A Limited Habitable Zone for Complex Life

@article{Schwieterman2019ALH,
  title={A Limited Habitable Zone for Complex Life},
  author={Edward W. Schwieterman and Christopher T. Reinhard and Stephanie L. Olson and Chester E. Harman and Timothy W. Lyons},
  journal={The Astrophysical Journal},
  year={2019}
}
The habitable zone (HZ) is commonly defined as the range of distances from a host star within which liquid water, a key requirement for life, may exist on a planet's surface. Substantially more CO2 than present in Earth's modern atmosphere is required to maintain clement temperatures for most of the HZ, with several bars required at the outer edge. However, most complex aerobic life on Earth is limited by CO2 concentrations of just fractions of a bar. At the same time, most exoplanets in the… 

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