M-dwarf stars tagged posts

The small, cool M dwarf star TRAPPIST-1 and its seven worlds. New research from the University of Washington speculates on possible climates of these worlds and how they may have evolved.
Credit: NASA

Not all stars are like the sun, so not all planetary systems can be studied with the same expectations. New research from a University of Washington-led team of astronomers gives updated climate models for the seven planets around the star TRAPPIST-1. The work also could help astronomers more effectively study planets around stars unlike our sun, and better use the limited, expensive resources of the James Webb Space Telescope, now expected to launch in 2021.

“We are modeling unfamiliar atmospheres, not just assuming that the things we see in the solar system will look the same way around anot...

Researchers have detected an atmosphere around a near-Earth-size planet, GJ 1132b, located 39 light-years away, depicted here in an artist’s impression. Credit: MPIA

The exoplanet GJ 1132b, which orbits the dwarf star GJ 1132, is located about 39 light-years away from Earth. It has a radius about 1.4 times that of Earth and is 1.6 times Earth’s mass, according to the new study. When the planet was first discovered, researchers called it a potential Venus twin because it’s a rocky world with a very high surface temperature — and now, they’ve found that the planet and Venus might have a thick atmosphere in common, too (although it would have a different composition).

While observers have pinpointed atmospheres around much larger, Jupiter-like gas giants orbiting other stars — and a larger ...