Astronomers report the detection of a brand new brown dwarf as a part of the Ophiuchus Disk Survey Using ALMA (ODISEA) program. The newfound object, designated SSTc2d J163134.1-24006, seems to be experiencing a quasi-spherical mass loss. The invention was detailed in a paper printed September 2 on the arXiv pre-print repository.
Brown dwarfs are intermediate objects between planets and stars, occupying the mass vary between 13 and 80 Jupiter lots (0.012 and 0.076 solar masses). They’ll burn deuterium however are unable to burn common hydrogen, which requires a minimal mass of a minimum of 80 Jupiter lots and a core temperature of about 3 million Okay.
A workforce of astronomers led by Dary Ruiz-Rodriguez of the Nationwide Radio Astronomy Observatory (NRAO) in Charlottesville, Virginia, have investigated SSTc2d J163134.1-24006, initially recognized as a faint stellar object, below the ODISEA venture, which is devoted to check the complete inhabitants of protoplanetary disks within the Ophiuchus Molecular Cloud. They discovered that SSTc2d J163134.1-24006 is almost definitely a brown dwarf with a mass of about 0.05 solar lots, and an elliptical shell of carbon monoxide (CO).
“SSTc2d J163134.1 was noticed as a part of the ‘Ophiuchus Disk Survey Using ALMA’ (ODISEA) program (Challenge ID: 2016.1.00545.S PI: L. Cieza). ALMA Band 6 (1.3 mm) observations had been carried out on April 27 and August 22, 2018, throughout Cycle 5 utilizing the C43-3 configuration (15–500 m baselines),” the researchers wrote within the paper.
Initially, the workforce serendipitously found an increasing shell of carbon monoxide ejected from an object, with a temperature beneath 3,000 Okay, positioned within the route of the Ophiuchus Molecular Cloud. Additional observations revealed that this shell is related to SSTc2d J163134.1.
With a view to clarify the character of SSTc2d J163134.1 and its increasing shell, Ruiz-Rodriguez’s workforce thought of numerous eventualities, together with the inside-out collapse of a dense molecular core within the Ophiuchus cloud, the mass lack of a large star within the distant background, or a shell of gasoline expelled from a younger brown dwarf. In response to the researchers, probably the most believable one is the brown dwarf speculation.
“We conclude that the supply shouldn’t be a giant star within the distant background (>5–10 kpc) and is almost definitely to be a younger brown dwarf within the Ophiuchus cloud, at a distance of simply ∼139 computer,” the astronomers defined.
Provided that emission of carbon monoxide from SSTc2d J163134.1 has an elliptical form, it was famous that this makes it the primary brown dwarf identified to exhibit a quasi-spherical mass loss. The authors of the paper assume {that a} deuterium flash could possibly be liable for this phenomenon, however extra detailed theoretical work is required with a view to confirm this clarification.
Dary A. RuÃz-RodrÃguez et al, Discovery of a brown dwarf with quasi-spherical mass-loss. arXiv:2209.00759v1 [astro-ph.SR], arxiv.org/abs/2209.00759
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