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Naines brunes
Les naines brunes sont des « étoiles ratées », entre les planètes géantes comme Jupiter et les vraies étoiles. Leur cœur ne permet pas la fusion stable de l'hydrogène comme le Soleil, mais seulement une combustion limitée de deutérium. En orbite, elles ressemblent à de lointaines cousines des planètes, mais certaines errent seules. Leurs températures sont bien plus basses que celles des étoiles, refroidissant parfois jusqu'à des niveaux terrestres.
- Percentage of Naines brunes within 98.5 années lumière: 12.24 % (1165 from 9521 stars)
- Average masse of Naines brunes: 1.2-8.0% solar mass
- Average rayon of Naines brunes: 9-11% solar radius
- Average température of Naines brunes: 600-2500 K
Naines brunes
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Naines brunes
| Nom de l étoile | Masse | distance | ||
|---|---|---|---|---|
|
|
Luhman 16 LUH 16, Luhman–WISE 1, WISE J104915.57−531906.1, DENIS-P J104919.0−531910, 2MASS J10491891−5319100, IRAS Z10473-5303, AKARI J1049166−531907, GSC2.2 S11132026703, GSC2.3 S4BM006703 |
L7.5 | 0.03 M☉ | 6.5 ly |
|
|
Luhman 16 B | T0.5 | 0.03 M☉ | 6.5 ly |
|
|
WISE 0855-0714 WISEA J085510.74-071442.5, WISE J085510.83-071442.5 |
Y2 | 0.01 M☉ | 7.3 ly |
|
|
2MASS J1812-2608 2MASS J18121245-2608024, IRAS 18090-2608, TIC 264867486, OGLE BLG-LPV-225466, Gaia DR2 4064714550310189440 |
T | 0.02 M☉ | 11.6 ly |
|
|
Epsion Indi Bb | T6 | 0.05 M☉ | 12 ly |
Naines brunes
Latest news from Naines brunes
Massive brown dwarf HD 203771 b confirmed in eccentric orbit around orange dwarf
14. 10. 2026
Étoiles | Exoplanètes | Naine orange | Naines bruneThe massive brown dwarf known as HD 203771 b has been characterized as orbiting its host orange dwarf star once every 1140 days. Brown dwarfs are often called failed stars because they are more massive than planets but not heavy enough to sustain the nuclear fusion that powers stars. This particular companion follows an eccentric, or elongated, path that is inclined at an angle of approximately 130 degrees relative to its host. The host star itself has a mass estimated at 0.79 times that of the ...
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9. 10. 2026Étoiles | Naines brunes | Atmosphères planétaireAnalysis of three early L-dwarfs, HD 89744 B, Gliese 1048 B, and LSPM J0632+5053 B, reveals gaseous silicon monoxide and silicate clouds in their atmospheres. JWST data confirms these mineral clouds form as silicon gas condenses, mimicking processes in giant planets....
9. 10. 2026Étoiles | Exoplanètes | Naines bruneA new exoplanet candidate, PALTA-1 b, has been identified orbiting the nearby ultracool dwarf star DENIS-P J1253108-570924. The planet, which has a mass roughly equivalent to a fraction of Jupiter, was found after eight years of precise positional monitoring....
9. 10. 2026Étoiles | Naines bruneRadio observations of the L3.5 dwarf LSPM J0036+1821 reveal Jupiter-like auroral activity. The star shows a 3.08-hour rotation period and persistent magnetic pulses driven by electron interactions in its magnetosphere....
25. 9. 2026Étoiles | Naines brunes | Télescope spatial James Webb | GaiBrown dwarf WISEA J155349.96+693355.2 is the first of its kind linked to the Gaia-Enceladus substructure. JWST data reveals its metal-poor atmosphere and an extreme, eccentric orbit, confirming its origin as an accreted object from an ancient galaxy collision....
Research in Gaia
Parcourez les dernières études scientifiques sur les étoiles et les exoplanètes de notre galaxie. Découvrez les dernières recherches en astrophysique et en astronomie stellaire.
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