Astronomers measured the size and mass of planets around star Kepler 138 and found out that two of them might be long sought after water worlds. The exoplanets Kepler 138 c and Kepler 138 d are twice as heavy as the Earth and their radius is 20 % bigger. New research also shows evidence for a fourth planet in the system, which orbits near the inner edge of the star’s habitable zone.
Astronomers discovered 40 examples of unusually small red giants. Stars in this phase are running out of hydrogen in their cores and inflate their outer layers. Astronomers led by Yaguang Li propose that the small red giants come from binary systems, and their matter is being stolen by a smaller star.
Exoplanet Kepler-16 (AB) b orbits a binary star 245 light years from the Sun. It is the first such exoplanet detected with radial velocity method, which measures gravitational influence of the planet on its star.
There is a massive exoplanet in orbit around star Kepler-1704. Long-term radial velocity measuring now show mass of the exoplanet and parameters of its orbit around star. Orbit of this exoplanet is highly eccentric with periastron (closest to the star) 0.16 AU a apoastron 3.9 AU (furthest from the star).
Scientists found very special flash in the data from the space telescope Kepler mission. It came before SN2017jgh supernova explosion and can tell a lot about the progenitor star. This is the first time such a flash was detected.
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7. 3. 2009
24. 12 2022
Exoplanets
