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Naines blanches
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Naines blanches

Les naines blanches sont les noyaux chauds et extrêmement denses qui subsistent après que des étoiles semblables à notre Soleil ont épuisé leur combustible. Imaginez compresser la masse du Soleil tout entier dans le volume de notre Terre ; le résultat serait un objet si dense qu'une cuillère à café de sa matière pèserait des tonnes. Dans notre système solaire, le Soleil perdra un jour ses couches externes pour devenir une naine blanche, un vestige de la taille d'une planète se refroidissant lentement. Ces corps représentent le stade évolutif final de la plupart des étoiles et nous montrent le destin futur de notre propre système planétaire.
  • Percentage of Naines blanches within 98.5 années lumière: 4.93 % (469 from 9522 stars)
  • Average masse of Naines blanches: 20-140% solar mass
  • Average rayon of Naines blanches: 0.7-1.5% solar radius
  • Average température of Naines blanches: 5000-150000 K

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Latest news from Naines blanches

Evaporating planet explains gaseous disk formation around white dwarf WD J0914+1914
icon9. 8. 2026
iconÉtoiles | Exoplanètes | Naines blanche
Image: Evaporating planet explains gaseous disk formation around white dwarf WD J0914+1914
The white dwarf WD J0914+1914 is surrounded by a ring of gas containing hydrogen, oxygen, and sulfur. This material originates from a nearby Neptune-like or super-puff planet—a planet with a very low density—that is losing its atmosphere due to intense radiation from the star. The escaping gas forms a disk around the star, which is then slowly pulled onto the white dwarf's surface, creating the unique light signals observed by instruments. Advanced simulations were used to model the atmos...
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Wide-orbit stellar companions influence formation of giant planets around Red dwarf stars
icon1. 8. 2026
iconÉtoiles | Exoplanètes | TESS | Naines rouges | Formation des planètes | Naines blanche
Image: Wide-orbit stellar companions influence formation of giant planets around Red dwarf stars
The giant planet TOI-5628Ab orbits a Red dwarf star every 4.34 days. Observations reveal that Red dwarfs with close-in giant planets are 6 times more likely to have a distant stellar companion, suggesting these neighbors influence planetary migration....
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Atmosphere of planet WD 1856 b contains hydrocarbons and aerosols
icon5. 7. 2026
iconÉtoiles | Exoplanètes | Atmosphères planétaires | Naines blanche
Image: Atmosphere of planet WD 1856 b contains hydrocarbons and aerosols
The atmosphere of planet WD 1856 b, orbiting a white dwarf star, contains hydrocarbons and aerosols. Data from the James Webb Space Telescope reveal the planet is significantly warmer than expected, pointing to a past reheating event during its orbital migration....
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Nova eruption of RS Ophiuchi in 2021 generated million-degree gas and transformed the companion red giant
icon8. 3. 2026
iconÉtoiles | Naines blanches | Géante
Image: Nova eruption of RS Ophiuchi in 2021 generated million-degree gas and transformed the companion red giant
RS Ophiuchi’s 2021 nova eruption was tracked in near-infrared light, revealing million-degree coronal gas and possible changes in the red giant star’s type after the event....
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Secondary star in omicron Ceti (Mira B) might be a very low mass white dwarf
icon1. 3. 2026
iconNaines blanches | Étoile
Image: Secondary star in omicron Ceti (Mira B) might be a very low mass white dwarf
Mira B is likely an extremely low-mass white dwarf, accreting material via Wind Roche Lobe Overflow. Photometric data reveal short-term variability and support a mass of just 0.24 solar masses. #Astrophysics #WhiteDwarfs...
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