Star blasts planet with X-rays
Although the star CoRoT-2a may be frying exoplanet CoRoT-2b, the planet may also be affecting the behavior of the star that’s blasting it.
September 14, 2011
A nearby star is pummeling a companion planet with a barrage of X-rays a hundred thousand times more intense than Earth receives from the Sun.
This graphic contains an image and illustration of a nearby star named CoRoT-2a, which has a planet in close orbit around it. The separation between the star and planet is only about 3 percent of the distance between Earth and the Sun, causing some exotic effects not seen in our solar system. Credit: X-ray: NASA/CXC/Univ of Hamburg/S.Schröter et al; Optical: NASA/NSF/IPAC-Caltech/UMass/2MASS, UNC/CTIO/PROMPT; Illustration: NASA/CXC/M.Weiss
New data from NASA’s Chandra X-ray Observatory and the European Southern Observatory’s (ESO) Very Large Telescope (VLT) suggest that high-energy radiation is evaporating about 5 million tons of matter from the planet every second. This result gives insight into the difficult survival path for some planets. The planet, known as CoRoT-2b, has a mass about 3 times that of Jupiter (1,000 times that of Earth) and orbits its parent star, CoRoT-2a at a distance roughly 10 times the distance between Earth and the Moon.
The CoRoT-2 star and planet — named after the French Space Agency’s Convection, Rotation and planetary Transits (CoRoT) satellite that discovered them in 2008 — is a relatively nearby neighbor of the solar system at a distance of 880 light-years.
“This planet is being absolutely fried by its star,” said Sebastian Schroeter from the University of Hamburg in Germany. “What may be even stranger is that this planet may be affecting the behavior of the star that is blasting it.”
According to optical and X-ray data, the CoRoT-2 system is estimated to be between about 100 million and 300 million years old, meaning that the star is fully formed. The Chandra observations show that CoRoT-2a is an active star, with bright X-ray emission produced by powerful, turbulent magnetic fields. Such strong activity is usually found in much younger stars.
“Because this planet is so close to the star, it may be speeding up the star’s rotation, and that could be keeping its magnetic fields active,” said Stefan Czesla from the University of Hamburg. “If it wasn’t for the planet, this star might have left behind the volatility of its youth millions of years ago.”
Support for this idea came from observations of a likely companion star that orbits CoRoT-2a at a distance about 1,000 times greater than the separation between Earth and our Sun. This star is not detected in X-rays, perhaps because it does not have a close-in planet like CoRoT-2b to cause it to stay active. Another intriguing aspect of CoRoT-2b is that it appears to be unusually inflated for a planet in its position.
“We’re not exactly sure of all the effects this type of heavy X-ray storm would have on a planet, but it could be responsible for the bloating we see in CoRoT-2b,” said Schroeter. “We are just beginning to learn about what happens to exoplanets in these extreme environments.”