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Verfasst von:Reißl, Stefan [VerfasserIn]   i
 Nguyen, Philipp [VerfasserIn]   i
 Jordan, Lucas M. [VerfasserIn]   i
 Klessen, Ralf S. [VerfasserIn]   i
Titel:The rotational disruption of porous dust aggregates from ab initio kinematic calculations
Verf.angabe:Stefan Reissl, Philipp Nguyen, Lucas M. Jordan, and Ralf S. Klessen
E-Jahr:2024
Jahr:December 2024
Umfang:17 S.
Illustrationen:Illustrationen
Fussnoten:Online veröffentlicht: 03. Dezember 2024 ; Gesehen am 01.05.2025
Titel Quelle:Enthalten in: Astronomy and astrophysics
Ort Quelle:Les Ulis : EDP Sciences, 1969
Jahr Quelle:2024
Band/Heft Quelle:692(2024), Artikel-ID A60, Seite 1-17
ISSN Quelle:1432-0746
Abstract:Context. The size of dust grains in the interstellar medium follows a distribution where most of the dust mass is made up of smaller grains. However, the redistribution from larger grains towards smaller sizes, especially by means of rotational disruption, is still poorly understood. Aims. We aim to study the dynamics of porous grain aggregates undergoing an accelerated rotation, namely, a spin-up process that rapidly increases the angular velocity of the aggregate. In particular, we aim to determine the deformation of the grains and the maximal angular velocity up to the rotational disruption event by caused by centrifugal forces.Methods. We precalculated the porous grain aggregate by means of ballistic aggregation analogous to the interstellar dust as input for subsequent numerical simulations. We performed three-dimensional (3D) N-body simulations, mimicking the radiative torque spin-up process up to the point where the grain aggregates become rotationally disrupted. Results. Our simulations results are in agreement with theoretical models predicting a characteristic angular velocity, ωdisr, on the order of 10 8 -10 9 rad s−1, where grains become rotationally disrupted. In contrast to theoretical predictions, we show that for large porous grain aggregates (⪆300 nm), the ωdisr values do not strictly decline. Instead, they reach a lower asymptotic value. Hence, such grains can withstand an accelerated rotation more efficiently up to a factor of 10 because the displacement of mass by centrifugal forces and the subsequent mechanical deformation supports the buildup of new connections within the aggregate. Furthermore, we report that the rapid rotation of grains deforms an ensemble with initially 50:50 prolate and oblate shapes, respectively, preferentially into oblate shapes. Finally, we present a best-fit formula to predict the average rotational disruption of an ensemble of porous dust aggregates dependent on the internal grain structure, total number of monomers, and applied material properties.
DOI:doi:10.1051/0004-6361/202346068
URL:Bitte beachten Sie: Dies ist ein Bibliographieeintrag. Ein Volltextzugriff für Mitglieder der Universität besteht hier nur, falls für die entsprechende Zeitschrift/den entsprechenden Sammelband ein Abonnement besteht oder es sich um einen OpenAccess-Titel handelt.

kostenfrei: Volltext: https://doi.org/10.1051/0004-6361/202346068
 kostenfrei: Volltext: https://www.aanda.org/articles/aa/abs/2024/12/aa46068-23/aa46068-23.html
 DOI: https://doi.org/10.1051/0004-6361/202346068
Datenträger:Online-Ressource
Sprache:eng
K10plus-PPN:1924111101
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