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The phenomenon of shape evolution from solar-driven outgassing for analogues of small Kuiper belt objects
Zhao, Y.1,2; Rezac, L.3; Skorov, Y.3; Li, J-Y4
2020-03-01
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN0035-8711
Volume492Issue:4Pages:5152-5166
Abstract

One of the key findings of the Rosetta mission to the Jupiter -family comet 67P/Cht r nov Gerasimenko was its peculiar hi -lobed shape and its apparent Northern/Southern hemispheric dichotomy in large-scale morphology, This has re -ignited scientific discussions on the topic of the origin, evolution and age of the nucleus. In this work, we conduct a general numerical investigation of the role of solar -driven activity on the overall change in shape. Our goal is to isolate and study the influence of key parameters for solar -driven mass loss, and hopefully to obtain a classification of the final shapes, We consider five general classes of three-dimensional objects for various initial conditions of the spin -axis and orbital parameters, propagating them on different orbits to account for solar-driven CO ice sublimation, We also make a detailed study of the coupling between the sublimation curve and orbital parameters (for CO and 1-1,0 ices). Using the idealizations in this study, we aim to remove the ad hoc assumptions on the source distribution, composition and/or chemical inhomogeneities of the activity, as applied in similar studies that focus on explaining a particular feature or observation. Our numerical experiments show that under no conditions can a homogeneous nucleus with solar driven outgassing produce concave morphology on a convex shape. However, pre-existing concavities can he smoothed/removed for the assumed activity. In summary, the combiupling betweenlar distance, eccentricity, the spin -axis and its orientation, as well as the effects on shadowing and self-heating, do induce morphology changes that might not be deducible without numerical simulations,

Keywordcomets: general comets: individual: 67P/Churyumov-Gerasimenko Kuiper belt: general
DOI10.1093/mnras/staa132
WOS KeywordJUPITER FAMILY COMETS ; DYNAMICAL EVOLUTION ; NUCLEUS ; ORIGIN
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000518148000042
PublisherOXFORD UNIV PRESS
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/36193
Collection中国科学院紫金山天文台
Corresponding AuthorZhao, Y.
Affiliation1.Chinese Acad Sci, Purple Mt Observ, Key Lab Planetary Sci, Nanjing 210008, Peoples R China
2.Chinese Acad Sci, CAS Ctr Excellence Comparat Planetol, Beijing, Peoples R China
3.Max Planck Inst Sonnensyst Forsch, Justus von Liebig Weg 3, D-37077 Gottingen, Germany
4.Planetary Sci Inst, 1700 E Ft Lowell Rd, Tucson, AZ 85719 USA
Recommended Citation
GB/T 7714
Zhao, Y.,Rezac, L.,Skorov, Y.,et al. The phenomenon of shape evolution from solar-driven outgassing for analogues of small Kuiper belt objects[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2020,492(4):5152-5166.
APA Zhao, Y.,Rezac, L.,Skorov, Y.,&Li, J-Y.(2020).The phenomenon of shape evolution from solar-driven outgassing for analogues of small Kuiper belt objects.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,492(4),5152-5166.
MLA Zhao, Y.,et al."The phenomenon of shape evolution from solar-driven outgassing for analogues of small Kuiper belt objects".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 492.4(2020):5152-5166.
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