2022A&A...659L...7S

Query : 2022A&A...659L...7S

2022A&A...659L...7S - Astronomy and Astrophysics, volume 659, L7-7 (2022/3-1)

Transit timing variations of AU Microscopii b and c.

SZABO G.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 S., DAVIES M.B., 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 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. and WOLTER D.

Abstract (from CDS):

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.

Abstract Copyright: © ESO 2022

Journal keyword(s): planets and satellites: fundamental parameters - planets and satellites: individual: AU Mic b and c

VizieR on-line data: <Available at CDS (J/A+A/659/L7): aumic_b.dat aumic_c.dat>

Simbad objects: 6

Full paper

View the references in ADS

Number of rows : 6

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag B	Mag V	Mag R	Mag I	Sp type	#ref 1850 - 2024	#notes
1	NAME beta Pic Moving Group	MGr	14 30	-42.0					~	774	0
2	Kepler-25b	Pl	19 06 33.2141354736	+39 29 16.358725104					~	66	1
3	Kepler-1530c	Pl	19 12 38.9945446080	+48 09 54.506254608					~	14	0
4	HD 197481	BY*	20 45 09.5324974119	-31 20 27.237889841	10.05	8.627	9.078	6.593	M1VeBa1	1153	0
5	HD 197481b	Pl?	20 45 09.5324974119	-31 20 27.237889841					~	106	0
6	HD 197481c	Pl?	20 45 09.5324974119	-31 20 27.237889841					~	50	0

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