| 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 | |
WD 0032−317 is a low mass white dwarf star orbited by brown dwarf WD 0032−317 b.
WD 0032−317[edit]
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[edit]
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]
References[edit]
- ^ Atkinson, Nancy (2023-08-17). "This Brown Dwarf is 2,000 Degrees Hotter Than the Sun". Universe Today. Retrieved 2023-08-28.
- ^ Yirka, Bob; Phys.org. "Discovery of a Brown Dwarf Hotter Than the Sun". phys.org. Retrieved 2023-08-28.
- ^ Hallakoun, Na’ama; Maoz, Dan; Istrate, Alina G.; Badenes, Carles; Breedt, Elmé; Gänsicke, Boris T.; Jha, Saurabh W.; Leibundgut, Bruno; Mannucci, Filippo; Marsh, Thomas R.; Nelemans, Gijs; Patat, Ferdinando; Rebassa-Mansergas, Alberto (2023-08-14). "An Irradiated-Jupiter Analogue Hotter Than the Sun". Nature Astronomy: 1–12. arXiv:2306.08672. doi:10.1038/s41550-023-02048-z. ISSN 2397-3366.
- ^ Gamillo, Elizabeth (15 August 2023). "Astronomers Find a Brown Dwarf That's Hotter Than the Sun | Astronomy.com". Astronomy Magazine. Retrieved 28 August 2023.
- ^ "A Brown Dwarf Star Serves as an Ultrahot-Jupiter Analogue". pubs.aip.org. Retrieved 28 August 2023.
