Article (Scientific journals)
Spi-OPS: Spitzer and CHEOPS confirm the near-polar orbit of MASCARA-1 b and reveal a hint of dayside reflection
Hooton, M. J.; Hoyer, S.; Kitzmann, D. et al.
2022In Astronomy and Astrophysics, p. 2109.05031
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Keywords :
Astrophysics - Instrumentation and Methods for Astrophysics
Abstract :
[en] The light curves of tidally-locked hot Jupiters transiting fast-rotating, early type stars are a rich source of information about both planet and star, with full-phase coverage enabling a detailed atmospheric characterisation of the planet. Although it is possible to determine the true spin-orbit angle $\Psi$, a notoriously difficult parameter to measure, from any transit asymmetry resulting from gravity darkening induced by the stellar rotation, the correlations that exist between the transit parameters have led to large disagreements in published values of $\Psi$ for some systems. We aimed to study these phenomena in the light curves of the ultra-hot Jupiter MASCARA-1 b. We obtained optical CHEOPS transit and occultation light curves of MASCARA-1 b, and analysed them jointly with a Spitzer/IRAC 4.5 µm full-phase curve. When fitting the CHEOPS and Spitzer transits together, the degeneracies are greatly diminished and return results consistent with previously published Doppler tomography. Placing priors informed by the tomography achieves even better precision, allowing a determination of $\Psi=72.1^{+2.5}_{-2.4}$ deg. From the occultations and phase variations we derived dayside and nightside temperatures of $3062^{+66}_{-68}$ K and $1720\pm330$ K, respectively. In addition, we can separately derive geometric albedo $A_g=0.171^{+0.066}_{-0.068}$ and spherical albedo $A_s=0.266^{+0.097}_{-0.100}$ from the CHEOPS data, and Bond albedo $A_B=0.057^{+0.083}_{-0.101}$ from the Spitzer phase curve. Where possible, priors informed by Doppler tomography should be used when fitting transits of fast-rotating stars, though multi-colour photometry may also unlock an accurate measurement of $\Psi$. Our approach to modelling the phase variations at different wavelengths provides a template for how to separate thermal emission from reflected light in spectrally-resolved JWST phase curve data.
Research center :
STAR - Space sciences, Technologies and Astrophysics Research - ULiège
Astrobiology - ULiège
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Hooton, M. J.
Hoyer, S.
Kitzmann, D.
Morris, B. M.
Smith, A. M. S.
Collier Cameron, A.
Futyan, D.
Maxted, P. F. L.
Queloz, D.
Demory, B.-O.
Heng, K.
Lendl, M.
Cabrera, J.
Csizmadia, Sz
Deline, A.
Parviainen, H.
Salmon, Sébastien ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie
Sulis, S.
Wilson, T. G.
Bonfanti, A.
Brandeker, A.
Demangeon, O. D. S.
Oshagh, M.
Persson, C. M.
Scandariato, G.
Alibert, Y.
Alonso, R.
Anglada Escudé, G.
Bárczy, T.
Barrado, D.
Barros, S. C. C.
Baumjohann, W.
Beck, M.
Beck, T.
Benz, W.
Billot, N.
Bonfils, X.
Bourrier, V.
Broeg, C.
Busch, M.-D.
Charnoz, S.
Davies, M. B.
Deleuil, M.
Delrez, Laetitia ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Exotic
Ehrenreich, D.
Erikson, A.
Farinato, J.
Fortier, A.
Fossati, L.
Fridlund, M.
Gandolfi, D.
Gillon, Michaël  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Exotic
Güdel, M.
Isaak, K. G.
Jones, K.
Kiss, L.
Laskar, J.
Lecavelier des Etangs, A.
Lovis, C.
Luntzer, A.
Magrin, D.
Nascimbeni, V.
Olofsson, G.
Ottensamer, R.
Pagano, I.
Pallé, E.
Peter, G.
Piotto, G.
Pollacco, D.
Ragazzoni, R.
Rando, N.
Ratti, F.
Rauer, H.
Ribas, I.
Santos, N. C.
Ségransan, D.
Simon, Antoine
Sousa, S. G.
Steller, M.
Szabó, Gy M.
Thomas, N.
Udry, S.
Ulmer, B.
Van Grootel, Valérie  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie
Walton, N. A.
More authors (75 more) Less
Language :
English
Title :
Spi-OPS: Spitzer and CHEOPS confirm the near-polar orbit of MASCARA-1 b and reveal a hint of dayside reflection
Publication date :
2022
Journal title :
Astronomy and Astrophysics
ISSN :
0004-6361
eISSN :
1432-0746
Publisher :
EDP Sciences, Les Ulis, France
Pages :
arXiv:2109.05031
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 12 October 2021

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