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Kepler's First Law of Planetary Motion

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Kepler's Third Law of Planetary Motion

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Surface Mapping of Earth-like Exoplanets using Single Point Light Curves
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Published on: May 10, 2020

Habitable zone limits for dry planets.

Yutaka Abe1, Ayako Abe-Ouchi, Norman H Sleep

  • 1Department of Earth and Planetary Science, University of Tokyo, Japan.

Astrobiology
|June 29, 2011
PubMed
Summary
This summary is machine-generated.

Land planets, or desert worlds, possess wider habitable zones than Earth-like aqua planets. These land planets can maintain liquid water in a broader range of conditions, expanding possibilities for extraterrestrial life.

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Area of Science:

  • Planetary Science
  • Climate Modeling
  • Astrobiology

Background:

  • Habitability discussions traditionally focus on Earth-like 'aqua planets' with abundant surface water.
  • Aqua planets face freezing at the outer edge and runaway greenhouse effects at the inner edge of the habitable zone.
  • Limited surface water on 'land planets' presents an alternative model for habitability.

Purpose of the Study:

  • To investigate the habitable zone extent for 'land planets' compared to 'aqua planets'.
  • To determine if land planets offer a wider range of conditions for stable liquid water.
  • To explore the transition of planets from aqua to land states and implications for habitability.

Main Methods:

  • Numerical experiments using a 3D global climate model for Earth-sized planets.
  • Simulations varied net insolation, obliquity, and atmospheric conditions while keeping CO(2), rotation rate, and surface pressure constant.
  • Comparison of temperature and water stability limits between land and aqua planet scenarios.

Main Results:

  • Land planets maintain polar liquid water up to 170% of Earth's insolation, versus 135% for aqua planets.
  • At the outer habitable zone edge, land planets freeze at 77% insolation (low obliquity) compared to 90% for aqua planets.
  • High-obliquity land planets freeze at 58% insolation, while aqua planets freeze at 72%.

Conclusions:

  • Land planets possess significantly wider habitable zones than aqua planets.
  • Planetary transitions, like Earth losing hydrogen to become a land planet, may occur without a sterilizing runaway greenhouse.
  • Venus could have been a habitable land planet approximately 1 billion years ago.