Researchers using NASA's TESS satellite have discovered two rocky exoplanets in a system in our cosmic backyard, located just 33 light-years from Earth.
Researchers using NASA’s Transiting Exoplanet Survey Satellite have discovered two rocky exoplanets in a system in our cosmic backyard, located just 33 light-years from Earth. These are some of the closest rocky planets discovered to date, orbiting around a small, cool star called HD 260655.
Estimating the surface temperature of exoplanets is tricky though because it depends on whether the planets have an atmosphere. In our solar system, for example, Venus is hotter on its surface than Mercury even though it is farther from the sun because its thick atmosphere traps the heat. And these two planets are ideal candidates for studying exoplanet atmospheres, because they are relatively close to us and because the star around which they orbit is bright despite its small size.
James Webb will be able to investigate exoplanet atmospheres by looking at the light which shines from a star and passes through a planet’s atmosphere. By splitting this light into a spectrum, researchers can see which wavelengths have been absorbed by particular molecules, and that allows them to work out what the atmosphere is composed of.
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