2018A&A...616A.145C


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.14CEST18:23:17

2018A&A...616A.145C - Astronomy and Astrophysics, volume 616A, 145-145 (2018/8-1)

The GTC exoplanet transit spectroscopy survey. IX. Detection of haze, Na, K, and Li in the super-Neptune WASP-127b.

CHEN G., PALLE E., WELBANKS L., PRIETO-ARRANZ J., MADHUSUDHAN N., GANDHI S., CASASAYAS-BARRIS N., MURGAS F., NORTMANN L., CROUZET N., PARVIAINEN H. and GANDOLFI D.

Abstract (from CDS):

Exoplanets with relatively clear atmospheres are prime targets for detailed studies of chemical compositions and abundances in their atmospheres. Alkali metals have long been suggested to exhibit broad wings due to pressure broadening, but most of the alkali detections only show very narrow absorption cores, probably because of the presence of clouds. We report the strong detection of the pressure-broadened spectral profiles of Na, K, and Li absorption in the atmosphere of the super-Neptune WASP-127b, at 4.1σ, 5.0σ, and 3.4σ, respectively. We performed a spectral retrieval modeling on the high-quality optical transmission spectrum newly acquired with the 10.4m Gran Telescopio Canarias (GTC), in combination with the re-analyzed optical transmission spectrum obtained with the 2.5m Nordic Optical Telescope (NOT). By assuming a patchy cloudy model, we retrieved the abundances of Na, K, and Li, which are super-solar at 3.7σ for K and 5.1σ for Li (and only 1.8σ for Na). We constrained the presence of haze coverage to be around 52%. We also found a hint of water absorption, but cannot constrain it with the global retrieval owing to larger uncertainties in the probed wavelengths. WASP-127b will be extremely valuable for atmospheric characterization in the era of James Webb Space Telescope.

Abstract Copyright: © ESO 2018

Journal keyword(s): planetary systems - planets and satellites: individual: WASP-127b - planets and satellites: atmospheres - techniques: spectroscopic

VizieR on-line data: <Available at CDS (J/A+A/616/A145): gtc_spec.dat gtc_wlc.dat listlc.dat lc/*>

Simbad objects: 3

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Number of rows : 3

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 TYC 4916-897-1 * 10 42 11.4175833843 -03 50 13.041786020   11.89 11.05     ~ 3 0
2 BD-03 2978 * 10 42 14.0835894932 -03 50 06.259823354   10.809 10.172     G5 11 0
3 BD-03 2978b Pl 10 42 14.0835894932 -03 50 06.259823354           ~ 19 0

    Equat.    Gal    SGal    Ecl

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2020.07.14-18:23:17

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