Qatar-2 is a K-type main-sequence star about 595 light-years away in the constellation of Virgo. The star is much older than Sun, and has a concentration of heavy elements similar to solar abundance.[2] The star features a numerous and long-lived starspots,[4] and belongs to a peculiar variety of inflated K-dwarfs with strong magnetic activity inhibiting internal convection.[6]
In 2011 a transiting superjovian planet Qatar-2b was detected by the Qatar Exoplanet Survey.[2] The planet has a large measured temperature difference between dayside (1368±32 K) and nightside (724±135 K).[7] The planetary orbit is well aligned with the equatorial plane of the star,[5] misalignment angle equal to 4.3±4.5◦.[8] No orbital decay was detected.[9] The color of planetary atmosphere is blue due to Rayleigh scattering of light,[8] and albedo is very low, being below 0.06.[9]
An additional massive companion on wide orbit was suspected in 2011,[2] but search utilizing transit-timing variation method has yielded zero results in 2017.[4]
This main-sequence-star-related article is a stub. You can help Wikipedia by expanding it.
This extrasolar-planet-related article is a stub. You can help Wikipedia by expanding it.
Lokasi Pengunjung: 3.12.150.151