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CHEOPS photometry from 2024 reveals a reversal in the transit-timing variations of AU Mic c

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arxiv 2608.01120 v1 pith:JXYMJLI4 submitted 2026-08-02 astro-ph.EP

CHEOPS photometry from 2024 reveals a reversal in the transit-timing variations of AU Mic c

Z. Garai , Gy. M. Szab\'o , D. Gandolfi , A. Brandeker , A. Bonfanti , N. Billot , W. Benz , A. Heitzmann
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G. Olofsson L. Kriskovics \'A. Boldog L. Borsato A. Bekkelien G. Bruno H. P. Osborn S. Ulmer-Moll T. G. Wilson Y. Alibert R. Alonso T. B\'arczy D. Barrado S. C. C. Barros W. Baumjohann C. Broeg A. Castro-Gonz\'alez A. Collier Cameron A. C. M. Correia Sz. Csizmadia P. E. Cubillos M. B. Davies M. Deleuil A. Deline O. D. S. Demangeon B.-O. Demory A. Derekas B. Edwards D. Ehrenreich A. Erikson A. Fortier L. Fossati M. Fridlund K. Gazeas M. Gillon M. G\"udel M. N. G\"unther Ch. Helling K. G. Isaak T. Keller L. L. Kiss D. Kitzmann J. Korth K. W. F. Lam J. Laskar A. Lecavelier des Etangs A. Leleu M. Lendl D. Magrin P. F. L. Maxted B. Mer\'in C. Mordasini V. Nascimbeni D. Orikhovskyi R. Ottensamer I. Pagano E. Pall\'e G. Peter D. Piazza G. Piotto D. Pollacco T. Pribulla D. Queloz R. Ragazzoni N. Rando H. Rauer I. Ribas M. Rieder N. C. Santos G. Scandariato D. S\'egransan A. E. Simon A. M. S. Smith S. G. Sousa R. Southworth M. Stalport M. Steinberger S. Sulis S. Udry B. Ulmer V. Van Grootel J. Venturini E. Villaver V. Viotto N. A. Walton
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classification astro-ph.EP
keywords transit-timingcheopscharacteristicmodulationpreviouslyreportedreversalsemi-amplitude
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We present new CHEOPS transit observations of AU Mic b and AU Mic c obtained between June and September 2024, extending the baseline of transit-timing measurements of this young planetary system. For AU Mic b, the timing signal is well established, with a semi-amplitude (10 $\pm$ 3 min) and a characteristic modulation timescale (1168 $\pm$ 20 d) consistent with previous determinations. By contrast, the new CHEOPS data show that the large transit-timing deviation of AU Mic c reported previously was not sustained. After the steadily increasing timing trend observed in 2022 and 2023, the 2024 timings returned closer to the zero point of the observed-minus-calculated diagram, indicating a reversal of the previously reported behavior. For AU Mic c, both the transit-timing semi-amplitude (46 $\pm$ 26 min) and the characteristic modulation timescale (2150 $\pm$ 110 d) remain tentative. These results highlight the importance of continued long-term monitoring of the AU Mic system.

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