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Constraining the reflective properties of WASP-178 b using CHEOPS photometry
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för astronomi.ORCID-id: 0000-0002-7201-7536
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för astronomi.ORCID-id: 0000-0003-3747-7120
Rekke forfattare: 822024 (engelsk)Inngår i: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 682, artikkel-id A102Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

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.

sted, utgiver, år, opplag, sider
2024. Vol. 682, artikkel-id A102
Emneord [en]
planets and satellites: individual: wasp-178 b, techniques: photometric, planets and satellites: detection, planets and satellites: gaseous planets, planets and satellites: atmospheres
HSV kategori
Identifikatorer
URN: urn:nbn:se:su:diva-228318DOI: 10.1051/0004-6361/202346705ISI: 001188262400001Scopus ID: 2-s2.0-85185216038OAI: oai:DiVA.org:su-228318DiVA, id: diva2:1851062
Tilgjengelig fra: 2024-04-12 Laget: 2024-04-12 Sist oppdatert: 2024-04-12bibliografisk kontrollert

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Brandeker, AlexisOlofsson, Göran

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