CHEOPS observations confirm nodal precession in the WASP-33 system
Artikel i vetenskaplig tidskrift, 2025
Aims. We aim to observe the transits and occultations of WASP-33 b, which orbits a rapidly rotating δ Scuti pulsator, with the goal of measuring the orbital obliquity via the gravity-darkening effect, and constraining the geometric albedo via the occultation depth. Methods. We observed four transits and four occultations with CHEOPS, and employ a variety of techniques to remove the effects of the stellar pulsations from the light curves, as well as the usual CHEOPS systematic effects. We also performed a comprehensive analysis of low-resolution spectral and Gaia data to re-determine the stellar properties of WASP-33. Results. We measure an orbital obliquity 111.3+−00.27 degrees, which is consistent with previous measurements made via Doppler tomography. We also measure the planetary impact parameter, and confirm that this parameter is undergoing rapid secular evolution as a result of nodal precession of the planetary orbit. This precession allows us to determine the second-order fluid Love number of the star, which we find agrees well with the predictions of theoretical stellar models. We are unable to robustly measure a unique value of the occultation depth, and emphasise the need for long-baseline observations to better measure the pulsation periods.
planets and satellites: gaseous planets
planets and satellites: dynamical evolution and stability
planets and satellites: fundamental parameters
stars: oscillations
planets and satellites: individual: WASP-33 b
stars: individual: WASP-33
Författare
A. M.S. Smith
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
Szilard Csizmadia
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
V. Van Grootel
Universite de Liège
M. Lendl
Université de Genève
Carina Persson
Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik
G. Olofsson
Stockholms universitet
D. Ehrenreich
Université de Genève
Maximilian N. Günther
European Space Research and Technology Centre (ESA ESTEC)
A. Heitzmann
Université de Genève
S.C.C. Barros
Universidade do Porto
A. Bonfanti
Institut fur Weltraumforschung
A. Brandeker
Stockholms universitet
J. Cabrera
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
O. Demangeon
Universidade do Porto
L. Fossati
Institut fur Weltraumforschung
J. V. Harre
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
M.J. Hooton
University of Cambridge
S. Hoyer
Laboratoire d'Astrophysique de Marseille
S. Z. Kalman
Eötvös Loránd University (ELTE)
Magyar Tudomanyos Akademia
S. Salmon
Université de Genève
S.G. Sousa
Universidade do Porto
Gy M. Szabó
Eötvös Loránd University (ELTE)
T.G. Wilson
The University of Warwick
Y. Alibert
Universität Bern
Physics Institute
R. Alonso
Instituto de Astrofísica de Canarias
Universidad de la Laguna
J. Asquier
European Space Research and Technology Centre (ESA ESTEC)
T. Bárczy
Admatis
D. Barrado
Centro de Astrobiologia (CAB)
W. Baumjohann
Institut fur Weltraumforschung
W. Benz
Universität Bern
Physics Institute
N. Billot
Université de Genève
L. Borsato
Istituto nazionale di astrofisica (INAF)
C. Broeg
Physics Institute
Universität Bern
A. Collier Cameron
University of St Andrews
A. Correia
Centre for Physics of the University of Coimbra
P. E. Cubillos
Istituto nazionale di astrofisica (INAF)
Institut fur Weltraumforschung
Melvyn B. Davies
Lunds universitet
M. Deleuil
Laboratoire d'Astrophysique de Marseille
A. Deline
Université de Genève
B.O. Demory
Universität Bern
Physics Institute
A. Derekas
Eötvös Loránd University (ELTE)
Billy Edwards
Netherlands Institute for Space Research (SRON)
J. A. Egger
Physics Institute
Anders Erikson
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
A. Fortier
Universität Bern
Physics Institute
Malcolm Fridlund
Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik
Universiteit Leiden
D. Gandolfi
Universita degli Studi di Torino
K. Gazeas
University of Athens
Michaël Gillon
Universite de Liège
M. Gudel
Universität Wien
J. Hasiba
Institut fur Weltraumforschung
Ch. Helling
Technische Universität Graz
Institut fur Weltraumforschung
K. Isaak
European Space Research and Technology Centre (ESA ESTEC)
L. L. Kiss
Eötvös Loránd University (ELTE)
Magyar Tudomanyos Akademia
Judith Korth
Lunds universitet
K. W.F. Lam
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
J. Laskar
Observatoire de Paris
A. L. des Etangs
Institut d 'Astrophysique de Paris
D. Magrin
Istituto nazionale di astrofisica (INAF)
P. Maxted
Keele University
Bruno Merín
European Space Astronomy Centre (ESAC)
C. Mordasini
Physics Institute
Universität Bern
Valerio Nascimbeni
Istituto nazionale di astrofisica (INAF)
R. Ottensamer
Universität Wien
I. Pagano
Istituto nazionale di astrofisica (INAF)
Enric Palle
Instituto de Astrofísica de Canarias
G. Peter
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
D. Piazza
Universität Bern
Giampaolo P. Piotto
Università di Padova
Istituto nazionale di astrofisica (INAF)
Don L. Pollacco
D. Queloz
Eidgenössische Technische Hochschule Zürich (ETH)
University of Cambridge
Roberto Ragazzoni
Istituto nazionale di astrofisica (INAF)
Università di Padova
N. Rando
European Space Research and Technology Centre (ESA ESTEC)
H. Rauer
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
Freie Universität Berlin
I. Ribas
Institut de Ciències de l'Espai (ICE) - CSIC
Institut d'Estudis Espacials de Catalunya (IEEC)
N. C. Santos
Universidade do Porto
Gaetano Scandariato
Istituto nazionale di astrofisica (INAF)
D. Segransan
Université de Genève
A.E. Simon
Universität Bern
Physics Institute
M. Stalport
Universite de Liège
S. Sulis
Laboratoire d'Astrophysique de Marseille
S. Udry
Université de Genève
S. Ulmer-Moll
Universite de Liège
Université de Genève
Physics Institute
J. Venturini
Université de Genève
E. Villaver
Instituto de Astrofísica de Canarias
V. Viotto
Istituto nazionale di astrofisica (INAF)
I. Walter
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
N. A. Walton
University of Cambridge
S. Wolf
Universität Bern
Astronomy and Astrophysics
0004-6361 (ISSN) 1432-0746 (eISSN)
Vol. 693 A128Ämneskategorier (SSIF 2025)
Astronomi, astrofysik och kosmologi
DOI
10.1051/0004-6361/202452151
Relaterade dataset
WASP-33 CHEOPS light curves : J/A+A/693/A128 [dataset]
URI: https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/693/A128