Cited by 163Astro and Planetary ScienceStellar, planetary, and galactic studiesSpace Satellite Systems and Control

Origin and Evolution of Short-period Comets

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Nesvorný, David, Vokrouhlický, David, Dones, Luke, Levison, Harold F., Kaib, Nathan, Morbidelli, Alessandro·2017·The Astrophysical Journal

Abstract

Comets are icy objects that orbitally evolve from the trans-Neptunian region into the inner solar system, where they are heated by solar radiation and become active due to the sublimation of water ice. Here we perform simulations in which cometary reservoirs are formed in the early solar system and evolved over 4.5 Gyr. The gravitational effects of Planet 9 (P9) are included in some simulations. Different models are considered for comets to be active, including a simple assumption that comets remain active for perihelion passages with perihelion distance . The orbital distribution and number of active comets produced in our model is compared to observations. The orbital distribution of ecliptic comets (ECs) is well reproduced in models with and without P9. With P9, the inclination distribution of model ECs is wider than the observed one. We find that the known Halley-type comets (HTCs) have a nearly isotropic inclination distribution. The HTCs appear to be an extension of the population of returning Oort-cloud comets (OCCs) to shorter orbital periods. The inclination distribution of model HTCs becomes broader with increasing , but the existing data are not good enough to constrain from orbital fits. is required to obtain a steady-state population of large active HTCs that is consistent with observations. To fit the ratio of the returning-to-new OCCs, by contrast, our model implies that , possibly because the detected long-period comets are smaller and much easier to disrupt than observed HTCs.

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Crossref · 10.3847/1538-4357/aa7cf6

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89 of 89 references verified0 citation errors · 0 not checkable

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  • Galactic tidal accelerations and passing stars are generally weak for orbits with semimajor axes below 1000 au but can play an important role for objects that diffuse outwards to much larger semimajor axes before being scattered back by Neptune.

    “While these effects are generally weak for orbits with a < 1000 au, they can play an important role for objects that diffuse outwards to much larger semimajor axes, before being scattered back to shorter orbital periods by Neptune.”

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Authors
Nesvorný, D., Vokrouhlický, D., Dones, L., Levison, H. F., Kaib, N., & Morbidelli, A.
Affiliations
  • Charles University (CZ)
  • Southwest Research Institute (US)
  • University of Oklahoma (US)
  • Centre National de la Recherche Scientifique (FR)
Venue
The Astrophysical Journal
Published
2017-08-09
Volume
845
Issue
1
Pages
27
ISSN
  • 0004-637X (ISSN-L)
  • 1538-4357
OpenAlex
W2686004880
Cited by
163
References
89
Citations by year
2026: 9 · 2025: 17 · 2024: 24 · 2023: 22 · 2022: 14 · 2021: 21 · 2020: 23 · 2019: 14 · 2018: 17 · 2017: 2
FWCI
8.38
Type
journal article
Language
en
Open access
Locations
  • The Astrophysical Journal (publishedVersion)
  • arXiv (Cornell University) (submittedVersion)
Topics
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astro and Planetary Science
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Stellar, planetary, and galactic studies
  • Physical Sciences › Engineering › Aerospace Engineering › Space Satellite Systems and Control
Keywords
short-period comets, Planet Nine, Halley-type comets, Oort cloud comets, orbital inclination distribution, perihelion distance, cometary activity, early solar system

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