On the Impact Origin of Phobos and Deimos. II. True Polar Wander and Disk Evolution
International audience Phobos and Deimos are the two small Martian moons, orbiting almost on the equatorial plane of Mars. Recent works have shown that they can accrete within an impact-generated inner dense and outer light disk, and that the same impact potentially forms the Borealis basin, a large...
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Online Access: | https://insu.hal.science/insu-02914694 https://doi.org/10.3847/1538-4357/aa9984 |
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ftinsu:oai:HAL:insu-02914694v1 2024-02-11T10:06:57+01:00 On the Impact Origin of Phobos and Deimos. II. True Polar Wander and Disk Evolution Hyodo, Ryuki Rosenblatt, Pascal Genda, Hidenori Charnoz, Sébastien Institut de Physique du Globe de Paris (IPGP) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS) Earth-Life Science Institute Tokyo (ELSI) Tokyo Institute of Technology Tokyo (TITECH) Royal Observatory of Belgium Brussels (ROB) Analytic and Computational Research, Inc. - Earth Sciences (ACRI-ST) Institut de Physique du Globe de Paris (IPGP (UMR_7154)) Institut national des sciences de l'Univers (INSU - CNRS)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité) ANR-10-LABX-0023,UnivEarthS,Earth - Planets - Universe: observation, modeling, transfer(2010) ANR-11-IDEX-0005,USPC,Université Sorbonne Paris Cité(2011) 2017-12-19 https://insu.hal.science/insu-02914694 https://doi.org/10.3847/1538-4357/aa9984 en eng HAL CCSD American Astronomical Society info:eu-repo/semantics/altIdentifier/doi/10.3847/1538-4357/aa9984 insu-02914694 https://insu.hal.science/insu-02914694 doi:10.3847/1538-4357/aa9984 ISSN: 0004-637X EISSN: 1538-4357 The Astrophysical Journal https://insu.hal.science/insu-02914694 The Astrophysical Journal, 2017, 851 (2), pp.122. ⟨10.3847/1538-4357/aa9984⟩ planets and satellites: composition planets and satellites: formation planets and satellites: individual (Phobos Deimos) [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2017 ftinsu https://doi.org/10.3847/1538-4357/aa9984 2024-01-17T17:27:48Z International audience Phobos and Deimos are the two small Martian moons, orbiting almost on the equatorial plane of Mars. Recent works have shown that they can accrete within an impact-generated inner dense and outer light disk, and that the same impact potentially forms the Borealis basin, a large northern hemisphere basin on the current Mars. However, there is no a priori reason for the impact to take place close to the north pole (Borealis present location), nor to generate a debris disk in the equatorial plane of Mars (in which Phobos and Deimos orbit). In this paper, we investigate these remaining issues on the giant impact origin of the Martian moons. First, we show that the mass deficit created by the Borealis impact basin induces a global reorientation of the planet to realign its main moment of inertia with the rotation pole (True Polar Wander). This moves the location of the Borealis basin toward its current location. Next, using analytical arguments, we investigate the detailed dynamical evolution of the eccentric inclined disk from the equatorial plane of Mars that is formed by the Martian-moon-forming impact. We find that, as a result of precession of disk particles due to the Martian dynamical flattening J(2) term of its gravity field and particle-particle inelastic collisions, eccentricity and inclination are damped and an inner dense and outer light equatorial circular disk is eventually formed. Our results strengthen the giant impact origin of Phobos and Deimos that can finally be tested by a future sample return mission such as JAXA's Martian Moons eXploration mission. Article in Journal/Newspaper North Pole Institut national des sciences de l'Univers: HAL-INSU North Pole The Astrophysical Journal 851 2 122 |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
planets and satellites: composition planets and satellites: formation planets and satellites: individual (Phobos Deimos) [SDU]Sciences of the Universe [physics] |
spellingShingle |
