Constraining the reflective properties of WASP-178 b using CHEOPS photometry

I. Pagano; G. Scandariato; V. Singh; M. Lendl; D. Queloz; A. E. Simon; S. G. Sousa; A. Brandeker; A. Collier Cameron; S. Sulis; V. Van Grootel; T. G. Wilson; Y. Alibert; R. Alonso; G. Anglada; T. Bárczy; D. Barrado Navascues; S. C.C. Barros; W. Baumjohann; M. Beck; T. Beck; W. Benz; N. Billot; X. Bonfils; L. Borsato; C. Broeg; G. Bruno; L. Carone; S. Charnoz; C. Corral Van Damme; Sz Csizmadia; P. E. Cubillos; M. B. Davies; M. Deleuil; A. Deline; L. Delrez; O. D.S. Demangeon; B. O. Demory; D. Ehrenreich; A. Erikson; A. Fortier; L. Fossati; M. Fridlund; D. Gandolfi; M. Gillon; M. Güdel; M. N. Günther; Ch Helling; R. Ottensamer; M. Rieder

doi:10.1051/0004-6361/202346705

Constraining the reflective properties of WASP-178 b using CHEOPS photometry

I. Pagano, G. Scandariato, V. Singh, M. Lendl, D. Queloz, A. E. Simon, S. G. Sousa, A. Brandeker, A. Collier Cameron, S. Sulis, V. Van Grootel, T. G. Wilson, Y. Alibert, R. Alonso, G. Anglada, T. Bárczy, D. Barrado Navascues, S. C.C. Barros, W. Baumjohann, M. BeckT. Beck, W. Benz, N. Billot, X. Bonfils, L. Borsato, C. Broeg, G. Bruno, L. Carone, S. Charnoz, C. Corral Van Damme, Sz Csizmadia, P. E. Cubillos, M. B. Davies, M. Deleuil, A. Deline, L. Delrez, O. D.S. Demangeon, B. O. Demory, D. Ehrenreich, A. Erikson, A. Fortier, L. Fossati, M. Fridlund, D. Gandolfi, M. Gillon, M. Güdel, M. N. Günther, Ch Helling, R. Ottensamer, M. Rieder

Institute of Theoretical and Computational Physics (5150)

Research output: Contribution to journal › Article › peer-review

Abstract

Context. Multiwavelength photometry of the secondary eclipses of extrasolar planets is able to disentangle the reflected and thermally emitted light radiated from the planetary dayside. Based on this, we can measure 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. Aims. We measure Ag and ϵ for the planet WASP-178 b, a highly irradiated giant planet with an estimated equilibrium temperature of 2450 K. Methods. 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 telescopes. Results. We measured a marginally significant eclipse depth of 70 ± 40 ppm in the TESS passband, and a statistically significant depth of 70 ± 20 ppm in the CHEOPS passband. Conclusions. Combining the eclipse-depth measurement in the CHEOPS (λeff = 6300 Å) and TESS (λeff = 8000 Å) passbands, we constrained the dayside brightness temperature of WASP-178 b in the 2250-2800 K interval. The geometric albedo 0.1< Ag<0.35 generally supports the picture that giant planets are poorly reflective, while the recirculation efficiency ϵ >0.7 makes WASP-178 b an interesting laboratory for testing the current heat-recirculation models.

Original language	English
Article number	A102
Journal	Astronomy and Astrophysics
Volume	682
DOIs	https://doi.org/10.1051/0004-6361/202346705
Publication status	Published - 1 Feb 2024

Keywords

planets and satellites: atmospheres
planets and satellites: detection
planets and satellites: gaseous planets
planets and satellites: individual: wasp-178 b
techniques: photometric

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1051/0004-6361/202346705Licence: CC BY 4.0

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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., Bárczy, T., Barrado Navascues, D., Barros, S. C. C., Baumjohann, W., ... Rieder, M. (2024). Constraining the reflective properties of WASP-178 b using CHEOPS photometry. Astronomy and Astrophysics, 682, Article A102. https://doi.org/10.1051/0004-6361/202346705

