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Stellar Brief: 19. 10. 2026
One of the coldest worlds near the Sun is showing surprisingly lively weather: JWST observations reveal patchy water clouds and changing atmospheric gases on the brown dwarf WISE 0855, which is only about 265 kelvin—colder than a winter’s day on Earth. Read today's Stellar Brief

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Latest astronomy zprávy

Long-term study of pulsar nulling in PSR J1048-3832 and others reveals evolving emission behaviour
icon28. 2. 2026
iconHvězdy | Neutronové hvězdy
Image: Long-term study of pulsar nulling in PSR J1048-3832 and others reveals evolving emission behaviour
Pulsars are highly magnetised, rapidly rotating neutron stars — the ultra-dense remnants left behind when a massive star ends its life in a supernova explosion. They emit narrow beams of radio waves that sweep across space like a lighthouse, producing precise pulses detectable by radio telescopes on Earth. Some pulsars display a puzzling behaviour called nulling, where their radio emission abruptly becomes undetectable, or drops far below its normal level, for periods ranging from a handful of p...
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High-speed photometry reveals fine structure of flares on star AD Leonis
icon28. 2. 2026
iconHvězdy | Červení trpaslíci
Image: High-speed photometry reveals fine structure of flares on star AD Leonis
AD Leonis (AD Leo) is an active M-dwarf — a small, cool red star — located about 16 light-years from Earth that is known for producing frequent and energetic flares. Stellar flares are intense, brief brightenings caused by magnetic reconnection, a process in which tangled magnetic field lines snap and realign, releasing a burst of energy as light across many wavelengths, similar to solar flares but often far more powerful relative to the star's s...
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Hints of a stratosphere in the atmosphere of warm Neptune Gliese 436 b
icon28. 2. 2026
iconHvězdy | Exoplanety | Atmosféry plane
Image: Hints of a stratosphere in the atmosphere of warm Neptune Gliese 436 b
Gliese 436 b is a warm Neptune — a planet roughly the size and mass of Neptune — orbiting the red dwarf star Gliese 436, located about 33 light-years from Earth. Astronomers used the Keck II telescope on Mauna Kea, Hawaii, fitted with an instrument called KPIC (Keck Planet Imager and Characterizer). KPIC routes starlight through a hair-thin single-mode optical fiber before feeding it into a high-resolution spectrograph — a technique that suppress...
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James Webb Telescope spots shifting dust disks around young stars Sz 96 and IP Tau
icon27. 2. 2026
iconHvězdy | Exoplanety
Image: James Webb Telescope spots shifting dust disks around young stars Sz 96 and IP Tau
Astronomers comparing new James Webb Space Telescope data with 20-year-old Spitzer observations have discovered significant changes in the dusty, planet-forming disks surrounding two young stars, Sz 96 and IP Tau. The study found that the infrared light emitted by silicates—minerals similar to sand or rocks—shifted in brightness by up to 35%, suggesting that the inner structure of these disks is physically changing over time. Furthermore, the ...
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James Webb Space Telescope observes the cloudy sub-Neptune HD 15337 c
icon27. 2. 2026
iconHvězdy | Exoplanety | Vesmírný dalekohled Jamese Webb
Image: James Webb Space Telescope observes the cloudy sub-Neptune HD 15337 c
Researchers using the James Webb Space Telescope have analyzed the atmosphere of the sub-Neptune planet HD 15337 c, which is about 2.5 times the size of Earth. The study revealed a 'featureless' spectrum, meaning the planet's atmosphere is likely very thick, enriched with heavy elements, or covered in high-altitude clouds and haze. Interestingly, the planet arrived for its transit earlier than expected, suggesting the presence of an undiscove...
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James Webb Space Telescope probes the mysterious atmosphere of radius-valley planet TOI-260 b
icon27. 2. 2026
iconHvězdy | Exoplanety
Image: James Webb Space Telescope probes the mysterious atmosphere of radius-valley planet TOI-260 b
Using the James Webb Space Telescope, astronomers have examined the atmosphere of TOI-260 b, a planet roughly 1.7 times the size of Earth that sits in the mysterious 'radius valley'—a gap where few planets are found. The observations revealed a mostly flat spectrum, suggesting the planet might have a very heavy atmosphere enriched with elements other than hydrogen and helium, or perhaps hidden by high-altitude clouds. While a small potential s...
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Future ELT telescope will reveal the atmospheres of sub-Neptune planets V1298 Tau b and TOI-451 c
icon27. 2. 2026
iconHvězdy | Exoplanety | Atmosféry planet | ELT
Image: Future ELT telescope will reveal the atmospheres of sub-Neptune planets V1298 Tau b and TOI-451 c
This study explores the capabilities of the upcoming Extremely Large Telescope (ELT) and its ANDES instrument in analyzing the atmospheres of young, distant planets similar to Neptune but smaller. By simulating observations of the exoplanets V1298 Tau b and TOI-451 c, researchers demonstrated that we will soon be able to detect water, hydrogen sulfide, and carbon monoxide on these worlds. The research highlights that by carefully comparing dat...
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Discovery of circumstellar disks around young brown dwarf candidates like DENIS J0534552-104808
icon27. 2. 2026
iconHvězdy | Exoplanety | Hnědí trpaslíci | Vznik plane
Image: Discovery of circumstellar disks around young brown dwarf candidates like DENIS J0534552-104808
Researchers have successfully identified 23 nearby young objects, mostly brown dwarfs, that are surrounded by circumstellar disks of gas and dust. By analyzing data from several space missions and ground-based telescopes, the study found that these disks—the birthplaces of potential rocky planets—exist even around very low-mass objects. Highlights include the detection of ten entirely new disk-bearing candidates and evidence of long-lived accr...
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Eating planets makes the star Gliese 504 appear younger
icon27. 2. 2026
iconHvězdy | Exoplanety
Image: Eating planets makes the star Gliese 504 appear younger
The Sun-like star GJ 504 presents a cosmic mystery: despite being roughly 2 billion years old, it rotates rapidly and possesses an intense magnetic field typical of a much younger star. This study investigates the theory that GJ 504 'rejuvenated' itself by swallowing a Jupiter-sized planet. By mapping the star's magnetic field and simulating its stellar winds, researchers found that the star's current high-energy state and rotation speed cann...
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Magnetospheric accretion in the DF Tauri binary star system
icon27. 2. 2026
iconHvězdy | Mladé hvězdné objekty
Image: Magnetospheric accretion in the DF Tauri binary star system
This research investigates how young stars grow by pulling in material from their surrounding environment, specifically within the DF Tauri binary system. By using high-resolution observations, astronomers analyzed the primary star in this pair to see if its companion affects how it 'feeds' on gas and dust. They found that despite being part of a double-star system, the primary star follows a traditional growth model where a strong magnetic f...
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Nově objevené exoplanety

