CHEOPS finds KELT-1b darker than expected in visible light. Discrepancy between the CHEOPS and TESS eclipse depths

Parviainen, H. and Wilson, T. G. and Lendl, M. and Kitzmann, D. and Palle, E. and Serrano, L. M. and Meier Valdes, E. and Benz, W. and Deline, A. and Ehrenreich, D. and Gutermann, P. and Heng, K. and Demangeon, O. D. S. and Bonfanti, A. and Salmon, S. and Singh, V. and Santos, N. C. and Sousa, S. G. and Alibert, Y. and Alonso, R. and Anglada Escudé, G. and Bàrczy, T. and Barrado y Navascués, D. and Barros, S. C. C. and Baumjohann, W. and Beck, M. and Beck, T. and Billot, N. and Bonfils, X. and Brandeker, A. and Broeg, C. and Cabrera, J. and Charnoz, S. and Collier Cameron, A. and Corral Van Damme, C. and Csizmadia, Sz. and Davies, M. B. and Deleuil, M. and Delrez, L. and Demory, B. -O. and Erikson, A. and Farinato, J. and Fortier, A. and Fossati, L. and Fridlund, M. and Gandolfi, D. and Gillon, M. and Güdel, M. and Hoyer, S. and Isaak, K. G. and Kiss, L. L. and Kopp, E. and Laskar, J. and Lecavelier des Etangs, A. and Lovis, C. and Magrin, D. and Maxted, P. F. L. and Mecina, M. and Nascimbeni, V. and Olofsson, G. and Ottensamer, R. and Pagano, I. and Peter, G. and Piazza, D. and Piotto, G. and Pollacco, D. and Queloz, D. and Ragazzoni, R. and Rando, N. and Rauer, H. and Ribas, I. and Scandariato, G. and Segransan, D. and Simon, A. E. and Smith, A. M. S. and Steller, M. and Szabo, Gy. M. and Thomas, N. and Udry, S. and Van Grootel, V. and Walton, N. A. (2022) CHEOPS finds KELT-1b darker than expected in visible light. Discrepancy between the CHEOPS and TESS eclipse depths. Astronomy & Astrophysics, 668, A93. EDP Sciences. doi: 10.1051/0004-6361/202244117. ISSN 0004-6361.

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Abstract

Recent studies based on photometry from the Transiting Exoplanet Survey Satellite (TESS) have suggested that the dayside of KELT-1b, a strongly irradiated brown dwarf, is significantly brighter in visible light than what would be expected based on Spitzer observations in the infrared. We observed eight eclipses of KELT-1b with CHaracterising ExOPlanet Satellite (CHEOPS) to measure its dayside brightness temperature in the bluest passband observed so far, and we jointly modelled the CHEOPS photometry with the existing optical and near-infrared photometry from TESS, LBT, CFHT, and Spitzer. Our modelling has led to a self-consistent dayside spectrum for KELT-1b covering the CHEOPS, TESS, H, Ks, and Spitzer IRAC 3.6 and 4.5 µm bands, where our TESS, H, Ks, and Spitzer band estimates largely agree with the previous studies. However, we discovered a strong discrepancy between the CHEOPS and TESS bands. The CHEOPS observations yield a higher photometric precision than the TESS observations, but they do not show a significant eclipse signal, while a deep eclipse is detected in the TESS band. The derived TESS geometric albedo of 0.36−0.13+0.12 is difficult to reconcile with a CHEOPS geometric albedo that is consistent with zero because the two passbands have considerable overlap. Variability in cloud cover caused by the transport of transient nightside clouds to the dayside could provide an explanation for reconciling the TESS and CHEOPS geometric albedos, but this hypothesis needs to be tested by future observations.

