2 using the atacama large millimeter/submillimeter array (alma) have observed what may be the first-ever signs of windy weather around a t tauri star, an infant
3 of our own sun. this may help explain why some t tauri stars have disks that glow
4 in
5 light while others shine in a more expected fashion. t tauri stars are the infant versions of stars like our sun. they are
6 normal, medium-size stars that are surrounded by the raw materials to build both rocky and
7 planets. though nearly invisible in optical light, these disks shine in both infrared and millimeter-wavelength light.
"the material in the disk of a t tauri star usually, but not always, emits infrared radiation with a predictable energy distribution," said colette salyk, an
1 with the national optical
8 9 (noao) in tucson, ariz., and lead author on a paper published in the astrophysical journal. "some t tauri stars, however, like to act up by emitting infrared radiation in unexpected ways."
to account for the different infrared signature around such similar stars, astronomers propose that winds may be
10 from within some t tauri stars' protoplanetary disks. these winds could have important implications for planet formation, potentially robbing the disk of some of the gas required for the formation of giant jupiter-like planets, or stirring up the disk and causing the building blocks of planets to change location
11. these winds have been predicted by astronomers, but have never been clearly detected.
using alma, salyk and her colleagues looked for evidence of a possible wind in as 205 n -- a t tauri star located 407 light-years away at the edge of a star-forming region in the
12 ophiuchus, the snake bearer. this star seems to exhibit the strange infrared signature that has
13 astronomers.
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