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The hot dayside and asymmetric transit of WASP-189b seen by CHEOPS | | M. Lendl
; Sz. Csizmadia
; A. Deline
; L. Fossati
; D. Kitzmann
; K. Heng
; S. Hoyer
; S. Salmon
; W. Benz
; C. Broeg
; D. Ehrenreich
; A. Fortier
; D. Queloz
; A. Bonfanti
; A. Brandeker
; A. Collier Cameron
; L. Delrez
; A. Garcia Muñoz
; M.J. Hooton
; P.F.L. Maxted
; B.M. Morris
; V. Van Grootel
; T.G. Wilson
; Y. Alibert
; R. Alonso
; J. Asquier
; T. Bandy T. Bárczy
; D. Barrado
; S.C.C Barros
; W. Baumjohann
; M. Beck
; T. Beck
; A. Bekkelien
; M. Bergomi
; N. Billot
; F. Biondi
; X. Bonfils
; V. Bourrier
; M-D. Busch
; J. Cabrera
; V. Cessa
; S. Charnoz
; B. Chazelas
; C. Corral Van Damme
; M.B. Davies
; M. Deleuil
; O.D.S Demangeon
; B.-O. Demory
; A. Erikson
; J. Farinato
; M. Fridlund
; D. Futyan
; D. Gandolfi
; M. Gillon
; P. Guterman
; J. Hasiba
; E. Hernandez
; K.G. Isaak
; L. Kiss
; T. Kuntzer
; A. Lecavelier des Etangs
; T. Lüftinger
; J. Laskar
; C. Lovis
; D. Magrin
; L. Malvasio
; L. Marafatto
; H. Michaelis
; M. Munari
; V. Nascimbeni
; G. Olofsson
; H. Ottacher
; R. Ottensamer
; I. Pagano
; E. Pallé
; G. Peter
; D. Piazza
; G. Piotto
; D. Pollacco
; F. Ratti
; H. Rauer
; R. Ragazzoni
; N. Rando
; I. Ribas
; M. Rieder
; R. Rohlfs
; F. Safa
; N.C. Santos
; G. Scandariato
; D. Ségransan
; A.E. Simon
; V. Singh
; A.M.S. Smith
; M. Sordet
; S.G. Sousa
; M. Steller
; Gy.M. Szabó
; N. Thomas
; M. Tschentscher
; S. Udry
; V. Viotto
; I. Walter
; N.A. Walton
; F. Wildi
; D. Wolter
; | | Date: |
28 Sep 2020 | | Abstract: | The CHEOPS space mission dedicated to exoplanet follow-up was launched in
December 2019, equipped with the capacity to perform photometric measurements
at the 20 ppm level. As CHEOPS carries out its observations in a broad optical
passband, it can provide insights into the reflected light from exoplanets and
constrain the short-wavelength thermal emission for the hottest of planets by
observing occultations and phase curves. Here, we report the first CHEOPS
observation of an occultation, namely, that of the hot Jupiter WASP-189b, a
$M_P approx 2 M_J$ planet orbiting an A-type star. We detected the occultation
of WASP-189 b at high significance in individual measurements and derived an
occultation depth of $dF = 87.9 pm 4.3$ppm based on four occultations. We
compared these measurements to model predictions and we find that they are
consistent with an unreflective atmosphere heated to a temperature of $3435 pm
27$K, when assuming inefficient heat redistribution. Furthermore, we present
two transits of WASP-189b observed by CHEOPS. These transits have an asymmetric
shape that we attribute to gravity darkening of the host star caused by its
high rotation rate. We used these measurements to refine the planetary
parameters, finding a $sim25\%$ deeper transit compared to the discovery paper
and updating the radius of WASP-189b to $1.619pm0.021 R_J$. We further
measured the projected orbital obliquity to be $lambda =
86.4^{+2.9}_{-4.4}$deg, a value that is in good agreement with a previous
measurement from spectroscopic observations, and derived a true obliquity of
$Psi = 85.4pm4.3$deg. Finally, we provide reference values for the
photometric precision attained by the CHEOPS satellite: for the V=6.6 mag star,
and using a one-hour binning, we obtain a residual RMS between 10 and 17ppm on
the individual light curves, and 5.7ppm when combining the four visits. | | Source: | arXiv, 2009.13403 | | Services: | Forum | Review | PDF | Favorites | |
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