanti, T. G. Wilson, L. M. Serrano, Z. Garai, Y. Alibert, R. Alonso, J. Asquier, T. Bárczy, T. Bandy, D. Barrado, S. C. C. Barros, W. Baumjohann, M. Beck, T. Beck, W. Benz, X. Bonfils, A. Brandeker, C. Broeg, J. Cabrera, S. Charnoz, Sz. Csizmadia, M. B. Davies, M. Deleuil, L. Delrez, O. Demangeon, B.-O. Demory, A. Lecavelier Des Etangs, D. Ehrenreich, A. Erikson, G. Anglada Escudé, A. Fortier, L. Fossati, M. Fridlund, M. Gillon, M. Guedel, J. Hasiba, K. Heng, S. Hoyer, K. G Isaak, L. L. Kiss, E. Kopp, J. Laskar, M. Lendl, C. Lovis, D. Magrin, M. Munari, G. Olofsson, R. Ottensamer, I. Pagano, E. Pallé, G. Peter, D. Pollacco, D. Queloz, R. Ragazzoni, N. Rando, H. Rauer, I. Ribas, D. Ségransan, N. C. Santos, G. Scandariato, A. E. Simon, A. M. S. Smith, M. Steller, Gy. M. Szabó, N. Thomas, S. Udry, V. Van Grootel, N. A. Walton

We present 17 transit light curves of seven known warm-Jupiters observed with the CHaracterising ExOPlanet Satellite (CHEOPS). The light curves have been collected as part of the CHEOPS Guaranteed Time Observation (GTO) program that searches for transit-timing variation (TTV) of warm-Jupiters induced by a possible external perturber to shed light on the evolution path of such planetary systems. We describe the CHEOPS observation process, from the planning to the data analysis. In this work, we focused on the timing performance of CHEOPS, the impact of the sampling of the transit phases, and the improvement we can obtain by combining multiple transits together. We reached the highest precision on the transit time of about 13–16 s for the brightest target (WASP-38, G = 9.2) in our sample. From the combined analysis of multiple transits of fainter targets with G ≥ 11, we obtained a timing precision of ∼2 min. Additional observations with CHEOPS, covering a longer temporal baseline, will further improve the precision on the transit times and will allow us to detect possible TTV signals induced by an external perturber.

techniques: photometric, planets and satellites: individual: HAT-P-17 b, KELT-6 b, WASP-8 b, WASP-38 b, WASP-106 b, WASP-130 b, K2-287 b

Monthly Notices of the Royal Astronomical Society
Volume 506, Issue 3, Page 3810
2021 September

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Faculdade de Ciências da Universidade de Lisboa Universidade do Porto Faculdade de Ciências e Tecnologia da Universidade de Coimbra
Fundação para a Ciência e a Tecnologia COMPETE 2020 PORTUGAL 2020 União Europeia