J/A+A/659/L7 AU Mic b and c transits with CHEOPS (Szabo+, 2022)
Transit timing variations of AU Microscopii b and c.
Szabo 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.
<Astron. Astrophys. 659, L7 (2022)>
=2022A&A...659L...7S 2022A&A...659L...7S (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Exoplanets ; Photometry ; Optical
Keywords: planets and satellites: fundamental parameters -
planets and satellites: individual: AU Mic
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.
Description:
Processed CHEOPS PIPE photometry of the transits in the form as it is
shown in Fig. A.1. of the paper. The processing consisted of trend
filtering and normalisation for out-of-transit flux.
Objects:
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RA (2000) DE Designation(s)
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20 45 09.53 -31 20 27.2 Au Mic = HD 197481
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
aumic_b.dat 23 6451 CHEOPS photometry of Au Mic b transits in 2021
aumic_c.dat 23 4266 CHEOPS photometry of Au Mic c transits in 2021
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See also:
J/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)
Byte-by-byte Description of file: aumic_b.dat aumic_c.dat
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Bytes Format Units Label Explanations
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1- 14 F14.6 d BJD CHEOPS barycentric Julian date
16- 23 F8.6 --- Flux Relative flux
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Acknowledgements:
Gyula M. Szabo, szabomgyula(at)gmail.com
(End) Gyula M. Szabo [ELTE GAO, Hungary], Patricia Vannier [CDS] 01-Mar-2022