planets and satellites: composition planets and satellites: formation planets and satellites: individual (Phobos Deimos) [SDU]Sciences of the Universe [physics] Hyodo, Ryuki Rosenblatt, Pascal Genda, Hidenori Charnoz, Sébastien On the Impact Origin of Phobos and Deimos. II. True Polar Wander and Disk Evolution |
topic_facet |
planets and satellites: composition planets and satellites: formation planets and satellites: individual (Phobos Deimos) [SDU]Sciences of the Universe [physics] |
description |
International audience Phobos and Deimos are the two small Martian moons, orbiting almost on the equatorial plane of Mars. Recent works have shown that they can accrete within an impact-generated inner dense and outer light disk, and that the same impact potentially forms the Borealis basin, a large northern hemisphere basin on the current Mars. However, there is no a priori reason for the impact to take place close to the north pole (Borealis present location), nor to generate a debris disk in the equatorial plane of Mars (in which Phobos and Deimos orbit). In this paper, we investigate these remaining issues on the giant impact origin of the Martian moons. First, we show that the mass deficit created by the Borealis impact basin induces a global reorientation of the planet to realign its main moment of inertia with the rotation pole (True Polar Wander). This moves the location of the Borealis basin toward its current location. Next, using analytical arguments, we investigate the detailed dynamical evolution of the eccentric inclined disk from the equatorial plane of Mars that is formed by the Martian-moon-forming impact. We find that, as a result of precession of disk particles due to the Martian dynamical flattening J(2) term of its gravity field and particle-particle inelastic collisions, eccentricity and inclination are damped and an inner dense and outer light equatorial circular disk is eventually formed. Our results strengthen the giant impact origin of Phobos and Deimos that can finally be tested by a future sample return mission such as JAXA's Martian Moons eXploration mission. |
author2 |
Institut de Physique du Globe de Paris (IPGP) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS) Earth-Life Science Institute Tokyo (ELSI) Tokyo Institute of Technology Tokyo (TITECH) Royal Observatory of Belgium Brussels (ROB) Analytic and Computational Research, Inc. - Earth Sciences (ACRI-ST) Institut de Physique du Globe de Paris (IPGP (UMR_7154)) Institut national des sciences de l'Univers (INSU - CNRS)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité) ANR-10-LABX-0023,UnivEarthS,Earth - Planets - Universe: observation, modeling, transfer(2010) ANR-11-IDEX-0005,USPC,Université Sorbonne Paris Cité(2011) |
format |
Article in Journal/Newspaper |
author |
Hyodo, Ryuki Rosenblatt, Pascal Genda, Hidenori Charnoz, Sébastien |
author_facet |
Hyodo, Ryuki Rosenblatt, Pascal Genda, Hidenori Charnoz, Sébastien |
author_sort |
Hyodo, Ryuki |
title |
On the Impact Origin of Phobos and Deimos. II. True Polar Wander and Disk Evolution |
title_short |
On the Impact Origin of Phobos and Deimos. II. True Polar Wander and Disk Evolution |
title_full |
On the Impact Origin of Phobos and Deimos. II. True Polar Wander and Disk Evolution |
title_fullStr |
On the Impact Origin of Phobos and Deimos. II. True Polar Wander and Disk Evolution |
title_full_unstemmed |
On the Impact Origin of Phobos and Deimos. II. True Polar Wander and Disk Evolution |
title_sort |
on the impact origin of phobos and deimos. ii. true polar wander and disk evolution |
publisher |
HAL CCSD |
publishDate |
2017 |
url |
https://insu.hal.science/insu-02914694 https://doi.org/10.3847/1538-4357/aa9984 |
geographic |
North Pole |
geographic_facet |
North Pole |
genre |
North Pole |
genre_facet |
North Pole |
op_source |
ISSN: 0004-637X EISSN: 1538-4357 The Astrophysical Journal https://insu.hal.science/insu-02914694 The Astrophysical Journal, 2017, 851 (2), pp.122. ⟨10.3847/1538-4357/aa9984⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.3847/1538-4357/aa9984 insu-02914694 https://insu.hal.science/insu-02914694 doi:10.3847/1538-4357/aa9984 |
op_doi |
https://doi.org/10.3847/1538-4357/aa9984 |
container_title |
The Astrophysical Journal |
container_volume |
851 |
container_issue |
2 |
container_start_page |
122 |
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1790604984992137216 |