Item URL in elib:

https://elib.dlr.de/192627/

Document Type:

Article

Title:

CHEOPS finds KELT-1b darker than expected in visible light. Discrepancy between the CHEOPS and TESS eclipse depths

Authors:

Authors	Institution or Email of Authors	Author's ORCID iD	ORCID Put Code
Parviainen, H.	Instituto de Astrofisica de Canarias (IAC), 38205, La Laguna, Tenerife, Spain; Departamento de Astrofisica, Universidad de La Laguna, 38206, La Laguna, Tenerife, Spain	UNSPECIFIED	UNSPECIFIED
Wilson, T. G.	School of Physics and Astronomy, St. Andrews, UK	UNSPECIFIED	UNSPECIFIED
Lendl, M.	Geneva Observatory, University of Geneva, Chemin des Mailettes 51, 1290, Versoix, Switzerland	UNSPECIFIED	UNSPECIFIED
Kitzmann, D.	Center for Space and Habitability, University of Bern, Gesellschaftsstraße 6, 3012, Bern, Switzerland	UNSPECIFIED	UNSPECIFIED
Palle, E.	Instituto de Astrofísica de Canarias, 38205 La Laguna, Tenerife, Spain \| Departamento de Astrofisica, Universidad de La Laguna, 38206 La Laguna, Spain	UNSPECIFIED	UNSPECIFIED
Serrano, L. M.	Dipartimento di Fisica, Università degli Studi di Torino, via Pietro Giuria 1, I-10125, Torino, Italy	UNSPECIFIED	UNSPECIFIED
Meier Valdes, E.	Center for Space and Habitability, University of Bern, Gesellschaftsstrasse 6, 3012, Bern, Switzerland	UNSPECIFIED	UNSPECIFIED
Benz, W.	Physikalisches Institut, Universität Bern, CH	UNSPECIFIED	UNSPECIFIED
Deline, A.	Observatoire de Genève, University of Geneva, Switzerland	UNSPECIFIED	UNSPECIFIED
Ehrenreich, D.	Observatoire de Genève, University of Geneva, Switzerland	UNSPECIFIED	UNSPECIFIED
Gutermann, P.	Aix-Marseille Université, CNRS, CNES, Laboratoire d'Astrophysique de Marseille, 38 rue Frédéric Joliot-Curie, 13388, Marseille, France; Division Technique, Institut National des Sciences de l'Univers (INSU), CS 20330, 83507, La Seyne-sur-Mer, France	UNSPECIFIED	UNSPECIFIED
Heng, K.	Center for Space and Habitability, University of Bern, Gesellschaftsstrasse 6, 3012, Bern, Switzerland; Department of Physics, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, UK	UNSPECIFIED	UNSPECIFIED
Demangeon, O. D. S.	Instituto de Astrofísica e Ciências do Espaço, Universidade do Porto, CAUP, Rua das Estrelas, 4150-762, Porto, Portugal	UNSPECIFIED	UNSPECIFIED
Bonfanti, A.	Space Research Institute, Austrian Academy of Sciences, Austria	UNSPECIFIED	UNSPECIFIED
Salmon, S.	STAR, Université de Liège, Belgium	UNSPECIFIED	UNSPECIFIED
Singh, V.	INAF, Osservatorio Astrofisico di Catania, Italy	UNSPECIFIED	UNSPECIFIED
Santos, N. C.	Instituto de Astrofisica e Ciencias do Espaco, Universidade do Porto, CAUP, Rua das Estrelas, 4150-762 Porto, Portugal; Departamento de Fisica e Astronomia, Faculdade de Ciencias, Universidade do Porto, Rua Campo Alegre, 4169-007 Porto, Portugal	UNSPECIFIED	UNSPECIFIED
Sousa, S. G.	Instituto de Astrofisica e Ciencias do Espaco, Universidade do Porto, CAUP, Rua das Estrelas, 4150-762 Porto, Portugal	UNSPECIFIED	UNSPECIFIED
Alibert, Y.	Physikalisches Institut, University of Bern	UNSPECIFIED	UNSPECIFIED
Alonso, R.	Instituto de Astrofisica de Canarias (IAC), Via Lactea s/n 38200, La Laguna, Spain	UNSPECIFIED	UNSPECIFIED
Anglada Escudé, G.	Institut de Ciències de l’Espai (ICE, CSIC), Campus UAB, CanMagrans s/n, 08193 Bellaterra, Spain; Institut d’Estudis Espacials de Catalunya (IEEC), 08034 Barcelona,Spain	UNSPECIFIED	UNSPECIFIED
