Date of the discovery: 4 February 2020

Short Description: WISE2150-7520AB is a pair of brown dwarfs that are widely separated and orbit each other at about 341 astronomical units (sun-earth distance). The system contains a L1-dwarf (about 72 Jupiter masses) and a T8-dwarf (about 34 Jupiter masses). The system has the lowest binding energy for a system at this low total mass and found outside a young star cluster. Usually it is thought that brown dwarfs form in dense star-forming regions and the systems with low binding energy loose their companion at stellar encounters. The higher gravity of the stars snatch the companion or scatter it into space. WISE2150-7520AB might be a system that survived this dangerous time and is now save. WISE2150-7520AB can be easily resolved by ground-based telescopes and astronomers do not need to rely on space telescopes or adaptive optics to observe the pair.

Volunteer(s): Sam Goodman, Dan Caselden, Guillaume Colin

Researchers in the discovery paper: Jacqueline K. Faherty, Marc J. Kuchner, Aaron M. Meisner, Jonathan Gagne’, Adam C. Schneider, Eileen C. Gonzales, Daniella C. Bardalez Gagliuffi, Sarah E. Logsdon, Katelyn Allers, Adam J. Burgasser

arxiv pre-print: https://arxiv.org/abs/1911.04600

SIMBAD: 2MASS J21501592-7520367

Telescopes involved: WISE, Magellan, Spitzer Space Telescope

Part of Figure 7, showing the unusual properties of WISE2150-7520AB
Other pages:

Press-release: https://www.amnh.org/explore/news-blogs/research-posts/rare-brown-dwarf-system-found-by-citizen-scientists

Project websites: backyard worlds: planet 9

Credit for the header image: wiseview

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