Bibcode
Gillon, M.; Triaud, A. H. M. J.; Fortney, J. J.; Demory, B.-O.; Jehin, E.; Lendl, M.; Magain, P.; Kabath, P.; Queloz, D.; Alonso, R.; Anderson, D. R.; Collier Cameron, A.; Fumel, A.; Hebb, L.; Hellier, C.; Lanotte, A.; Maxted, P. F. L.; Mowlavi, N.; Smalley, B.
Bibliographical reference
Astronomy and Astrophysics, Volume 542, id.A4
Advertised on:
6
2012
Journal
Citations
175
Refereed citations
169
Description
We present twenty-three transit light curves and seven occultation light
curves for the ultra-short period planet WASP-43 b, in addition to eight
new measurements of the radial velocity of the star. Thanks to this
extensive data set, we improve significantly the parameters of the
system. Notably, the largely improved precision on the stellar density
(2.41 ± 0.08 ρ&sun;) combined with constraining
the age to be younger than a Hubble time allows us to break the
degeneracy of the stellar solution mentioned in the discovery paper. The
resulting stellar mass and size are 0.717 ± 0.025
M&sun; and 0.667 ± 0.011 R&sun;. Our
deduced physical parameters for the planet are 2.034 ± 0.052
MJup and 1.036 ± 0.019 RJup. Taking into
account its level of irradiation, the high density of the planet favors
an old age and a massive core. Our deduced orbital eccentricity,
0.0035-0.0025+0.0060, is consistent with a fully
circularized orbit. We detect the emission of the planet at 2.09 μm
at better than 11-σ, the deduced occultation depth being 1560
± 140 ppm. Our detection of the occultation at 1.19 μm is
marginal (790 ± 320 ppm) and more observations are needed to
confirm it. We place a 3-σ upper limit of 850 ppm on the depth of
the occultation at ~0.9 μm. Together, these results strongly favor a
poor redistribution of the heat to the night-side of the planet, and
marginally favor a model with no day-side temperature inversion.
Based on data collected with the TRAPPIST and Euler telescopes at ESO La
Silla Observatory, Chile, and with the VLT/HAWK-I instrument at ESO
Paranal Observatory, Chile (program 086.C-0222).Tables 1 and 4 are
available in electronic form at http://www.aanda.orgPhotometry is only
available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr
(130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/542/A4