Transit timing variations of AU Microscopii b and c*
Journal article, 2022
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.
AU Mic b and c
planets and satellites: fundamental parameters
planets and satellites: individual
Author
Gy M. Szabo
Eötvös Loránd University (ELTE)
Z. Garai
Slovak Academy of Sciences
Eötvös Loránd University (ELTE)
A. Brandeker
Stockholm University
D. Gandolfi
University of Turin
T. G. Wilson
University of St Andrews
A. Deline
University of Geneva
G. Olofsson
Stockholm University
A. Fortier
University of Bern
D. Queloz
University of Geneva
University of Cambridge
L. Borsato
Istituto nazionale di astrofisica (INAF)
F. Kiefer
Sorbonne University
A. Lecavelier des Etangs
Sorbonne University
M. Lendl
University of Geneva
L. M. Serrano
University of Turin
S. Sulis
Aix Marseille University
S. Ulmer Moll
University of Geneva
V. Van Grootel
University of Liège
Y. Alibert
University of Bern
R. Alonso
Instituto de Astrofísica de Canarias
University of La Laguna
G. Anglada
Spanish National Research Council (CSIC)
Centre Tecnològic de Telecomunicacions de Catalunya (CTTC)
T. Barczy
Admatis
D. Barrado Y Navascues
Spanish National Research Council (CSIC)
S. C. C. Barros
University of Porto
W. Baumjohann
Austrian Academy of Sciences
M. Beck
University of Geneva
T. Beck
University of Bern
W. Benz
University of Bern
N. Billot
University of Geneva
A. Bonfanti
Austrian Academy of Sciences
X. Bonfils
Grenoble Alpes University
C. Broeg
University of Bern
J. Cabrera
German Aerospace Center (DLR)
S. Charnoz
Paris Descartes University
A. Collier Cameron
University of St Andrews
Sz Csizmadia
German Aerospace Center (DLR)
M. B. Davies
Lund University
M. Deleuil
Aix Marseille University
L. Delrez
University of Liège
O. Demangeon
University of Porto
B-O Demory
University of Bern
D. Ehrenreich
University of Geneva
A. Erikson
German Aerospace Center (DLR)
L. Fossati
Austrian Academy of Sciences
Malcolm Fridlund
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics
M. Gillon
University of Liège
M. Gudel
University of Vienna
K. Heng
The University of Warwick
University of Bern
S. Hoyer
Aix Marseille University
K. G. Isaak
European Space Research and Technology Centre (ESA ESTEC)
L. L. Kiss
Hungarian Academy of Sciences
Eötvös Loránd University (ELTE)
J. Laskar
Sorbonne University
C. Lovis
University of Geneva
D. Magrin
Istituto nazionale di astrofisica (INAF)
P. F. L. Maxted
Keele University
M. Mecina
University of Vienna
V Nascimbeni
Istituto nazionale di astrofisica (INAF)
R. Ottensamer
University of Vienna
I Pagano
Istituto nazionale di astrofisica (INAF)
E. Palle
Instituto de Astrofísica de Canarias
G. Peter
German Aerospace Center (DLR)
G. Piotto
Istituto nazionale di astrofisica (INAF)
University of Padua
D. Pollacco
The University of Warwick
R. Ragazzoni
University of Padua
Istituto nazionale di astrofisica (INAF)
N. Rando
European Space Agency (ESA)
H. Rauer
Technische Universität Berlin
German Aerospace Center (DLR)
Freie Universität Berlin
I Ribas
Spanish National Research Council (CSIC)
Centre Tecnològic de Telecomunicacions de Catalunya (CTTC)
N. C. Santos
University of Porto
M. Sarajlic
University of Bern
G. Scandariato
Istituto nazionale di astrofisica (INAF)
D. Segransan
University of Geneva
A. E. Simon
University of Bern
A. M. S. Smith
German Aerospace Center (DLR)
S. G. Sousa
University of Porto
M. Steller
Austrian Academy of Sciences
N. Thomas
University of Bern
S. Udry
University of Geneva
F. Verrecchia
Agenzia Spaziale Italiana
Osservatorio Astronomico di Roma
N. Walton
University of Cambridge
D. Wolter
German Aerospace Center (DLR)
Astronomy and Astrophysics
0004-6361 (ISSN) 1432-0746 (eISSN)
Vol. 659 L7Subject Categories (SSIF 2011)
Astronomy, Astrophysics and Cosmology
Atom and Molecular Physics and Optics
Other Physics Topics
DOI
10.1051/0004-6361/202243076