Constraining the reflective properties of WASP-178 b using CHEOPS photometry
Journal article, 2024

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.

planets and satellites: atmospheres

planets and satellites: gaseous planets

techniques: photometric

planets and satellites: individual: wasp-178 b

planets and satellites: detection

Author

I. Pagano

Istituto nazionale di astrofisica (INAF)

Gaetano Scandariato

Istituto nazionale di astrofisica (INAF)

V. Singh

Istituto nazionale di astrofisica (INAF)

M. Lendl

University of Geneva

D. Queloz

University of Cambridge

Swiss Federal Institute of Technology in Zürich (ETH)

A.E. Simon

University of Bern

S. G. Sousa

University of Porto

A. Brandeker

Stockholm University

A. Collier Cameron

University of St Andrews

S. Sulis

Laboratoire d'Astrophysique de Marseille

V. Van Grootel

University of Liège

T.G. Wilson

University of St Andrews

Y. Alibert

University of Bern

R. Alonso

Instituto de Astrofísica de Canarias

University of La Laguna

G. Anglada

Institute of Space Studies of Catalonia (IEEC)

Institute of Space Sciences (ICE) - CSIC

T. Bárczy

Admatis

D. Barrado Navascues

European Space Astronomy Centre (ESAC)

S.C.C. Barros

University of Porto

W. Baumjohann

Institut fur Weltraumforschung

M. Beck

University of Geneva

T. Beck

University of Bern

W. Benz

University of Bern

N. Billot

University of Geneva

X. Bonfils

Institut de Planétologie et d’Astrophysique de Grenoble (IPAG)

L. Borsato

Istituto nazionale di astrofisica (INAF)

C. Broeg

University of Bern

G. Bruno

Istituto nazionale di astrofisica (INAF)

L. Carone

Institut fur Weltraumforschung

S. Charnoz

Institut de Physique du Globe de Paris

C. Corral Van Damme

European Space Research and Technology Centre (ESA ESTEC)

Szilard Csizmadia

German Aerospace Center (DLR)

P. E. Cubillos

Istituto nazionale di astrofisica (INAF)

Institut fur Weltraumforschung

M. B. Davies

Lund University

M. Deleuil

Laboratoire d'Astrophysique de Marseille

A. Deline

University of Geneva

L. Delrez

University of Liège

O. Demangeon

University of Porto

B.O. Demory

University of Bern

D. Ehrenreich

University of Geneva

Anders Erikson

German Aerospace Center (DLR)

A. Fortier

University of Bern

L. Fossati

Institut fur Weltraumforschung

Malcolm Fridlund

Leiden University

Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics

D. Gandolfi

University of Turin

Michaël Gillon

University of Liège

M. Gudel

University of Vienna

Maximilian N. Günther

European Space Research and Technology Centre (ESA ESTEC)

Ch. Helling

Institut fur Weltraumforschung

Technische Universität Graz

S. Hoyer

Laboratoire d'Astrophysique de Marseille

K. Isaak

European Space Research and Technology Centre (ESA ESTEC)

L. L. Kiss

Hungarian Academy of Sciences

Eötvös Loránd University (ELTE)

E. Kopp

German Aerospace Center (DLR)

K. W.F. Lam

German Aerospace Center (DLR)

J. Laskar

Paris Observatory

A. L. des Etangs

Institut d 'Astrophysique de Paris

D. Magrin

Istituto nazionale di astrofisica (INAF)

P. Maxted

Keele University

C. Mordasini

University of Bern

M. Munari

Istituto nazionale di astrofisica (INAF)

Valerio Nascimbeni

Istituto nazionale di astrofisica (INAF)

G. Olofsson

Stockholm University

R. Ottensamer

University of Vienna

Enric Palle

University of La Laguna

Instituto de Astrofísica de Canarias

G. Peter

German Aerospace Center (DLR)

Giampaolo P. Piotto

Istituto nazionale di astrofisica (INAF)

University of Padua

D. Pollacco

The University of Warwick

R. Ragazzoni

Istituto nazionale di astrofisica (INAF)

University of Padua

N. Rando

European Space Research and Technology Centre (ESA ESTEC)

H. Rauer

Technische Universität Berlin

German Aerospace Center (DLR)

Freie Universität Berlin

C. Reimers

University of Vienna

I. Ribas

Institute of Space Sciences (ICE) - CSIC

Institute of Space Studies of Catalonia (IEEC)

M. Rieder

University of Bern

N. C. Santos

University of Porto

D. Segransan

University of Geneva

A. M.S. Smith

German Aerospace Center (DLR)

M. Stalport

University of Liège

Manfred B. Steller

Institut fur Weltraumforschung

G.M. Szabó

Eötvös Loránd University (ELTE)

Nicolas Thomas

University of Bern

S. Udry

University of Geneva

J. Venturini

University of Geneva

N. A. Walton

University of Cambridge

Astronomy and Astrophysics

0004-6361 (ISSN) 1432-0746 (eISSN)

Vol. 682 A102

Exoplanet diversity with satellite studies

Swedish National Space Board (174/18), 2019-02-04 -- 2023-08-01.

Subject Categories

Astronomy, Astrophysics and Cosmology

DOI

10.1051/0004-6361/202346705

More information

Latest update

3/5/2024 1