On the pressure of collisionless particle fluids. The case of solids settling in disks
| hal.structure.identifier | Université Sciences et Technologies - Bordeaux 1 [UB] | |
| hal.structure.identifier | Laboratoire d'Astrophysique de Bordeaux [Pessac] [LAB] | |
| hal.structure.identifier | Laboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux [L3AB] | |
| hal.structure.identifier | Observatoire aquitain des sciences de l'univers [OASU] | |
| dc.contributor.author | HERSANT, F. | |
| dc.date.created | 2009 | |
| dc.date.issued | 2009 | |
| dc.identifier.issn | 0004-6361 | |
| dc.description.abstractEn | Aims. Collections of dust, grains, and planetesimals are often treated as a pressureless fluid. We study the validity of neglecting the pressure of such a fluid by computing it exactly for the case of particles settling in a disk. Methods. We solve a modified collisionless Boltzmann equation for the particles and compute the corresponding moments of the phase space distribution: density, momentum, and pressure. Results. We find that whenever the Stokes number, defined as the ratio of the gas drag timescale to the orbital timescale, is more than 1/2, the particle fluid cannot be considered as pressureless. While we show it only in the simple case of particles settling in a laminar disk, this property is likely to remain true for most flows, including turbulent flows. | |
| dc.language.iso | en | |
| dc.publisher | EDP Sciences | |
| dc.subject.en | Astrophysics | |
| dc.subject.en | Instrumentation and Methods for Astrophysics | |
| dc.title.en | On the pressure of collisionless particle fluids. The case of solids settling in disks | |
| dc.type | Article de revue | |
| dc.identifier.doi | 10.1051/0004-6361/200911865 | |
| dc.subject.hal | Physique [physics]/Astrophysique [astro-ph]/Instrumentation et méthodes pour l'astrophysique [astro-ph.IM] | |
| dc.subject.hal | Planète et Univers [physics]/Astrophysique [astro-ph]/Instrumentation et méthodes pour l'astrophysique [astro-ph.IM] | |
| dc.identifier.arxiv | 0905.0959 | |
| bordeaux.journal | Astronomy and Astrophysics - A&A | |
| bordeaux.page | 385-389 | |
| bordeaux.volume | 502 | |
| bordeaux.issue | 1 | |
| bordeaux.peerReviewed | oui | |
| hal.identifier | hal-00401523 | |
| hal.version | 1 | |
| hal.popular | non | |
| hal.audience | Internationale | |
| hal.origin.link | https://hal.archives-ouvertes.fr//hal-00401523v1 | |
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