Szabo, GM, Garai, Z, Brandeker, A, Gandolfi, D, Wilson, TG, Deline, A, Olofsson, G, Fortier, A, Queloz, D, Borsato, L, Kiefer, F, des Etangs, AL, Lendl, M, Serrano, LM, Sulis, S, Moll, SU, Van Grootel, V, Alibert, Y, Alonso, R, Anglada, G, Barczy, T, Barrado Y Navascues, D, Barros, SCC, Baumjohann, W, Beck, M, Beck, T, Benz, W, Billot, N, Bonfanti, A, Bonfils, X, Broeg, C, Cabrera, J, Charnoz, S, Cameron, AC, Csizmadia, S, Davies, MB, Deleuil, M, Delrez, L, Demangeon, O, Demory, B-O, Ehrenreich, D, Erikson, A, Fossati, L, Fridlund, M, Gillon, M, Gudel, M, Heng, K, Hoyer, S, Isaak, KG, Kiss, LL, Laskar, J, Lovis, C, Magrin, D, Maxted, PFL, Mecina, M, Nascimbeni, V, Ottensamer, R, Pagano, I, Palle, E, Peter, G, Piotto, G, Pollacco, D, Ragazzoni, R, Rando, N, Rauer, H, Ribas, I, Santos, NC, Sarajlic, M, Scandariato, G, Segransan, D, Simon, AE, Smith, AMS, Sousa, SG, Steller, M, Thomas, N, Udry, S, Verrecchia, F, Walton, N and Wolter, D (2022) Transit timing variations of AU Microscopii b and c*. Astronomy and Astrophysics, 659. ISSN 0004-6361

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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 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.

Item Type: Article
Additional Information: The final version of this article and all relevant information related to it, including copyrights, can be found on the publisher website
Subjects: Q Science > QB Astronomy
Q Science > QB Astronomy > QB460 Astrophysics
Q Science > QB Astronomy > QB600 Planets. Planetology
Q Science > QB Astronomy > QB799 Stars
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Depositing User: Symplectic
Date Deposited: 14 Apr 2022 08:43
Last Modified: 14 Apr 2022 08:43

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