WD 0032−317#WD 0032−317 b
{{Short description|White dwarf system with a hot brown dwarf}}
{{Starbox begin
| name = WD 0032−317
}}
{{Starbox observe
| epoch =
| equinox =
| constell = Sagittarius
| pronounce =
| ra = {{RA|00|34|49.8573}}
| dec = {{DEC|−31|29|52.686}}
| appmag_v =
}}
{{Starbox character
| type = White dwarf
}}
{{Starbox astrometry
| parallax = {{val|2.320|0.053}}
| dist_pc = {{val|431.1|9.8}}
}}
{{Starbox orbit
| reference =
| primary = WD 0032−317
| name =
}}
{{Starbox detail
| source =
| component1 = WD 0032−317
| mass = {{val|0.4187|0.0047}} (He-core)
{{val|0.386|0.014}} (Hybrid-core)
| radius = {{val|0.0266|0.0012}}
| temperature = {{val|36965|100}}
| component2 = WD 0032−317 b
| mass2 = {{val|0.0812|0.0029}} (He-core)
{{val|0.0750|0.0037}} (Hybrid-core)
| radius2 = {{val|0.0789|0.0085|0.0083}} (He-core)
{{val|0.0747|0.0085|0.0079}} (Hybrid-core)
| temperature2 = {{val|5126|28}} (He-core)
{{val|5111|41}} (Hybrid-core) (equilibrium temperature)
}}
{{Starbox catalog
| names = 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
}}
{{Starbox reference
| Simbad = WD+0032-317
}}
{{Starbox end}}
WD 0032−317 is a low mass white dwarf star orbited by brown dwarf WD 0032−317 b.
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WD 0032−317
The white dwarf WD 0032−317 is located about 1,400 light years from Earth.{{Cite web | last=Atkinson |first=Nancy |date=2023-08-17 |title=This Brown Dwarf is 2,000 Degrees Hotter Than the Sun |url=https://www.universetoday.com/162810/this-brown-dwarf-is-2000-degrees-hotter-than-the-sun/ |access-date=2023-08-28 |website=Universe Today |language=en-US}} 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.{{Cite web | last=Yirka |first=Bob |last2=Phys.org |title=Discovery of a Brown Dwarf Hotter Than the Sun |url=https://phys.org/news/2023-06-discovery-brown-dwarf-hotter-sun.html |access-date=2023-08-28 |website=phys.org |language=en}} 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 {{cvt|8000|K|C F}} and a night temperature of about {{cvt|2000|K|C 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.{{Cite journal | last=Hallakoun |first=Na’ama |last2=Maoz |first2=Dan |last3=Istrate |first3=Alina G. |last4=Badenes |first4=Carles |last5=Breedt |first5=Elmé |last6=Gänsicke |first6=Boris T. |last7=Jha |first7=Saurabh W. |last8=Leibundgut |first8=Bruno |last9=Mannucci |first9=Filippo |last10=Marsh |first10=Thomas R. |last11=Nelemans |first11=Gijs |last12=Patat |first12=Ferdinando |last13=Rebassa-Mansergas |first13=Alberto |date=2023-08-14 |title= An Irradiated-Jupiter Analogue Hotter Than the Sun |url=https://www.nature.com/articles/s41550-023-02048-z |journal=Nature Astronomy |language=en |pages=1–12 |doi=10.1038/s41550-023-02048-z |issn=2397-3366|arxiv=2306.08672 }}{{cite web |last1=Gamillo |first1=Elizabeth |title=Astronomers Find a Brown Dwarf That’s Hotter Than the Sun {{!}} Astronomy.com |url=https://www.astronomy.com/science/astronomers-find-a-brown-dwarf-thats-hotter-than-the-sun/ |website=Astronomy Magazine |access-date=28 August 2023 |date=15 August 2023}}{{cite web |title= A Brown Dwarf Star Serves as an Ultrahot-Jupiter Analogue |url=https://pubs.aip.org/physicstoday/online/42662/A-brown-dwarf-star-serves-as-an-ultrahot-Jupiter |website=pubs.aip.org |access-date=28 August 2023}}
References
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{{Sagittarius (constellation)}}
Category:Sagittarius (constellation)
Category:Planetary systems with one confirmed planet
{{whitedwarf-star-stub}}