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Title: CAPTURE OF TROJANS BY JUMPING JUPITER

Abstract

Jupiter Trojans are thought to be survivors of a much larger population of planetesimals that existed in the planetary region when planets formed. They can provide important constraints on the mass and properties of the planetesimal disk, and its dispersal during planet migration. Here, we tested a possibility that the Trojans were captured during the early dynamical instability among the outer planets (aka the Nice model), when the semimajor axis of Jupiter was changing as a result of scattering encounters with an ice giant. The capture occurs in this model when Jupiter's orbit and its Lagrange points become radially displaced in a scattering event and fall into a region populated by planetesimals (that previously evolved from their natal transplanetary disk to {approx}5 AU during the instability). Our numerical simulations of the new capture model, hereafter jump capture, satisfactorily reproduce the orbital distribution of the Trojans and their total mass. The jump capture is potentially capable of explaining the observed asymmetry in the number of leading and trailing Trojans. We find that the capture probability is (6-8) Multiplication-Sign 10{sup -7} for each particle in the original transplanetary disk, implying that the disk contained (3-4) Multiplication-Sign 10{sup 7} planetesimals with absolute magnitudemore » H < 9 (corresponding to diameter D = 80 km for a 7% albedo). The disk mass inferred from this work, M{sub disk} {approx} 14-28 M{sub Earth}, is consistent with the mass deduced from recent dynamical simulations of the planetary instability.« less

Authors:
 [1];  [2];  [3]
  1. Department of Space Studies, Southwest Research Institute, 1050 Walnut St., Suite 300, Boulder, CO 80302 (United States)
  2. Institute of Astronomy, Charles University, V Holesovickach 2, 180 00 Prague 8 (Czech Republic)
  3. Departement Cassiopee, University of Nice, CNRS, Observatoire de la Cote d'Azur, Nice, F-06304 (France)
Publication Date:
OSTI Identifier:
22126835
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 768; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ASTEROIDS; CAPTURE; COMPUTERIZED SIMULATION; DISTRIBUTION; INSTABILITY; JUPITER PLANET; MASS; MIGRATION; ORBITS; PARTICLES; PROBABILITY; SATELLITES; SCATTERING

Citation Formats

Nesvorny, David, Vokrouhlicky, David, and Morbidelli, Alessandro. CAPTURE OF TROJANS BY JUMPING JUPITER. United States: N. p., 2013. Web. doi:10.1088/0004-637X/768/1/45.
Nesvorny, David, Vokrouhlicky, David, & Morbidelli, Alessandro. CAPTURE OF TROJANS BY JUMPING JUPITER. United States. https://doi.org/10.1088/0004-637X/768/1/45
Nesvorny, David, Vokrouhlicky, David, and Morbidelli, Alessandro. Wed . "CAPTURE OF TROJANS BY JUMPING JUPITER". United States. https://doi.org/10.1088/0004-637X/768/1/45.
@article{osti_22126835,
title = {CAPTURE OF TROJANS BY JUMPING JUPITER},
author = {Nesvorny, David and Vokrouhlicky, David and Morbidelli, Alessandro},
abstractNote = {Jupiter Trojans are thought to be survivors of a much larger population of planetesimals that existed in the planetary region when planets formed. They can provide important constraints on the mass and properties of the planetesimal disk, and its dispersal during planet migration. Here, we tested a possibility that the Trojans were captured during the early dynamical instability among the outer planets (aka the Nice model), when the semimajor axis of Jupiter was changing as a result of scattering encounters with an ice giant. The capture occurs in this model when Jupiter's orbit and its Lagrange points become radially displaced in a scattering event and fall into a region populated by planetesimals (that previously evolved from their natal transplanetary disk to {approx}5 AU during the instability). Our numerical simulations of the new capture model, hereafter jump capture, satisfactorily reproduce the orbital distribution of the Trojans and their total mass. The jump capture is potentially capable of explaining the observed asymmetry in the number of leading and trailing Trojans. We find that the capture probability is (6-8) Multiplication-Sign 10{sup -7} for each particle in the original transplanetary disk, implying that the disk contained (3-4) Multiplication-Sign 10{sup 7} planetesimals with absolute magnitude H < 9 (corresponding to diameter D = 80 km for a 7% albedo). The disk mass inferred from this work, M{sub disk} {approx} 14-28 M{sub Earth}, is consistent with the mass deduced from recent dynamical simulations of the planetary instability.},
doi = {10.1088/0004-637X/768/1/45},
url = {https://www.osti.gov/biblio/22126835}, journal = {Astrophysical Journal},
issn = {0004-637X},
number = 1,
volume = 768,
place = {United States},
year = {2013},
month = {5}
}