Second generation planets

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Second generation planets

Post by Sirius_Alpha on 5th January 2010, 9:18 pm

Second generation planets
http://arxiv.org/abs/1001.0581

Abstract wrote:Planets are typically thought to form in protoplanetary disks left over from protostellar disk of their newly formed host star. However, an additional planetary formation route may exist in old evolved binary systems. In such systems stellar evolution could lead to the formation of symbiotic stars, where mass transferred from the expanding evolved star to its binary companion could form an accretion disk around it. Such a disk could provide the necessary environment for the formation of a second generation of planets in both circumstellar or circumbinary configurations. Pre-existing first generation planets surviving the post-MS evolution of such systems may serve as seeds for, and/or interact with, the second generation planets, possibly forming atypical planetary systems. Second generation planetary systems should be typically found in white dwarf binary systems, and may show various observational signatures. Most notably, second generation planets could form in environment which are inaccessible, or less favorable, for first generation planets. The orbital phase space available for the second generation planets could be forbidden (in terms of the system stability) to first generation planets in the pre-evolved progenitor binaries. In addition planets could form in metal poor environments such as globular clusters and/or in double compact object binaries. Observations of planets in such forbidden or unfavorable regions may serve to uniquely identify their second generation character. Finally, we point out a few observed candidate second generation planetary systems, including PSR B1620-26 (in a globular cluster), Gl 86, HD 27442 and all of the currently observed circumbinary planet candidates. A second generation origin for these systems could naturally explain their unique configurations.

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Re: Second generation planets

Post by Lazarus on 6th January 2010, 2:18 pm

I've had suspicions about Gliese 86b since the announcement of the Mira B second-generation disc. Nice to see some attention given to this idea.

(Also this is interesting in the light of the new Spitzer observations of Epsilon Aurigae)
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Re: Second generation planets

Post by Lazarus on 15th March 2012, 5:02 pm

Wind-accretion disks in wide binaries, second generation protoplanetary disks and accretion onto white dwarfs

More modelling of disc capture from the wind of an evolving star in a binary system.
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Re: Second generation planets

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