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Descobre um planeta incomum com uma composição semelhante a algodão doce
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O que é grande, com uma 🔔 composição semelhante a algodão doce e fluffly? Resulta que se trata de um planeta.
Uma coligação internacional de astrônomos recently discovered 🔔 a planet, named WASP-193b, that's about 50% bigger than Jupiter and somehow still the second lightest planet ever found.
But WASP-193b, 🔔 located beyond our solar system about 1,200 light-years from Earth, isn't just a scientific oddity. The exoplanet could also be 🔔 key to future research investigating atypical planetary formation, according to a study describing the find that published Tuesday in the 🔔 journal Nature Astronomy.
Um planeta semelhante a algodão doce
This cotton candy planet isn't alone; there are other similar planets belonging to 🔔 a class scientists facetiously call "puffy Jupiters." The lightest planet ever discovered is the superpuffy Kepler 51d, which is nearly 🔔 the size of Jupiter but a hundred times lighter than the gas giant.
Puffy Jupiters have largely been a mystery for 🔔 15 years, said lead study author Khalid Barkaoui. But WASP-193b, because of its size, is an ideal candidate for further 🔔 analysis by the James Webb Space Telescope and other observatories.
"The planet is so light that it's difficult to think of 🔔 an analogous, solid-state material," said Barkaoui, a postdoctoral researcher of Earth, atmospheric and planetary sciences at the Massachusetts Institute of 🔔 Technology, in a news release. "The reason why it's close to cotton candy is because both are mostly made of 🔔 light gases rather than solids. The planet is basically super fluffy."
WASP-193b, which researchers think is made up of mostly hydrogen 🔔 and helium, was a huge puzzle for researchers to piece together. Because the exoplanet's density is so light for its 🔔 size, calculating its mass became a challenge.
Desafio bwin champions league winner calcular a massa do planeta
Usually, scientists determine mass using a technique called 🔔 radial velocity, in which researchers analyze how a star's spectrum, a graph that indicates the intensity of light emissions in 🔔 wavelengths, shifts as a planet orbits it. The bigger the planet, the more the star's spectrum can shift - but 🔔 this didn't work for WASP-193b, which is so light, it didn't make any pull on the star that the team 🔔 could detect.
Because of how small the mass signal was, it took the team four years to gather data and calculate 🔔 WASP-193b's mass, Barkaoui explained. Because the extremely low numbers they found were so rare, the researchers completed multiple trials of 🔔 data analysis, just to be sure.
"We were initially getting extremely low densities, which were very difficult to believe in the 🔔 beginning," said co-lead author Francisco Pozuelos, a senior researcher at Spain's Institute of Astrophysics of Andalucia, in a news release.
Eventually 🔔 the team discovered the planet's mass is a measly 14% that of Jupiter, despite being so much bigger.
Um planeta com 🔔 uma atmosfera ext ```python endedora
But a bigger size means a bigger "extended atmosphere," said study coauthor Julien de Wit, an associate professor 🔔 of planetary science at MIT. That means WASP-193b provides an especially useful window into these puffy planets' formation.
"The bigger a 🔔 planet's atmosphere, the more light can go through," de Wit told bwin champions league winner . "So it's clear that this planet 🔔 is one of the best targets we have for studying atmospheric effects. It will be a Rosetta Stone to try 🔔 and resolve the mystery of puffy Jupiters."
But it's also not clear how WASP-193b even formed, Barkaoui said. The "classical evolution 🔔 models" of gas giants don't quite explain the phenomenon.
"WASP-193b is an outlier of all planets discovered to date," he said.
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