When young stars coalesce out of a cloud of molecular hydrogen, a disk of leftover material called a protoplanetary disk surrounds them. This disk is where planets form, and astronomers are getting better at peering into those veiled environments and
published the paper.
"In ten percent of the evolved binary stars with discs we studied, we see a large cavity in the disc,"first author Kluska in a press release."This is an indication that something is floating around there that has collected all matter in the area of the cavity." These disks can only form in certain circumstances and with certain types of stars. It requires post-asymptotic giant stars. Post-AGB stars are cool, luminous stars in a stage of stellar evolution that stars like our Sun go through. The mass range for post-AGB stars is from about 0.8 to 5 solar masses.Post-AGB stars have exhausted their supply of hydrogen. The star's core is mainly inert carbon and oxygen, but its outer layer expands and cools. The star becomes a red giant.
But the star has lost a lot of its mass by shedding it into space. If it has a binary partner, the material doesn't go far. The binary pair will have a center of gravity, and the ejected material will form a circumbinary disk around the center. But the authors of this study say that even if the cavity in the disk is from a planet, that planet might not necessarily be a second-generation planet.
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