Asymmetry in the number of L4 and L5 Jupiter Trojans driven by jumping Jupiter

Li, Jian1,2; Xia, Zhihong Jeff3; Yoshida, Fumi4,5; Georgakarakos, Nikolaos6,7; Li, Xin8

2023-01-17

10.1051/0004-6361/202244443

ASTRONOMY & ASTROPHYSICS   Impact Factor & Quartile

0004-6361

1432-0746

Context. More than 10 000 Jupiter Trojans have been detected so far. They are moving around the L4 and L5 triangular Lagrangian points of the Sun-Jupiter system and their distributions can provide important clues about the early evolution of the Solar System. Aims. The number asymmetry of the L4 and L5 Jupiter Trojans is a longstanding problem. We aim to test a new mechanism in order to explain this anomalous feature by invoking the jumping-Jupiter scenario. Methods. First, we introduce the orbital evolution of Jupiter caused by the giant planet instability in the early Solar System. In this scenario, Jupiter could undergo an outward migration at a very high speed. We then investigate how such a jump changes the numbers of the L4 (N-4) and L5 (N-5) Trojans. Results. The outward migration of Jupiter can distort the co-orbital orbits near the Lagrangian points, resulting in L4 Trojans being more stable than the L5 ones. We find that this mechanism could potentially explain the unbiased number asymmetry of N-4/N-5 similar to 1.6 for the known Jupiter Trojans. The uncertainties of the system parameters, such as Jupiter's eccentricity and inclination as well as the inclination distribution of Jupiter Trojans, are also taken into account and our results about the L4/L5 asymmetry have been further validated. However, the resonant amplitudes of the simulated Trojans are excited to higher values compared to the current population. A possible solution is that collisions among the Trojans may reduce their resonant amplitudes.

methods miscellaneous - minor planets, asteroids general - planets and satellites individual Jupiter - celestial mechanics planets and satellites dynamical evolution and stability

SCI

English

NI Journal Papers

Others

National Natural Science Foundation of China["11973027","11933001"] ; National Key R&D Program of China["2019YFA0706601","20H04617"]

Astronomy & Astrophysics

Astronomy & Astrophysics

WOS:000917090200004

EDP SCIENCES S A

SPACE SCIENCE

Web of Science

1.Nanjing Univ, Sch Astron & Space Sci, 163 Xianlin Ave, Nanjing 210023, Peoples R China
2.Nanjing Univ, Key Lab Modern Astron & Astrophys, Minist Educ, Nanjing 210023, Peoples R China
3.Northwestern Univ, Dept Math, 2033 Sheridan Rd, Evanston, IL 60208 USA
4.Univ Occupat & Environm Hlth, 1-1 Iseigaoka, Kitakyushu 8078555, Japan
5.Chiba Inst Technol, Planetary Explorat Res Ctr, 2-17-1 Tsudanuma, Narashino, Chiba 2750016, Japan
6.New York Univ Abu Dhabi, POB 129188, Abu Dhabi, U Arab Emirates
7.New York Univ Abu Dhabi, Ctr Astro Particle & Planetary Phys CAP3, POB 129188, Abu Dhabi, U Arab Emirates
8.Southern Univ Sci & Technol China, Dept Stat & Data Sci, 1088 Xueyuan Rd, Shenzhen 518055, Guangdong, Peoples R China

Li, Jian,Xia, Zhihong Jeff,Yoshida, Fumi,et al. Asymmetry in the number of L4 and L5 Jupiter Trojans driven by jumping Jupiter[J]. ASTRONOMY & ASTROPHYSICS,2023,669.

Li, Jian,Xia, Zhihong Jeff,Yoshida, Fumi,Georgakarakos, Nikolaos,&Li, Xin.(2023).Asymmetry in the number of L4 and L5 Jupiter Trojans driven by jumping Jupiter.ASTRONOMY & ASTROPHYSICS,669.

Li, Jian,et al."Asymmetry in the number of L4 and L5 Jupiter Trojans driven by jumping Jupiter".ASTRONOMY & ASTROPHYSICS 669(2023).