J/A+A/674/A43 TOI-5678 b 48-day transiting Neptune (Ulmer-Moll+, 2023)
TOI-5678 b: a 48-day transiting Neptune-mass planet characterized with
CHEOPS and HARPS,
Ulmer-Moll S., Osborn H.P., Tuson A., Egger J.A., Lendl M., Maxted P.,
Bekkelien A., Simon A.E., Olofsson G., Adibekyan V., Alibert Y.,
Bonfanti A., Bouchy F., Brandeker A., Fridlund M., Gandolfi D.,
Mordasini C., Persson C.M., Salmon S., Serrano L.M., Sousa S.G.,
Wilson T.G., Rieder M., Hasiba J., Asquier J., Sicilia D., Walter I.,
Alonso R., Anglada G., Barrado y Navascues D., Barros S.C.C.,
Baumjohann W., Beck M., Beck T., Benz W., Billot N., Bonfils X.,
Borsato L., Broeg C., Barczy T., Cabrera J., Charnoz S., Cointepas M.,
Collier Cameron A., Csizmadia Sz., Cubillos P.E., Davies M.B., Deleuil M.,
Deline A., Delrez L., Demangeon O.D.S., Demory B.-O., Dumusque X.,
Ehrenreich D., Eisner N.L., Erikson A., Fortier A., Fossati L., Gillon M.,
Grieves N., Guedel M., Hagelberg J., Helled R., Hoyer S., Isaak K.G.,
Kiss L.L., Laskar J., Lecavelier des Etangs A., Lovis C., Magrin D.,
Nascimbeni V., Otegi J., Ottensammer R., Pagano I., Palle E., Peter G.,
Piotto G., Pollacco D., Psaridi A., Queloz D., Ragazzoni R., Rando N.,
Rauer H., Ribas I., Santos N.C., Scandariato G., Smith A.M.S., Steller M.,
Szabo G.M., Segransan D., Thomas N., Udry S., Van Grootel V., Venturini J.,
Walton N.A.
<Astron. Astrophys. 674, A43 (2023)>
=2023A&A...674A..43U 2023A&A...674A..43U (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Exoplanets ; Stars, dwarfs ;
Radial velocities ; Photometry ; Optical
Keywords: planets and satellites: detection -
planets and satellites: individual: TOI-5678 -
planets and satellites: gaseous planets - methods: data analysis
Abstract:
We report the discovery of a long-period transiting Neptune-mass
planet orbiting the G7-type star TOI-5678. Our spectroscopic analysis
shows that TOI-5678 is a star with a solar metallicity. The TESS light
curve of TOI-5678 presents two transit events separated by almost two
years. CHEOPS observed the target as part of its Guaranteed Time
Observation (GTO) program. After four non-detections corresponding to
possible periods, CHEOPS detected a transit event matching a unique
period alias. Follow-up radial velocity observations were carried out
with the ground-based high resolution spectrographs CORALIE and HARPS.
Joint modelling reveals that TOI-5678 hosts a 47.73 day period planet
and we measure an orbital eccentricity consistent with 0 at at
2σ. The planet has a mass of 20(±4) Mearth and a radius of
4.91(±0.08) Re. Using interior structure modeling, we find that
TOI-5678 b is composed of a low-mass core surrounded by a large H/He
layer.
Description:
Photometric measurements taken with the CHEOPS satellite.
Table includes the date of observation, the flux and its associated
error, and several parameters used for decorrelation. Radial velocity
measurements of TOI-5678 taken with the high-resolution spectrographs
CORALIE and HARPS. Table includes the date of observation, the radial
velocity and its associated error, the full width half maximum and its
error, the H-alpha index and its error, the spectrograph used to
measure the radial velocity, and the S-index with its error.
Objects:
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RA (2000) DE Designation(s)
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03 09 32.21 -34 11 53.1 TOI-5678 = TIC 209464063
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 153 232 CHEOPS light curve of TOI-5678
table2.dat 108 37 Radial velocities of TOI-5678
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 16 F16.8 d BJD Barycentric Julian date
18- 27 F10.8 --- Flux Normalized flux
29- 38 F10.8 --- e_Flux Normalized flux error
40- 45 A6 --- Inst Name of the instrument
47- 57 F11.8 --- bkcg Standardized background
59- 69 F11.8 --- sinra Sine of the roll angle
71- 81 F11.8 --- cosra Cosine of the roll angle
83- 93 F11.8 --- sin2ra Sine of 2*roll angle
95-105 F11.8 --- cos2ra Cosine of 2*roll angle
107-117 F11.8 --- sin3ra Sine of 3*roll angle
119-129 F11.8 --- cos3ra Cosine of 3*roll angle
131-141 F11.8 pix Xcen Standardized X centroid
143-153 F11.8 pix Ycen Standardized Y centroid
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 15 F15.7 d BJD Barycentric Julian date
17- 26 F10.7 km/s RV Radial velocity
28- 36 F9.7 km/s e_RV Radial velocity error
38- 49 F12.7 m/s FWHM Full width half maximum
51- 60 F10.7 m/s e_FWHM Full width half maximum error
62- 70 F9.7 --- Ha Hα index
72- 80 F9.7 --- e_Ha Hα index error
82- 88 A7 --- Inst Name of the instrument
90- 98 F9.7 --- SMW ? S index
100-108 F9.7 --- e_SMW ? S index error
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Acknowledgements:
Solene Ulmer-Moll, solene.ulmer-moll(at)unige.ch
(End) S. Ulmer-Moll [Geneva Obs., Switzerland], P. Vannier [CDS] 24-Apr-2023