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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

  • 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

  • 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

  • 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

  • UT code for WoS article

    000432921400001

  • EID of the result in the Scopus database

    2-s2.0-85048217069