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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\u22122021 measurements together, we find that a prominent TTV emerges with a full span of \u226523 min between the two TTV extrema. Assuming that the period change results from a periodic process \u2013such as mutual perturbations\u2013 we demonstrate that the times of transits in the summer of 2022 are expected to be 30\u221285 min later than predicted by the available linear ephemeris.<\/jats:p>","DOI":"10.1051\/0004-6361\/202243076","type":"journal-article","created":{"date-parts":[[2022,2,11]],"date-time":"2022-02-11T19:54:40Z","timestamp":1644609280000},"page":"L7","source":"Crossref","is-referenced-by-count":20,"title":["Transit timing variations of AU Microscopii b and c"],"prefix":"10.1051","volume":"659","author":[{"given":"Gy. M.","family":"Szab\u00f3","sequence":"first","affiliation":[]},{"given":"Z.","family":"Garai","sequence":"additional","affiliation":[]},{"given":"A.","family":"Brandeker","sequence":"additional","affiliation":[]},{"given":"D.","family":"Gandolfi","sequence":"additional","affiliation":[]},{"given":"T. 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