2018ApJ...853...64D


Query : 2018ApJ...853...64D

2018ApJ...853...64D - Astrophys. J., 853, 64-64 (2018/January-3)

Secondary atmospheres on HD 219134 b and c.

DORN C. and HENG K.

Abstract (from CDS):

We analyze the interiors of HD 219134 b and c, which are among the coolest super-Earths detected thus far. Without using spectroscopic measurements, we aim at constraining if the possible atmospheres are hydrogen-rich or hydrogen-poor. In the first step, we employ a full probabilistic Bayesian inference analysis to rigorously quantify the degeneracy of interior parameters given the data of mass, radius, refractory element abundances, semimajor axes, and stellar irradiation. We obtain constraints on structure and composition for core, mantle, ice layer, and atmosphere. In the second step, we aim to draw conclusions on the nature of possible atmospheres by considering atmospheric escape. Specifically, we compare the actual possible atmospheres to a threshold thickness above which a primordial (H2-dominated) atmosphere can be retained against evaporation over the planet's lifetime. The best-constrained parameters are the individual layer thicknesses. The maximum radius fraction of possible atmospheres are 0.18 and 0.13 R (radius), for planets b and c, respectively. These values are significantly smaller than the threshold thicknesses of primordial atmospheres: 0.28 and 0.19 R, respectively. Thus, the possible atmospheres of planets b and c are unlikely to be H2-dominated. However, whether possible volatile layers are made of gas or liquid/solid water cannot be uniquely determined. Our main conclusions are (1) the possible atmospheres for planets b and c are enriched and thus possibly secondary in nature, and (2) both planets may contain a gas layer, whereas the layer of HD 219134 b must be larger. HD 219134 c can be rocky.

Abstract Copyright: © 2018. The American Astronomical Society. All rights reserved.

Journal keyword(s): planets and satellites: atmospheres - planets and satellites: composition - planets and satellites: individual HD 219134 b, HD 219134 c - planets and satellites: interiors - planets and satellites: terrestrial planets - planets and satellites: terrestrial planets

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 - 2022
#notes
1 CoRoT-7b Pl 06 43 49.4690410679 -01 03 46.825797768           ~ 373 1
2 * rho01 Cnc PM* 08 52 35.8113282132 +28 19 50.956901366 7.45 6.82   5.4   K0IV-V 1025 1
3 * rho01 Cnc e Pl 08 52 35.8113282132 +28 19 50.956901366           ~ 468 1
4 NAME L 320-124b Pl 10 14 51.7783473599 -47 09 24.189733387           ~ 113 0
5 HD 97658b Pl 11 14 33.1613362847 +25 42 37.391912066           ~ 160 1
6 NAME G 139-21b Pl 17 15 18.9337265994 +04 57 50.064695682           ~ 602 1
7 Kepler-102e Pl 18 45 55.8561241973 +47 12 28.843506748           ~ 53 0
8 Kepler-10b Pl 19 02 43.0613892904 +50 14 28.701617339           ~ 265 1
9 HD 179070b Pl 19 09 26.8351401260 +38 42 50.455094310           ~ 54 1
10 Kepler-454b Pl 19 09 54.8466398069 +38 13 43.921816174           ~ 41 0
11 Kepler-20b Pl 19 10 47.5234815840 +42 20 19.299357667           ~ 95 1
12 Kepler-33c Pl 19 16 18.6100034488 +46 00 18.813469620           ~ 26 1
13 Kepler-19b Pl 19 21 40.9995767736 +37 51 06.436261131           ~ 46 1
14 BD+48 2893b Pl 19 24 07.7660110490 +49 02 24.928201112           ~ 80 1
15 Kepler-36c Pl 19 25 00.0430855076 +49 13 54.631289830           ~ 106 1
16 Kepler-36b Pl 19 25 00.0430855076 +49 13 54.631289830           ~ 131 1
17 BD+38 3583b Pl 19 25 40.3886092719 +38 40 20.411344230           ~ 86 0
18 Kepler-78b Pl 19 34 58.0139307295 +44 26 53.957326851           ~ 120 1
19 Kepler-11d Pl 19 48 27.6228219845 +41 54 32.902654079           ~ 107 1
20 Kepler-79e Pl 20 02 04.1057596467 +44 22 53.646600034           ~ 41 1
21 HD 219134c Pl 23 13 16.9747821012 +57 10 06.076520993           ~ 33 0
22 HD 219134b Pl 23 13 16.9747821012 +57 10 06.076520993           ~ 77 0
23 HD 219134 Er* 23 13 16.9747821012 +57 10 06.076520993 7.460 6.560 5.570 4.76 4.23 K3V 550 1

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2021.12.09-15:00:44

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