J/MNRAS/519/6210 Classification of Rocky Exoplanet Sample (McIntyre+, 2023)
A rocky exoplanet classification method and its application to
calculating surface pressure and surface temperature.
McIntyre S.R.N., King P.L., Mills F.P.
<Mon. Not. R. Astron. Soc. 519, 6210-6221 (2023)>
=2023MNRAS.519.6210M 2023MNRAS.519.6210M (SIMBAD/NED BibCode)
ADC_Keywords: Models ; Exoplanets
Keywords: catalogues - planets and satellites: surfaces -
planets and satellites: terrestrial planets
Abstract:
With over 5000 exoplanets currently detected, there is a need for a
primary classification method to prioritise candidates for
biosignature observations. Here, we develop a classification method to
categorise rocky exoplanets based on their closest solar system
analogue using available data of observed stellar and planetary
features, masses, and radii, to model non-thermal atmospheric escape,
thermal atmospheric escape, and stellar irradiation boundaries.
Applying this classification method to the 720 rocky exoplanets in our
sample with uncertainties in planetary masses, radii, stellar
temperatures, and fluxes propagated via a Monte Carlo model indicates
that 22%±8% are Mercury analogues, 39%±4% are Mars analogues,
11%±1% are Venus analogues, 2%±1% are Earth analogues, and
26%±12% are without a known planetary counterpart in our solar
system. Extrapolating to conditions on LHS 3844b and GJ 1252b, our
classification method gives results reasonably consistent with the
observations by Kreidberg et al. (2019Natur.573...87K 2019Natur.573...87K) and Crossfield
et al. (2022ApJ...937L..17C 2022ApJ...937L..17C), respectively. Subsequently, to
demonstrate the functionality of this classification method, we plot
our catalogued sample of exoplanets on an adjusted surface pressure
versus temperature phase diagram, presenting more realistic estimates
of the potential surface phases (gas, liquid or ice). Our new
classification method could help target selection for future exoplanet
characterisation missions.
Description:
Catalogue of 720 rocky exoplanets (Rp≤1.23R⊕) compiled from
NASA's composite planet database (Akeson et al.,
2013PASP..125..989A 2013PASP..125..989A), in combination with additional information on
the Kepler planets' radii provided by Berger et al.,
(2020AJ....160..108B 2020AJ....160..108B, Cat. J/AJ/160/108) and updated stellar
properties by Berger et al. (2020AJ....159..280B 2020AJ....159..280B, Cat. J/AJ/159/280)
to compose a catalogue of rocky exoplanets. Unknown masses or radii
and their associated uncertainties are estimated using Chen & Kipping
(2017ApJ...834...17C 2017ApJ...834...17C, Cat. J/ApJ/834/17) M-R relationship for
terrestrial planets: Rp∼Mp(0.279±0.009).
For each exoplanet in our sample, we execute 10000 Monte Carlo
simulations using a Gaussian probability distribution for
uncertainties on the stellar temperatures, insolation fluxes,
planetary masses, and planetary radii. The Monte Carlo simulations
allow us to determine the median and 68% confidence intervals on
escape velocity, equilibrium temperature, surface temperature, and
surface pressure.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 157 720 Classification of 720 rocky exoplanets
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See also:
J/AJ/160/108 : Gaia-Kepler stellar properties cat. II. Planets (Berger+, 2020)
J/AJ/159/280 : Gaia-Kepler stellar properties cat. I. KIC stars (Berger+, 2020)
J/ApJ/834/17 : Mass + radius of planets, moons, low mass stars (Chen+, 2017)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 18 A18 --- Planet Planet name
20- 23 F4.2 Mgeo Mp Planetary mass
25- 29 F5.2 Mgeo e_Mp Planetary mass error
31- 34 F4.2 Rgeo Rp Planetary radius
36- 39 F4.2 Rgeo e_Rp Planetary radius error
41- 48 F8.2 m/s vesc Escape velocity
50- 57 F8.2 m/s e_vesc Escape velocity error
59- 65 F7.2 K Teq Equilibrium temperature
67- 72 F6.2 K e_Teq Equilibrium temperature error
74- 81 F8.2 1361W/m2 S* Insolation flux (in solar flux unit)
83- 89 F7.2 1361W/m2 e_S* Insolation flux error (in solar flux unit)
91- 94 F4.2 bar OgPsurf Original surface pressure
96- 99 F4.2 bar e_OgPsurf Original surface pressure error
101-108 E8.2 bar AdPsurf ? Adjusted surface pressure
110-117 E8.2 bar e_AdPsurf ? Adjusted surface pressure error
119-125 F7.2 K AdTsurf ? Adjusted surface temperature
127-132 F6.2 K e_AdTsurf ? Adjusted surface temperature error
134-157 A24 --- PlClass Planet classification
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Acknowledgements:
Sarah R.N. McIntyre, sarah.mcintyre(at)anu.edu.au
(End) Sarah RN McIntyre [ANU], Patricia Vannier [CDS] 09-Jan-2023