Bàrczy, T.	Admatis, Miskolc, Hungary	UNSPECIFIED	UNSPECIFIED
Barrado y Navascués, D.	Depto. de Astrofisica, Centro de Astrobiologia (CSIC-INTA), ESAC campus, E-28692 Villanueva de la Cañada (Madrid), Spain	UNSPECIFIED	UNSPECIFIED
Barros, S. C. C.	Instituto de Astrofisica e Ciencias do Espaco, Universidade do Porto, CAUP, Rua das Estrelas, 4150-762 Porto, Portugal	UNSPECIFIED	UNSPECIFIED
Baumjohann, W.	Space Research Institute, Austrian Academy of Sciences, Graz, Austria	UNSPECIFIED	UNSPECIFIED
Beck, M.	Observatoire de Genève, University of Geneva, Switzerland	UNSPECIFIED	UNSPECIFIED
Beck, T.	Center for Space and Habitability, University of Bern, Gesellschaftsstraße 6, 3012, Bern, Switzerland	UNSPECIFIED	UNSPECIFIED
Billot, N.	Observatoire de Genève, University of Geneva, Switzerland	UNSPECIFIED	UNSPECIFIED
Bonfils, X.	Institut de Planétologie et d'Astrophysique, University of Grenoble, France	UNSPECIFIED	UNSPECIFIED
Brandeker, A.	Department of Astronomy – Stockholm University, SE-106 91 Stockholm, Sweden	UNSPECIFIED	UNSPECIFIED
Broeg, C.	Physikalisches Institut, University of Bern, Bern, Switzerland	UNSPECIFIED	UNSPECIFIED
Cabrera, J.	UNSPECIFIED	https://orcid.org/0000-0001-6653-5487	UNSPECIFIED
Charnoz, S.	Université de Paris, Institut de physique du globe de Paris, CNRS, 75005, Paris, France	UNSPECIFIED	UNSPECIFIED
Collier Cameron, A.	SUPA, School of Physics and Astronomy, University of St. Andrews, North Haugh, Fife KY16 9SS, UK	UNSPECIFIED	UNSPECIFIED
Corral Van Damme, C.	ESA/ESTEC, Niederlande	UNSPECIFIED	UNSPECIFIED
Csizmadia, Sz.	UNSPECIFIED	https://orcid.org/0000-0001-6803-9698	UNSPECIFIED
Davies, M. B.	Lund Observatory, Department of Astronomy and Theoretical Physics, Lund University, 22100, Lund, Sweden	UNSPECIFIED	UNSPECIFIED
Deleuil, M.	Laboratoire d´Astrophysique de Marseille, France	UNSPECIFIED	UNSPECIFIED
Delrez, L.	Institut d Astrophysique et de Geophysique, Universite de Liege	UNSPECIFIED	UNSPECIFIED
Demory, B. -O.	Center for Space and Habitability, Gesellsschaftstrasse 6, 3012, Bern, Switzerland	UNSPECIFIED	UNSPECIFIED
Erikson, A.	UNSPECIFIED	UNSPECIFIED	UNSPECIFIED
Farinato, J.	INAF – Osservatorio Astronomico di Padova, Vicolo dell’Osservatorio 5, 35122 Padova, Italy	UNSPECIFIED	UNSPECIFIED
Fortier, A.	Physikalisches Institut, University of Bern, Bern, Switzerland	UNSPECIFIED	UNSPECIFIED
Fossati, L.	Space Research Institute, Austrian Academy of Sciences, Schmiedlstrasse 6, 8042, Graz, Austria	UNSPECIFIED	UNSPECIFIED
Fridlund, M.	Department of Space, Earth and Environment, Onsala Space Observatory, Chalmers University of Technology, SE-439 92, Onsala, Sweden; Leiden Observatory, University of Leiden, PO Box 9513, 2300 RA, Leiden, The Netherlands	UNSPECIFIED	UNSPECIFIED
Gandolfi, D.	Dipartimento di Fisica, Universita degli Studi di Torino, via Pietro Giuria 1, 10125, Torino, Italy	https://orcid.org/0000-0001-8627-9628	UNSPECIFIED
Gillon, M.	Institut d’Astrophysique, Geophysique et Oceanographie, Universite de Liege, B-4000 Liege, Belgium	UNSPECIFIED	UNSPECIFIED
Güdel, M.	Department of Astrophysics, University of Vienna, Tuerkenschanzstrasse 17, A-1180 Vienna, Austria	UNSPECIFIED	UNSPECIFIED
Hoyer, S.	Laboratoire d’Astrophysique de Marseille, Univ. de Provence, France	UNSPECIFIED	UNSPECIFIED
Isaak, K. G.	ESA/ESTEC, Noordwijk, Niederlande	UNSPECIFIED	UNSPECIFIED
