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CHEOPS observations...
CHEOPS observations of KELT-20 b/MASCARA-2 b: An aligned orbit and signs of variability from a reflective day side
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- Singh, V. (author)
- Istituto nazionale di astrofisica (INAF),Osservatorio Astrofisico di Catania
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- Scandariato, Gaetano (author)
- Istituto nazionale di astrofisica (INAF)
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- Smith, A. M.S. (author)
- Deutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR)
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show more...
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- Cubillos, P. E. (author)
- Istituto nazionale di astrofisica (INAF)
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- Lendl, M. (author)
- Université de Genève,University of Geneva
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- Billot, N. (author)
- Université de Genève,University of Geneva
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- Fortier, A. (author)
- Universität Bern,University of Bern
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- Queloz, D. (author)
- University Of Cambridge,Eidgenössische Technische Hochschule Zürich (ETH),Swiss Federal Institute of Technology in Zürich (ETH)
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- Sousa, S. G. (author)
- Universidade do Porto,University of Porto
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- Csizmadia, Szilard (author)
- Deutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR)
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- Brandeker, Alexis, 1974- (author)
- Stockholms universitet,Institutionen för astronomi
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Carone, L. (author)
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- Wilson, T.G. (author)
- The University of Warwick
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- Akinsanmi, B. (author)
- Université de Genève,University of Geneva
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- Patel, Jayshil Ashokkumar, 1997- (author)
- Stockholms universitet,Institutionen för astronomi
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Krenn, A. (author)
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- Demangeon, O. (author)
- Universidade do Porto,University of Porto
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- Bruno, G. (author)
- Istituto nazionale di astrofisica (INAF)
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- Pagano, I. (author)
- Istituto nazionale di astrofisica (INAF)
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- Hooton, M.J. (author)
- University Of Cambridge
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- Cabrera, J. (author)
- Deutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR)
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- Santos, N. C. (author)
- Universidade do Porto,University of Porto
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- Alibert, Y. (author)
- Universität Bern,University of Bern
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- Alonso, R. (author)
- Universidad de la Laguna,University of La Laguna,Instituto de Astrofísica de Canarias
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- Asquier, J. (author)
- European Space Research and Technology Centre (ESA ESTEC)
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Bárczy, T. (author)
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- Navascues, D. Barrado (author)
- Centro de Astrobiologia (CAB)
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- Barros, S.C.C. (author)
- Universidade do Porto,University of Porto
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Baumjohann, W. (author)
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- Davies, M.B. (author)
- Lund University,Lunds universitet,Matematik (naturvetenskapliga fakulteten),Matematikcentrum,Institutioner vid LTH,Lunds Tekniska Högskola,LU profilområde: Naturlig och artificiell kognition,Lunds universitets profilområden,Mathematics (Faculty of Sciences),Centre for Mathematical Sciences,Departments at LTH,Faculty of Engineering, LTH,LU Profile Area: Natural and Artificial Cognition,Lund University Profile areas
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- Beck, T. (author)
- Universität Bern,University of Bern
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- Benz, W. (author)
- Universität Bern,University of Bern
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- Bergomi, M. (author)
- Istituto nazionale di astrofisica (INAF)
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Bonfanti, A. (author)
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Bonfils, X. (author)
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- Borsato, L. (author)
- Istituto nazionale di astrofisica (INAF)
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- Broeg, C. (author)
- Universität Bern,University of Bern
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- Charnoz, S. (author)
- Institut de Physique du Globe de Paris
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- Collier Cameron, A. (author)
- University of St Andrews
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- Davies, M. B. (author)
- Lunds universitet,Lund University
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- Deleuil, M. (author)
- Laboratoire d'Astrophysique de Marseille
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- Deline, A. (author)
- Université de Genève,University of Geneva
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- Delrez, L. (author)
- Universite de Liège,University of Liège
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- Demory, B.O. (author)
- Universität Bern,University of Bern
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- Ehrenreich, D. (author)
- Université de Genève,University of Geneva
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- Erikson, Anders (author)
- Deutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR)
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Fossati, L. (author)
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- Fridlund, Malcolm, 1952 (author)
- Chalmers tekniska högskola,Chalmers University of Technology,Universiteit Leiden (UL),Leiden University (UL)
