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Influence of the Yarkovsky force on Jupiter Trojan asteroids

Hellmich, Stephan and Mottola, Stefano and Hahn, G. and Kührt, Ekkehard and Niem, Detlef (2019) Influence of the Yarkovsky force on Jupiter Trojan asteroids. Astronomy and Astrophysics, 630, A148. EDP Sciences. DOI: 10.1051/0004-6361/201834715 ISSN 0004-6361

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Official URL: https://www.aanda.org/articles/aa/abs/2019/10/aa34715-18/aa34715-18.html


Aims. We investigate the influence of the Yarkovsky force on the long-term orbital evolution of Jupiter Trojan asteroids. Methods. Clones of the observed population with different sizes and different thermal properties were numerically integrated for 1 Gyr with and without the Yarkovsky effect. The escape rate of these objects from the Trojan region as well as changes in the libration amplitude, eccentricity, and inclination were used as a metric of the strength of the Yarkovsky effect on the Trojan orbits. Results. Objects with radii R≤1 km are significantly influenced by the Yarkovsky force. The effect causes a depletion of these objects over timescales of a few hundred million years. As a consequence, we expect the size-frequency distribution of small Trojans to show a shallower slope than that of the currently observable population (R ≳ 1 km), with a turning point between R = 100 m and R = 1 km. The effect of the Yarkovsky acceleration on the orbits of Trojans depends on the sense of rotation in a complex way. The libration amplitude of prograde rotators decreases with time while the eccentricity increases. Retrograde rotators experience the opposite effect, which results in retrograde rotators being ejected faster from the 1:1 resonance region. Furthermore, for objects affected by the Yarkovsky force, we find indications that the effect tends to smooth out the differences in the orbital distribution between the two clouds.

Item URL in elib:https://elib.dlr.de/129251/
Document Type:Article
Title:Influence of the Yarkovsky force on Jupiter Trojan asteroids
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Hellmich, StephanStephan.Hellmich (at) dlr.deUNSPECIFIED
Mottola, StefanoStefano.Mottola (at) dlr.deUNSPECIFIED
Hahn, G.gerhard.hahn (at) dlr.deUNSPECIFIED
Kührt, EkkehardEkkehard.Kuehrt (at) dlr.deUNSPECIFIED
Niem, DetlefDetlef.deNiem (at) dlr.deUNSPECIFIED
Journal or Publication Title:Astronomy and Astrophysics
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1051/0004-6361/201834715
Page Range:A148
Publisher:EDP Sciences
Keywords:Jupiter Trojan Asteroids, Yarkovsky effect, Numerical integration
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Science and Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Erforschung des Weltraums
DLR - Research theme (Project):R - Vorhaben Exploration des Sonnensystems
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Asteroids and Comets
Deposited By: Hellmich, Stephan
Deposited On:21 Oct 2019 08:07
Last Modified:21 Oct 2019 08:07

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