THREE POSSIBLE ORIGINS FOR THE GAS LAYER ON GJ 1214b

@article{Rogers2010THREEPO,
  title={THREE POSSIBLE ORIGINS FOR THE GAS LAYER ON GJ 1214b},
  author={Leslie A. Rogers and Sara Seager},
  journal={The Astrophysical Journal},
  year={2010},
  volume={716},
  pages={1208 - 1216}
}
We present an analysis of the bulk composition of the MEarth transiting super-Earth exoplanet GJ 1214b using planet interior structure models. We consider three possible origins for the gas layer on GJ 1214b: direct accretion of gas from the protoplanetary nebula, sublimation of ices, and outgassing from rocky material. Armed only with measurements of the planet mass (Mp = 6.55 ± 0.98 M⊕), radius (Rp = 2.678 ± 0.13 R⊕), and stellar irradiation level, our main conclusion is that we cannot infer… 
GJ 1214b and the prospects for liquid water on super Earths
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  • 2010
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  • Geology, Physics
    Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
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References

SHOWING 1-10 OF 47 REFERENCES
A FRAMEWORK FOR QUANTIFYING THE DEGENERACIES OF EXOPLANET INTERIOR COMPOSITIONS
Several transiting super-Earths are expected to be discovered in the coming few years. While tools to model the interior structure of transiting planets exist, inferences about the composition are
Bulk composition of the transiting hot Neptune around GJ 436
The hot Neptune orbiting around GJ 436 is a unique example of an intermediate mass planet. Its close-in orbit suggests that the planet has undergone migration and its study is fundamental to
Ocean Planet or Thick Atmosphere: On the Mass-Radius Relationship for Solid Exoplanets with Massive Atmospheres
The bulk composition of an exoplanet is commonly inferred from its average density. For small planets, however, the average density is not unique within the range of compositions. Variations of a
Detailed Models of Super-Earths: How Well Can We Infer Bulk Properties?
The field of extrasolar planets has rapidly expanded to include the detection of planets with masses smaller than that of Uranus. Many of these are expected to have little or no hydrogen and helium
Composition of Ices in Low-Mass Extrasolar Planets
We study the formation conditions of icy planetesimals in protoplanetary disks in order to determine the composition of ices in small and cold extrasolar planets. Assuming that ices are formed from
Structure and evolution of super-Earth to super-Jupiter exoplanets - I. Heavy element enrichment in the interior
Aims. We examine the uncertainties in current planetary models and quantify their impact on the planet cooling histories and massradius relationships. Methods. These uncertainties include (i) the
A super-Earth transiting a nearby low-mass star
TLDR
Observations of the transiting planet GJ’1214b are reported, finding that the planetary mass and radius are consistent with a composition of primarily water enshrouded by a hydrogen–helium envelope that is only 0.05% of the mass of the planet.
Mass-Radius Relationships for Solid Exoplanets
We use new interior models of cold planets to investigate the mass-radius relationships of solid exoplanets, considering planets made primarily of iron, silicates, water, and carbon compounds. We
Ranges of Atmospheric Mass and Composition of Super-Earth Exoplanets
Terrestrial-like exoplanets may obtain atmospheres from three primary sources: capture of nebular gases, degassing during accretion, and degassing from subsequent tectonic activity. Here we model
Atmospheres of Protoplanetary Cores: Critical Mass for Nucleated Instability
We systematically study quasi-static atmospheres of accreting protoplanetary cores for different opacity behaviors and realistic planetesimal accretion rates in various parts of the protoplanetary
...
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