***Backyard Worlds: Binaries*** is a sibling project of [Backyard Worlds: Planet 9](https://www.zooniverse.org/projects/marckuchner/backyard-worlds-planet-9) and [Backyard Worlds: Cool Neighbors](https://www.zooniverse.org/projects/coolneighbors/backyard-worlds-cool-neighbors). Backyard Worlds: Planet 9 searches for hypothesized planets in the distant reaches of our own solar system, as well as brown dwarfs. Backyard Worlds: Cool Neighbors focuses on searching for brown dwarfs. These projects have [serendipitously discovered many brown dwarfs in binary systems](https://iopscience.iop.org/article/10.3847/1538-3881/ad324e), which is why we now have Backyard Worlds: Binaries, dedicated entirely to making more of these discoveries. Here are some examples of past Backyard Worlds research papers related to cold companions in binary systems:


- [Spectroscopic Characterization of WD J000801.25-350450 and Its Two Comoving Companions, Jałowiczor+, 2026](https://iopscience.iop.org/article/10.3847/1538-3881/ae38d3)
- [Unveiling the infrared excess of SIPS J2045-6332: evidence for a young stellar object with potential low-mass companion, Hyogo+, 2025](https://doi.org/10.1093/mnras/staf360)
- [New Ultracool Companions to Nearby White Dwarfs, Bravo+, 2025](https://iopscience.iop.org/article/10.3847/1538-3881/ad9b9b)
- [89 New Ultracool Dwarf Co-Moving Companions Identified With The Backyard Worlds: Planet 9 Citizen Science Project, Rothermich+, 2024](https://iopscience.iop.org/article/10.3847/1538-3881/ad324e)

For a full list of Backyard Worlds publications, please see https://www.zooniverse.org/about/publications.

Results

Team

Research

Searching for brown dwarfs paired up with other stars