J/A+A/675/A183 HD 190622 (TOI-1054) light and RV curves (Cabrera+, 2023)
The planetary system around HD 190622 (TOI-1054).
Measuring the gas content of low-mass planets orbiting F-stars.
Cabrera J., Gandolfi D., Serrano L.M., Csizmadia Sz., Egger J.A.,
Baumeister P., Krenn A., Benz W., Deline A., Floren H.-G.,
Collier Cameron A., Adibekyan V., Alibert Y., Bellomo S.E., Delrez L.,
Fossati L., Fortier A., Grziwa S., Hoyer S., Bonfanti A., Salmon S.,
Sousa S.G., Wilson T.G., Alarcon J., Alonso R., Anglada Escude G.,
Barczy T., Barragan O., Barrado D., Barros S.C.C., Baumjohann W., Beck M.,
Beck T., Bernabo L.M., Billot N., Bonfils X., Borsato L., Brandeker A.,
Broeg C., Carrion-Gonzalez O., Charnoz S., Ciardi D.R., Cochran W.D.,
Collins K.A., Collins K.I., Conti D.M., Davies M.B., Deeg H.J., Deleuil M.,
Demangeon O.D.S., Demory B.-O., Ehrenreich D., Erikson A., Esposito M.,
Fridlund M., Gillon M., Goffo E., Gudel M., Guenther E.W., Harre J.-V.,
Heng K., Hooton M.J., Isaak K.G., Jenkins J.M., Kiss L.L., Knudstrup E.,
Lam K.W.F., Laskat J., Lecavelier des Etangs A., Lendl M., Lovis C.,
Luque R., Magrin D., Maxted P.F.L., Muresan A., Nascimbeni V., Olofsson G.,
Osborn H.P., Osborne H.L.M., Ottensamer R., Pagano I., Palle E.,
Persson C.M., Peter G., Piotto G., Pollacco D., Queloz D., Ragazzoni R.,
Rando N., Rauer H., Redfield S., Ribas I., Ricker G.R., Rodler F.,
Santos N.C., Scandariato G., Seager S., Segransan D., Simon A.E.,
Smith A.M.S., Steller M., Szabo Gy.M., Thomas N., Tosi N., Twicken J.D.,
Udry S., Van Eylen V., Van Grootel V., Walton N.A., Winn J.N.
<Astron. Astrophys. 675, A183 (2023)>
=2023A&A...675A.183C 2023A&A...675A.183C (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Exoplanets ; Photometry ; Optical
Keywords: planetary systems - planets and satellites: detection
Abstract:
Giant planets are known to dominate the long-term stability of
planetary systems due to their prevailing gravitational interactions.
But they are also thought to play an important role in planet
formation. Observational constraints improve our understanding of
planetary formation processes like the delivery of volatile-rich
planetesimals from beyond the ice line into the inner planetary
system. Additional constraints may come from studies of the
atmosphere. But at the moment almost all studies of the atmosphere are
just detection of certain species, not quantitative measurements of
the abundances.
Accurate measurements of planetary bulk parameters - mass and
density - provide constraints on the inner structure and chemical
composition of transiting planets. These provide insight into
properties like the amount of volatiles, which in turn can be related
to formation and evolution processes.
The TESS mission reported a planetary candidate around HD 190622
(TOI-1054) which was subsequently validated and which deserved further
characterization with photometric and spectroscopic facilities. The
KESPRINT collaboration used HARPS data to independently confirm the
planetary candidate, securing its mass, and revealing the presence of
an outer giant planet in the system. The CHEOPS consortium invested
telescope time in the transiting target in order to reduce the
uncertainty of the radius, improving the characterization of the
planet.
We present the discovery and characterization of the planetary system
around HD 190622 (TOI-1054), a system hosting one transiting planet
which is smaller than Neptune (3.087+0.058-0.053REarth,
7.7±1.0MEarth) but has a similar bulk density (1.43±0.21g/cm3)
and an orbital period of 16 days; and a giant planet, not known to be
transiting, with a minimum mass of 227.0±6.7MEarth in an orbit
with a period of 315 days.
Our measurements constrain the structure and composition of the
transiting planet. HD 190622b has singular properties among the known
population of transiting planets that we discuss in detail. Among the
sub-Neptune-sized planets known today, this planet stands out because
of its large gas content.
Description:
HD 190622 (TIC 366989877) was observed by TESS in Sectors
13 (June 2019) and 27 (July 2020) with a two-minute cadence.
We observed TOI-1054b with the Guaranteed Time Observing
Program number 24 Gas content of low-mass planets in order to
precisely characterize the radius of the planet. We acquired three
transit observations with CHEOPS (2021-06-12, 2021-06-28 and
2021-07-29)
We acquired 117 useful high-resolution (R∼115000) spectra
of HD 190622 using the High Accuracy Radial Velocity Planet Searcher
(HARPS) spectrograph mounted at the ESO-3.6m telescope at La Silla
Observatory. The observations span more than 3 years between 18
September 2019 and 24 November 2022.
Objects:
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RA (2000) DE Designation(s)
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20 08 27.39 -54 19 02.7 HD 190622 = HIP 99212
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
photom.dat 70 5719 TOI 1054 TESS and CHEOPS photometry
rv.dat 59 118 TOI 1054 HARPS radial velocities
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Byte-by-byte Description of file: photom.dat
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Bytes Format Units Label Explanations
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1- 20 F20.12 d BJD Barycentric Julian date
22- 45 E24.18 --- Flux Normalised detrended flux
47- 70 E24.18 --- e_Flux Normalised flux error
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Byte-by-byte Description of file: rv.dat
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Bytes Format Units Label Explanations
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1- 16 F16.8 d BJD Barycentric Julian date (TDB)
18- 38 F21.18 km/s RV Radial velocity
40- 59 F20.18 km/s e_RV Radial velocity error
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Acknowledgements:
Juan Cabrera, juan.cabrera(at)dlr.de
(End) Patricia Vannier [CDS] 22-Jun-2023