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- Gandolfi, D. (author)
- Universita degli Studi di Torino,University of Turin
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- Gillon, Michaël (author)
- Universite de Liège,University of Liège
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- Gudel, M. (author)
- Universität Wien,University of Vienna
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- Günther, Maximilian N. (author)
- European Space Research and Technology Centre (ESA ESTEC)
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- Harre, J. V. (author)
- Deutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR)
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- Heitzmann, A. (author)
- Université de Genève,University of Geneva
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- Helling, Ch. (author)
- Technische Universität Graz
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- Hoyer, S. (author)
- Laboratoire d'Astrophysique de Marseille
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- Isaak, K. (author)
- European Space Research and Technology Centre (ESA ESTEC)
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- Kiss, L. L. (author)
- Eötvös Loránd University (ELTE),Magyar Tudomanyos Akademia,Hungarian Academy of Sciences
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- Lam, K. W.F. (author)
- Deutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR)
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- Laskar, J. (author)
- Observatoire de Paris,Paris Observatory
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- des Etangs, A. L. (author)
- Centre national de la recherche scientifique (CNRS)
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- Magrin, D. (author)
- Istituto nazionale di astrofisica (INAF)
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- Maxted, P. (author)
- Keele University
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- Mischler, H. (author)
- Universität Bern,University of Bern
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- Mordasini, C. (author)
- Universität Bern,University of Bern
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- Nascimbeni, Valerio (author)
- Istituto nazionale di astrofisica (INAF)
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- Olofsson, Göran, 1944- (author)
- Stockholms universitet,Institutionen för astronomi
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- Ottensamer, R. (author)
- Universität Wien,University of Vienna
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- Palle, Enric (author)
- Instituto de Astrofísica de Canarias,Universidad de la Laguna,University of La Laguna
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- Peter, G. (author)
- Deutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR)
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- Piotto, Giampaolo P. (author)
- Università Degli Studi di Padova,University of Padua,Istituto nazionale di astrofisica (INAF)
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- Pollacco, D. (author)
- The University of Warwick
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- Ragazzoni, R. (author)
- Università Degli Studi di Padova,University of Padua,Istituto nazionale di astrofisica (INAF)
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- Rando, N. (author)
- European Space Research and Technology Centre (ESA ESTEC)
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- Rauer, H. (author)
- Deutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR),Technische Universität Berlin,Freie Universität Berlin
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- Ribas, I. (author)
- Institut de Ciències de l'Espai (ICE) - CSIC,Institute of Space Sciences (ICE) - CSIC,Institut d'Estudis Espacials de Catalunya (IEEC),Institute of Space Studies of Catalonia (IEEC)
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- Salmon, S. (author)
- Université de Genève,University of Geneva
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- Segransan, D. (author)
- Université de Genève,University of Geneva
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- Simon, A.E. (author)
- Universität Bern,University of Bern
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- Stalport, M. (author)
- Universite de Liège,University of Liège
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Steinberger, M. (author)
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- Szabó, G.M. (author)
- Eötvös Loránd University (ELTE)
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- Thomas, Nicolas (author)
- Universität Bern,University of Bern
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- Udry, S. (author)
- Université de Genève,University of Geneva
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- Ulmer, B. (author)
- Deutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR)
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- Van Grootel, V. (author)
- Universite de Liège,University of Liège
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- Venturini, J. (author)
- Université de Genève,University of Geneva
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- Villaver, E. (author)
- Universidad de la Laguna,University of La Laguna,Instituto de Astrofísica de Canarias
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- Walton, N. A. (author)
- University Of Cambridge
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- Zingales, Tiziano (author)
- Università Degli Studi di Padova,University of Padua,Istituto nazionale di astrofisica (INAF),University of Padova,INAF - Osservatorio Astronomico di Padova
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(creator_code:org_t)
- 2024
- 2024
- English.
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In: Astronomy and Astrophysics. - 0004-6361 .- 1432-0746. ; 683
- Related links:
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https://research.cha... (primary) (free)
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http://dx.doi.org/10... (free)
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https://doi.org/10.1...
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https://doi.org/10.1...
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https://research.cha...
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https://lup.lub.lu.s...
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https://urn.kb.se/re...