Kiss, L. L.	Konkoly Observatory, Research Centre for Astronomy and Earth, Budapest, Hungary	UNSPECIFIED	UNSPECIFIED
Kopp, E.	Physikalisches Institut, University of Bern, Sidlerstrasse 5, CH-3012 Bern, Switzerland	UNSPECIFIED	UNSPECIFIED
Laskar, J.	IMCCE, UMR8028 CNRS, Observatoire de Paris, PSL Univ.,Sorbonne Univ., 77 av. Denfert-Rochereau, 75014 Paris, France	UNSPECIFIED	UNSPECIFIED
Lecavelier des Etangs, A.	Institut d’Astrophysique de Paris, France	UNSPECIFIED	UNSPECIFIED
Lovis, C.	Observatoire de l Universite de Geneve, 51 chemin des Maillettes, 1290 Sauverny, Switzerland	UNSPECIFIED	UNSPECIFIED
Magrin, D.	INAF – Osservatorio Astronomico di Padova, Vicolo dell’Osservatorio 5, 35122 Padova, Italy	UNSPECIFIED	UNSPECIFIED
Maxted, P. F. L.	Astrophysics Group, Keele University, Staffordshire ST5 5BG, UK	UNSPECIFIED	UNSPECIFIED
Mecina, M.	Department of Astrophysics, University of Vienna, Tuerkenschanzstrasse 17, 1180, Vienna, Austria	UNSPECIFIED	UNSPECIFIED
Nascimbeni, V.	INAF – Osservatorio Astronomico di Padova, vicolo dell Osservatorio 5, 35122 Padova, Italy	UNSPECIFIED	UNSPECIFIED
Olofsson, G.	Department of Astronomy, Stockholm University, AlbaNova University Center, 10691 Stockholm, Sweden	UNSPECIFIED	UNSPECIFIED
Ottensamer, R.	University of Vienna, Department of Astrophysics, Austria	UNSPECIFIED	UNSPECIFIED
Pagano, I.	INAF – Osservatorio Astrofisico di Catania, Via S.Sofia 78, 95123 Catania, Italy	UNSPECIFIED	UNSPECIFIED
Peter, G.	UNSPECIFIED	https://orcid.org/0000-0001-6101-2513	UNSPECIFIED
Piazza, D.	Physics Institute, Space Research & Planetary Sciences, University of Bern, Sidlerstr. 5, CH-3012 Bern, Switzerland	UNSPECIFIED	UNSPECIFIED
Piotto, G.	INAF – Osservatorio Astronomico di Padova, vicolo dell Osservatorio 5, 35122 Padova, Italy	UNSPECIFIED	UNSPECIFIED
Pollacco, D.	Department of Physics, University of Warwick, Coventry CV4 7AL, UK	UNSPECIFIED	UNSPECIFIED
Queloz, D.	Cavendish Laboratory, J J Thomson Avenue, Cambridge, CB3 0HE, UK	UNSPECIFIED	UNSPECIFIED
Ragazzoni, R.	INAF – Osservatorio Astronomico di Padova, Vicolo dell’Osservatorio 5, 35122 Padova, Italy	UNSPECIFIED	UNSPECIFIED
Rando, N.	ESA/ESTEC, Noordwijk, Niederlande	UNSPECIFIED	UNSPECIFIED
Rauer, H.	UNSPECIFIED	UNSPECIFIED	UNSPECIFIED
Ribas, I.	Institute d´Estudis Espacials de Catalunya and Instituto de Ciencias des Espacio, Barcelona, Spain	UNSPECIFIED	UNSPECIFIED
Scandariato, G.	INAF, Osservatorio Astrofisico di Catania, Via S. Sofia 78, I-95123 Catania, Italy	UNSPECIFIED	UNSPECIFIED
Segransan, D.	Observatoire astronomique de l Universite de Geneve	UNSPECIFIED	UNSPECIFIED
Simon, A. E.	Physikalisches Institut, University of Bern, Switzerland	UNSPECIFIED	UNSPECIFIED
Smith, A. M. S.	UNSPECIFIED	https://orcid.org/0000-0002-2386-4341	UNSPECIFIED
Steller, M.	Space Research Institute, Austrian Academy of Sciences, Schmiedlstrasse 6, 8042, Graz, Austria	UNSPECIFIED	UNSPECIFIED
Szabo, Gy. M.	Department of Experimental Physics & Astronomical Observatory, Szedeg, Hungary	UNSPECIFIED	UNSPECIFIED
Thomas, N.	Physikalisches Institut, University of Bern, Gesellsschaftstrasse 6, 3012, Bern, Switzerland	UNSPECIFIED	UNSPECIFIED
Udry, S.	Observatoire de Genève, Sauverny, Switzerland	UNSPECIFIED	UNSPECIFIED
Van Grootel, V.	STAR, Université de Liège, Belgium	UNSPECIFIED	UNSPECIFIED
Walton, N. A.	Institute of Astronomy, University of Cambridge, Cambridge, UK	UNSPECIFIED	UNSPECIFIED

