2020A&A...640L...5Y


C.D.S. - SIMBAD4 rel 1.7 - 2020.12.01CET01:16:55

2020A&A...640L...5Y - Astronomy and Astrophysics, volume 640, L5-5 (2020/8-1)

A temperature inversion with atomic iron in the ultra-hot dayside atmosphere of WASP-189b.

YAN F., PALLE E., REINERS A., MOLAVERDIKHANI K., CASASAYAS-BARRIS N., NORTMANN L., CHEN G., MOLLIERE P. and STANGRET M.

Abstract (from CDS):

Temperature inversion layers are predicted to be present in ultra-hot giant planet atmospheres. Although such inversion layers have recently been observed in several ultra-hot Jupiters, the chemical species responsible for creating the inversion remain unidentified. Here, we present observations of the thermal emission spectrum of an ultra-hot Jupiter, WASP-189b, at high spectral resolution using the HARPS-N spectrograph. Using the cross-correlation technique, we detect a strong FeI signal. The detected FeI spectral lines are found in emission, which is direct evidence of a temperature inversion in the planetary atmosphere. We further performed a retrieval on the observed spectrum using a forward model with an MCMC approach. When assuming a solar metallicity, the best-fit result returns a temperature of 4320–100+120K at the top of the inversion, which is significantly hotter than the planetary equilibrium temperature (2641K). The temperature at the bottom of the inversion is determined as 2200–800+1000K. Such a strong temperature inversion is probably created by the absorption of atomic species like FeI.

Abstract Copyright: © ESO 2020

Journal keyword(s): planets and satellites: atmospheres - techniques: spectroscopic - planets and satellites: individual: WASP-189b

VizieR on-line data: <Available at CDS (J/A+A/640/L5): spectrum.dat snr.dat>

Simbad objects: 6

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Number of rows : 6

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 HD 10069b Pl 01 37 25.0335097438 -45 40 40.376513381           ~ 235 1
2 HD 15082b Pl 02 26 51.0582746497 +37 33 01.737746137           ~ 208 1
3 CD-38 3220b Pl 07 10 24.0606039387 -39 05 50.570553937           ~ 120 0
4 WASP-189b Pl? 15 02 44.8679915475 -03 01 52.986005307           ~ 13 0
5 WASP-103b Pl 16 37 15.5753608801 +07 11 00.119024745           ~ 99 1
6 HD 195689b Pl 20 31 26.3534038246 +39 56 19.765154336           ~ 109 0

    Equat.    Gal    SGal    Ecl

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2020.12.01-01:16:55

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