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Astronomers uncover new brown dwarf with quasi-spherical mass loss

Herschel column-density map of the Ophiuchus molecular cloud. The magenta star signifies the situation of SSTc2d J163134.1. The Lynds L1709 darkish cloud within the area is indicated. Credit: Ruiz-Rodriguez et al., 2022.

Astronomers report the detection of a brand new brown dwarf as a part of the Ophiuchus Disk Survey Employing ALMA (ODISEA) program. The newfound object, designated SSTc2d J163134.1-24006, seems to be experiencing a quasi-spherical mass loss. The discovery 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 can burn deuterium however are unable to burn common hydrogen, which requires a minimal mass of no less than 80 Jupiter lots and a core temperature of about 3 million Ok.

A staff of astronomers led by Dary Ruiz-Rodriguez of the National Radio Astronomy Observatory (NRAO) in Charlottesville, Virginia, have investigated SSTc2d J163134.1-24006, initially recognized as a faint stellar object, below the ODISEA challenge, which is devoted to check the whole inhabitants of protoplanetary disks within the Ophiuchus Molecular Cloud. They discovered that SSTc2d J163134.1-24006 is more than likely a brown dwarf with a mass of about 0.05 solar lots, and an elliptical shell of carbon monoxide (CO).

“SSTc2d J163134.1 was observed as part of the ‘Ophiuchus Disk Survey Employing ALMA’ (ODISEA) program (Project ID: 2016.1.00545.S PI: L. Cieza). ALMA Band 6 (1.3 mm) observations were performed on April 27 and August 22, 2018, during Cycle 5 using the C43-3 configuration (15–500 m baselines),” the researchers wrote within the paper.

First of all, the staff serendipitously found an increasing shell of carbon monoxide ejected from an object, with a temperature beneath 3,000 Ok, positioned within the course of the Ophiuchus Molecular Cloud. Further observations revealed that this shell is related to SSTc2d J163134.1.

In order to clarify the character of SSTc2d J163134.1 and its increasing shell, Ruiz-Rodriguez’s staff thought-about varied 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. According to the researchers, probably the most believable one is the brown dwarf speculation.

“We conclude that the source is not a giant star in the distant background (>5–10 kpc) and is most likely to be a young brown dwarf in the Ophiuchus cloud, at a distance of just ∼139 pc,” the astronomers defined.

Given that emission of carbon monoxide from SSTc2d J163134.1 has an elliptical form, it was famous that this makes it the primary brown dwarf recognized to exhibit a quasi-spherical mass loss. The authors of the paper assume {that a} deuterium flash might be answerable for this phenomenon, however extra detailed theoretical work is required with the intention to confirm this rationalization.

New faint, distant and cold brown dwarf discovered

More info:
Dary A. Ruíz-Rodríguez 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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Astronomers uncover new brown dwarf with quasi-spherical mass loss (2022, September 12)
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