CoRoT-2b: Exoplanet Where a Day Lasts Longer Than a Year
Astronomers studying the gas giant CoRoT-2b have come across something unusual. It does not fit the usual models of close-in exoplanets. The planet is about 695 light-years from Earth. It has been observed for years. But only recently did scientists understand its real motion.
The research team used data from the European Southern Observatory’s Very Large Telescope. They also worked with scientists connected to NASA’s exoplanet program at Caltech.
The results show that this planet does not behave like a typical tidally locked world. This is surprising for a hot Jupiter.
Most hot Jupiters orbit very close to their stars. They usually become tidally locked. One side always faces the star. The other side stays in darkness. This idea has been accepted for a long time.
CoRoT-2 b does not follow this rule. The planet rotates in about three Earth days. But it orbits its star in only 1.5 days. This means it circles its star twice during one full planetary day. This result goes against standard models of planetary physics.
Earlier observations already showed something strange. In 2018, scientists found that the hottest point in the atmosphere was not where it should be. It was shifted in the opposite direction. This was unexpected. It did not match predictions based on wind movement.
To explain this, scientists suggested several ideas. One idea was thick cloud layers. Another was strong magnetic effects. A third idea was slow rotation. New data supports the third explanation. Rotation seems to be the key factor.
This discovery is important for other planets too. Many planets orbit red dwarf stars. These stars are small and very common.
Their habitable zones are very close to the star. Because of this, planets there may lock their rotation quickly. Understanding this process is important for habitability studies.
CoRoT-2 b shows that rotation systems can behave in unexpected ways. It suggests that tidal locking is not always simple. More discoveries like this may change how scientists understand exoplanets in the future.
Source: NASA Exoplanet Archive – CoRoT-2b.
NASA specialists previously announced a space rescue mission to retrieve the Swift telescope, which could fall to Earth. A 1974 Stargazer aircraft will be used for this mission.
