Impacts into rotating targets: angular momentum draining and efficient formation of synthetic families
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F19%3A10405862" target="_blank" >RIV/00216208:11320/19:10405862 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=DtVzKKb~IC" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=DtVzKKb~IC</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1051/0004-6361/201935690" target="_blank" >10.1051/0004-6361/201935690</a>
Alternative languages
Result language
angličtina
Original language name
Impacts into rotating targets: angular momentum draining and efficient formation of synthetic families
Original language description
About 10% of the observed asteroids have rotational periods lower than P = 3 h and seem to be relatively close to the spin barrier. Yet, the rotation has often been neglected in simulations of asteroid collisions. To determine the effect of rotation, we performed a large number of impact simulations with rotating targets. We developed a new unified smoothed particle hydrodynamics and N-body code with self-gravity, suitable for simulations of both fragmentation phase and gravitational reaccumulation. The code has been verified against previous ones, but we also tested new features, such as rotational stability, tensile stability, etc. Using the new code, we ran simulations with D-pb = 10 and 100 km monolithic targets and compared synthetic asteroid families created by these impacts with families corresponding to non-rotating targets. The rotation affects mostly cratering events at oblique impact angles. The total mass ejected by these collisions can be up to five times larger for rotating targets. We further computed the transfer of the angular momentum and determined conditions under which impacts accelerate or decelerate the target. While individual cratering collisions can cause both acceleration and deceleration, the deceleration prevails on average. Collisions thus cause a systematic spin-down of the asteroid population.
Czech name
—
Czech description
—
Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
10308 - Astronomy (including astrophysics,space science)
Result continuities
Project
<a href="/en/project/GC18-04514J" target="_blank" >GC18-04514J: On the edge of disruption - physical properties of fast-rotating multi-kilometer asteroids</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2019
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Astronomy & Astrophysics [online]
ISSN
1432-0746
e-ISSN
—
Volume of the periodical
629
Issue of the periodical within the volume
září
Country of publishing house
FR - FRANCE
Number of pages
12
Pages from-to
A122
UT code for WoS article
000486137600002
EID of the result in the Scopus database
—