What is the hottest star with a known planet?
The hottest star known to hold a planet is 2MASS J19383260+4603591, with a surface temperature near 29,564 K, roughly five times hotter than the Sun. Everything about 2MASS J19383260+4603591 →
| # | Star | Surface temperature | Distance |
|---|---|---|---|
| ★ 1 | 2MASS J19383260+4603591 | 29,564 K | 1,293 ly |
| 2 | V0391 Peg | 29,300 K | 3,901 ly |
| 3 | mu2 Sco | 21,700 K | distance unknown |
| 4 | ZTF J1828+2308 | 15,900 K | 658 ly |
| 5 | DP Leo | 13,500 K | 997 ly |
| 6 | kap And | 11,327 K | 163 ly |
| 7 | HIP 78530 | 10,500 K | 446 ly |
| 8 | WD 0806-661 | 10,393 K | 62.8 ly |
| 9 | HD 97048 | 10,000 K | 600 ly |
| 10 | ZTF J1230-2655 | 10,000 K | 609 ly |
| 11 | AB Aur | 9,770 K | 529 ly |
| 12 | HD 135344 A | 9,540 K | 462 ly |
| 13 | WASP-178 | 9,360 K | 1,395 ly |
| 14 | KELT-9 | 9,270 K | 667 ly |
| 15 | HIP 79098 AB | 9,194 K | 476 ly |
| 16 | HIP 65426 | 8,840 K | 355 ly |
| 17 | KELT-20 | 8,720 K | 445 ly |
| 18 | HD 56414 | 8,500 K | 888 ly |
| 19 | Kepler-1115 | 8,480 K | 3,207 ly |
| 20 | HAT-P-70 | 8,450 K | 1,079 ly |
| 21 | HIP 54515 | 8,100 K | 270 ly |
| 22 | bet Pic | 8,039 K | 64.4 ly |
| 23 | HIP 99770 | 8,000 K | 131 ly |
| 24 | WASP-189 | 8,000 K | 325 ly |
| 25 | HATS-70 | 7,930 K | 4,758 ly |
Showing the top 25 of 4,440 that qualify.
The hottest stars with planets are usually not ordinary stars. A hot subdwarf or a white dwarf is the stripped or burnt-out core of a star that has already finished its life, and an exposed core starts out far hotter than any living stellar surface. Their planets, where they survive, are survivors of the host's death or bodies that formed afterwards from the debris.
Temperature here is the measured effective temperature from the NASA Exoplanet Archive, not a value inferred from colour, and the ranking is held to stars with at least one undisputed planet. The Sun runs at 5,772 K for comparison. What could unseat this record: planet searches around hot subdwarfs and white dwarfs are young, and each new detection tends to be hotter than the last.
What is the hottest star with a known planet?
The hottest star known to hold a planet is 2MASS J19383260+4603591, with a surface temperature near 29,564 K, roughly five times hotter than the Sun.
How hot is the hottest star with a planet?
2MASS J19383260+4603591 has a surface near 29,564 K. The Sun's surface, by comparison, is 5,772 K, and its light looks white rather than the fierce blue of a star this hot.
Can a planet survive around a star that hot?
Some do, but rarely unchanged. A star this hot is usually a stellar remnant, which means the planet lived through its host expanding into a giant and then collapsing. The survivors tend to be either far out, or dense cores whose atmospheres were stripped away in the process.
What colour is a star that hot?
Blue-white, and mostly invisible: the hotter a star gets, the more of its output moves into the ultraviolet, so a 30,000 K star radiates far more energy than the eye can see.
Keep exploring: all records · the hottest stars we hold · the coolest star with a planet