Bi-lobed Shape of Comet 67P from a Collapsed Binary
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F18%3A10391402" target="_blank" >RIV/00216208:11320/18:10391402 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.3847/1538-3881/aac01f" target="_blank" >https://doi.org/10.3847/1538-3881/aac01f</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.3847/1538-3881/aac01f" target="_blank" >10.3847/1538-3881/aac01f</a>
Alternative languages
Result language
angličtina
Original language name
Bi-lobed Shape of Comet 67P from a Collapsed Binary
Original language description
The Rosetta spacecraft observations revealed that the nucleus of comet 67P/Churyumov-Gerasimenko consists of two similarly sized lobes connected by a narrow neck. Here, we evaluate the possibility that 67P is a collapsed binary. We assume that the progenitor of 67P was a binary and consider various physical mechanisms that could have brought the binary components together, including small-scale impacts and gravitational encounters with planets. We find that 67P could be a primordial body (i.e., not a collisional fragment) if the outer planetesimal disk lasted less than or similar to 10 Myr before it was dispersed by migrating Neptune. The probability of binary collapse by impact is similar or equal to 30% for tightly bound binaries. Most km-class binaries become collisionally dissolved. Roughly 10% of the surviving binaries later evolve to become contact binaries during the disk dispersal, when bodies suffer gravitational encounters with Neptune. Overall, the processes described in this work do not seem to be efficient enough to explain the large fraction (similar to 67%) of bi-lobed cometary nuclei inferred from spacecraft imaging.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10308 - Astronomy (including astrophysics,space science)
Result continuities
Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2018
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
The Astronomical Journal
ISSN
0004-6256
e-ISSN
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Volume of the periodical
155
Issue of the periodical within the volume
6
Country of publishing house
US - UNITED STATES
Number of pages
10
Pages from-to
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UT code for WoS article
000432921400001
EID of the result in the Scopus database
2-s2.0-85048217069