Pagano, I, Scandariato, G, Singh, V, Lendl, M, Queloz, D, Simon, AE, Sousa, SG, Brandeker, A, Collier Cameron, A, Sulis, S, Van Grootel, V, Wilson, TG, Alibert, Y, Alonso, R, Anglada, G, Bárczy, T, Barrado Navascues, D, Barros, SCC, 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, S, Cubillos, PE, Davies, MB, Deleuil, M, Deline, A, Delrez, L, Demangeon, ODS, Demory, BO, Ehrenreich, D, Erikson, A, Fortier, A, Fossati, L, Fridlund, M, Gandolfi, D, Gillon, M, Güdel, M, Günther, MN, Helling, C, Ottensamer, R & Rieder, M 2024, 'Constraining the reflective properties of WASP-178 b using CHEOPS photometry', Astronomy and Astrophysics, vol. 682, A102. https://doi.org/10.1051/0004-6361/202346705

@article{c60e9e5a6f464ed1b0df4510af8787cd,

title = "Constraining the reflective properties of WASP-178 b using CHEOPS photometry",

abstract = "Context. Multiwavelength photometry of the secondary eclipses of extrasolar planets is able to disentangle the reflected and thermally emitted light radiated from the planetary dayside. Based on this, we can measure 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. Aims. We measure Ag and ϵ for the planet WASP-178 b, a highly irradiated giant planet with an estimated equilibrium temperature of 2450 K. Methods. 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 telescopes. Results. We measured a marginally significant eclipse depth of 70 ± 40 ppm in the TESS passband, and a statistically significant depth of 70 ± 20 ppm in the CHEOPS passband. Conclusions. Combining the eclipse-depth measurement in the CHEOPS (λeff = 6300 {\AA}) and TESS (λeff = 8000 {\AA}) passbands, we constrained the dayside brightness temperature of WASP-178 b in the 2250-2800 K interval. The geometric albedo 0.1< Ag<0.35 generally supports the picture that giant planets are poorly reflective, while the recirculation efficiency ϵ >0.7 makes WASP-178 b an interesting laboratory for testing the current heat-recirculation models.",

keywords = "planets and satellites: atmospheres, planets and satellites: detection, planets and satellites: gaseous planets, planets and satellites: individual: wasp-178 b, techniques: photometric",

author = "I. Pagano and G. Scandariato and V. Singh and M. Lendl and D. Queloz and Simon, {A. E.} and Sousa, {S. G.} and A. Brandeker and {Collier Cameron}, A. and S. Sulis and {Van Grootel}, V. and Wilson, {T. G.} and Y. Alibert and R. Alonso and G. Anglada and T. B{\'a}rczy and {Barrado Navascues}, D. and Barros, {S. C.C.} and W. Baumjohann and M. Beck and T. Beck and W. Benz and N. Billot and X. Bonfils and L. Borsato and C. Broeg and G. Bruno and L. Carone and S. Charnoz and {Corral Van Damme}, C. and Sz Csizmadia and Cubillos, {P. E.} and Davies, {M. B.} and M. Deleuil and A. Deline and L. Delrez and Demangeon, {O. D.S.} and Demory, {B. O.} and D. Ehrenreich and A. Erikson and A. Fortier and L. Fossati and M. Fridlund and D. Gandolfi and M. Gillon and M. G{\"u}del and G{\"u}nther, {M. N.} and Ch Helling and R. Ottensamer and M. Rieder",

note = "Publisher Copyright: {\textcopyright} The Authors 2024.",

year = "2024",

month = feb,

day = "1",

doi = "10.1051/0004-6361/202346705",

language = "English",

volume = "682",

journal = "Astronomy and Astrophysics",

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TY - JOUR

T1 - Constraining the reflective properties of WASP-178 b using CHEOPS photometry

AU - Pagano, I.

AU - Scandariato, G.

AU - Singh, V.

AU - Lendl, M.

AU - Queloz, D.

AU - Simon, A. E.

AU - Sousa, S. G.

AU - Brandeker, A.

