Discovery of a Volcanic Planet Surrounded by an Atmosphere That Reflects Light Like a Giant Sunshade

Discovery of a Volcanic Planet Surrounded by an Atmosphere That Reflects Light Like a Giant Sunshade

In an exciting scientific step, the James Webb Space Telescope has revealed an extremely hot rocky planet surrounded by an unexpected atmosphere that resembles a giant “sunshade” reflecting most of the light from the planet’s star. These findings are prompting a rethink of the ability of hot planets to retain their atmospheres despite harsh conditions.

Observation and analysis of the planet TOI-561 b

An international team of astronomers, led by Dr. Anjali Piette from the University of Birmingham, conducted a study using the James Webb Space Telescope (James Webb Space Telescope – JWST) of the rocky planet TOI-561 b, which is about 280 light-years from Earth. The observation lasted more than 37 hours, during which nearly four full orbits of the planet around its star were tracked.

The expectations were that such an extremely hot planet would have no atmosphere, as intense radiation would cause any gases around it to evaporate. But the results revealed the possibility of a dense atmosphere that can reflect most of the stellar radiation, providing the planet with a kind of protection and linking the atmosphere to the molten surface.

🌋 A refreshing atmosphere in a harsh environment

• The atmosphere contains reflective clouds of silicate minerals, such as silicon dioxide (SiO2) and magnesium silicate (MgSiO3).
• These clouds act as a natural shield that reflects about 75% of the star’s light, limiting the rise in surface temperature.
• The atmosphere helps transfer heat from the planet’s sun-facing side to the dark side, balancing temperatures across the planet.

This relationship between the atmosphere and the molten surface may point to a unique phenomenon, in which the molten volcanic ocean continuously supplies the atmosphere with gases, explaining how this planet has retained its atmosphere despite exposure to intense stellar radiation over billions of years.

Challenging previous concepts about hot planets

Scientific theories have long held that rocky planets very close to their stars, like TOI-561 b, cannot retain their atmospheres because intense radiation leads to the loss of gases. However, this new discovery is prompting a reconsideration of that rule.

There is a possibility that the planet is supplied continuously with gases through global volcanic activity, somewhat similar to Jupiter’s volcanic moon Io, which emits sulfur dioxide.

🌑 What does the darkness of the dark side mean?

Since TOI-561 b is tidally locked and the same side remains facing the star, observations focused on the temperature of the dark side, which does not receive direct sunlight. The results showed that the temperature of this dark side is lower than expected, confirming that heat is transferred around the planet and that most of the radiation is reflected before reaching the surface. This is further evidence of an effective atmosphere.

Possible forms of the atmosphere

• An atmosphere rich in carbon dioxide, similar to Venus’s atmosphere but in hotter conditions.
• Or an atmosphere rich in sulfur dioxide, resulting from strong volcanic activity similar to the case of Io.

This difference in chemical composition will determine the nature of the atmosphere and the planet’s behavior more precisely, and research teams using the James Webb Telescope are trying to reach answers through observations of the planet at longer wavelengths.

Future challenges in understanding the planet TOI-561 b

The most important question remains: does this planet resemble the hot planet Venus, or is it an extreme version of the fiery moon Io?

Future studies using the James Webb Space Telescope at different wavelengths will help identify more precisely the atmosphere’s components and its physical and chemical conditions, which is essential for understanding how this planet’s atmosphere withstands immense radiation storms.

Conclusion

James Webb has revealed an extremely hot volcanic planet that shows an atmosphere reflecting a large proportion of its star’s light, making it an exceptional case among close-to-star planets and giving us new insights into the nature of hot planets and the ways they preserve their atmospheres.

Source: NASA website

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