One of the oldest stars in the Milky Way, with unusually hot rocks “Super Earth” planet, A new research report.
This is TOI-561b Exoplanet Researchers say it is 50% larger than the earth and three times larger than the earth. It whips around its parent star in a very close orbit, completing a circle in less than 12 hours.
According to a statement from the University of California, Riverside, TOI-561b is so close that its average surface temperature exceeds 3140 degrees Fahrenheit (1726 degrees Celsius), which is too high to accommodate any form of life we know. .
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The researchers also found that the density of TOI-561b is similar to that of the earth.
Research co-author Stephen Kane, a planetary astronomer at the University of California, Riverside, said: “This is surprising because you want a higher density.” Said in the statement. “This is consistent with the very old idea of the earth.”
Heavy elements such as iron and magnesium are produced through fusion reactions in the hearts of massive stars. Over time, the number of these elements has gradually increased. Galaxy And more and more stars churn out these materials and discharge them into space when they die in supernova explosions.
Lauren Weiss, a postdoctoral researcher at the University of Hawaii, said on Monday (January 11) that TOI-561b’s low density indicates that it has relatively few heavy elements, so it is very old and formed about 10 billion years ago. In a speech at the 237th meeting of the American Astronomical Society (AAS).
Indeed, the planet’s host star TOI-561 is one of the rare stars located in the thick disk of the Milky Way. It is known that these stars have significantly fewer heavy elements than typical stars in the Milky Way.
Weiss said in an interview: “TOI-561b is one of the oldest rocky planets discovered so far.” UC-Riverside statement. “Its existence shows that the universe has been forming rocky planets since it was founded almost 14 billion years ago.”
Weiss and her colleagues discovered and characterized TOI-561b by studying NASA observations Transit planetary observation satellite (TESS) and WM Keck Observatory, Hawaii. (TOI stands for “Object of Interest in TESS”.)
The system is about 280 light-years away from the Earth and has two other known planets besides TOI-561b. But unlike TOI-561b, these other two planets are too large and not dense enough to shake.
“Although it is unlikely that anyone will live on this special planet today, it may be a sign for many people Rock World It has not been discovered around the oldest stars in our galaxy. “Kane said in the statement.
The new discovery is Released on January 11 Published in the Astronomical Journal and presented at the 237th AAS meeting on Monday.
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