2013ApJ...775...10V


Query : 2013ApJ...775...10V

2013ApJ...775...10V - Astrophys. J., 775, 10 (2013/September-3)

Bulk composition of GJ 1214b and other sub-Neptune exoplanets.

VALENCIA D., GUILLOT T., PARMENTIER V. and FREEDMAN R.S.

Abstract (from CDS):

GJ 1214b stands out among the detected low-mass exoplanets, because it is, so far, the only one amenable to transmission spectroscopy. Up to date there is no consensus about the composition of its envelope although most studies suggest a high molecular weight atmosphere. In particular, it is unclear if hydrogen and helium are present or if the atmosphere is water dominated. Here, we present results on the composition of the envelope obtained by using an internal structure and evolutionary model to fit the mass and radius data. By examining all possible mixtures of water and H/He, with the corresponding opacities, we find that the bulk amount of H/He of GJ 1214b is at most 7% by mass. In general, we find the radius of warm sub-Neptunes to be most sensitive to the amount of H/He. We note that all (Kepler-11b,c,d,f, Kepler-18b, Kepler-20b, 55Cnc-e, Kepler-36c, and Kepler-68b) but two (Kepler-11e and Kepler-30b) of the discovered low-mass planets so far have less than 10% H/He. In fact, Kepler-11e and Kepler-30b have 10%-18% and 5%-15% bulk H/He. Conversely, little can be determined about the H2 O or rocky content of sub-Neptune planets. We find that although a 100% water composition fits the data for GJ 1214b, based on formation constraints the presence of heavier refractory material on this planet is expected, and hence, so is a component lighter than water required. The same is true for Kepler-11f. A robust determination by transmission spectroscopy of the composition of the upper atmosphere of GJ 1214b will help determine the extent of compositional segregation between the atmosphere and the envelope.

Abstract Copyright:

Journal keyword(s): opacity - planets and satellites: composition - planets and satellites: individual (GJ 1214b, Kepler-11e) - planets and satellites: interiors

Simbad objects: 18

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Number of rows : 18
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 CoRoT-7b Pl 06 43 49.4690410679 -01 03 46.825797768           ~ 372 1
2 NAME LP 424-4b Pl 07 59 05.8395618539 +15 23 29.240025256           ~ 211 1
3 * rho01 Cnc e Pl 08 52 35.8113282132 +28 19 50.956901366           ~ 465 1
4 NAME G 139-21b Pl 17 15 18.9337265994 +04 57 50.064695682           ~ 596 1
5 G 139-21 PM* 17 15 18.9339850845 +04 57 50.066612336       14.394   M4.5V 272 1
6 Kepler-30b Pl 19 01 08.0746750853 +38 56 50.218666290           ~ 64 1
7 Kepler-10b Pl 19 02 43.0613892904 +50 14 28.701617339           ~ 264 1
8 Kepler-20b Pl 19 10 47.5234815840 +42 20 19.299357667           ~ 94 1
9 BD+48 2893b Pl 19 24 07.7660110490 +49 02 24.928201112           ~ 79 1
10 Kepler-36c Pl 19 25 00.0430855076 +49 13 54.631289830           ~ 105 1
11 Kepler-36b Pl 19 25 00.0430855076 +49 13 54.631289830           ~ 130 1
12 Kepler-11b Pl 19 48 27.6228219845 +41 54 32.902654079           ~ 135 1
13 Kepler-11f Pl 19 48 27.6228219845 +41 54 32.902654079           ~ 119 1
14 Kepler-11d Pl 19 48 27.6228219845 +41 54 32.902654079           ~ 106 1
15 Kepler-11e Pl 19 48 27.6228219845 +41 54 32.902654079           ~ 110 1
16 Kepler-11c Pl 19 48 27.6228219845 +41 54 32.902654079           ~ 99 1
17 Kepler-11 Ro* 19 48 27.6228219845 +41 54 32.902654079       14.00   G2V 315 1
18 Kepler-18b Pl 19 52 19.0688249829 +44 44 46.807526602           ~ 67 1

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2021.11.28-23:02:09

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