J/A+A/682/A102 WASP-178b CHEOPS light curves (Pagano+, 2024)
Constraining the reflective properties of WASP-178b using CHEOPS photometry.
Pagano I., Scandariato G., Singh V., Lendl M., Queloz D., Simon A.E.,
Sousa S.G., Brandeker A., Collier Cameron A., Sulis S., Van Grootel V.,
Wilson T.G., Alibert Y., Alonso R., Anglada G., Barczy T.,
Barrado Navascues D., Barros S.C.C., Baumjohann W., Beck M., Beck T.,
Benz W., Billot N., Bonfils X., Borsato L., Broeg C., Bruno G., Carone L.,
Charnoz S., Corral van Damme C., Csizmadia Sz., Cubillos P.E., Davies M.B.,
Deleuil M., Deline A., Delrez L., Demangeon O.D.S., Demory B.-O.,
Ehrenreich D., Erikson A., Fortier A., Fossati L., Fridlund M., Gandolfi D.,
Gillon M., Guedel M., Guenther M.N., Helling C., Hoyer S., Isaak K.G.,
Kiss L.L., Kopp E., Lam K.W.F., Laskar J., Lecavelier des Etangs A.,
Magrin D., Maxted P.F.L., Mordasini C., Munari M., Nascimbeni V.,
Olofsson G., Ottensamer R., Palle E., Peter G., Piotto G., Pollacco D.,
Ragazzoni R., Rando N., Rauer H., Reimers C., Ribas I., Rieder M.,
Santos N.C., Segransan D., Smith A.M.S., Stalport M., Steller M.,
Szabo Gy.M., Thomas N., Udry S., Venturini J., Walton N.A.
<Astron. Astrophys. 682, A102 (2024)>
=2024A&A...682A.102P 2024A&A...682A.102P (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Exoplanets ; Photometry ; Optical
Keywords: planets and satellites: individual: WASP-178b -
techniques: photometric - planets and satellites: detection -
planets and satellites: gaseous planets
planets and satellites: atmospheres -
Abstract:
Multiwavelength photometry of the secondary eclipses of extrasolar
planets is able to disentangle the reflected and thermally emitted
light radiated from the planetary dayside. This leads to the
measurement of the planetary geometric albedo Ag, which is an
indicator of the presence of clouds in the atmosphere, and the
recirculation efficiency ε, which quantifies the energy
transport within the atmosphere. In this work we aim to measure A_g
and ε for the planet WASP-178b, a highly irradiated giant
planet with an estimated equilibrium temperature of 2450K. We analyzed
archival spectra and the light curves collected by CHEOPS and TESS to
characterize the host WASP-178, refine the ephemeris of the system and
measure the eclipse depth in the passbands of the two respective
telescopes. We measured a marginally significant eclipse depth of
70±40ppm in the TESS passband and statistically significant depth of
70±20ppm in the CHEOPS passband. Combining the eclipse depth
measurement in the CHEOPS (lambdaeff=6300Å) and TESS
(lambdaeff=8000Å) passbands we constrained the dayside brightness
temperature of WASP-178b in the 2250-2800K interval. The geometric
albedo 0.1<Ag<0.35 is in general agreement with the picture of
poorly reflective giant planets, while the recirculation efficiency
ε>0.7 makes WASP-178b an interesting laboratory to test the
current heat recirculation models.
Description:
CHEOPS photometry of WASP-178 reduced with PIPE and detrended as
described in the paper.
Objects:
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RA (2000) DE Designation(s)
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15 09 04.89 -42 42 17.7 WASP-178 = HD 134004
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
lc.dat 112 2656 CHEOPS photometric data
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Byte-by-byte Description of file: lc.dat
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Bytes Format Units Label Explanations
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1 I1 --- Visit [1/6] Running ID for the CHEOPS visits
listed in Table 2 of the paper
3- 25 F23.15 d BJD Timestamps of the light curve (TDB)
27- 50 F24.15 --- Flux Flux extracted by PIPE
52- 71 F20.15 --- e_Flux Error on Flux
73- 74 I2 --- Flag [0/25] Flag assigned by PIPE
76- 93 F18.15 --- FluxDet ?=-9.99999 Normalized secondary eclipse light
curves after additional data clipping,
normalization and red noise correction
(see paper)
95-112 F18.15 --- e_FluxDet ?=-9.99999 Error on FluxDet
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Acknowledgements:
Gaetano Scandariato, gaetano.scandariato(at)inaf.it
(End) Patricia Vannier [CDS] 04-Sep-2023