AU - Collier Cameron, A.

AU - Sulis, S.

AU - Van Grootel, V.

AU - Wilson, T. G.

AU - Alibert, Y.

AU - Alonso, R.

AU - Anglada, G.

AU - Bárczy, T.

AU - Barrado Navascues, D.

AU - Barros, S. C.C.

AU - Baumjohann, W.

AU - Beck, M.

AU - Beck, T.

AU - Benz, W.

AU - Billot, N.

AU - Bonfils, X.

AU - Borsato, L.

AU - Broeg, C.

AU - Bruno, G.

AU - Carone, L.

AU - Charnoz, S.

AU - Corral Van Damme, C.

AU - Csizmadia, Sz

AU - Cubillos, P. E.

AU - Davies, M. B.

AU - Deleuil, M.

AU - Deline, A.

AU - Delrez, L.

AU - Demangeon, O. D.S.

AU - Demory, B. O.

AU - Ehrenreich, D.

AU - Erikson, A.

AU - Fortier, A.

AU - Fossati, L.

AU - Fridlund, M.

AU - Gandolfi, D.

AU - Gillon, M.

AU - Güdel, M.

AU - Günther, M. N.

AU - Helling, Ch

AU - Ottensamer, R.

AU - Rieder, M.

PY - 2024/2/1

Y1 - 2024/2/1

N2 - Context. Multiwavelength photometry of the secondary eclipses of extrasolar planets is able to disentangle the reflected and thermally emitted light radiated from the planetary dayside. Based on this, we can measure 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. Aims. We measure Ag and ϵ for the planet WASP-178 b, a highly irradiated giant planet with an estimated equilibrium temperature of 2450 K. Methods. 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 telescopes. Results. We measured a marginally significant eclipse depth of 70 ± 40 ppm in the TESS passband, and a statistically significant depth of 70 ± 20 ppm in the CHEOPS passband. Conclusions. Combining the eclipse-depth measurement in the CHEOPS (λeff = 6300 Å) and TESS (λeff = 8000 Å) passbands, we constrained the dayside brightness temperature of WASP-178 b in the 2250-2800 K interval. The geometric albedo 0.1< Ag<0.35 generally supports the picture that giant planets are poorly reflective, while the recirculation efficiency ϵ >0.7 makes WASP-178 b an interesting laboratory for testing the current heat-recirculation models.

AB - Context. Multiwavelength photometry of the secondary eclipses of extrasolar planets is able to disentangle the reflected and thermally emitted light radiated from the planetary dayside. Based on this, we can measure 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. Aims. We measure Ag and ϵ for the planet WASP-178 b, a highly irradiated giant planet with an estimated equilibrium temperature of 2450 K. Methods. 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 telescopes. Results. We measured a marginally significant eclipse depth of 70 ± 40 ppm in the TESS passband, and a statistically significant depth of 70 ± 20 ppm in the CHEOPS passband. Conclusions. Combining the eclipse-depth measurement in the CHEOPS (λeff = 6300 Å) and TESS (λeff = 8000 Å) passbands, we constrained the dayside brightness temperature of WASP-178 b in the 2250-2800 K interval. The geometric albedo 0.1< Ag<0.35 generally supports the picture that giant planets are poorly reflective, while the recirculation efficiency ϵ >0.7 makes WASP-178 b an interesting laboratory for testing the current heat-recirculation models.

KW - planets and satellites: atmospheres

KW - planets and satellites: detection

KW - planets and satellites: gaseous planets

KW - planets and satellites: individual: wasp-178 b

KW - techniques: photometric

UR - http://www.scopus.com/inward/record.url?scp=85185216038&partnerID=8YFLogxK

U2 - 10.1051/0004-6361/202346705

DO - 10.1051/0004-6361/202346705

M3 - Article

AN - SCOPUS:85185216038

SN - 0004-6361

VL - 682

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

M1 - A102

ER -

Constraining the reflective properties of WASP-178 b using CHEOPS photometry

Abstract

Keywords

ASJC Scopus subject areas

UN SDGs

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