2015A&A...584A..75V


C.D.S. - SIMBAD4 rel 1.7 - 2021.01.16CET11:53:30

2015A&A...584A..75V - Astronomy and Astrophysics, volume 584A, 75-75 (2015/12-1)

A temperature inversion in WASP-33b? . Large Binocular Telescope occultation data confirm significant thermal flux at short wavelengths.

VON ESSEN C., MALLONN M., ALBRECHT S., ANTOCI V., SMITH A.M.S., DREIZLER S. and STRASSMEIER K.G.

Abstract (from CDS):

We observed a secondary eclipse of WASP-33 b quasi-simultaneously in the optical (∼0.55µm) and the near-infrared (∼1.05µm) using the 2x8.4m Large Binocular Telescope. WASP-33 is a δ Scuti star pulsating with periods comparable to the eclipse duration, making the determination of the eclipse depth challenging. We use previously determined oscillation frequencies to model and remove the pulsation signal from the light curves, isolating the secondary eclipse. The determined eclipse depth is ΔF=1.03±0.34 parts per thousand, corresponding to a brightness temperature of TB=3398±302K. Combining previously published data with our new measurement we find the equilibrium temperature of WASP-33 b to be TB=3358±165K. We compare all existing eclipse data to a blackbody spectrum, to a carbon-rich non-inverted model and to a solar composition model with an inverted temperature structure. We find that current available data on WASP-33 b's atmosphere can be best represented by a simple blackbody emission, without the need for more sophisticated atmospheric models with temperature inversions. Although our data cannot rule out models with or without a temperature inversion, they do confirm a high brightness temperature for the planet at short wavelengths. WASP-33 b is one of the hottest exoplanets known till date, and its equilibrium temperature is consistent with rapid reradiation of the absorbed stellar light and a low albedo.

Abstract Copyright:

Journal keyword(s): asteroseismology - techniques: photometric - occultations - stars: oscillations - planets and satellites: atmospheres - methods: observational

Simbad objects: 7

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Number of rows : 7

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 BD+36 487 * 02 26 30.1256604713 +37 24 22.609386496   10.16 9.17     G5 3 0
2 BD+36 488 * 02 26 35.6642751369 +37 35 47.876310337   9.75 9.37     F0 7 0
3 HD 15082b Pl 02 26 51.0582746497 +37 33 01.737746137           ~ 210 1
4 HD 15082 dS* 02 26 51.0582746497 +37 33 01.737746137   8.41 8.14     kA5hA8mF4 142 1
5 BD+36 493 * 02 27 34.8242273172 +37 28 08.206249362   10.37 9.45 8.9   G5 4 0
6 WASP-12b Pl 06 30 32.7966788910 +29 40 20.266334158           G0 581 1
7 HD 209458b Pl 22 03 10.7729598762 +18 53 03.548248479           ~ 1534 1

    Equat.    Gal    SGal    Ecl

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2021.01.16-11:53:30

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