Article (Scientific journals)
High-precision multi-wavelength eclipse photometry of the ultra-hot gas giant exoplanet WASP-103 b
Delrez, Laetitia; Madhusudhan, Nikku; Lendl, Monika et al.
2018In Monthly Notices of the Royal Astronomical Society, 474 (2), p. 2334-2351
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Keywords :
Astrophysics - Earth and Planetary Astrophysics; Planetary systems; Planets and satellites: atmospheres; Stars: individual: WASP-103; Techniques: photometric; Techniques: radial velocities
Abstract :
[en] We present 16 occultation and three transit light curves for the ultra-short period hot Jupiter WASP-103b, in addition to five new radial velocity measurements. We combine these observations with archival data and perform a global analysis of the resulting extensive data set, accounting for the contamination from a nearby star. We detect the thermal emission of the planet in both the z' and KS bands, the measured occultation depths being 699±110 ppm (6.4σ) and 3567-350 +400 ppm (10.2σ), respectively. We use these two measurements, together with recently published HST/WFC3 data, to derive joint constraints on the properties of WASP- 103b's dayside atmosphere. On one hand, we find that the z' band and WFC3 data are best fit by an isothermal atmosphere at 2900K or an atmosphere with a low H2O abundance. On the other hand, we find an unexpected excess in the KS band measured flux compared to these models, which requires confirmation with additional observations before any interpretation can be given. From our global data analysis, we also derive a broad-band optical transmission spectrum that shows a minimum around 700 nm and increasing values towards both shorter and longer wavelengths. This is in agreement with a previous study based on a large fraction of the archival transit light curves used in our analysis. The unusual profile of this transmission spectrum is poorly matched by theoretical spectra and is not confirmed by more recent observations at higher spectral resolution. Additional data, in both emission and transmission, are required to better constrain the atmospheric properties of WASP-103b. © 2017 The Author(s).
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Delrez, Laetitia ;  Astrophysics Group, Cavendish Laboratory, J.J. Thomson Avenue, Cambridge, United Kingdom, Space sciences, Technologies and Astrophysics Research (STAR) Institute, Université de Liège, allée du 6 Aôut 17, Liège, Belgium
Madhusudhan, Nikku;  Institute of Astronomy, University of Cambridge, Cambridge, United Kingdom
Lendl, Monika;  Space Research Institute, Austrian Academy of Sciences, Schmiedlstr. 6, Graz, Austria, Observatoire de Genève, Université de Genève, 51 Chemin des Maillettes, Sauverny, Switzerland, Max Planck Institute for Astronomy, Königstuhl 17, Heidelberg, Germany
Gillon, Michaël  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa)
Anderson, David R.;  Astrophysics Group, Keele University, Staffordshire, United Kingdom
Neveu-VanMalle, Marion;  Observatoire de Genève, Université de Genève, 51 Chemin des Maillettes, Sauverny, Switzerland
Bouchy, François;  Observatoire de Genève, Université de Genève, 51 Chemin des Maillettes, Sauverny, Switzerland
Burdanov, Artem ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa)
Collier-Cameron, Andrew;  SUPA, School of Physics and Astronomy, University of St. Andrews, North Haugh, Fife, United Kingdom
Demory, Brice-Olivier;  Astrophysics Group, Cavendish Laboratory, J.J. Thomson Avenue, Cambridge, United Kingdom, University of Bern, Centre for Space and Habitability, Sidlerstrasse 5, Bern, Switzerland
Hellier, Coel;  Astrophysics Group, Keele University, Staffordshire, United Kingdom
Jehin, Emmanuel  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa)
Magain, Pierre  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa)
Maxted, Pierre F. L.;  Astrophysics Group, Keele University, Staffordshire, United Kingdom
Queloz, Didier;  Astrophysics Group, Cavendish Laboratory, J.J. Thomson Avenue, Cambridge, United Kingdom, Observatoire de Genève, Université de Genève, 51 Chemin des Maillettes, Sauverny, Switzerland
Smalley, Barry;  Astrophysics Group, Keele University, Staffordshire, United Kingdom
Triaud, Amaury H. M. J.;  Institute of Astronomy, University of Cambridge, Cambridge, United Kingdom
More authors (7 more) Less
Language :
English
Title :
High-precision multi-wavelength eclipse photometry of the ultra-hot gas giant exoplanet WASP-103 b
Publication date :
2018
Journal title :
Monthly Notices of the Royal Astronomical Society
ISSN :
0035-8711
eISSN :
1365-2966
Publisher :
Oxford University Press, Oxford, United Kingdom
Volume :
474
Issue :
2
Pages :
2334-2351
Peer reviewed :
Peer Reviewed verified by ORBi
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