Corot Strikes Again
Newly Discovered Planet Holds Water
© ESA, AOES Medialab
More than 400 exoplanets have been discovered so far and 70 of them have been found by the ‘transit’ method. A transit is a kind of eclipse and occurs when a celestial body passes in front of its host star and blocks some but not all of the star’s light. This temporarily dims the apparent brightness of the star and enables the planet’s mass, diameter, density and temperature to be deduced. The time between similar transits gives the orbital period of the planet.
Corot-9b is the first transiting planet to have both a longer period and a near-circular orbit. Its orbit is slightly elliptical but at closest approach to its parent star it reaches a distance of 33 million miles. Although that is only about the distance of Mercury in our Solar System, it is by far the largest orbit of any transiting planet found so far. Because it orbits a star cooler than our Sun, calculations estimate that Corot-9b’s temperature could lie somewhere between –9° F and 314°C.
Corot-9b has a radius around 1.05 times that of Jupiter but only 84% of the mass. This leads to a density of 0.90 g/cc, or 68% that of Jupiter. “Corot-9b is the first exoplanet that is definitely similar to a planet in our Solar System,” says Hans Deeg, a researcher at the Instituto de Astrofísica de Canarias, whose paper on the discovery is published in Nature.
The similarity is caused by the fact that Corot-9b is sufficiently far from its star to prevent tidal forces from heating its interior. Tidal forces are created by the strength of gravity weakening from the front to back of the celestial body. When the difference between the near side and the far side is great, the tidal force can prevent the planet from spinning quickly, forcing it to only show one face to the star. It can also provide heat to the interior of the planet, changing its physical condition.
Based on calculations, neither of these is possible in this case. “Although we don’t know, because we can’t see the planet directly, there is reason to believe that this planet has a normal day-night cycle,” says Malcolm Fridlund, ESA Project Scientist for Corot. It means that lacking a tidal heat source, Corot-9b’s interior is likely to have remained similar to the gas giants in our Solar System.
There is also one other tantalizing possibility about this world. Although the planet itself is a gas giant and hence has no solid surface to stand on, what if it possessed a moon like Saturn’s Titan? If the temperature were towards the lower end of the estimated range, then any moon would be an ice ball. If it were towards the upper end, it would be rather too hot for liquid water. But what if it were somewhere in the middle?