Formation of bi-lobed shapes by sub-catastrophic collisions

Jutzi, Martin; Benz, Willy (2017). Formation of bi-lobed shapes by sub-catastrophic collisions. Astronomy and astrophysics, 597(A62), A62. EDP Sciences 10.1051/0004-6361/201628964

[img] Text
aa28964-16.pdf - Published Version
Restricted to registered users only
Available under License Publisher holds Copyright.

Download (2MB) | Request a copy
[img]
Preview
Text
jutzi_and_benz_final_corrected.pdf - Accepted Version
Available under License Publisher holds Copyright.

Download (2MB) | Preview

Context. The origin of the particular shape of comet 67P/Churyumov-Gerasimenko (67P) is a topic of active research. How and when it acquired its peculiar characteristics has distinct implications on the origin of the solar system and its dynamics. Aims. We investigate how shapes such as that of comet 67P can result from a new type of low-energy, sub-catastrophic impact involving elongated, rotating bodies. We focus on parameters potentially leading to bi-lobed structures. We also estimate the probability of such structures surviving subsequent impacts. Methods. We used a smooth particle hydrodynamics (SPH) shock physics code to model the impacts, the subsequent re-accumulation of material and the reconfiguration into a stable final shape. The energy increase as well as the degree of compaction of the resulting bodies were tracked in the simulations. Results. Our modelling results suggest that the formation of bi-lobed structures like 67P is a natural outcome of the low-energy, sub-catastrophic collisions considered here. Conclusions. Sub-catastrophic impacts have the potential to alter the shape of a small body significantly, without leading to major heating or compaction. The currently observed shapes of cometary nuclei, such as 67P, may be a result of such a major shape forming impact.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Physics Institute > Space Research and Planetary Sciences > Theoretical Astrophysics and Planetary Science (TAPS)
08 Faculty of Science > Physics Institute > Space Research and Planetary Sciences
08 Faculty of Science > Physics Institute
08 Faculty of Science > Physics Institute > NCCR PlanetS

UniBE Contributor:

Jutzi, Martin and Benz, Willy

Subjects:

500 Science > 520 Astronomy
600 Technology > 620 Engineering
500 Science > 530 Physics

ISSN:

0004-6361

Publisher:

EDP Sciences

Language:

English

Submitter:

Janine Jungo

Date Deposited:

19 Jul 2017 07:45

Last Modified:

12 Mar 2018 11:54

Publisher DOI:

10.1051/0004-6361/201628964

BORIS DOI:

10.7892/boris.97228

URI:

https://boris.unibe.ch/id/eprint/97228

Actions (login required)

Edit item Edit item
Provide Feedback