J/MNRAS/511/4551 TOI-561 CHEOPS light curves (Lacedelli+, 2022)
Investigating the architecture and internal structure of the TOI-561 system
planets with CHEOPS, HARPS-N, and TESS.
Lacedelli G., Wilson T.G., Malavolta L., Hooton M.J., Collier Cameron A.,
Alibert Y., Mortier A., Bonfanti A., Haywood R.D., Hoyer S., Piotto G.,
Bekkelien A., Vanderburg A.M., Benz W., Dumusque X., Deline A.,
Lopez-Morales M., Borsato L., Rice K., Fossati L., Latham D. W.,
Brandeker A., Poretti E., Sousa S. G., Sozzetti A., Salmon S., Burke C.J.,
Van Grootel V., Fausnaugh M.M., Adibekyan V., Huang C.X., Osborn H.P.,
Mustill A. J., Palle E., Bourrier V., Nascimbeni V., Alonso R., Anglada G.,
Barczy T., Barrado y Navascues D., Barros S.C.C., Baumjohann W., Beck M.,
Beck T., Billot N., Bonfils X., Broeg C., Buchhave L.A., Cabrera J.,
Charnoz S., Cosentino R., Csizmadia Sz., Davies M. B., Deleuil M.,
Delrez L., Demangeon O., Demory B-O., Ehrenreich D., Erikson A.,
Esparza-Borges E., Floren H.G., Fortier A., Fridlund M., Futyan D.,
Gandolfi D., Ghedina A., Gillon M., Guedel M., Guterman P., Harutyunyan A.,
Heng K., Isaak K.G., Jenkins J.M., Kiss L., Laskar J.,
Lecavelier des Etangs A., Lendl M., Lovis C., Magrin D., Marafatto L.,
Martinez Fiorenzano A.F., Maxted P.F.L., Mayor M., Micela G., Molinari E.,
Murgas F., Narita N., Olofsson G., Ottensamer R., Pagano I., Pasetti A.,
Pedani M., Pepe F.A., Peter G., Phillips D.F., Pollacco D., Queloz D.,
Ragazzoni R., Rando N., Ratti F., Rauer H., Ribas I., Santos N.C.,
Sasselov D., Scandariato G., Seager S., Segransan D., Serrano L.M.,
Simon A.E., Smith A.M.S., Steinberger M., Steller M., Szabo Gy.,
Thomas N., Twicken J.D., Udry S., Walton N., Winn J.N.
<Mon. Not. R. Astron. Soc. 511, 4551-4571 (2022)>
=2022MNRAS.511.4551L 2022MNRAS.511.4551L (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Exoplanets ; Photometry, optical
Keywords: techniques: photometric - techniques: radial velocities -
planets and satellites: fundamental parameters -
planets and satellites: interiors - stars: individual: TOI-561
(TIC 377064495, Gaia EDR3 3850421005290172416)
Abstract:
We present a precise characterization of the TOI-561 planetary system
obtained by combining previously published data with TESS and CHEOPS
photometry, and a new set of 62 HARPS-N radial velocities (RVs). Our
joint analysis confirms the presence of four transiting planets,
namely TOI-561 b (P=0.45d, R=1.42R⊕, M=2.0M⊕),
TOI-561 c (P=10.78d, R=2.91R⊕, M=5.4M⊕),
TOI-561 d (P=25.7d, R=2.82R⊕, M=13.2M⊕), and
TOI-561 e (P=77d, R=2.55R⊕, M=12.6R⊕). Moreover, we
identify an additional, long-period signal (>450d) in the RVs, which
could be due to either an external planetary companion or to stellar
magnetic activity. The precise masses and radii obtained for the four
planets allowed us to conduct interior structure and atmospheric
escape modelling. TOI-561 b is confirmed to be the lowest density
(ρb=3.8±0.5g/cm3) ultra-short period (USP) planet known to
date, and the low metallicity of the host star makes it consistent
with the general bulk density-stellar metallicity trend. According to
our interior structure modelling, planet b has basically no gas
envelope, and it could host a certain amount of water. In contrast,
TOI-561 c, d, and e likely retained an H/He envelope, in addition to a
possibly large water layer. The inferred planetary compositions
suggest different atmospheric evolutionary paths, with planets b and c
having experienced significant gas loss, and planets d and e showing
an atmospheric content consistent with the original one. The
uniqueness of the USP planet, the presence of the long-period planet
TOI-561 e, and the complex architecture make this system an appealing
target for follow-up studies.
Description:
Raw and detrended light curves of three CHEOPS visits of TOI-561,
targeting planets b (all visits), c (visit 1 and 2), d (visit 3)
Objects:
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RA (2000) DE Designation(s)
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09 52 44.55 +06 12 58.9 TOI-561 = TIC 377064495
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File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
v1-det.dat 55 597 CHEOPS visit 1 detrended fluxes
v1-raw.dat 213 604 CHEOPS visit 1 raw data
v2-det.dat 60 195 CHEOPS visit 2 detrended fluxes
v2-raw.dat 213 207 CHEOPS visit 2 raw data
v3-det.dat 60 1929 CHEOPS visit 3 detrended fluxes
v3-raw.dat 213 1978 CHEOPS visit 3 raw data
table5.dat 94 144 HARPS-N RV and activity indices measurements
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Byte-by-byte Description of file: v1-det.dat v2-det.dat v3-det.dat
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Bytes Format Units Label Explanations
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1- 18 F18.10 d BJD Barycentric Julian Date (TDB)
20- 37 F18.16 --- Flux Detrended normalised flux
39- 60 E22.17 --- e_Flux Error on the detrended normalised flux
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Byte-by-byte Description of file: v1-raw.dat v2-raw.dat v3-raw.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
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1- 18 F18.10 d BJD Barycentric Julian Date (TDB)
20- 37 F18.16 --- Flux Raw normalised flux
39- 60 E22.16 --- e_Flux Error on the raw normalised flux
62- 80 E19.15 pix Xshift Target position offset in x-direction
82- 98 F17.14 pix Yshift Target position offset in y-direction
100-122 F23.19 deg RollAngle Roll angle
124-146 E23.16 --- Cont Flux contaminants/Flux target
148-171 E24.17 --- Bckg Background in the aperture
173-194 E22.16 --- Smearing Smearing in the aperture
196-213 F18.15 deg deltaT Offset of the telescope temperature
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 13 F13.5 d BJD Barycentric Julian Date (TDB)
15- 22 F8.2 m/s RV Radial velocity
24- 27 F4.2 m/s e_RV Radial velocity error
29- 34 F6.4 km/s FWHM FWHM
36- 41 F6.4 km/s e_FWHM FWHM error
43- 48 F6.2 m/s Span Bissector span velocity of the
cross-correlation function (CCF)
50- 53 F4.2 m/s e_Span Bissector span error
55- 60 F6.3 --- Contrast Contrast span of the CCF
62- 66 F5.3 --- e_Contrast Contrast error
68- 73 F6.4 --- Sindex S index
75- 80 F6.4 --- e_Sindex S index error
82- 87 F6.4 --- Ha Hα index
89- 94 F6.4 --- e_Ha Hα index error
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Acknowledgements:
Gaia Lacedelli, gaia.lacedelli(at)phd.unipd.it
(End) Patricia Vannier [CDS] 31-Mar-2022