Climate simulations reveal possible habitability conditions on planet Gliese 514 b

Star system: Gliese 514 | Distance from the Sun: 24.9 light years

The exoplanet Gliese 514 b orbits within the habitable zone of a Red dwarf star located approximately 25 light-years from Earth. Because the planet follows an eccentric path—meaning its orbit is more oval-shaped than circular—it experiences significant seasonal changes in the amount of stellar light it receives. These conditions make it an important target for future direct-imaging missions, prompting an assessment of its potential surface climates.

To understand what the environment on Gliese 514 b might be like, simulations were performed using an energy balance model. This method accounts for factors such as the planet's atmospheric carbon dioxide levels, land distribution, and the tilt of its axis, known as obliquity. The goal was to determine how these variables influence the planet's temperature and the extent of its surface ice.

Most of the simulated models suggest the planet exists in either a global snowball state or remains entirely ice-free. However, about 1.27 percent of the simulations resulted in climates featuring polar ice caps or equatorial ice belts. The analysis suggests that a specific range of carbon dioxide partial pressure, between 7.25 and 9.5 bar, is necessary to maintain conditions potentially suitable for surface habitability.

Key findings
- Gliese 514 b orbits a Red dwarf star and exhibits an eccentric orbit that drives intense seasonal climate fluctuations.
- Simulations indicate the planet most often defaults to either a frozen snowball state or an ice-free state.
- A specific carbon dioxide partial pressure range of 7.25 to 9.5 bar is required for the surface to remain habitable.
- Only 1.27 percent of modeled scenarios produced stable partial ice coverage, such as polar caps or ice belts.

Scientific study

Climates of Gl 514 b (external link)