Transit timing variations of AU Microscopii b and c

Autor(en)

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

Abstrakt

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(en)

Institut für Astrophysik

Externe Organisation(en)

Eötvös Loránd University Budapest, Slovenian Academy of Sciences and Arts, Stockholm University, Università degli Studi di Torino, University of St. Andrews, Universität Genf, Universität Bern, University of Cambridge, INAF - Osservatorio Astronomico di Padova, Université Paris VI - Pierre-et-Marie-Curie, Aix-Marseille Université, Université de Liège, Instituto de Astrofísica de Canarias (IAC), Universidad de La Laguna, Spanish National Research Council (CSIC), Institut d'Estudis Espacials de Catalunya (IEEC), Admatis, European Space Astronomy Centre (ESA), Universidade do Porto, Österreichische Akademie der Wissenschaften (ÖAW), Université 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, European Space Research & Technology Centre (ESA/ESTEC), MTA Társadalomtudományi Kutatóközpont, Université de recherche Paris Sciences et Lettres, Keele University, INAF-Osservatorio Astrofisico di Catania, Università degli Studi di 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

Band

659

Anzahl der Seiten

10

ISSN

0004-6361

DOI

https://doi.org/10.1051/0004-6361/202243076

Publikationsdatum

03-2022

Peer-reviewed

Ja

ÖFOS 2012

103003 Astronomie, 103004 Astrophysik, 103038 Weltraumforschung

Schlagwörter

ASJC Scopus Sachgebiete

Astronomy and Astrophysics, Space and Planetary Science

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/d5abed3a-1c62-462c-90d2-01f3caba68c2