Scientists spot a planet that shouldn바카라 게임 웹사이트t exist
A Jupiter-like planet located 520 light-years from Earth may be an unlikely survivor after its host star had a temper tantrum.
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The gas planet is known as 8 UMi b and was named after its initial discovery by Korean astronomers in 2015. Halla, regarded as a sacred place, is the highest mountain in South Korea.
The exoplanet orbits a giant star larger than our sun named Baekdu, located in the Ursa Minor, or 바카라 게임 웹사이트Little Bear,바카라 게임 웹사이트 constellation.
Halla orbits Baekdu at a distance about half that between the Earth and the sun at 0.46 astronomical units, or 42,759,659 miles (68,815,020 kilometers). Halla is considered a 바카라 게임 웹사이트hot Jupiter,바카라 게임 웹사이트 a classification for exoplanets similar in size to Jupiter that have higher temperatures given how closely they orbit their host stars.
Astronomers believe that Halla somehow survived after its star experienced a violent transition that should have destroyed nearby planets. A study detailing the findings was published Wednesday in the journal .
Observations of Baekdu were made using NASA바카라 게임 웹사이트s Transiting Exoplanet Survey Satellite, which studies nearby stars. The team바카라 게임 웹사이트s observations revealed that the star is burning through the supply of helium at its core, since it already appears to have exhausted its hydrogen. The revelation suggests to astronomers that the star once expanded into a red giant star.
바카라 게임 웹사이트Engulfment by a star normally has catastrophic consequences for close orbiting planets. When we realized that Halla had managed to survive in the immediate vicinity of its giant star, it was a complete surprise,바카라 게임 웹사이트 said study co-author Dr. Dan Huber, Australian Research Council Future Fellow at the University of Sydney and associate professor at the Institute for Astronomy of the University of Hawaii at Manoa, in a statement.
바카라 게임 웹사이트As it exhausted its core hydrogen fuel, the star would have inflated up to 1.5 times the planet바카라 게임 웹사이트s current orbital distance 바카라 게임 웹사이트 engulfing it completely in the process 바카라 게임 웹사이트 before shrinking to its current size.바카라 게임 웹사이트
Planetary survival scenarios
Our sun is expected to reach the end of its lifespan in 5 billion years, when it will expand to 100 times its current size and likely engulf and obliterate Earth and other planets in the solar system.
While our solar system only has one star, many stars across the universe exist in binary pairs. Astronomers are still investigating how planets form around these double-star systems 바카라 게임 웹사이트 and the fate of those planets, as well.
When the research team realized the star was likely once larger than the current orbit of the planet, they carried out follow-up observations in 2021 and 2022 using the W. M. Keck Observatory and the Canada-France-Hawaii Telescope atop Mauna Kea in Hawaii.
The additional observations revealed that the planet바카라 게임 웹사이트s nearly circular orbit, which takes 93 Earth days to complete, had remained stable for more than a decade.
바카라 게임 웹사이트Together, these observations confirmed the existence of Halla, leaving us with the compelling question of how the planet survived,바카라 게임 웹사이트 said lead study author Dr. Marc Hon, astronomer and postdoctoral researcher at the University of Hawaii, in a statement. 바카라 게임 웹사이트The observations from multiple telescopes on Maunakea were critical in this process.바카라 게임 웹사이트
Now, astronomers are trying to determine if it바카라 게임 웹사이트s possible that the planet could withstand such a cataclysmic stellar event.
Scientists believe that gas giants like hot Jupiter exoplanets begin by orbiting at a greater distance from their host stars before eventually migrating closer. But that may not be the case for Halla, which orbits a rapidly evolving star.
바카라 게임 웹사이트We just don바카라 게임 웹사이트t think Halla could have survived being absorbed by an expanding red giant star,바카라 게임 웹사이트 Huber said.
It바카라 게임 웹사이트s entirely possible that Halla never faced any danger to begin with, according to the researchers.
바카라 게임 웹사이트The system was more likely similar to the famous fictional planet Tatooine from Star Wars, which orbits two suns,바카라 게임 웹사이트 said study coauthor Tim Bedding, an astronomer and professor at the University of Sydney, in a statement. 바카라 게임 웹사이트If the Baekdu system originally consisted of two stars, their merger could have prevented any one of them from expanding sufficiently to engulf the planet.바카라 게임 웹사이트
In such a scenario, the stars would have fed off each other, according to the researchers.
Another possibility is that Halla is a fairly young planet born from a gas cloud that was created by a catastrophic collision between the two stars, making it a second-generation planet created in the system.
