J/MNRAS/498/4680 Stellar and planetary parameters from TEPCAT (Goyal+, 2020)
A library of self-consistent simulated exoplanet atmospheres.
Goyal J.M., Mayne N., Drummond B., Sing D.K., Hebrard E., Lewis N.,
Tremblin P., Phillips M.W., Mikal-Evans T., Wakeford H.R.
<Mon. Not. R. Astron. Soc., 498, 4680-4704 (2020)>
=2020MNRAS.498.4680G 2020MNRAS.498.4680G (SIMBAD/NED BibCode)
ADC_Keywords: Exoplanets ; Effective temperatures ; Abundances, [Fe/H] ;
Stars, masses ; Stars, diameters ; Optical ; Models
Keywords: techniques: spectroscopic - planets and satellites: atmospheres -
planets and satellites: composition -
planets and satellites: gaseous planets
Abstract:
We present a publicly available library of model atmospheres with
radiative-convective equilibrium pressure-temperature (P-T) profiles
fully consistent with equilibrium chemical abundances, and the
corresponding emission and transmission spectrum with R∼5000 at 0.2um
decreasing to R∼35 at 30um, for 89 hot Jupiter exoplanets, for four
recirculation factors, six metallicities, and six C/O ratios. We find
the choice of condensation process (local/rainout) alters the P-T
profile and thereby the spectrum substantially, potentially detectable
by James Webb Space Telescope. We find H- opacity can contribute to
form a strong temperature inversion in ultrahot Jupiters for C/O
ratios ≳1 and can make transmission spectra features flat in the
optical, alongside altering the entire emission spectra. We highlight
how adopting different model choices such as thermal ionization,
opacities, line-wing profiles and the methodology of varying the C/O
ratio, effects the P-T structure, and the spectrum. We show the role
of Fe opacity to form primary/secondary inversion in the atmosphere.
We use WASP-17b and WASP-121b as test cases to demonstrate the effect
of grid parameters across their full range, while highlighting some
important findings, concerning the overall atmospheric structure,
chemical transition regimes, and their observables. Finally, we apply
this library to the current transmission and emission spectra
observations of WASP-121b, which shows H2O and tentative evidence
for VO at the limb, and H2O emission feature indicative of inversion
on the dayside, with very low energy redistribution, thereby
demonstrating the applicability of library for planning and
interpreting observations of transmission and emission spectrum.
Description:
The target planet selection technique for this library of models is
the same as that adopted in Goyal et al. (2018MNRAS.474.5158G 2018MNRAS.474.5158G, Cat.
J/MNRAS/474/5158) with the additional constraint of the planetary
equilibrium temperature. In this library only the planets with
equilibrium temperatures greater than 1200K, as computed in the TEPCAT
data base (Southworth 2011MNRAS.417.2166S 2011MNRAS.417.2166S) are selected.
The input stellar spectra for each model grid are taken from the BT-Settl
(https://phoenix.ens-lyon.fr/Grids/BT-Settl/AGSS2009/SPECTRA/) models
(Allard, Homeier & Freytag 2012RSPTA.370.2765A 2012RSPTA.370.2765A; Rajpurohit et al.
2013A&A...556A..15R 2013A&A...556A..15R, Cat. J/A+A/556/A15). These stellar spectra are
selected according to the closest obtained host star temperature,
gravity and metallicity from the TEPCAT data base (Southworth
2011MNRAS.417.2166S 2011MNRAS.417.2166S). All the parameters required for model
initialization like stellar radius, planetary radius, planetary
equilibrium temperature, surface gravity, and semimajor axis are also
adopted from the TEPCAT data base, shown in the table 3
(http://www.astro.keele.ac.uk/jkt/tepcat/allplanets-ascii.txt).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 203 89 All the stellar and planetary parameters adopted
from TEPCAT (Southworth 2011MNRAS.417.2166S 2011MNRAS.417.2166S)
database, for the model simulations of 89
exoplanets in the grid
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See also:
J/MNRAS/474/5158 : Stars with hot Jupiter exoplanets (Goyal+, 2018)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Name System name
12- 19 F8.2 K Teff Star effective temperature
21- 25 F5.2 [-] [Fe/H] Star Fe/H abundance ratio
27- 30 F4.2 Msun Mstar Star mass
32- 35 F4.2 Rsun Rstar Star radius
37- 40 F4.2 [m/s2] logg Logarithm of the star surface gravity
42- 45 F4.2 AU a Semi-major axis
47- 50 F4.2 Mjup Mp Planet mass
52- 55 F4.2 Rjup Rp Planet radius
57- 61 F5.2 m/s2 gp Planet surface gravity
63- 69 F7.2 K Teqp Planet equilibrium temperature assuming
0 albedo and efficient redistribution
71- 75 F5.2 mag Vmag V-band magnitude of the star
77- 139 A63 --- refdis Discovery paper reference
141- 203 A63 --- refup Most updated reference
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History:
From electronic version of the journal
(End) Ana Fiallos [CDS] 08-Aug-2023