View Full Version : Dusty Disk Evidence of Planetary Collision

2008-Sep-24, 01:50 PM
What astronomers had expected to be a run-of-the-mill protoplanetary disk turned out to be evidence of a much more intriguing story. While observing the sun-like star BD 20 307, a team of astronomers noticed a large disk of dust surrounding the star. Usually, this is evidence of planetary formation around younger stars. The 8 planets [...]

More... (http://www.universetoday.com/2008/09/24/dusty-disk-evidence-of-planetary-collision/)

2008-Sep-24, 07:05 PM
http://arxiv.org/PS_cache/arxiv/pdf/0804/0804.1799v2.pdf provides more detail and argues for the expected circum-binary location of the disk. The system would have a much more dynamic barycenter than a single star-planets system. Could this have affected the breakup of a planet absent a collider? Could the Li difference be due to different origins for the individual stars thus making assigning a common age to both of them a stretch and allowing a reasonable conjecture about the disk resulting from the capture process. If Li is the main predicter of age and the stars are from a common origin, how does one arrive at which Li value is the primary determinant?