Habitable Zones & Global Climate

A Volcanic Hydrogen Habitable Zone

A Volcanic Hydrogen Habitable Zone

The classical habitable zone is the circular region around a star in which liquid water could exist on the surface of a rocky planet. The outer edge of the traditional N2-CO2-H2O habitable zone (HZ) extends out to nearly 1.7 AU in our Solar System, beyond which condensation and scattering by CO2 outstrips its greenhouse capacity.

Proxima Centauri b

Exploring the Climate of Proxima B With The Met Office Unified Model

Exploring the Climate of Proxima B With The Met Office Unified Model

We present results of simulations of the climate of the newly discovered planet Proxima Centauri B, performed using the Met Office Unified Model (UM). We examine the responses of both an `Earth-like' atmosphere and simplified nitrogen and trace carbon dioxide atmosphere to the radiation likely received by Proxima Centauri B.

Titan

Titan's Atmosphere and Climate

Titan's Atmosphere and Climate

Titan is the only moon with a substantial atmosphere, the only other thick N2 atmosphere besides Earth's, the site of extraordinarily complex atmospheric chemistry that far surpasses any other solar system atmosphere, and the only other solar system body with stable liquid currently on its surface.

Oceanic Research

New Questions on How Earth's Atmosphere and Oceans Formed

New Questions on How Earth's Atmosphere and Oceans Formed

A new study led by The Australian National University (ANU) has found seawater cycles throughout the Earth's interior down to 2,900 km (1,800 miles), much deeper than previously thought, reopening questions about how the atmosphere and oceans formed.

Extrasolar Planets

Triaxial Deformation and Asynchronous Rotation of Rocky Planets in the Habitable Zone of Low-Mass Stars

Triaxial Deformation and Asynchronous Rotation of Rocky Planets in the Habitable Zone of Low-Mass Stars

Rocky planets orbiting M-dwarf stars in the habitable zone tend to be driven to synchronous rotation by tidal dissipation, potentially causing difficulties for maintaining a habitable climate on the planet.

Extrasolar Planets

The Equilibrium Temperature of Planets in Elliptical Orbits

The Equilibrium Temperature of Planets in Elliptical Orbits

There exists a positive correlation between orbital eccentricity and the average stellar flux that planets receive from their parent star. Often, though, it is assumed that the average equilibrium temperature would correspondingly increase with eccentricity.

TRAPPIST-1

UV Surface Habitability of the TRAPPIST-1 System

UV Surface Habitability of the TRAPPIST-1 System

With the discovery of rocky planets in the temperate habitable zone (HZ) of the close-by cool star TRAPPIST-1 the question of whether such planets could also harbour life arises.

Extrasolar Planets

Spitzer Telescope Telescope Reveals Largest Batch of Earth-Size, Habitable-Zone Planets Around Single Star

Spitzer Telescope Telescope Reveals Largest Batch of Earth-Size, Habitable-Zone Planets Around Single Star

NASA's Spitzer Space Telescope has revealed the first known system of seven Earth-size planets around a single star. Three of these planets are firmly located in the habitable zone, the area around the parent star where a rocky planet is most likely to have liquid water.

Ceres

Dawn Discovers Evidence for Organic Material on Ceres

Dawn Discovers Evidence for Organic Material on Ceres

NASA's Dawn mission has found evidence for organic material on Ceres, a dwarf planet and the largest body in the main asteroid belt between Mars and Jupiter.

Habitable Zones & Global Climate

A Supernova at 50 pc: Effects on the Earth's Atmosphere and Biota

A Supernova at 50 pc: Effects on the Earth's Atmosphere and Biota

Recent 60Fe results have suggested that the estimated distances of supernovae in the last few million years should be reduced from 100 pc to 50 pc. Two events or series of events are suggested, one about 2.7 million years to 1.7 million years ago, and another may at 6.5 to 8.7 million years ago.

Proxima Centauri b

Is Proxima Centauri b Habitable? - A Study of Atmospheric Loss

Is Proxima Centauri b Habitable? - A Study of Atmospheric Loss

We address the important question of whether the newly discovered exoplanet, Proxima Centauri b (PCb), is capable of retaining an atmosphere over long periods of time. This is done by adapting a sophisticated multi-species MHD model originally developed for Venus and Mars, and computing the ion escape losses from PCb.

More top stories from March.