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Latest astronomy zprávy
Zůstaňte v obraze s nejnovějšími astronomickými zprávami, objevy o hvězdách a exoplanetách a aktuálním výzkumu. Prozkoumejte čerstvé články ze světa astronomie.
6. 5. 2026
Hvězdy | Exoplanety | Hnědí trpaslíci | SuperzeměAstronomers have discovered a remarkable planetary system around the young star TOI-201, featuring three very different companions: a hot super-Earth, a warm Jupiter, and a highly eccentric brown dwarf. Using long-term radial velocity and transit timing data, the team found that all three objects orbit in the same plane. The brown dwarf, with a mass about 16 times that of Jupiter and an 8-year orbit, is the longest-period transiting object ever characterized by radial velocities and the only kno...
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6. 5. 2026HvězdyHD 20794 is a nearby, metal-poor G-type star hosting a compact planetary system, including a super-Earth near the habitable zone. Scientists used detailed stellar evolution models to study its structure and chemical abundances. By comparing 252 models with observed properties like temperature, gravity, luminosity, and radius, they found the best fit for a star with 0.80 solar masses and an age of about 9 billion years.
The models accurately re...
Read article 6. 5. 2026Hvězdy | Exoplanety | ALMAPDS70c is a young, forming planet still accreting material from its surrounding disk. Using ALMA radio observations at 343 GHz, scientists studied how the planet's radio brightness changes over time. By carefully subtracting the average background signal and analyzing the data in short time intervals, they found that PDS70c's radio emission can vary significantly on hour-long timescales.
In the 2017 data, the planet's radio brightness increase...
Read article 6. 5. 2026Hvězdy | Exoplanety | TESSTOI-4600 is an early K dwarf star with two rare, transiting giant planets on long orbits. TOI-4600b has an orbital period of about 83 days and a mass of nearly 75 Earth masses, while TOI-4600c orbits every 483 days and is about 213 Earth masses. Both planets show significant transit timing variations, with their transits shifting by about an hour, indicating strong gravitational interactions between them.
Researchers combined new TESS data, gr...
Read article 6. 5. 2026Hvězdy | Exoplanety | Vesmírný dalekohled Jamese Webba | Atmosféry planeCOCONUTS-2b is one of the coldest known planetary-mass companions, orbiting far from its M dwarf host star. Using the JWST MIRI/MRS instrument, scientists obtained a detailed spectrum of its atmosphere at a temperature of about 480 K. For the first time, they detected rare isotopologues—molecules with different isotopes—of ammonia and water: ^{15}NH3, H2^{18}O, and H2^{17}O. This is the first clear evidence of oxygen isotopes in water in a cold p...
Read article 6. 5. 2026Hvězdy | Exoplanety | Vesmírný dalekohled Jamese WebbLHS 3844 b is a rocky exoplanet whose surface was studied using mid-infrared spectroscopy from the James Webb Space Telescope. The planet's thermal emission spectrum between 5 and 12 microns matches that of a dark, low-silica surface, such as basalt or olivine-rich rock. The data rule out the presence of fresh powdery surfaces, but space weathering could darken such materials to match the observations.
The spectrum shows no evidence for signif...
Read article 6. 5. 2026Hvězdy | Exoplanety | Atmosféry planet | Horký JupiterMASCARA-5 b (also known as TOI-1431 b) is an ultra-hot Jupiter orbiting a bright Am star. Using the EXPRES spectrograph, scientists confirmed the presence of neutral iron (Fe I) in the planet's dayside atmosphere with high significance. The detection supports previous findings and indicates that the planet's atmosphere is thermally inverted, with temperatures rising from about 2000 K at lower altitudes to around 4500 K higher up.
No evidence w...
Read article 6. 5. 2026Hvězdy | ExoplanetyDelorme 1 (AB)b is a young, massive planet—about 13 times the mass of Jupiter—orbiting a binary star at a wide distance. Using high-resolution optical spectroscopy, scientists detected seven helium emission lines from the planet, which show significant variability and asymmetric profiles. The lines have both narrow and broad components, with the broad part redshifted by about 15 km/s, indicating complex gas motions.
The analysis suggests that ...
Read article 6. 5. 2026Hvězdy | ExoplanetyThe β Pictoris young moving group contains a variety of substellar objects, including gas giants and brown dwarfs. Scientists studied the atmospheric chemistry and isotope ratios of three members: the planetary-mass companion 2MASS J0249-0557 c and two benchmark brown dwarfs. Using high-resolution spectroscopy, they measured the carbon-to-oxygen ratio, metallicity, and the ratio of carbon isotopes in their atmospheres.
2MASS J0249-0557 c, with...
Read article 6. 5. 2026Hvězdy | ExoplanetyGJ 436 b is a warm Neptune-sized planet orbiting a red dwarf star. Scientists used the ESPRESSO spectrograph to observe two transits of the planet, aiming to detect atomic and molecular species in its upper atmosphere. The observations covered a wide range of optical wavelengths and searched for signals from hydrogen, sodium, magnesium, iron, and other elements, as well as molecules like titanium oxide and vanadium oxide.
The analysis found no...
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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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