J/MNRAS/474/5158 Stars with hot Jupiter exoplanets (Goyal+, 2018)
A library of ATMO forward model transmission spectra for hot Jupiter exoplanets.
Goyal J.M., Mayne N., Sing D.K., Drummond B., Tremblin P., Amundsen D.S.,
Evans T., Carter A.L., Spake J., Baraffe I., Nikolov N., Manners J.,
Chabrier G., Hebrard E.
<Mon. Not. R. Astron. Soc., 474, 5158-5185 (2018)>
=2018MNRAS.474.5158G 2018MNRAS.474.5158G (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Exoplanets ; Stars, masses ;
Stars, diameters ; Effective temperatures
Keywords: techniques: spectroscopic - planets and satellites: atmospheres -
planets and satellites: composition -
planets and satellites: gaseous planets
Abstract:
We present a grid of forward model transmission spectra, adopting an
isothermal temperature-pressure profile, alongside corresponding
equilibrium chemical abundances for 117 observationally significant
hot exoplanets (equilibrium temperatures of 547-2710K). This
model grid has been developed using a 1D
radiative-convective-chemical equilibrium model termed ATMO, with
up-to-date high-temperature opacities. We present an interpretation of
observations of 10 exoplanets, including best-fitting parameters and
χ2 maps. In agreement with previous works, we find a continuum from
clear to hazy/cloudy atmospheres for this sample of hot Jupiters. The
data for all the 10 planets are consistent with subsolar to solar C/O
ratio, 0.005 to 10 times solar metallicity and water rather than
methane-dominated infrared spectra. We then explore the range of
simulated atmospheric spectra for different exoplanets, based on
characteristics such as temperature, metallicity, C/O ratio, haziness
and cloudiness. We find a transition value for the metallicity between
10 and 50 times solar, which leads to substantial changes in the
transmission spectra. We also find a transition value of C/O ratio,
from water to carbon species dominated infrared spectra, as found by
previous works, revealing a temperature dependence of this transition
point ranging from ∼0.56 to ∼1-1.3 for equilibrium temperatures
from ∼900 to ∼2600K. We highlight the potential of the spectral
features of HCN and C2H2 to constrain the metallicities and C/O ratios
of planets, using James Webb Space Telescope (JWST) observations.
Finally, our entire grid (∼460000 simulations) is publicly
available and can be used directly with the JWST simulator PandExo for
planning observations.
Description:
We have created an extensive grid
(https://bd-server.astro.ex.ac.uk/exoplanets) (∼460000 simulations) of
forward model transmission spectra and the corresponding chemical
abundances for 117 observationally significant exoplanets (3920
simulations per planet).
All the stellar and planetary parameters adopted from TEPCAT
(Southworth, 2011MNRAS.417.2166S 2011MNRAS.417.2166S) data base
(http://www.astro.keele.ac.uk/jkt/tepcat), for the model simulations
of 117 exoplanets in the grid are listed here.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tabled1.dat 139 117 All the stellar and planetary parameters adopted
from TEPCAT (Southworth, 2011MNRAS.417.2166S 2011MNRAS.417.2166S)
data base, for the model simulations of 117
exoplanets in the grid
refs.dat 89 123 References
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See also:
http://www.astro.keele.ac.uk/jkt/tepcat : TEPCAT database
Byte-by-byte Description of file: tabled1.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- System System name (1)
12- 15 I4 K Tstar Stellar temperature
17- 21 F5.2 [-] [Fe/H]star Stellar metallicity
23- 26 F4.2 Msun Mstar Stellar mass
28- 31 F4.2 Rsun Rstar Stellar radius
33- 36 F4.2 [cm/s2] loggstar Stellar gravity
38- 41 F4.2 AU a Semimajor axis
43- 46 F4.2 Mjup Mp Planetary mass
48- 51 F4.2 Rjup Rp Planetary radius
53- 57 F5.2 m/s2 gp Planetary surface gravity
59- 62 I4 K Teqp Planetary equilibrium temperature (2)
64- 68 F5.2 mag Vmag V magnitude of the host star
70-103 A34 --- Ref1 Discovery paper reference in refs.dat file
105-139 A35 --- Ref2 Most updated reference in refs.dat file
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Note (1): planet names with 'b' omitted indicating first planet of the stellar
system as in TEPCAT data base (http://www.astro.keele.ac.uk/jkt/tepcat).
Note (2): assuming 0 albedo and efficient redistribution
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 35 A35 --- Ref Reference code
37- 55 A19 --- BibCode BibCode
57- 89 A33 --- Com Comments
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 12-Mar-2021