This week in astronomy news, space telescopes showed us that white dwarfs are crystallizing in their cores and cloudy night skies are universal among hot Jupiters. The gaseous atmospheres of giant planets may evaporate and accrete onto the dense surfaces of white dwarfs, providing astronomers a … The irradiating flux from hot white dwarfs (80,000–30,000 K) can exceed those of the young Sun by many orders of magnitude. : Procyon B 10 nearest white dwarfs Star Distance Comments Notes Refs Sirius B: 8.58 ly (2.63 pc) Sirius B is also the first white dwarf discovered. Hot White Dwarfs May Reveal Cold Gas Giants . White dwarfs are the roughly Earth-size stellar cinders that remain after a … At 16th magnitude, the hot subdwarf (sdB, sdO) number counts are increasing by about a factor of 2 per mag, the hot white dwarfs by 4 per mag, and quasars by 8 per mag. White dwarf stars are characterized by a low luminosity, a mass on the order of that of the Sun, and a radius comparable to that of Earth. Stack Exchange network consists of 177 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.. Visit Stack Exchange

It is part of the Sirius system. White Dwarfs' Crystal Cores. The role of helium radiative levitation in the envelopes of hot DA white dwarfs is investigated. Q&A for active researchers, academics and students of physics.

... White dwarfs evolve from stars with an initial mass of up to three or four solar masses or even possibly higher. This intense EUV radiation can cause atmospheric escape in giant planets located at separations as large as 100 au.

This is motivated by the presence of photospheric traces of helium inferred from short-wavelength observations of several hot DA white dwarfs or measured from optical observations of even hotter DAO stars.