2017MNRAS.471.4355P


C.D.S. - SIMBAD4 rel 1.7 - 2021.05.15CEST22:02:59

2017MNRAS.471.4355P - Mon. Not. R. Astron. Soc., 471, 4355-4373 (2017/November-2)

On signatures of clouds in exoplanetary transit spectra.

PINHAS A. and MADHUSUDHAN N.

Abstract (from CDS):

Transmission spectra of exoplanetary atmospheres have been used to infer the presence of clouds/hazes. Such inferences are typically based on spectral slopes in the optical deviant from gaseous Rayleigh scattering or low-amplitude spectral features in the infrared. We investigate three observable metrics that could allow constraints on cloud properties from transmission spectra, namely the optical slope, the uniformity of this slope and condensate features in the infrared. We derive these metrics using model transmission spectra considering Mie extinction from a wide range of condensate species, particle sizes and scaleheights. First, we investigate possible degeneracies among the cloud properties for an observed slope. We find, for example, that spectra with very steep optical slopes suggest sulphide clouds (e.g. MnS, ZnS, Na2S) in the atmospheres. Secondly, (non)uniformities in optical slopes provide additional constraints on cloud properties, e.g. MnS, ZnS, TiO2 and Fe2O3 have significantly non-uniform slopes. Thirdly, infrared spectra provide an additional powerful probe into cloud properties, with SiO2, Fe2O3, Mg2SiO4 and MgSiO3 bearing strong infrared features observable with James Webb Space Telescope. We investigate observed spectra of eight hot Jupiters and discuss their implications. In particular, no single or composite condensate species considered here conforms to the steep and non-uniform optical slope observed for HD 189733b. Our work highlights the importance of the three above metrics to investigate cloud properties in exoplanetary atmospheres using high-precision transmission spectra and detailed cloud models. We make our Mie scattering data for condensates publicly available to the community.

Abstract Copyright: © 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): radiative transfer - scattering - planets and satellites: atmospheres - planets and satellites: composition - planetary systems - planetary systems

CDS comments: HD 95678b is a misprint for HD 97658b.

Simbad objects: 14

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Number of rows : 14

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 WASP-12b Pl 06 30 32.7966788910 +29 40 20.266334158           G0 593 1
2 NAME LP 424-4b Pl 07 59 05.8395618539 +15 23 29.240025256           ~ 190 1
3 WASP-19b Pl 09 53 40.0764883458 -45 39 33.055979403           ~ 283 1
4 HD 97658b Pl 11 14 33.1613362847 +25 42 37.391912066           ~ 145 1
5 WASP-31b Pl 11 17 45.3578468391 -19 03 17.216528280           ~ 97 1
6 Ross 905b Pl 11 42 11.0933874353 +26 42 23.658083337           ~ 647 1
7 HAT-P-12b Pl 13 57 33.4668502171 +43 29 36.602501754           ~ 137 1
8 WASP-39b Pl 14 29 18.4151765921 -03 26 40.203046112           ~ 107 1
9 CD-27 10695b Pl 15 59 50.9489706053 -28 03 42.309432433           ~ 207 1
10 NAME G 139-21b Pl 17 15 18.9337265994 +04 57 50.064695682           ~ 574 1
11 HD 189733b Pl 20 00 43.7130382888 +22 42 39.071811263           ~ 1168 1
12 HD 209458b Pl 22 03 10.7729598762 +18 53 03.548248479           ~ 1568 1
13 NAME BD+37 4734Bb Pl 22 57 46.8443014981 +38 40 30.355384717           ~ 209 1
14 WASP-6b Pl 23 12 37.7368657624 -22 40 26.277489164           ~ 106 1

    Equat.    Gal    SGal    Ecl

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2021.05.15-22:02:59

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