Super-Hot Planet Atmosphere: Scientists Reveal New Findings
- Astronomers have, for the first time, detected a clear atmospheric signature around a rocky exoplanet - a planet outside our solar system.
- TOI-561 b is roughly twice the size of Earth,but its environment is drastically different.It orbits incredibly close to its star - just one-tenth the distance between Mercury and...
- The prevailing theory suggested that small, hot planets like TOI-561 b lack the gravity and cooling rates necesary to hold onto an atmosphere over extended periods. These planets...
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James Webb Telescope Detects Atmosphere on Rocky Exoplanet TOI-561 b
What Happened?
Astronomers have, for the first time, detected a clear atmospheric signature around a rocky exoplanet – a planet outside our solar system. The discovery, made using the James Webb Space Telescope (JWST), centers on TOI-561 b, a scorching hot planet orbiting a star 10.56 hours. This finding challenges previous assumptions about the atmospheric evolution of small, hot planets.
TOI-561 b is roughly twice the size of Earth,but its environment is drastically different.It orbits incredibly close to its star – just one-tenth the distance between Mercury and the Sun – resulting in a perpetually daylit side. scientists initially predicted that a planet of this size and temperature would quickly shed any atmosphere it might possess.
Challenging Existing Theories
The prevailing theory suggested that small, hot planets like TOI-561 b lack the gravity and cooling rates necesary to hold onto an atmosphere over extended periods. These planets were thought to lose their gaseous envelopes soon after formation due to intense stellar radiation and heat.However, the JWST observations indicate otherwise.
“Based on what we know about other systems, such a planet was thought to be too small and too hot to retain its atmosphere for a long time after its formation,” explained Nicole Wallack, a co-author of the study from the Carnegie Institution for Science. “but these observations turn the prevailing concepts on their head.”
The detection wasn’t a direct visual observation of the atmosphere, but rather an analysis of the light filtering through it as the planet transited (passed in front of) its star. Specific wavelengths of light were absorbed, revealing the presence of atmospheric gases. The exact composition of the atmosphere is still under investigation.
TOI-561 b: A Closer Look
TOI-561 b is part of a multi-planet system. It orbits a star slightly smaller and cooler than our Sun, located approximately 280 light-years away in the constellation Cygnus. The system also includes TOI-561 c, a larger, cooler planet with a longer orbital period.
| Planet | Size (Relative to Earth) | orbital Period | Distance from Star (Relative to Mercury-Sun) |
|---|---|---|---|
| TOI-561 b | ~2x Earth | 10.56 hours | ~0.1 |
| TOI-561 c | ~3.8x Earth |
|