Reference : High-precision multi-wavelength eclipse photometry of the ultra-hot gas giant exoplan...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/216471
High-precision multi-wavelength eclipse photometry of the ultra-hot gas giant exoplanet WASP-103 b
English
Delrez, L. mailto [> >]
Madhusudhan, N. [> >]
Lendl, M. [> >]
Gillon, Michaël mailto [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa) >]
Anderson, D. R. [> >]
Neveu-VanMalle, M. [> >]
Bouchy, F. [> >]
Burdanov, Artem mailto [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa) >]
Collier-Cameron, A. [> >]
Demory, B.-O. [> >]
Hellier, C. [> >]
Jehin, Emmanuel mailto [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa) >]
Magain, Pierre mailto [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa) >]
Maxted, P. F. L. [> >]
Queloz, D. [> >]
Smalley, B. [> >]
Triaud, A. H. M. J. [> >]
1-Nov-2017
Monthly Notices of the Royal Astronomical Society
Blackwell Publishing
474
2
2334-2351
Yes (verified by ORBi)
International
0035-8711
1365-2966
Oxford
United Kingdom
[en] Astrophysics - Earth and Planetary Astrophysics
[en] We present sixteen occultation and three transit light curves for the ultra-short period hot Jupiter WASP-103 b, in addition to five new radial velocity measurements. We combine these observations with archival data and perform a global analysis of the resulting extensive dataset, accounting for the contamination from a nearby star. We detect the thermal emission of the planet in both the $z'$ and $K_{\mathrm{S}}$-bands, the measured occultation depths being 699$\pm$110 ppm (6.4-$\sigma$) and $3567_{-350}^{+400}$ ppm (10.2-$\sigma$), respectively. We use these two measurements together with recently published HST/WFC3 data to derive joint constraints on the properties of WASP-103 b's dayside atmosphere. On one hand, we find that the $z'$-band and WFC3 data are best fit by an isothermal atmosphere at 2900 K or an atmosphere with a low H$_2$O abundance. On the other hand, we find an unexpected excess in the $K_{\mathrm{S}}$-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, both in emission and transmission, are required to better constrain the atmospheric properties of WASP-103 b.
http://hdl.handle.net/2268/216471
http://adsabs.harvard.edu/abs/2017arXiv171102566D
19 pages, 11 figures, 7 tables

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