WD 0032−317

WD 0032−317 is a low mass white dwarf star orbited by brown dwarf WD 0032−317 b.

WD 0032−317

Observation data Epoch       Equinox
Constellation	Sagittarius
Right ascension	00h 34m 49.8573s
Declination	−31° 29′ 52.686″
Characteristics
Evolutionary stage	White dwarf
Astrometry
Parallax (π)	2.320±0.053 mas
Distance	431.1±9.8 pc
Orbit
Primary	WD 0032−317
Details
WD 0032−317
Mass	0.4187±0.0047 (He-core) 0.386±0.014 (Hybrid-core) M☉
Radius	0.0266±0.0012 R☉
Temperature	36965±100 K
WD 0032−317 b
Mass	0.0812±0.0029 (He-core) 0.0750±0.0037 (Hybrid-core) M☉
Radius	0.0789+0.0085 −0.0083 (He-core) 0.0747+0.0085 −0.0079 (Hybrid-core) R☉
Temperature	5126±28 (He-core) 5111±41 (Hybrid-core) (equilibrium temperature) K
Other designations
WD 0032−317, MCT 0032-3146, EC 00323-3146, GALEX J003449.8-312952, 2MASS J00344984-3129524, TIC 251857373, USNO-B1.0 0585-00006922, Gaia DR3 2317319612801004416, Gaia DR2 2317319612801004416
Database references
SIMBAD	data

WD 0032−317

The white dwarf WD 0032−317 is located about 1,400 light years from Earth.^[1] WD 0032−317 formed about three billion years ago when a low mass star (possibly of 1.3 solar masses) expanded into its red giant phase. The star then blew out its outer layers leaving behind the helium-rich core (which is WD 0032−317).

WD 0032−317 b

The orbiting brown dwarf, WD 0032−317 b, was massive enough to survive the red giant's nova event.^[2] It is an extremely hot and very large (75-88 Jupiter masses) brown dwarf that orbits WD 0032−317. One orbit from WD 0032−317 b takes only 2.5 hours. This object is tidally locked to its star with a day side temperature of 8,000 K (7,730 °C; 13,940 °F) and a night temperature of about 2,000 K (1,730 °C; 3,140 °F) making its temperature equivalent to a planet orbiting close to a late stage B-type star. The intense ultraviolet (UV) exposure can break down the molecules in WD 0032−317's atmosphere and vaporize materials from the surface of the brown dwarf.^[3][4][5]