TW-Hydrae Association
The TW-Hydrae-Association , also TW-Hya-Association or TWA for short , is an area of young stars which are about 50 parsecs from Earth and about 8 million years old.
description
The area is named after the star TW Hydrae and it was proposed for the first time by a team led by Joel H. Kastner in 1997.
It is believed that the association has about 30 members, but this is not certain, as the TWA overlaps with the Lower-Centaurus Crux , which is attributed to the Scorpius-Centaurus Association . There is also the theory that TWA is the front part of the Lower Centaurus Crux.
Members
Well-known members of this association are TW Hya, Hen-3 600 , HD 98800 and HR4796A , in which a disk of dust was discovered.
In addition to exist 2M1207 a planetary system with the exoplanets 2M1207b .
In addition to WISEA 1147 , a brown dwarf is also suspected in the TWA 5 system .
Another member is 2MASS 1119-11 , which was identified as the first known double planetary system in 2017 .
Individual evidence
- ↑ Michael L. Sitko, David K. Lynch, Ray W. Russell: Silicate Emission in the TW Hydrae Association . August 1, 2000, arxiv : astro-ph / 0008025 (English).
- ^ Adam Schneider, Carl Melis, Inseok Song: TW Hya Association Membership and New WISE-detected Circumstellar Disks . May 14, 2012, arxiv : 1205.3023 (English).
- ^ Lone Planetary-Mass Object Found in Family of Stars . In: NASA , April 19, 2016. Retrieved April 21, 2016.
- ↑ William MJ Best1, Michael C. Liu, Trent J. Dupuy, Eugene A. Magnier: The Young L Dwarf 2MASS J11193254-1137466 Is a Planetary-mass binary , The Astrophysical Journal Letters, Volume 843, Number 1, The American Astronomical Society , June 23, 2017, accessed July 12, 2017