Transit timing variations of AU Microscopii b and c
Abstract
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 minutes 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 minutes later than predicted by the available linear ephemeris.
Cite
@article{arxiv.2202.04308,
title = {Transit timing variations of AU Microscopii b and c},
author = {Gy. M. Szabó and Z. Garai and A. Brandeker and D. Gandolfi and T. G. Wilson and A. Deline and G. Olofsson and A. Fortier and D. Queloz and L. Borsato and F. Kiefer and A. Lecavelier des Etangs and M. Lendl and L. M. Serrano and S. Sulis and S. Ulmer Moll and V. Van Grootel and Y. Alibert and R. Alonso and G. Anglada and T. Bárczy and D. Barrado y Navascues and S. C. C. Barros and W. Baumjohann and M. Beck and T. Beck and W. Benz and N. Billot and A. Bonfanti and X. Bonfils and C. Broeg and J. Cabrera and S. Charnoz and A. Collier Cameron and Sz. Csizmadia and M. B. Davies and M. Deleuil and L. Delrez and O. Demangeon and B. -O. Demory and D. Ehrenreich and A. Erikson and L. Fossati and M. Fridlund and M. Gillon and M. Güdel and K. Heng and S. Hoyer and K. G. Isaak and L. L. Kiss and J. Laskar and C. Lovis and D. Magrin and P. F. L. Maxted and M. Mecina and V. Nascimbeni and R. Ottensamer and I. Pagano and E. Pallé and G. Peter and G. Piotto and D. Pollacco and R. Ragazzoni and N. Rando and H. Rauer and I. Ribas and N. C. Santos and M. Sarajlic and G. Scandariato and D. Ségransan and A. E. Simon and A. M. S. Smith and S. Sousa and M. Steller and N. Thomas and S. Udry and F. Verrecchia and N. Walton and D. Wolter},
journal= {arXiv preprint arXiv:2202.04308},
year = {2022}
}
Comments
10 pages, 6 figures, accepted as an A&A Letter