EK Chamaeleontis b 10 / 2026 2702.2 M⊕ 321.3 ly
HD 715 b 10 / 2026 201.9 M⊕ 542.8 ly
DENIS J1253-5709 b 10 / 2026 244.8 M⊕ 54.4 ly
TOI-6417 b 09 / 2026 349.7 M⊕ 1903.9 ly
TOI-6443 b 09 / 2026 1605.4 M⊕ 2051.6 ly
TOI-7219 b 09 / 2026 661 M⊕ 1074.2 ly
TOI-4079 B b 09 / 2026 1646.8 M⊕ 1185.6 ly
HD 45652 b 09 / 2026 1557.7 M⊕ 113.9 ly
LSPM J0804+1116 b 09 / 2026 6.4 M⊕ 82.6 ly
HR 8799 f 09 / 2026 524.5 M⊕ 133.3 ly
61 Cygni A b 09 / 2026 2543.3 M⊕ 11.4 ly
TOI-5646 b 08 / 2026 45.9 M⊕ 1352.3 ly
TOI-4468 c 08 / 2026 11.1 M⊕ 1233.1 ly
TOI-4468 b 08 / 2026 170.1 M⊕ 1233.1 ly
TOI-4468 d 08 / 2026 311 M⊕ 1233.1 ly
Newly discovered exoplanets
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