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Hnědí trpaslíci
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Hnědí trpaslíci

Hnědí trpaslíci jsou objekty na pomezí mezi obřími planetami jako Jupiter a skutečnými hvězdami. V jejich nitru neprobíhá stabilní fúze vodíku, která pohání Slunce a další hvězdyve hlavní posloupnosti, ale pouze omezené spalování deuteria. Pokud hnědí trpaslící obíhají hvězdy, vypadají jako vzdálení příbuzní planet, ale existují i osamělí poutníci vesmírem. Jejich teploty jsou mnohem nižší než u hvězd, často chladnou až k teplotám běžným na Zemi.
  • Percentage of Hnědí trpaslíci within 98.5 světelné roky: 12.24 % (1165 from 9520 stars)
  • Average hmotnost of Hnědí trpaslíci: 1.2-8.0% solar mass
  • Average radius of Hnědí trpaslíci: 9-11% solar radius
  • Average teplota of Hnědí trpaslíci: 600-2500 K

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Latest news from Hnědí trpaslíci

Massive brown dwarf HD 203771 b confirmed in eccentric orbit around orange dwarf
icon14. 10. 2026
iconHvězdy | Exoplanety | Oranžový trpaslík | Hnědí trpaslíci
Image: Massive brown dwarf HD 203771 b confirmed in eccentric orbit around orange dwarf
The 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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Silicate clouds and gaseous silicon monoxide identified in three early L-dwarf objects
icon9. 10. 2026
iconHvězdy | Hnědí trpaslíci | Atmosféry plane
Image: Silicate clouds and gaseous silicon monoxide identified in three early L-dwarf objects
Analysis 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....
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Exoplanet candidate PALTA-1 b found orbiting a nearby ultracool dwarf
icon9. 10. 2026
iconHvězdy | Exoplanety | Hnědí trpaslíci
Image: Exoplanet candidate PALTA-1 b found orbiting a nearby ultracool dwarf
A 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....
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Radio aurora in LSPM J0036+1821 shows Jupiter-like magnetic activity
icon9. 10. 2026
iconHvězdy | Hnědí trpaslíci
Image: Radio aurora in LSPM J0036+1821 shows Jupiter-like magnetic activity
Radio 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....
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Brown dwarf WISEA J155349.96+693355.2 linked to ancient galaxy collision
icon25. 9. 2026
iconHvězdy | Hnědí trpaslíci | Vesmírný dalekohled Jamese Webba | Gai
Image: Brown dwarf WISEA J155349.96+693355.2 linked to ancient galaxy collision
Brown 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....
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