astronomers have discovered a new exoplanet, the helium atmosphere is inflated like a balloon, and into All evaporated. The observation could provide new insights into the extreme atmospheric conditions of hot exoplanets, researchers hope.
As exoplanets, astronomers planet call outside of our own solar system. The Planet with the catalog number hat-P-11b draws about 124 light-years from earth, its orbit in the constellation of the Swan. He is about as large as Neptune in our System. Moreover, it orbits its star very closely: 20 Times denser than the earth, the sun.
“We had suspected that this proximity to the star could affect the atmosphere of exoplanets,” said Romain Allart of the University of Geneva. “The new measurements show precisely that the Exo-planets atmosphere is undoubtedly inflated by the radiation of the star and to the All escapes.”
helium cloud is 2.5 Times the size of the Planet
the Planet per second loses up to 300 kilograms of Helium, reports Allart and colleagues in the journal “Science”. “Helium is blown from the Dayside of the planet, with more than 10,000 kilometers per hour on the night side,” explained Allarts colleague at the Institute, Vincent Bourrier. “Because it is such a light Gas, it escapes it quickly, the attraction of the planet and forms a broad cloud around him.”
This cloud has at least 2.5 times the diameter of the planet and its balloon shape, as model calculations show.
Helium had been detected this year for the first Time in exoplanet atmospheres, reported Co-author Jessica Spake of the University of Exeter in the UK. “We hope to understand with this new investigation, what types of planets have large envelopes of hydrogen and Helium and how long the gases in your atmosphere are able to keep.”
Hard to find in alien planets
Helium atmospheres undetectable is one of the most common chemical elements in the universe and an essential component of the atmospheres of large gaseous planets. Astronomers can detect it, however, from earth, in the planetary atmospheres.
they used a special spectrograph at the Calar Alto Observatory in Spain. It can detect wavelengths in the visible and near-infrared range in high-resolution and provides better results than the Hubble space telescope.
a group of Lisa Nortmann from the Astrophysical Institute of the Canary Islands, Tenerife has used the spectrograph and in the case of an Exo-planet the size of Saturn is also a loss of Helium from the atmosphere detected. She presents her observations in a “Science”.
Together with observations of other exoplanets, the measurements confirmed the expectation that Exo-planets lose their atmospheres faster, the stronger they become heated by its star, conclude the researchers.