Astronomers Discover the Hottest Brown Dwarf Ever!
Meet WD0032-317B — a record-breaking brown dwarf orbiting a white dwarf 1,400 light-years away, with a blazing day-side temperature between 7,250–9,800 K — hotter than the Sun’s surface (5,778 K)!
Spotted in a tight 2.3-hour orbit, this object is tidally locked, with a wild temperature swing of nearly 6,000 K between its day and night sides — far more extreme than even the famous exoplanet KELT-9b.
Key Highlights:
Mass: 75–88 Jupiter masses
Orbit: Just 2.3 hours around its white dwarf star
Host Star: 37,000 K, only 40% the mass of the Sun
Night Side: Cools to 1,300–3,000 K
Extreme UV Radiation is stripping its hydrogen-rich atmosphere apart
Why It Matters:
This discovery provides a rare window into how ultra-hot environments affect giant planets and brown dwarfs. It also shows how compact white dwarfs offer a unique observational advantage over larger stars like blue supergiants.
Published in Nature Astronomy (2023)
Title: “An irradiated-Jupiter analogue hotter than the Sun”
By: Na’ama Hallakoun et al.
Meet WD0032-317B — a record-breaking brown dwarf orbiting a white dwarf 1,400 light-years away, with a blazing day-side temperature between 7,250–9,800 K — hotter than the Sun’s surface (5,778 K)!
Spotted in a tight 2.3-hour orbit, this object is tidally locked, with a wild temperature swing of nearly 6,000 K between its day and night sides — far more extreme than even the famous exoplanet KELT-9b.
Key Highlights:
Mass: 75–88 Jupiter masses
Orbit: Just 2.3 hours around its white dwarf star
Host Star: 37,000 K, only 40% the mass of the Sun
Night Side: Cools to 1,300–3,000 K
Extreme UV Radiation is stripping its hydrogen-rich atmosphere apart
Why It Matters:
This discovery provides a rare window into how ultra-hot environments affect giant planets and brown dwarfs. It also shows how compact white dwarfs offer a unique observational advantage over larger stars like blue supergiants.
Published in Nature Astronomy (2023)
Title: “An irradiated-Jupiter analogue hotter than the Sun”
By: Na’ama Hallakoun et al.
Astronomers Discover the Hottest Brown Dwarf Ever!
Meet WD0032-317B — a record-breaking brown dwarf orbiting a white dwarf 1,400 light-years away, with a blazing day-side temperature between 7,250–9,800 K — hotter than the Sun’s surface (5,778 K)!
Spotted in a tight 2.3-hour orbit, this object is tidally locked, with a wild temperature swing of nearly 6,000 K between its day and night sides — far more extreme than even the famous exoplanet KELT-9b.
Key Highlights:
Mass: 75–88 Jupiter masses
Orbit: Just 2.3 hours around its white dwarf star
Host Star: 37,000 K, only 40% the mass of the Sun
Night Side: Cools to 1,300–3,000 K
Extreme UV Radiation is stripping its hydrogen-rich atmosphere apart
Why It Matters:
This discovery provides a rare window into how ultra-hot environments affect giant planets and brown dwarfs. It also shows how compact white dwarfs offer a unique observational advantage over larger stars like blue supergiants.
Published in Nature Astronomy (2023)
Title: “An irradiated-Jupiter analogue hotter than the Sun”
By: Na’ama Hallakoun et al.
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