Transit timing variations of AU Microscopii b and c

Author(s): Gy M. Szabó, Z. Garai, A. Brandeker, D. Gandolfi, T. G. Wilson, A. Deline, G. Olofsson, A. Fortier, 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. Bárczy, 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. Güdel, 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. Pallé, G. Peter, G. Piotto, D. Pollacco, R. Ragazzoni, N. Rando, H. Rauer, I. Ribas, N. C. Santos, M. Sarajlic, G. Scandariato, D. Ségransan, A. E. Simon, A. M.S. Smith, S. G. Sousa, M. Steller, N. Thomas, S. Udry, F. Verrecchia, N. Walton, D. Wolter
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 2020a 2021 measurements together, we find that a prominent TTV emerges with a full span of a ¥23 min between the two TTV extrema. Assuming that the period change results from a periodic process a such as mutual perturbationsa we demonstrate that the times of transits in the summer of 2022 are expected to be 30a 85 min later than predicted by the available linear ephemeris.
Organisation(s): Department of Astrophysics
External organisation(s): Eötvös Loránd University Budapest, Slovenian Academy of Sciences and Arts, Stockholm University, University of Turin, University of St. Andrews, Université de Genève, Universität Bern, University of Cambridge, Osservatorio Astronomico, Université Paris VI - Pierre-et-Marie-Curie, Aix-Marseille Université, Université de Liège, Institute of Astrophysics of the Canary Islands, University of La Laguna, Spanish National Research Council (CSIC), Institute of Space Studies of Catalonia (IEEC), Admatis Ltd., European Space Astronomy Centre (ESA), Universidade do Porto, Österreichische Akademie der Wissenschaften (ÖAW), University of Grenoble Alpes, Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR), Université Paris VII - Paris-Diderot, Lund University, Leiden University, Chalmers University of Technology, University of Warwick, Science and Operations Department - Science Division (SCI-SC), Eötvös Loránd Research Network, Université de recherche Paris Sciences et Lettres, Keele University, INAF-Osservatorio Astrofisico di Catania, University of Padova, Technische Universität Berlin, Freie Universität Berlin (FU), Space Science Data Center (SSDC) - Agenzia Spaziale Italiana (ASI), INAF - Osservatorio Astronomico di Roma
Journal: Astronomy and Astrophysics
Volume: 659
No. of pages: 10
ISSN: 0004-6361
DOI: https://doi.org/10.1051/0004-6361/202243076
Publication date: 03-2022
Peer reviewed: Yes
Austrian Fields of Science 2012: 103003 Astronomy, 103004 Astrophysics, 103038 Space exploration
Keywords
ASJC Scopus subject areas: Astronomy and Astrophysics, Space and Planetary Science
Portal url: https://ucrisportal.univie.ac.at/en/publications/d5abed3a-1c62-462c-90d2-01f3caba68c2

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