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Transit timing variations of AU Microscopii b and c

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arxiv 2202.04308 v1 pith:DXJFCZZQ submitted 2022-02-09 astro-ph.EP

Transit timing variations of AU Microscopii b and c

Gy. M. Szab\'o , Z. Garai , A. Brandeker , D. Gandolfi , T. G. Wilson , A. Deline , G. Olofsson , A. Fortier
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D. Queloz L. Borsato F. Kiefer A. Lecavelier des Etangs M. Lendl L. M. Serrano S. Sulis S. Ulmer Moll V. Van Grootel Y. Alibert R. Alonso G. Anglada T. B\'arczy D. Barrado y Navascues S. C. C. Barros W. Baumjohann M. Beck T. Beck W. Benz N. Billot A. Bonfanti X. Bonfils C. Broeg J. Cabrera S. Charnoz A. Collier Cameron Sz. Csizmadia M. B. Davies M. Deleuil L. Delrez O. Demangeon B.-O. Demory D. Ehrenreich A. Erikson L. Fossati M. Fridlund M. Gillon M. G\"udel K. Heng S. Hoyer K. G. Isaak L. L. Kiss J. Laskar C. Lovis D. Magrin P. F. L. Maxted M. Mecina V. Nascimbeni R. Ottensamer I. Pagano E. Pall\'e G. Peter G. Piotto D. Pollacco R. Ragazzoni N. Rando H. Rauer I. Ribas N. C. Santos M. Sarajlic G. Scandariato D. S\'egransan A. E. Simon A. M. S. Smith S. Sousa M. Steller N. Thomas S. Udry F. Verrecchia N. Walton D. Wolter
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keywords cheopsminutestransittransitsmutualperturbationssystemtess
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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.

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