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Stellar Brief: 19. 10. 2026
The cold brown dwarf WISE 0855 has weather that looks strikingly planet-like: James Webb observations reveal patchy water clouds and changing atmospheric gases, including carbon monoxide and phosphine.
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Latest astronomy zprávy
10. 2. 2026
Hvězdy | Exoplanety | Bílí trpaslíci | Vesmírný dalekohled Jamese WebbUsing the James Webb Space Telescope (JWST), astronomers have conducted a detailed analysis of WD0806 b, one of the coldest planets ever photographed outside our Solar System. Orbiting a white dwarf at a massive distance—about 60 times further than Pluto is from our Sun—this gas giant has temperatures of only 350 K (roughly 77°C). The study identified a cocktail of chemicals in its atmosphere, including water, methane, and carbon dioxide.
For the first time, researchers were able to measure ...
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10. 2. 2026Hvězdy | ExoplanetyAstronomers have confirmed a complex multiplanet system orbiting Lacaille 9352 (also Gliese 887, HD 217987) - a bright red dwarf star only 11 light years away. Using high-precision instruments, the team identified two new worlds: a small planet roughly the mass of Earth with a very short 4-day orbit, and a larger 'super-Earth' located within the star's habitable zone, where temperatures could allow for liquid water.
This super-Earth, which ta...
Read article 9. 2. 2026By studying the swirling disk of gas and dust around the star AB Aur, astronomers are gaining a clearer picture of the raw materials available for building new worlds. Using the NOEMA radio interferometer, researchers measured the ratio of carbon to oxygen—a key indicator of a planet's future atmosphere—by observing specific molecules like carbon monosulfide and sulfur monoxide.
The data suggests that this 'planetary nursery' is carbon-rich b...
Read article 8. 2. 2026HvězdyScientists have uncovered the unusual characteristics of V658 Car, a binary star system that has recently undergone a dramatic 'makeover' through mass transfer. The system consists of a rapidly spinning Be-type star and a smaller, hot companion.
The main star is spinning at a staggering 336 km/s—fast enough to fling material into a massive glowing disk that stretches 42 times the radius of our Sun. Surprisingly, the study found that this star...
Read article 8. 2. 2026Hvězdy | MeerKATA new study exploring the heart of our Galaxy has identified 137 stars that shine in both radio waves and X-rays, providing a clearer picture of stellar magnetic activity. By combining data from the MeerKAT radio telescope and the eROSITA X-ray satellite, researchers tested the famous Güdel-Benz relation, which usually links a star's heat-driven X-rays to its high-energy radio flares.
The findings reveal that many stars in the Galactic plane ...
Read article 8. 2. 2026Exoplanety | HvězdyRecent research into tidal interactions reveals that internal gravity waves within stars play a fundamental role in the fate of 'hot Jupiters' — massive gas giants orbiting very close to their stars. By analyzing how these waves dissipate energy, scientists found that up to 20% of stars similar to our Sun may have already engulfed a large planet, which explains why some stars like TOI-2458 and Gliese 504 rotate faster than expected.
The study...
Read article 6. 2. 2026ALMA | Hvězdy | Mladé hvězdné objektyUsing the ALMA telescope, astronomers have captured deep polarization images of the disk surrounding the star PDS 70, a unique system known for hosting two actively forming planets.
By analyzing how light scatters off dust particles in the massive ring surrounding the star, researchers discovered that the dust grains are surprisingly small, reaching a maximum size of only about 0.1 millimeters. This suggests that even in environments where pla...
Read article 5. 2. 2026Hvězdy | Hnědí trpaslíciAstronomers have identified four new transiting brown dwarfs, objects that are more massive than planets like Jupiter but smaller than stars. Three of these objects have unusually long orbits lasting over 100 days, significantly increasing the known population of such systems.
The study found that while brown dwarfs on short orbits usually circle metal-rich stars, those on longer orbits tend to be found around metal-poor stars, much like low-...
Read article 5. 2. 2026HvězdyAstronomers have discovered a highly complex and ever-changing environment in the inner regions of the HD 142527 A star system, where planets typically form.
By using advanced infrared telescopes, researchers found that the dust disc surrounding the star is not a simple symmetrical ring, but a chaotic structure that shifts and changes from year to year. Surprisingly, the dust reaches much closer to the star than previously thought, extending ...
Read article 5. 2. 2026Hvězdy | ExoplanetyScientists have conducted a detailed follow-up study of the young planet HIP 67522 b to pin down its exact size and weight. Located in a star system only 17 million years old—a mere blink of an eye compared to our 4.5-billion-year-old solar system—this planet is roughly the size of Neptune but significantly less dense.
By measuring how the planet's gravity tugs on its parent star, researchers determined it has a much lower mass than expected ...
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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 |
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