Formation Of The Four Terrestrial Planets In The Jupiter-Saturn Chaotic Excitation Scenario: Fundamental Properties And Water Delivery

By Keith Cowing
Status Report
April 23, 2024
Filed under , , , , , , , , , , , ,
Formation Of The Four Terrestrial Planets In The Jupiter-Saturn Chaotic Excitation Scenario: Fundamental Properties And Water Delivery
Planets formed in 37 optimal 4-P systems. Green-, magenta-, cyan- and red-filled symbols indicate the planet analogs of Mercury, Venus, Earth, and Mars, respectively. Error bars indicate variation in heliocentric distance based on the object’s perihelion and aphelion. Large open triangles represent the terrestrial planets of the solar system. — astro-ph.EP

The Jupiter-Saturn chaotic excitation (JSCE) scenario proposes that the protoplanetary disk was dynamically excited and depleted beyond ~1-1.5 au in a few Myr, offering a new and plausible explanation for several observed properties of the inner solar system.

Here, we expanded our previous work by conducting a comprehensive analysis of 37 optimal terrestrial planet systems obtained in the context of the JSCE scenario. Each optimal system harbored exactly four terrestrial planets analogs to Mercury, Venus, Earth, and Mars. We further investigated water delivery, feeding zones, and accretion history for the planet analogs, which allowed us to better constrain the water distribution in the disk.

The main findings of this work are as follows: 1) the formation of four terrestrial planets with orbits and masses similar to those observed in our solar system in most of our sample, as evidenced by the dynamically colder and hotter orbits of Venus-Earth and Mercury-Mars analogs, and the high success rates of similar mutual orbital separations (~40-85%) and mass ratios of the planets (~70-90%) among the 37 systems; and

2) water was delivered to all terrestrial planets during their formation through the accretion of water-bearing disk objects from beyond ~1-1.5 au. The achievement of Earth’s estimated bulk water content required the disk to contain sufficient water mass distributed within those objects initially. This requirement implies that Mercury, Venus, and Mars acquired water similar to the amount on Earth during their formation.

Several of our planet analogs also matched additional constraints, such as the timing of Moon formation by a giant impact, Earth’s late accretion mass and composition, and Mars’s formation timescale.

Patryk Sofia Lykawka, Takashi Ito

Comments: Manuscript accepted for publication in Icarus (pre-proof check version). The article DOI is not yet available
Subjects: Earth and Planetary Astrophysics (astro-ph.EP)
Cite as: arXiv:2404.13826 [astro-ph.EP] (or arXiv:2404.13826v1 [astro-ph.EP] for this version)
Submission history
From: Patryk Sofia Lykawka
[v1] Mon, 22 Apr 2024 01:58:22 UTC (1,488 KB)

Explorers Club Fellow, ex-NASA Space Station Payload manager/space biologist, Away Teams, Journalist, Lapsed climber, Synaesthete, Na’Vi-Jedi-Freman-Buddhist-mix, ASL, Devon Island and Everest Base Camp veteran, (he/him) 🖖🏻