Bibcode
Szabó, Gy. M.; Garai, Z.; Brandeker, A.; Gandolfi, D.; Wilson, T. G.; Deline, A.; Olofsson, G.; Fortier, A.; Queloz, D.; Borsato, L.; Kiefer, F.; Lecavelier des Etangs, A.; Lendl, M.; Serrano, L. M.; Sulis, S.; Ulmer Moll, S.; Van Grootel, V.; Alibert, Y.; Alonso, R.; Anglada, G.; Bárczy, T.; Barrado y Navascues, D.; Barros, S. C. C.; Baumjohann, W.; Beck, M.; Beck, T.; Benz, W.; Billot, N.; Bonfanti, A.; Bonfils, X.; Broeg, C.; Cabrera, J.; Charnoz, S.; Collier Cameron, A.; Csizmadia, Sz.; Davies, M. B.; Deleuil, M.; Delrez, L.; Demangeon, O.; Demory, B. -O.; Ehrenreich, D.; Erikson, A.; Fossati, L.; Fridlund, M.; Gillon, M.; Güdel, M.; Heng, K.; Hoyer, S.; Isaak, K. G.; Kiss, L. L.; Laskar, J.; Lovis, C.; Magrin, D.; Maxted, P. F. L.; Mecina, M.; Nascimbeni, V.; Ottensamer, R.; Pagano, I.; Pallé, E.; Peter, G.; Piotto, G.; Pollacco, D.; Ragazzoni, R.; Rando, N.; Rauer, H.; Ribas, I.; Santos, N. C.; Sarajlic, M.; Scandariato, G.; Ségransan, D.; Simon, A. E.; Smith, A. M. S.; Sousa, S. G.; Steller, M.; Thomas, N.; Udry, S.; Verrecchia, F.; Walton, N.; Wolter, D.
Bibliographical reference
Astronomy and Astrophysics
Advertised on:
3
2022
Journal
Citations
10
Refereed citations
9
Description
Here we report large-amplitude transit timing variations (TTVs) for AU Microcopii b and c as detected in combined TESS (2018, 2020) and CHEOPS (2020, 2021) transit observations. AU Mic is a young planetary system with a debris disk and two transiting warm Neptunes. A TTV on the order of several minutes was previously reported for AU Mic b, which was suggested to be an outcome of mutual perturbations between the planets in the system. In 2021, we observed AU Mic b (five transits) and c (three transits) with the CHEOPS space telescope to follow-up the TTV of AU Mic b and possibly detect a TTV for AU Mic c. When analyzing TESS and CHEOPS 2020−2021 measurements together, we find that a prominent TTV emerges with a full span of ≥23 min between the two TTV extrema. Assuming that the period change results from a periodic process -such as mutual perturbations- we demonstrate that the times of transits in the summer of 2022 are expected to be 30−85 min later than predicted by the available linear ephemeris. The CHEOPS data are only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (ftp://130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/cat/J/A+A/659/L7
Related projects
Exoplanets and Astrobiology
The search for life in the universe has been driven by recent discoveries of planets around other stars (known as exoplanets), becoming one of the most active fields in modern astrophysics. The growing number of new exoplanets discovered in recent years and the recent advance on the study of their atmospheres are not only providing new valuable
Enric
Pallé Bago