Assessing the Habitability of the TRAPPIST-1 System Using a 3D Climate Model

@article{Wolf2017AssessingTH,
  title={Assessing the Habitability of the TRAPPIST-1 System Using a 3D Climate Model},
  author={Eric T. Wolf},
  journal={arXiv: Earth and Planetary Astrophysics},
  year={2017}
}
  • E. Wolf
  • Published 16 March 2017
  • Geology, Physics
  • arXiv: Earth and Planetary Astrophysics
The TRAPPIST-1 system provides an extraordinary opportunity to study multiple terrestrial extrasolar planets and their atmospheres. Here we use the National Center for Atmospheric Research Community Atmosphere Model version 4 to study the possible climate and habitability of the planets in the TRAPPIST-1 system. We assume ocean-covered worlds, with atmospheres comprised of N2, CO2, and H2O, and with orbital and geophysical properties defined from observation. Model results indicate that the… 

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References

SHOWING 1-10 OF 36 REFERENCES
3D climate modeling of close-in land planets: Circulation patterns, climate moist bistability and habitability
The inner edge of the classical habitable zone is often defined by the critical flux needed to trigger the runaway greenhouse instability. This 1D notion of a critical flux, however, may not be so
Habitable zone limits for dry planets.
TLDR
It is shown that "land planets" (desert worlds with limited surface water) have wider habitable zones than aqua planets, and it is possible that Venus was a habitable land planet as recently as 1 billion years ago.
Constraints on Climate and Habitability for Earth-like Exoplanets Determined from a General Circulation Model
Conventional definitions of habitability require abundant liquid surface water to exist continuously over geologic timescales. Water in each of its thermodynamic phases interacts with solar and
The habitability of Proxima Centauri b II. Possible climates and Observability
Radial velocity monitoring has found the signature of a $M \sin i = 1.3$~M$_\oplus$ planet located within the Habitable Zone (HZ) of Proxima Centauri \citep{Anglada16}. Despite a hotter past and an
Water loss from terrestrial planets orbiting ultracool dwarfs: implications for the planets of TRAPPIST-1
Ultracool dwarfs (UCD) encompass the population of extremely low mass stars (later than M6-type) and brown dwarfs. Because UCDs cool monotonically, their habitable zone (HZ) sweeps inward in time.
Habitable zones around main sequence stars.
TLDR
The results suggest that mid-to-early K stars should be considered along with G stars as optimal candidates in the search for extraterrestrial life.
EFFECTS OF OBLIQUITY ON THE HABITABILITY OF EXOPLANETS AROUND M DWARFS
Most previous studies on how obliquity affects planetary habitability focused on planets around Sun-like stars. Their conclusions may not be applicable to habitable planets around M dwarfs due to the
Controls on the Archean climate system investigated with a global climate model.
TLDR
A three-dimensional climate model is used to examine changes to Earth's rotation rate, surface albedo, cloud properties, and total atmospheric pressure following proposals from the recent literature on changes to the Archean climate system.
Extreme water loss and abiotic O2 buildup on planets throughout the habitable zones of M dwarfs.
TLDR
In general, it is found that the initial phase of high luminosity may compromise the habitability of many terrestrial planets orbiting low-mass stars.
Seven temperate terrestrial planets around the nearby ultracool dwarf star TRAPPIST-1
TLDR
The observations reveal that at least seven planets with sizes and masses similar to those of Earth revolve around TRAPPIST-1, and the six inner planets form a near-resonant chain, such that their orbital periods are near-ratios of small integers.
...
...