20 Protoplanetary Discs
Wissenschaftler des „Atacama Large Millimeter/submillimeter Array“ (ALMA)-Observatorium in Chile haben die erste hochaufgelöste Bild-Studie von 20 protoplanetaren Scheiben veröffentlicht und ich will das Teil als Poster. Wer bastelt eine Infografik daraus mit Angaben, wann sich diese protoplanetaren Scheiben in Sonnensysteme verwandeln und wann diese wiederum zu Schwarzen Löchern werden? (via MeFi)
The leading models for planet formation hold that planets are born by the gradual accumulation of dust and gas inside a protoplanetary disk, beginning with grains of icy dust that coalesce to form larger and larger rocks, until asteroids, planetesimals, and planets emerge. This hierarchical process should take many millions of years to unfold, suggesting that its impact on protoplanetary disks would be most prevalent in older, more mature systems. Mounting evidence, however, indicates that is not always the case.
ALMA’s early observations of young protoplanetary disks, some only about one million years old, reveal surprisingly well-defined structures, including prominent rings and gaps, which appear to be the hallmarks of planets. Astronomers were initially cautious to ascribe these features to the actions of planets since other natural process could be at play.
“It was surprising to see possible signatures of planet formation in the very first high-resolution images of young disks. It was important to find out whether these were anomalies or if those signatures were common in disks,” said Jane Huang, a graduate student at CfA and a member of the research team.