MarketWISEA J120037.79−784508.3
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WISEA J120037.79−784508.3

WISEA J120037.79−784508.3, also called W1200−7845 or 2MASS J12003792−7845082, is a brown dwarf with a primordial disk 333.73 ± 3.13 lightyears from Earth in the 3.7+4.6−1.4 Myr-old ε Chamaeleontis association, currently making it the closest known brown dwarf with an associated circumstellar disk. It was discovered by citizen scientists in 2020 volunteering for the Disk Detective project.

Brown dwarf
The brown dwarf has a mass of about 42–58 and has a spectral type of about M6.0γ. The gamma (γ) signifies the low surface gravity of the object, which is typical for young brown dwarfs. No accretion was detected from paschen and brackett spectral lines. == Disk ==
Disk
Three possible scenarios were considered for the disk: i) A blackbody disk (a disk with uniform temperature), ii) two blackbody disks (a disk with a gap) and iii) a power-law disk. The blackbody disk model has a temperature of 516 K (243°C; 469°F). The two-blackbodies model compromises of an inner disk with a temperature of 730 K (457°C; 854°F) and an outer disk with a temperature of 230 K (–43°C; –46°F). The best-fit model is a power-law disk with a power-law slope of α = –0.94, which is consistent with a class II disk. The close proximity of this system to the Solar System makes this disk a good candidate to image the disk with ALMA. == See also ==
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