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Washington, Nov 22 at least one of the seven & # 39; rocky planets orbiting the star of dwarf Trappist 1 can & # 39; have world ocean like Earth, scientists say they have created up climate models for exoplanets.
Researchers from the University & # 39; Washington in the United States said that because of the very strong and powerful stellar early stage, the seven worlds of the star may have evolved as Venus.
Any early oceans that planets have been evaporated, leaving a dense atmospheres and uninhabitable.
"We are immudellaw unfamiliar atmospheres, not just assume that the things we see in the solar system will look alike around other stars," said Andrew Lincowski, student & # 39; doctorate at the University & # 39; Washington.
"We have done this research to showcase & # 39; able to see these different kinds & # 39; atmospheres," said Lincowski, main author of the study published in the Astrophysical Journal.
Trappist 1, located 39 light years & # 39; away, has about nine & # 39; percent the mass of the Sun and about 12 percent its radius.
The relatively cool star & # 39; "Nana M" – the most common type in the universe – only slightly larger radius of the planet Jupiter, but is much greater in mass.
All seven of the planets & # 39; Trappist 1 are on Earth-sized and three – planets with e tag, f and g – are thought to be in its habitable zone, that area & # 39; rock star around which the planet can & # 39; have liquid water on its surface, and b & # 39; it gives them a chance to life.
Trappist 1 rides the edge of & # 39; inside of the habitable zone, while more & # 39; forward, Trappist 1 hour, little bit orbit & # 39; outside edge & # 39; out.
"This is a whole sequence of & # 39; planets can & # 39; take a look at the evolution of the planets, b & # 39; in particular around stars is very different from ours, b & # 39; different light emitted by ", said Lincowski.
The radiation patterns and team chemistry to create spectral signatures or & # 39; length & # 39; waves, any possible atmospheric gas, allowing observers to predict better where to look for such gases in & # 39; exoplanet atmospheres.
The researchers said that when the trace gas actually found by the Webb telescope, or anyone else, some day, "astronomers will use the bumps observed and wiggles in the spectra to infer what gases are present – and compare that work like ours to say something about the composition of the planet, the environment and perhaps its evolutionary history. "
He said that people are used to thinking about habitabilità of & # 39; planet around stars like the sun.
"But M dwarf stars are very different, so you really want to think about chemical effects on atmospheric chemistry and how that affects the climate", said Lincowski.
Trappist 1 b, the closer to the star, is a world warmer too hot even for partners & # 39; sulfuric acid, such as & # 39; on Venus, to form.
The planets c and receive a little more energy from their star than Venus and the Earth do sun and can be similar to Venus, b & # 39; dense atmosphere unviable.
Trappist 1 e is the most likely of the seven & # 39; to host liquid water on a moderate face, and is an excellent choice for further study with & # 39; & # 39 divjenza in, mind.
The planets & # 39; outside f, g and h can be similar to Venus or can be frozen, depending on the formed water on the planet during its evolution.
Lincowski said that in reality, any or all plant & # 39; Trappist 1 can & # 39; is similar to Venus, b & # 39; a water ocean or burned long & # 39; away.
He explained that when water evaporates from the surface of the planet, the ultraviolet light from the star breaks down water molecules and releasing hydrogen, which is the lighter element and can & # 39; escape the gravity of & # 39; planet.
It can & # 39; left much oxygen, that can & # 39; remains & # 39; in the atmosphere and irreversibly remove water from the planet. Such a planet can & # 39; & # 39 has atmosphere; thick oxygen – but not one generated by life, and different from anything that has been observed.
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