J/A+A/659/L7ivo://CDS.VizieR/J/A+A/659/L7doi:10.26093/cds/vizier.36599007CDSSzabo Gy.M.Garai Z.Brandeker A.Gandolfi D.Wilson T.G.Deline A.,Olofsson G.Fortier A.Queloz D.Borsato L.Kiefer F.,Lecavelier des Etangs A.Lendl M.Serrano L.M.Sulis S.Ulmer Moll S.,Van Grootel V.Alibert Y.Alonso R.Anglada G.Barczy T.,Barrado y Navascues D.Barros S.C.C.Baumjohann W.Beck M.Beck T.,Benz W.Billot N.Bonfanti A.Bonfils X.Broeg C.Cabrera J.,Charnoz S.Collier Cameron A.Csizmadia Sz.Davies M.B.Deleuil M.,Delrez L.Demangeon O.Demory B.-O.Ehrenreich D.Erikson A.,Fossati L.Fridlund M.Gillon M.Guedel M.Heng K.Hoyer S.,Isaak K.G.Kiss L.L.Laskar J.Lovis C.Magrin D.Maxted P.F.L.,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 N.C.Sarajlic M.Scandariato G.Segransan D.Simon A.E.,Smith A.M.S.Sousa S.G.Steller M.Thomas N.Udry S.Verrecchia F.,Walton N.Wolter D.2022-09-06T14:20:22Z2022-03-10T08:18:04ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frmultiple-starsexoplanetsphotometryvisible-astronomyHere 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 minutes 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 minutes later than predicted by the available linear ephemeris.2022A&A...659L...7Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/659/L7CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+A/595/A31 : SAM detection limits of 8 debris disks (Gauchet+, 2016)J/AJ/162/137 : Minerva-Australis radial velocity of AU Mic (Addison+, 2021)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/659/L7https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/659/L7http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/659/L7https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/659/L7https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/659/L7http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/659/L7GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/A+A/659/L7/aumic_bCHEOPS photometry of Au Mic b transits in 2021recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDCHEOPS barycentric Julian datedtime.epochdoubleFluxRelative fluxphot.flux;arith.ratiodoubleJ/A+A/659/L7/aumic_cCHEOPS photometry of Au Mic c transits in 2021recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDCHEOPS barycentric Julian datedtime.epochdoubleFluxRelative fluxphot.flux;arith.ratiodouble