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Title: Comparative Climates of the Trappist-1 Planetary System: Results from a Simple Climate-vegetation Model

Abstract

The recent discovery of the planetary system hosted by the ultracool dwarf star TRAPPIST-1 could open new paths for investigations of the planetary climates of Earth-sized exoplanets, their atmospheres, and their possible habitability. In this paper, we use a simple climate-vegetation energy-balance model to study the climate of the seven TRAPPIST-1 planets and the climate dependence on various factors: the global albedo, the fraction of vegetation that could cover their surfaces, and the different greenhouse conditions. The model allows us to investigate whether liquid water could be maintained on the planetary surfaces (i.e., by defining a “surface water zone (SWZ)”) in different planetary conditions, with or without the presence of a greenhouse effect. It is shown that planet TRAPPIST-1d seems to be the most stable from an Earth-like perspective, since it resides in the SWZ for a wide range of reasonable values of the model parameters. Moreover, according to the model, outer planets (f, g, and h) cannot host liquid water on their surfaces, even with Earth-like conditions, entering a snowball state. Although very simple, the model allows us to extract the main features of the TRAPPIST-1 planetary climates.

Authors:
; ;  [1];  [2]
  1. Dipartimento di Fisica, Università della Calabria, Ponte P. Bucci, Cubo 31C, I-87036, Rende (CS) (Italy)
  2. LESIA—Observatoire de Paris, PSL Research University, 5 place Jules Janssen, F-92190, Meudon (France)
Publication Date:
OSTI Identifier:
22663380
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 844; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; CLIMATES; COMPUTERIZED SIMULATION; DWARF STARS; ENERGY BALANCE; GREENHOUSE EFFECT; LIQUIDS; PLANETS; PLANTS; RADIANT HEAT TRANSFER; SATELLITES; SURFACES; WATER

Citation Formats

Alberti, Tommaso, Carbone, Vincenzo, Lepreti, Fabio, and Vecchio, Antonio. Comparative Climates of the Trappist-1 Planetary System: Results from a Simple Climate-vegetation Model. United States: N. p., 2017. Web. doi:10.3847/1538-4357/AA78A2.
Alberti, Tommaso, Carbone, Vincenzo, Lepreti, Fabio, & Vecchio, Antonio. Comparative Climates of the Trappist-1 Planetary System: Results from a Simple Climate-vegetation Model. United States. doi:10.3847/1538-4357/AA78A2.
Alberti, Tommaso, Carbone, Vincenzo, Lepreti, Fabio, and Vecchio, Antonio. Thu . "Comparative Climates of the Trappist-1 Planetary System: Results from a Simple Climate-vegetation Model". United States. doi:10.3847/1538-4357/AA78A2.
@article{osti_22663380,
title = {Comparative Climates of the Trappist-1 Planetary System: Results from a Simple Climate-vegetation Model},
author = {Alberti, Tommaso and Carbone, Vincenzo and Lepreti, Fabio and Vecchio, Antonio},
abstractNote = {The recent discovery of the planetary system hosted by the ultracool dwarf star TRAPPIST-1 could open new paths for investigations of the planetary climates of Earth-sized exoplanets, their atmospheres, and their possible habitability. In this paper, we use a simple climate-vegetation energy-balance model to study the climate of the seven TRAPPIST-1 planets and the climate dependence on various factors: the global albedo, the fraction of vegetation that could cover their surfaces, and the different greenhouse conditions. The model allows us to investigate whether liquid water could be maintained on the planetary surfaces (i.e., by defining a “surface water zone (SWZ)”) in different planetary conditions, with or without the presence of a greenhouse effect. It is shown that planet TRAPPIST-1d seems to be the most stable from an Earth-like perspective, since it resides in the SWZ for a wide range of reasonable values of the model parameters. Moreover, according to the model, outer planets (f, g, and h) cannot host liquid water on their surfaces, even with Earth-like conditions, entering a snowball state. Although very simple, the model allows us to extract the main features of the TRAPPIST-1 planetary climates.},
doi = {10.3847/1538-4357/AA78A2},
journal = {Astrophysical Journal},
issn = {0004-637X},
number = 1,
volume = 844,
place = {United States},
year = {2017},
month = {7}
}