Bi-lobed Shape of Comet 67P from a Collapsed Binary

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

Bi-lobed Shape of Comet 67P from a Collapsed Binary

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

Bi-lobed Shape of Comet 67P from a Collapsed Binary

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2018

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

The Astronomical Journal

ISSN

0004-6256

e-ISSN

—

Svazek periodika

155

Číslo periodika v rámci svazku

6

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

10

Strana od-do

—

Kód UT WoS článku

000432921400001

EID výsledku v databázi Scopus

2-s2.0-85048217069