WISE 0825+2805


WISE 0825+2805 is a planetary mass brown dwarf or rogue planet with a spectral type of Y0.5. It is about 21.4 light-years away from Earth in the Cancer constellation. It is a potential member of the Corona of Ursa Major moving group, a collection of young stars that are million years old. If WISE 0825+2805 has the same age as the CUMA moving group, then its spectral energy distribution suggests it has a mass of Jupiter masses, a radius of Jupiter radii, and an effective temperature of.

Discovery

WISE 0825+2805 was discovered in 2015 by Schneider et al. with the Wide-field Infrared Survey Explorer and the Hubble Space Telescope, using WFC3 near-infrared grism spectroscopy. The team also announced the discovery of three T-dwarfs as well as two additional Y-dwarfs in the same paper.

Physical properties

WISE 0825+2805 has been observed with the James Webb Space Telescope's NIRCam and MIRI instruments. A best-fit model of WISE 0825+2805's spectral energy distribution indicates that its atmosphere is phosphine-free and diabatic. A good-fitting SED model requires an effective temperature of 350 Kelvin and a surface gravity of log g 4.0. Alternatively, a lower surface gravity could improve the SED fit. The model parameters correspond to a mass of and an age of 800 Myrs. On the other hand, if WISE 0825+2805 is the same age as the Corona of Ursa Major moving group, then the best-fit SED indicates a mass of, a radius of, and an effective temperature of.