2019A&A...626A.133H


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.10CEST02:37:54

2019A&A...626A.133H - Astronomy and Astrophysics, volume 626A, 133-133 (2019/6-1)

Sparkling nights and very hot days on WASP-18b: the formation of clouds and the emergence of an ionosphere.

HELLING C., GOURBIN P., WOITKE P. and PARMENTIER V.

Abstract (from CDS):


Context. WASP-18b is an ultra-hot Jupiter with a temperature difference of up to 2500 K between day and night. Such giant planets begin to emerge as a planetary laboratory for understanding cloud formation and gas chemistry in well-tested parameter regimes in order to better understand planetary mass loss and for linking observed element ratios to planet formation and evolution.
Aims. We aim to understand where clouds form, their interaction with the gas-phase chemistry through depletion and enrichment, the ionisation of the atmospheric gas, and the possible emergence of an ionosphere on ultra-hot Jupiters.
Methods. We used 1D profiles from a 3D atmosphere simulation for WASP-18b as input for kinetic cloud formation and gas-phase chemical equilibrium calculations. We solved our kinetic cloud formation model for these 1D profiles, which sample the atmosphere of WASP-18b at 16 different locations along the equator and in the mid-latitudes. We derived the gas-phase composition consistently.
Results. The dayside of WASP-18b emerges as completely cloud-free as a result of the very high atmospheric temperatures. In contrast, the nightside is covered in geometrically extended and chemically heterogeneous clouds with dispersed particle size distributions. The atmospheric C/O ratio increases to >0.7 and the enrichment of the atmospheric gas with cloud particles is ρdgas>10–3. The clouds that form at the limbs appear located farther inside the atmosphere, and they are the least extended. Not all day- to nightside terminator regions form clouds. The gas phase is dominated by H2, CO, SiO, H2O, H2S, CH4, and SiS. In addition, the dayside has a substantial degree of ionisation that is due to ions such as Na+, K+, Ca+, and Fe+. Al+ and Ti+ are the most abundant of their element classes. We find that WASP-18b, as one example for ultra-hot Jupiters, develops an ionosphere on the dayside.

Abstract Copyright: © ESO 2019

Journal keyword(s): astrochemistry - planets and satellites: atmospheres - solid state: refractory - planets and satellites: gaseous planets - infrared: planetary systems

Simbad objects: 12

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Number of rows : 12

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 HD 10069 * 01 37 25.0335097438 -45 40 40.376513381   9.74 9.30     F6IV/V 153 1
2 HD 10069b Pl 01 37 25.0335097438 -45 40 40.376513381           ~ 211 1
3 NAME BPS CS 29504-0036B BD* 01 39 42.9 -34 42 37           L8 17 1
4 HD 15082b Pl 02 26 51.0582746497 +37 33 01.737746137           ~ 182 1
5 WASP-12b Pl 06 30 32.7966788910 +29 40 20.266334158           G0 534 1
6 CD-38 3220b Pl 07 10 24.0606039387 -39 05 50.570553937           ~ 89 0
7 WASP-103b Pl 16 37 15.5753608801 +07 11 00.119024745           ~ 81 1
8 NAME BD+46 2629Ab Pl 19 07 53.1396671301 +46 52 05.931203366           ~ 107 1
9 Kepler-16b Pl 19 16 18.1759181246 +51 45 26.777781114           ~ 109 1
10 HD 189733b Pl 20 00 43.7130382888 +22 42 39.071811263           ~ 1082 1
11 HD 195689b Pl 20 31 26.3534038246 +39 56 19.765154336           ~ 80 0
12 HD 209458b Pl 22 03 10.7729598762 +18 53 03.548248479           ~ 1468 1

    Equat.    Gal    SGal    Ecl

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2020.07.10-02:37:54

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