Date:

December 2022

Journal or Publication Title:

Astronomy & Astrophysics

Refereed publication:

Yes

Open Access:

Yes

Gold Open Access:

In SCOPUS:

Yes

In ISI Web of Science:

Yes

Volume:

668

DOI:

10.1051/0004-6361/202244117

Page Range:

A93

Publisher:

EDP Sciences

ISSN:

0004-6361

Status:

Published

Keywords:

stars: individual: KELT-1, brown dwarfs, planetary systems, stars: atmospheres, methods: observational, Astrophysics - Earth and Planetary Astrophysics, Astrophysics - Instrumentation and Methods for Astrophysics

HGF - Research field:

Aeronautics, Space and Transport

HGF - Program:

Space

HGF - Program Themes:

Space Exploration

DLR - Research area:

Raumfahrt

DLR - Program:

R EW - Space Exploration

DLR - Research theme (Project):

R - CHEOPS Science, R - Project CHEOPS

Location:

Berlin-Adlershof

Institutes and Institutions:

Institute of Planetary Research > Extrasolar Planets and Atmospheres
Institute of Planetary Research > Leitungsbereich PF
Institute of Optical Sensor Systems > Space Instruments

Deposited By:

Smith, Dr Alexis M S

Deposited On:

20 Dec 2022 10:18

Last Modified:

06 Jan 2023 07:59

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