Transit timing variations of AU Microscopii b and c

Journal
Date Issued
2022
Author(s)
Gy. M. Szabó
•
Z. Garai
•
A. Brandeker
•
D. Gandolfi
•
T. G. Wilson
•
A. Deline
•
G. Olofsson
•
A. Fortier
•
D. Queloz
•
•
F. Kiefer
•
A. Lecavelier des Etangs
•
M. Lendl
•
L. M. Serrano
•
S. Sulis
•
S. Ulmer Moll
•
V. Van Grootel
•
Y. Alibert
•
R. Alonso
•
G. Anglada
•
T. Bárczy
•
D. Barrado y Navascues
•
S. C. C. Barros
•
W. Baumjohann
•
M. Beck
•
T. Beck
•
W. Benz
•
N. Billot
•
A. Bonfanti
•
X. Bonfils
•
C. Broeg
•
J. Cabrera
•
S. Charnoz
•
A. Collier Cameron
•
Sz. Csizmadia
•
M. B. Davies
•
M. Deleuil
•
L. Delrez
•
O. Demangeon
•
B. -O. Demory
•
D. Ehrenreich
•
A. Erikson
•
L. Fossati
•
M. Fridlund
•
M. Gillon
•
M. Güdel
•
K. Heng
•
S. Hoyer
•
K. G. Isaak
•
L. L. Kiss
•
J. Laskar
•
C. Lovis
•
•
P. F. L. Maxted
•
M. Mecina
•
•
R. Ottensamer
•
•
E. Pallé
•
G. Peter
•
G. Piotto
•
D. Pollacco
•
•
N. Rando
•
H. Rauer
•
I. Ribas
•
N. C. Santos
•
M. Sarajlic
•
•
D. Ségransan
•
A. E. Simon
•
A. M. S. Smith
•
S. Sousa
•
M. Steller
•
N. Thomas
•
S. Udry
•
F. Verrecchia
•
N. Walton
•
D. Wolter
DOI
Abstract
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 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.
Volume
659
Issue
L7
Start page
L7
Uri
Url
Issn Identifier
0004-6361
Rights
open.access
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