2019ApJ...873...32M


C.D.S. - SIMBAD4 rel 1.7 - 2021.05.17CEST04:00:55

2019ApJ...873...32M - Astrophys. J., 873, 32-32 (2019/March-1)

From cold to hot irradiated gaseous exoplanets: toward an observation-based classification scheme.

MOLAVERDIKHANI K., HENNING T. and MOLLIERE P.

Abstract (from CDS):

A carbon-to-oxygen ratio (C/O) of around unity is believed to act as a natural separator of water- and methane-dominated spectra when characterizing exoplanet atmospheres. In this paper, we quantify the C/O ratios at which this separation occurs by calculating a large self-consistent grid of cloud-free atmospheric models in chemical equilibrium using the latest version of petitCODE. Our study covers a broad range of parameter space: 400 K < Teff < 2600 K, 2.0 < log(g) < 5.0, -1.0 < [Fe/H] < 2.0, 0.25 < C/O < 1.25, and stellar types from M to F. We make the synthetic transmission and emission spectra, as well as the temperature structures, publicly available. We find that the transition C/O ratio depends on many parameters, such as effective temperature, surface gravity, metallicity, and spectral type of the host star, and could have values less than, equal to, or higher than unity. By mapping all of the transition C/O ratios, we propose a "four-class" classification scheme for irradiated planets in this temperature range. We find a parameter space where methane always remains the cause of dominant spectral features. Detection of CH4 in this region, or the lack of it, provides a diagnostic tool to identify the prevalence of cloud formation and nonequilibrium chemistry. As another diagnostic tool, we construct synthetic Spitzer Infrared Array Camera color diagrams showing two distinguishable populations of planets. Since most of the exoplanet atmospheres appear cloudy when studied in transmission, we regard this study as a starting point of how such a C/O-sensitive observation-based classification scheme should be constructed. This preparatory work will have to be refined by future cloudy and nonequilibrium modeling to further investigate the existence and exact location of the classes, as well as the color-diagram analysis.

Abstract Copyright: © 2019. The American Astronomical Society. All rights reserved.

Journal keyword(s): methods: numerical - planets and satellites: atmospheres - planets and satellites: composition

Simbad objects: 23

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Number of rows : 23

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           ~ 250 1
2 HD 15082b Pl 02 26 51.0582746497 +37 33 01.737746137           ~ 222 1
3 WASP-12b Pl 06 30 32.7966788910 +29 40 20.266334158           G0 593 1
4 WASP-19b Pl 09 53 40.0764883458 -45 39 33.055979403           ~ 283 1
5 WASP-43b Pl 10 19 38.0089444408 -09 48 22.603103969           ~ 237 1
6 WASP-31b Pl 11 17 45.3578468391 -19 03 17.216528280           ~ 97 1
7 Ross 905b Pl 11 42 11.0933874353 +26 42 23.658083337           ~ 647 1
8 K2-235b Pl 12 33 32.8440958980 -10 08 46.223886777           ~ 70 0
9 HAT-P-12b Pl 13 57 33.4668502171 +43 29 36.602501754           ~ 137 1
10 HAT-P-26b Pl 14 12 37.5329989220 +04 03 36.117671696           ~ 115 1
11 WASP-39b Pl 14 29 18.4151765921 -03 26 40.203046112           ~ 107 1
12 BD+22 2716b Pl 14 33 06.3573673505 +21 53 40.982782397           ~ 129 1
13 CD-27 10695b Pl 15 59 50.9489706053 -28 03 42.309432433           ~ 207 1
14 BD+28 2507b Pl 16 02 11.8463105423 +28 10 10.419642379           ~ 162 1
15 HD 149026b Pl 16 30 29.6184841164 +38 20 50.310893575           ~ 305 1
16 NAME G 139-21b Pl 17 15 18.9337265994 +04 57 50.064695682           ~ 574 1
17 NAME BD+46 2629Ab Pl 19 07 53.1396671301 +46 52 05.931203366           ~ 122 1
18 CoRoT-2b Pl 19 27 06.4944821296 +01 23 01.357597206           ~ 193 1
19 BD+47 2936b Pl 19 50 50.2474562793 +48 04 51.097364378           ~ 323 1
20 HD 189733b Pl 20 00 43.7130382888 +22 42 39.071811263           ~ 1168 1
21 HD 209458b Pl 22 03 10.7729598762 +18 53 03.548248479           ~ 1568 1
22 NAME BD+37 4734Bb Pl 22 57 46.8443014981 +38 40 30.355384717           ~ 209 1
23 WASP-6b Pl 23 12 37.7368657624 -22 40 26.277489164           ~ 106 1

    Equat.    Gal    SGal    Ecl

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2021.05.17-04:00:55

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