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Transit timing variations of AU Microscopii b and c

Szabó, G.M. ; Davies, M.B. LU and Wolter, D. (2022) In Astronomy and Astrophysics 659.
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 2020a 2021 measurements together, we find that a prominent TTV emerges with a full span of a ¥23 min... (More)
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 2020a 2021 measurements together, we find that a prominent TTV emerges with a full span of a ¥23 min between the two TTV extrema. Assuming that the period change results from a periodic process a such as mutual perturbationsa we demonstrate that the times of transits in the summer of 2022 are expected to be 30a 85 min later than predicted by the available linear ephemeris. © 2022 ESO. (Less)
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keywords
Planets and satellites: fundamental parameters, Planets and satellites: individual: AU Mic b and c, Microwave integrated circuits, Satellites, Timing circuits, Debris disk, Follow up, Large amplitude, Neptune, Planet and satellite: individual: AU mic b and c, Planetary system, Planets and satellites: individual, Timing variations, Transit timing, Planets
in
Astronomy and Astrophysics
volume
659
article number
L7
publisher
EDP Sciences
external identifiers
  • scopus:85127067590
ISSN
0004-6361
DOI
10.1051/0004-6361/202243076
language
English
LU publication?
yes
additional info
Number of authors = 79 EID = 85127067590 Article no = L7 Affiliation = Szabó, G.M., ELTE Eötvös Loránd University, Gothard Astrophysical Observatory, Szent Imre h. u. 112, Szombathely, 9700, Hungary, MTA-ELTE Exoplanet Research Group, Szent Imre h. u. 112, Szombathely, 9700, Hungary Affiliation = Walton, N., Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge, CB3 0HA, United Kingdom Affiliation = Wolter, D., Institute of Planetary Research, German Aerospace Center (DLR), Rutherfordstrasse 2, Berlin, 12489, Germany
id
35a6370e-9bf7-4e62-b3e9-ad4680d326d9
date added to LUP
2022-09-05 13:52:22
date last changed
2022-09-05 13:55:16
@article{35a6370e-9bf7-4e62-b3e9-ad4680d326d9,
  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 2020a 2021 measurements together, we find that a prominent TTV emerges with a full span of a ¥23 min between the two TTV extrema. Assuming that the period change results from a periodic process a such as mutual perturbationsa we demonstrate that the times of transits in the summer of 2022 are expected to be 30a 85 min later than predicted by the available linear ephemeris. © 2022 ESO.}},
  author       = {{Szabó, G.M. and Davies, M.B. and Wolter, D.}},
  issn         = {{0004-6361}},
  keywords     = {{Planets and satellites: fundamental parameters; Planets and satellites: individual: AU Mic b and c; Microwave integrated circuits; Satellites; Timing circuits; Debris disk; Follow up; Large amplitude; Neptune; Planet and satellite: individual: AU mic b and c; Planetary system; Planets and satellites: individual; Timing variations; Transit timing; Planets}},
  language     = {{eng}},
  publisher    = {{EDP Sciences}},
  series       = {{Astronomy and Astrophysics}},
  title        = {{Transit timing variations of AU Microscopii b and c}},
  url          = {{http://dx.doi.org/10.1051/0004-6361/202243076}},
  doi          = {{10.1051/0004-6361/202243076}},
  volume       = {{659}},
  year         = {{2022}},
}