Utilizing the James Webb House Telescope (JWST), astronomers have noticed a close-by chilly brown dwarf designated WISEPA J182831.08+265037.8 (or WISE 1828 for brief). The observations delivered necessary insights into the composition of the item’s environment. The brand new findings had been published Feb. 8 on the preprint server arXiv.
Brown dwarfs are intermediate substellar objects between planets and stars with lots under the hydrogen burning restrict—about 80 Jupiter lots. One subclass of brown dwarfs (with efficient temperatures decrease than 500 Okay) is called Y dwarfs, and represents the good and least luminous substellar objects to date detected.
Situated simply 32.37 light years away from the Earth, WISE 1828 is an archetypal type-Y brown dwarf. Earlier observations have recommended that it has a radius much like that of Jupiter’s, whereas its mass is estimated to be about 10 Jupiter lots. The efficient temperature of this brown dwarf was discovered to be 378 Okay.
Lately, a workforce of astronomers led by Ben Wei Peng Lew of the Bay Space Environmental Analysis Institute in Moffett Area, California, has carried out an in-depth atmospheric research of WISE 1828. For this function, they employed JWST’s Close to-Infrared Spectrograph (NIRSpec).
“On this research, we leverage reasonable spectral decision observations (R ∼ 2700) with the G395H grating of the Close to-Infrared Spectrograph (NIRSpec) onboard of JWST to characterize the close by (9.9 laptop) Y dwarf WISEPA J182831.08+265037.8,” the researchers wrote.
The observations detected water, carbon monoxide, carbon dioxide, methane, ammonia and hydrogen sulfide within the environment of WISE 1828. The authors of the paper famous that their research marks the primary measurement of the hydrogen sulfide abundance in an environment of a Y-dwarf.
The research discovered that WISE 1828 has above-solar abundance ratios of oxygen to hydrogen, sulfur to hydrogen. The abundance ratio of nitrogen relative to hydrogen was estimated to be possible near-solar. The outcomes additionally recommend a lower-than-nominal abundance of methane-d1.
By utilizing two complementary atmospheric modeling instruments, the researchers managed to measure the metallicity and carbon to oxygen abundance ratio of WISE 1828’s environment. One mannequin signifies that the metallicity is at a degree of 0.3 dex, whereas the opposite one factors to a metallicity of -0.57 dex. The carbon to oxygen abundance ratios are related, in response to these two fashions, about 0.46 and 0.43 dex, respectively.
The fashions allowed the workforce to additionally calculate the radius and effective temperature of WISE 1828. One mannequin suggests 1.23 Jupiter radii and 534 Okay, whereas in response to the opposite one, the planet is smaller and colder—1.03 Jupiter radii and 425 Okay.
Extra info:
Ben W. P. Lew et al, Excessive-precision atmospheric characterization of a Y dwarf with JWST NIRSpec G395H spectroscopy: isotopologue, C/O ratio, metallicity, and the abundances of six molecular species, arXiv (2024). DOI: 10.48550/arxiv.2402.05900
Journal info:
arXiv
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Astronomers examine the environment of a close-by chilly brown dwarf (2024, February 15)
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