2024ApJ...967...95K

Query : 2024ApJ...967...95K

2024ApJ...967...95K - Astrophys. J., 967, 95 (2024/June-1)

Reduced Water Loss due to Photochemistry on Terrestrial Planets in the Runaway Greenhouse Phase around Pre-main-sequence M Dwarfs.

KAWAMURA Y., YOSHIDA T., TERADA N., NAKAMURA Y., KOYAMA S., KARYU H., TERADA K. and SAKAI S.

Abstract (from CDS):

Terrestrial planets currently in the habitable zone around M dwarfs are estimated to have been in runaway greenhouse conditions for up to ∼1 Gyr due to the long-term pre-main-sequence phase of M dwarfs. These planets likely lose a significant portion of water during the pre-main-sequence phase owing to H2O photolysis followed by hydrogen and oxygen loss to space. However, the effects of H2O reproduction reactions and UV shielding by chemical products that reduce photolysis-induced water loss have yet to be estimated. Here, we apply a 1D photochemical model to a H2O-dominated atmosphere of an Earth-like planet around a pre-main-sequence M dwarf to estimate these effects. We find that water loss is suppressed by efficient H2O reproduction reactions and by UV shielding due to O2. The water loss rate decreases by several to several hundred times compared to that in previous studies, with the assumption that the water loss rate is limited by stellar X-ray and extreme-ultraviolet flux or hydrogen diffusion through the atmosphere. Our results imply that terrestrial planets currently in the habitable zone around M dwarfs are more likely to retain surface water than previously estimated.

Abstract Copyright: © 2024. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Exoplanet atmospheric evolution - Exoplanet atmospheres - Exoplanet evolution - Habitable planets - Planetary atmospheres - Planetary science - Astrobiology - Water vapor - Atmospheric evolution - M dwarf stars - Solar-terrestrial interactions

Simbad objects: 1

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Number of rows : 1
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 TRAPPIST-1 LM* 23 06 29.3684948589 -05 02 29.037301866     18.798 16.466 14.024 M7.5e 1306 0

Query : 2024ApJ...967...95K

Basic data :
TRAPPIST-1 -- Low-mass Star
Other object types: otypes_help 		* (2017AJ,AP,...), IR (2MASSI,2MASSW), LM* (2000AJ), PM* (2006AJ), NIR (2MASS), MIR (WISEA)
ICRS coord. (ep=J2000) : 		23 06 29.3684948589 -05 02 29.037301866 (Optical) [ 0.0616 0.0536 90 ] A 2020yCat.1350....0G
FK4 coord. (ep=B1950 eq=1950) : 		23 03 51.0524178632 -05 18 18.821987388 [ 0.0616 0.0536 90 ]
Gal coord. (ep=J2000) : 		069.7127808375832 -56.6446053686932 [ 0.0616 0.0536 90 ]
Proper motions mas/yr : 		930.788 -479.038 [0.087 0.070 90] A 2020yCat.1350....0G
Radial velocity / Redshift / cz : 		V(km/s) -52.003101 [0.134416] / z(spectroscopic) -0.000173 [0.000000] / cz -52.00 [0.13]
   (NIR) A 2020AJ....160..120J
Parallaxes (mas): 		80.2123 [0.0716] A 2020yCat.1350....0G
Spectral type: 		M7.5e D 2000AJ....120.1085G
Fluxes (7) :
V 18.798 [0.082] C 2006AJ....132.1234C
R 16.466 [0.065] C 2006AJ....132.1234C
G 15.622554 [0.003093] C 2020yCat.1350....0G
I 14.024 [0.115] C 2006AJ....132.1234C
J 11.354 [0.022] C 2003yCat.2246....0C
H 10.718 [0.021] C 2003yCat.2246....0C
K 10.296 [0.023] C 2003yCat.2246....0C
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Hierarchy : number of linked objects
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: 8 		Display criteria :

Identifiers (16) :
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2MASS J23062928-0502285 EPIC 246199087 2MASSW J2306292-050227 TRAPPIST-1
AP J23062928-0502285 K2-112 2MUCD 12171 WISEA J230630.02-050234.1
CNS5 5691 Karmn J23064-050 TIC 278892590 Gaia DR3 2635476908753563008
EPIC 200164267 2MASSI J2306292-050227 TOI-6838 Gaia DR2 2635476908753563008

References (1306 between 1850 and 2026) (Total 1306)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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Velocities : 5    Distance : 5    Var : 1    Fe/H : 3    Plx : 5    PM : 10    SpT : 3   

   

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2MASS J23062928-0502285 AP J23062928-0502285 2MASSI J2306292-050227 WISEA J230630.02-050234.1 Gaia DR3 2635476908753563008
Gaia DR2 2635476908753563008

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