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dc.contributor.author Lyra, Wladimir
dc.date.accessioned 2017-10-11T21:49:19Z
dc.date.available 2017-10-11T21:49:19Z
dc.date.issued 2012
dc.identifier.citation Lyra, W. (2012). Eccentric rings in debris disks as a result of linear and nonlinear thermocentrifugal drag instability. AGU Fall Meeting Abstracts, 21. Retrieved from http://adsabs.harvard.edu/abs/2012AGUFM.P21B1842L en_US
dc.identifier.uri http://hdl.handle.net/10211.3/197067
dc.description.abstract Debris disks should not be completely gas-free, since there is second generation gas from outgassing of planetesimals and dust grains via sublimation, photodesorption, or collisions, generating a system of dust-to-gas ratio close to unity, where hydrodynamics cannot be ignored. A clumping instability exists in this configuration, that has been hitherto explored only in incompressible models. We expand the linear analysis to include compressiblity, demonstrating the existence of linear instabilities and overstabilities in the system. We show in 2D numerical compressible models that the backreaction of the drag force from the gas onto the dust shepherds rings, similar to those observed in debris disks and usually attributed to the presence of hypothetical undetected planets. We also uncover that the eccentricity of these rings, usually presented as convincing evidence for the presence of a planet, can actually be simply explained by a standing wave propagating along the ring. The rings support a spectrum of oscillations, with one particular mode representing epicyclic motion. The apparent eccentricity matches the eccentricity in observed systems. This suggests that the planet possibility, though thrilling, is not necessarily required to explain these systems. en_US
dc.language.iso en en_US
dc.publisher AGU Fall Meeting Abstracts en_US
dc.relation.uri http://adsabs.harvard.edu/abs/2012AGUFM.P21B1842L en_US
dc.subject debris disk en_US
dc.subject hydrodynamics en_US
dc.subject linear analysis en_US
dc.subject astronomy en_US
dc.subject astrophysics en_US
dc.title Eccentric rings in debris disks as a result of linear and nonlinear thermocentrifugal drag instability en_US
dc.type conference paper en_US


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