Challenges in Forming Phobos and Deimos Directly from a Splitting of an Ancestral Single Moon
Autor(a) principal: | |
---|---|
Data de Publicação: | 2022 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.3847/PSJ/ac88d2 http://hdl.handle.net/11449/246343 |
Resumo: | The origin and evolution of Martian moons have been intensively debated in recent years. It is proposed that Phobos and Deimos may originate directly from the splitting of an ancestral moon orbiting at around the Martian synchronous orbit. At this hypothetical splitting, the apocenter of the inner moon (presumed as Phobos) and the pericenter of the outer moon (presumed as Deimos) would coincide, in that, their semimajor axes would reside inside and outside the Martian synchronous orbit with nonzero eccentricities, respectively. However, the successive orbital evolution of the two moons is not studied. Here, we perform direct N-body orbital integrations of the moons, including the Martian oblateness of the J2 and J4 terms. We show that the two moons, while they precess, likely collide within ∼104 yr with an impact velocity of vimp ∼ 100-300 m s−1 (∼10-30 times moons’ escape velocity) and with an isotropic impact direction. The impact occurs around the apocenter and the pericenter of the inner and outer moons, respectively, where the timescale of this periodic orbital alignment is regulated by the precession. By performing additional impact simulations, we show that such a high-velocity impact likely results in a disruptive outcome, forming a debris ring at around the Martian synchronous orbit, from which several small moons would accrete. Such an evolutionary path would eventually form a different Martian moon system from the one we see today. Therefore, it seems unlikely that Phobos and Deimos are split directly from a single ancestral moon. |
id |
UNSP_f438c82f41d2c6feba6aae1c2dd1e43b |
---|---|
oai_identifier_str |
oai:repositorio.unesp.br:11449/246343 |
network_acronym_str |
UNSP |
network_name_str |
Repositório Institucional da UNESP |
repository_id_str |
2946 |
spelling |
Challenges in Forming Phobos and Deimos Directly from a Splitting of an Ancestral Single MoonThe origin and evolution of Martian moons have been intensively debated in recent years. It is proposed that Phobos and Deimos may originate directly from the splitting of an ancestral moon orbiting at around the Martian synchronous orbit. At this hypothetical splitting, the apocenter of the inner moon (presumed as Phobos) and the pericenter of the outer moon (presumed as Deimos) would coincide, in that, their semimajor axes would reside inside and outside the Martian synchronous orbit with nonzero eccentricities, respectively. However, the successive orbital evolution of the two moons is not studied. Here, we perform direct N-body orbital integrations of the moons, including the Martian oblateness of the J2 and J4 terms. We show that the two moons, while they precess, likely collide within ∼104 yr with an impact velocity of vimp ∼ 100-300 m s−1 (∼10-30 times moons’ escape velocity) and with an isotropic impact direction. The impact occurs around the apocenter and the pericenter of the inner and outer moons, respectively, where the timescale of this periodic orbital alignment is regulated by the precession. By performing additional impact simulations, we show that such a high-velocity impact likely results in a disruptive outcome, forming a debris ring at around the Martian synchronous orbit, from which several small moons would accrete. Such an evolutionary path would eventually form a different Martian moon system from the one we see today. Therefore, it seems unlikely that Phobos and Deimos are split directly from a single ancestral moon.Japan Society for the Promotion of ScienceISAS/JAXA, KanagawaEarth-Life Science Institute Tokyo Institute of Technology, Meguro-kuUniversité de Paris Institut de Physique du Globe de Paris CNRSGrupo de Dinâmica Orbital & Planetologia São Paulo State University—UNESP, Av. Ariberto Pereira da Cunha 333, SPGrupo de Dinâmica Orbital & Planetologia São Paulo State University—UNESP, Av. Ariberto Pereira da Cunha 333, SPJapan Society for the Promotion of Science: 20KK0080Japan Society for the Promotion of Science: 21H04514Japan Society for the Promotion of Science: JP22K14091ISAS/JAXATokyo Institute of TechnologyCNRSUniversidade Estadual Paulista (UNESP)Hyodo, RyukiGenda, HidenoriSekiguchi, RyosukeMadeira, Gustavo [UNESP]Charnoz, Sébastien2023-07-29T12:38:20Z2023-07-29T12:38:20Z2022-08-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://dx.doi.org/10.3847/PSJ/ac88d2Planetary Science Journal, v. 3, n. 8, 2022.2632-3338http://hdl.handle.net/11449/24634310.3847/PSJ/ac88d22-s2.0-85142251332Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengPlanetary Science Journalinfo:eu-repo/semantics/openAccess2023-07-29T12:38:20Zoai:repositorio.unesp.br:11449/246343Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T16:14:07.356652Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Challenges in Forming Phobos and Deimos Directly from a Splitting of an Ancestral Single Moon |
title |
Challenges in Forming Phobos and Deimos Directly from a Splitting of an Ancestral Single Moon |
spellingShingle |
Challenges in Forming Phobos and Deimos Directly from a Splitting of an Ancestral Single Moon Hyodo, Ryuki |
title_short |
Challenges in Forming Phobos and Deimos Directly from a Splitting of an Ancestral Single Moon |
title_full |
Challenges in Forming Phobos and Deimos Directly from a Splitting of an Ancestral Single Moon |
title_fullStr |
Challenges in Forming Phobos and Deimos Directly from a Splitting of an Ancestral Single Moon |
title_full_unstemmed |
Challenges in Forming Phobos and Deimos Directly from a Splitting of an Ancestral Single Moon |
title_sort |
Challenges in Forming Phobos and Deimos Directly from a Splitting of an Ancestral Single Moon |
author |
Hyodo, Ryuki |
author_facet |
Hyodo, Ryuki Genda, Hidenori Sekiguchi, Ryosuke Madeira, Gustavo [UNESP] Charnoz, Sébastien |
author_role |
author |
author2 |
Genda, Hidenori Sekiguchi, Ryosuke Madeira, Gustavo [UNESP] Charnoz, Sébastien |
author2_role |
author author author author |
dc.contributor.none.fl_str_mv |
ISAS/JAXA Tokyo Institute of Technology CNRS Universidade Estadual Paulista (UNESP) |
dc.contributor.author.fl_str_mv |
Hyodo, Ryuki Genda, Hidenori Sekiguchi, Ryosuke Madeira, Gustavo [UNESP] Charnoz, Sébastien |
description |
The origin and evolution of Martian moons have been intensively debated in recent years. It is proposed that Phobos and Deimos may originate directly from the splitting of an ancestral moon orbiting at around the Martian synchronous orbit. At this hypothetical splitting, the apocenter of the inner moon (presumed as Phobos) and the pericenter of the outer moon (presumed as Deimos) would coincide, in that, their semimajor axes would reside inside and outside the Martian synchronous orbit with nonzero eccentricities, respectively. However, the successive orbital evolution of the two moons is not studied. Here, we perform direct N-body orbital integrations of the moons, including the Martian oblateness of the J2 and J4 terms. We show that the two moons, while they precess, likely collide within ∼104 yr with an impact velocity of vimp ∼ 100-300 m s−1 (∼10-30 times moons’ escape velocity) and with an isotropic impact direction. The impact occurs around the apocenter and the pericenter of the inner and outer moons, respectively, where the timescale of this periodic orbital alignment is regulated by the precession. By performing additional impact simulations, we show that such a high-velocity impact likely results in a disruptive outcome, forming a debris ring at around the Martian synchronous orbit, from which several small moons would accrete. Such an evolutionary path would eventually form a different Martian moon system from the one we see today. Therefore, it seems unlikely that Phobos and Deimos are split directly from a single ancestral moon. |
publishDate |
2022 |
dc.date.none.fl_str_mv |
2022-08-01 2023-07-29T12:38:20Z 2023-07-29T12:38:20Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.3847/PSJ/ac88d2 Planetary Science Journal, v. 3, n. 8, 2022. 2632-3338 http://hdl.handle.net/11449/246343 10.3847/PSJ/ac88d2 2-s2.0-85142251332 |
url |
http://dx.doi.org/10.3847/PSJ/ac88d2 http://hdl.handle.net/11449/246343 |
identifier_str_mv |
Planetary Science Journal, v. 3, n. 8, 2022. 2632-3338 10.3847/PSJ/ac88d2 2-s2.0-85142251332 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Planetary Science Journal |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.source.none.fl_str_mv |
Scopus reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1808128622934884352 |