Astronomer using Immersed lattice infrared flash device (IGRINS) Gemini South Telescope devices looked at Wasp-121B, one of the most widely studied Ultra Hot Jupiter.
The artist's illustration indicates Wasp-121B, an alien world that has lost magnesium and iron gas from the atmosphere. Image credit: NASA / ESA / J. OLMSTED, STSCI.
WASP-121B, discovered by astronomers using Wasp-South Survece in 2016, is 1.87 times that of Jupiter, 1.18 times large.
The host star, WASP-121 (TYC 7630-352-1) is an active F6 main sequence star about 1.5 times the size of the sun.
The WASP-121 system is about 881 light-years away to the puppy constellation.
WASP-121B is a so-called “hot jupiter” and takes only 1 for three days to get on WASP-121 on track. As it is very close to the parent's star, as it approaches, the gravity of the star begins to tear.
Astronomers estimate that the temperature of the planet is about 2,500 degrees (Hana 4,600 degrees), which is enough to boil some metals.
The new Iglin observation results have revealed something unexpected about the WASP-121B formation history.
With these observations, Peter Smith and his colleagues at the Arizona State University, for the first time, measured the ratio of passenger rocks and ice using a single instrument.
“Gemini South using IGRINS has actually measured individual chemical existence more accurately than even achieving a space -based telescope,” said Smith.
The spectroscopic data indicates that the WASP-121B has a high ratio of rock and ice, and indicates that excessive rocky materials have been accumulated during the formation.
This suggests a planet formed in the area of the protranetary disk that is too hot for the ice to condense.
“Our measurement means that this typical view must be reconsidered and the planetary formation model needs to be revisited,” Smith said.
Astronomers also discovered a remarkable feature of the WASP-121B atmosphere.
“The climate of this planet is extreme, not the earth's climate,” Smith said.
Since the planet daySide is very hot, elements that are generally considered “metal” evaporate in the atmosphere and can be detected by the spectroscopic method.
The strong wind blows these metals into the permanent night side of the planet. There, it is cool enough to condense and rain. This is an effect observed on Wasp-121B in the form of calcium rain.
“The sensitivity of our device can be used to examine the subtle wind speed by examining various areas, altitude, and long terms using these elements, revealing how dynamic this planet is. You can do it, “said Smith.
Survey results Will be displayed in Astronomy Journal。
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Peter CB Smith et al。 2025. Roasted marshmallow program with Gemini South Igulin. II. WASP-121 B has a ratio of superstar C/O and impact resistance and volatility. AJ 168, 293; DOI: 10.3847/1538-3881/AD8574
Source: www.sci.news
