韋伯拍攝到紅矮星周圍的塵埃盤 AU Mic周圍的塵埃盤
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http://www.sci-news.com/astronomy/two-exoplanets-hd-260655-10793.html 新發現2顆岩質系外行星繞紅矮星 HD 260655 , 軌道分別 2.8 5.7天 .
HD 260655 is a high proper motion star in the Gemini constellation located at a distance of approximately 10 parsecs (33 light-years). Also known as Gliese 239, TOI-4599, LHS 1858, HIC 31635 and Wolf 287, the star is among the brightest early-type M dwarfs in the sky.
HD 260655 hosts two transiting exoplanets on orbits with periods of 2.8 and 5.7 days.
The inner planet, named HD 260655b, is 1.24 times the size of Earth, and has 2.14 times the mass.
Dubbed HD 260655c, the outer planet is 1.53 times larger than Earth and 3.1 times more massive.
“At a distance of 10 parsecs, HD 260655 becomes the fourth closest known multi-transiting planet system after HD 219134, LTT 1445A, and AU Mic,” the astronomers said.
HD 260655b and HD 260655c were detected by the TESS mission and confirmed independently with archival and new radial velocity data obtained with the HIRES high-resolution spectrograph on the 10-m Keck-I telescope on Mauna Kea, Hawai’i, and the CARMENES high-resolution spectrograph on the 3.5-m telescope at the Calar Alto Observatory in Spain since 1998 and 2016, respectively.
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