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Abstract
Subject headings
Close
- Context. Occultations are windows of opportunity to indirectly peek into the dayside atmosphere of exoplanets. High-precision transit events provide information on the spin-orbit alignment of exoplanets around fast-rotating hosts. Aims. We aim to precisely measure the planetary radius and geometric albedo of the ultra-hot Jupiter (UHJ) KELT-20 b along with the spin-orbit alignment of the system. Methods. We obtained optical high-precision transits and occultations of KELT-20 b using CHEOPS observations in conjunction with simultaneous TESS observations. We interpreted the occultation measurements together with archival infrared observations to measure the planetary geometric albedo and dayside temperatures. We further used the host star's gravity-darkened nature to measure the system's obliquity. Results. We present a time-averaged precise occultation depth of 82 ± 6 ppm measured with seven CHEOPS visits and 131-7+8 from the analysis of all available TESS photometry. Using these measurements, we precisely constrain the geometric albedo of KELT-20 b to 0.26 ± 0.04 and the brightness temperature of the dayside hemisphere to 2566-80+77 K. Assuming Lambertian scattering law, we constrain the Bond albedo to 0.36-0.05+0.04 along with a minimal heat transfer to the night side (Ïμ = 0.14-0.10+0.13). Furthermore, using five transit observations we provide stricter constraints of 3 9 ± 1 1 deg on the sky-projected obliquity of the system. Conclusions. The aligned orbit of KELT-20 b is in contrast to previous CHEOPS studies that have found strongly inclined orbits for planets orbiting other A-type stars. The comparably high planetary geometric albedo of KELT-20 b corroborates a known trend of strongly irradiated planets being more reflective. Finally, we tentatively detect signs of temporal variability in the occultation depths, which might indicate variable cloud cover advecting onto the planetary day side.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- Planets and satellites: gaseous planets
- Planets and satellites: individual: KELT-20 b
- Techniques: photometric
- Planets and satellites: individual: MASCARA-2 b
- Planets and satellites: atmospheres
- Planets and satellites: atmospheres
- Planets and satellites: gaseous planets
- Planets and satellites: individual: KELT-20 b
- Planets and satellites: individual: MASCARA-2 b
- Techniques: photometric
- Exoplanets
- Geometry
- Heat transfer
- Photometry
- Satellites
- Solar radiation
- Stars
- Exo-planets
- Geometric albedos
- Planet and satellite: gaseous planet
- Planet and satellite: individual: KELT-20 b
- Planet and satellite: individual: MASCARA-2 b
- Planets and satellites
- Planets and satellites: individual
- Orbits
Publication and Content Type
- art (subject category)
- ref (subject category)
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To the university's database
- By the author/editor
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Singh, V.
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Scandariato, Gae ...
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Smith, A. M.S.
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Cubillos, P. E.
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Lendl, M.
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Billot, N.
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show more...
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Fortier, A.
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Queloz, D.
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Sousa, S. G.
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Csizmadia, Szila ...
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Brandeker, Alexi ...
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Carone, L.
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Wilson, T.G.
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Akinsanmi, B.
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Patel, Jayshil A ...
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Krenn, A.
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Demangeon, O.
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Bruno, G.
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Pagano, I.
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Hooton, M.J.
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Cabrera, J.
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Santos, N. C.
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Alibert, Y.
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Alonso, R.
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Asquier, J.
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Bárczy, T.
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Navascues, D. Ba ...
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Barros, S.C.C.
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Baumjohann, W.
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Davies, M.B.
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Beck, T.
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Benz, W.
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Bergomi, M.
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Bonfanti, A.
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Bonfils, X.
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Borsato, L.
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Broeg, C.
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Charnoz, S.
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Collier Cameron, ...
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Davies, M. B.
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Deleuil, M.
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Deline, A.
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Delrez, L.
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Demory, B.O.
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Ehrenreich, D.
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Erikson, Anders
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Fossati, L.
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Fridlund, Malcol ...
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Gandolfi, D.
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Gillon, Michaël
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Gudel, M.
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Günther, Maximil ...
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Harre, J. V.
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Heitzmann, A.
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Helling, Ch.
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Hoyer, S.
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Isaak, K.
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Kiss, L. L.
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Lam, K. W.F.
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Laskar, J.
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des Etangs, A. L ...
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Magrin, D.
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Maxted, P.
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Mischler, H.
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Mordasini, C.
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Nascimbeni, Vale ...
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Olofsson, Göran, ...
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Ottensamer, R.
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Palle, Enric
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Peter, G.
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Piotto, Giampaol ...
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Pollacco, D.
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Ragazzoni, R.
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Rando, N.
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Rauer, H.
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Ribas, I.
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Salmon, S.
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Segransan, D.
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Simon, A.E.
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Stalport, M.
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Steinberger, M.
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Szabó, G.M.
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Thomas, Nicolas
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Udry, S.
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Ulmer, B.
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Van Grootel, V.
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Venturini, J.
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Villaver, E.
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Walton, N. A.
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Zingales, Tizian ...
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- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Astronomy Astrop ...
- Articles in the publication
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Astronomy and As ...
- By the university
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Chalmers University of Technology
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Lund University
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Stockholm University