3 sigma 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 3 sigma 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."> 3 sigma 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 3 sigma 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."> Potassium detection in the clear atmosphere of a hot-Jupiter FORS2 tr…
Počet záznamů: 1  

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

  1. 1.
    0470385 - ASÚ 2017 RIV FR eng J - Článek v odborném periodiku
    Sedaghati, E. - Boffin, H.M.J. - Jeřábková, T. - Munoz, A.G. - Grenfell, J.L. - Smette, A. - Ivanov, V.D. - Csizmadia, S. - Cabrera, J. - Kabáth, Petr - Rocchetto, M. - Rauer, H.
    Potassium detection in the clear atmosphere of a hot-Jupiter FORS2 transmission spectroscopy of WASP-17b.
    Astronomy & Astrophysics. Roč. 596, December (2016), A47/1-A47/14. ISSN 0004-6361. E-ISSN 1432-0746
    Grant CEP: GA MŠMT LG14013
    Institucionální podpora: RVO:67985815
    Klíčová slova: planets * satellites * atmospheres
    Obor OECD: Astronomy (including astrophysics,space science)
    Impakt faktor: 5.014, rok: 2016

    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 100 angstrom bins provides us with "white" and spectrophotometric light curves, from 5700 to 8000 angstrom. 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 >3 sigma 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 3 sigma 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.
    Trvalý link: http://hdl.handle.net/11104/0268038

     
     
Počet záznamů: 1  

  Tyto stránky využívají soubory cookies, které usnadňují jejich prohlížení. Další informace o tom jak používáme cookies.