2016A&A...596A..47S


C.D.S. - SIMBAD4 rel 1.7 - 2020.06.04CEST13:02:56

2016A&A...596A..47S - Astronomy and Astrophysics, volume 596A, 47-47 (2016/12-1)

Potassium detection in the clear atmosphere of a hot-Jupiter. FORS2 transmission spectroscopy of WASP-17b.

SEDAGHATI E., BOFFIN H.M.J., JERABKOVA T., GARCIA MUNOZ A., GRENFELL J.L., SMETTE A., IVANOV V.D., CSIZMADIA S., CABRERA J., KABATH P., ROCCHETTO M. and RAUER H.

Abstract (from CDS):

We present FORS2 (attached to ESO's Very Large Telescope) observations of the exoplanet WASP-17b during its primary transit, for the purpose of differential spectrophotometry analysis. We use the instrument in its Mask eXchange Unit (MXU) mode to simultaneously obtain low resolution spectra of the planet hosting star, as well as several reference stars in the field of view. The integration of these spectra within broadband and smaller 100Å bins provides us with "white" and spectrophotometric light curves, from 5700 to 8000Å. Through modelling the white light curve, we obtain refined bulk and transit parameters of the planet, as well as wavelength-dependent variations of the planetary radius from smaller spectral bins through which the transmission spectrum is obtained. The inference of transit parameters, as well as the noise statistics, is performed using a Gaussian Process model. We achieve a typical precision in the transit depth of a few hundred parts per million from various transit light curves. From the transmission spectra we rule out a flat spectrum at >3σ and detect marginal presence of the pressure-broadened sodium wings. Furthermore, we detect the wing of the potassium absorption line in the upper atmosphere of the planet with 3σ confidence, both facts pointing to a relatively shallow temperature gradient in the atmosphere. These conclusions are mostly consistent with previous studies of this exo-atmosphere, although previous potassium measurements have been inconclusive.

Abstract Copyright: © ESO, 2016

Journal keyword(s): planets and satellites: atmospheres - planets and satellites: individual: WASP-17b - techniques: spectroscopic - instrumentation: spectrographs - stars: individual: WASP-17 - methods: data analysis

VizieR on-line data: <Available at CDS (J/A+A/596/A47): lcdata.dat>

Status at CDS:  

Simbad objects: 8

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Number of rows : 8

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 WASP-19b Pl 09 53 40.0764883458 -45 39 33.055979403           ~ 239 1
2 * tau Boo b Pl 13 47 15.74340 +17 27 24.8552           ~ 232 1
3 WASP-17 * 15 59 50.9489706053 -28 03 42.309432433   11.83 11.59 11.31 10.92 F4 92 1
4 WASP-17b Pl 15 59 50.9489706053 -28 03 42.309432433           ~ 195 1
5 NAME G 139-21b Pl 17 15 18.9337265994 +04 57 50.064695682           ~ 527 1
6 HD 209458b Pl 22 03 10.7729598762 +18 53 03.548248479           ~ 1454 1
7 HD 209458 V* 22 03 10.7729598762 +18 53 03.548248479   8.21 7.63     F9V 990 1
8 * 51 Peg b Pl 22 57 27.9804167474 +20 46 07.782240714           ~ 523 1

    Equat.    Gal    SGal    Ecl

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2020.06.04-13:02:56

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