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  1. Book ; Online: OSSOS

    Lin, Hsing Wen / Chen, Ying-Tung / Volk, Kathryn / Gladman, Brett / Murray-Clay, Ruth / Alexandersen, Mike / Bannister, Michele T. / Lawler, Samantha M. / Ip, Wing-Huen / Lykawka, Patryk Sofia / Kavelaars, J. J. / Gwyn, Stephen D. J. / Petit, Jean-Marc

    The Eccentricity and Inclination Distributions of the Stable Neptunian Trojans

    2020  

    Abstract: The minor planets on orbits that are dynamically stable in Neptune's 1:1 resonance on Gyr timescales were likely emplaced by Neptune's outward migration. We explore the intrinsic libration amplitude, eccentricity, and inclination distribution of Neptune' ... ...

    Abstract The minor planets on orbits that are dynamically stable in Neptune's 1:1 resonance on Gyr timescales were likely emplaced by Neptune's outward migration. We explore the intrinsic libration amplitude, eccentricity, and inclination distribution of Neptune's stable Trojans, using the detections and survey efficiency of the Outer Solar System Origins Survey (OSSOS) and Pan-STARRS1. We find that the libration amplitude of the stable Neptunian Trojan population can be well modeled as a Rayleigh distribution with a libration amplitude width $\sigma_{A_phi}$ of 15$^\circ$. When taken as a whole, the Neptune Trojan population can be acceptably modeled with a Rayleigh eccentricity distribution of width $\sigma_e$ of 0.045 and a typical sin(i) x Gaussian inclination distribution with a width $\sigma_i$ of 14 +/- 2 degrees. However, these distributions are only marginally acceptable. This is likely because, even after accounting for survey detection biases, the known large Hr < 8 and small Hr >= 8 Neptune Trojans appear to have markedly different eccentricities and inclinations. We propose that like the classical Kuiper belt, the stable intrinsic Neptunian Trojan population have dynamically `hot' and dynamically `cold' components to its eccentricity/inclination distribution, with $\sigma_{e-cold}$ ~ 0.02 / $\sigma_{i-cold}$ ~ 6$^\circ$ and $\sigma_{e-hot}$~ 0.05 / $\sigma_{i-hot}$ ~ 18$^\circ$. In this scenario, the `cold' L4 Neptunian Trojan population lacks the Hr >= 8 members and has 13 +11/-6 `cold' Trojans with Hr < 8. On the other hand, the `hot' L4 Neptunian Trojan population has 136 +57/-48 Trojans with Hr < 10 -- a population 2.4 times greater than that of the L4 Jovian Trojans in the same luminosity range.

    Comment: 15 pages, 7 figures, v3, accepted for publication in Icarus
    Keywords Astrophysics - Earth and Planetary Astrophysics
    Subject code 612
    Publishing date 2020-06-18
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    Full text online

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  2. Book ; Online: Evidence for Color Dichotomy in the Primordial Neptunian Trojan Population

    Lin, Hsing Wen / Gerdes, David W. / Hamilton, Stephanie J. / Adams, Fred C. / Bernstein, Gary M. / Sako, Masao / Bernadinelli, Pedro / Tucker, Douglas / Allam, Sahar / Becker, Juliette C. / Khain, Tali / Markwardt, Larissa / Franson, Kyle / Abbott, T. M. C. / Annis, J. / Avila, S. / Brooks, D. / Rosell, A. Carnero / Kind, M. Carrasco /
    Cunha, C. E. / D'Andrea, C. B. / da Costa, L. N. / De Vicente, J. / Doel, P. / Eifler, T. F. / Flaugher, B. / Garcia-Bellido, J. / Hollowood, D. L. / Honscheid, Klaus / James, D. J. / Kuehn, K. / Kuropatkin, N. / Maia, M. A. G. / Marshall, J. L. / Miquel, R. / Plazas, A. A. / Romer, A. K. / Sanchez, E. / Scarpine, V. / Sevilla-Noarbe, I. / Smith, M. / Smith, R. C. / Soares-Santos, M. / Sobreira, F. / Suchyta, E. / Tarle, G. / Walker, A. R. / Wester, W.

    2018  

    Abstract: In the current model of early Solar System evolution, the stable members of the Jovian and Neptunian Trojan populations were captured into resonance from the leftover reservoir of planetesimals during the outward migration of the giant planets. As a ... ...

    Abstract In the current model of early Solar System evolution, the stable members of the Jovian and Neptunian Trojan populations were captured into resonance from the leftover reservoir of planetesimals during the outward migration of the giant planets. As a result, both Jovian and Neptunian Trojans share a common origin with the primordial disk population, whose other surviving members constitute today's trans-Neptunian object (TNO) populations. The cold classical TNOs are ultra-red, while the dynamically excited "hot" population of TNOs contains a mixture of ultra-red and blue objects. In contrast, Jovian and Neptunian Trojans are observed to be blue. While the absence of ultra-red Jovian Trojans can be readily explained by the sublimation of volatile material from their surfaces due to the high flux of solar radiation at 5AU, the lack of ultra-red Neptunian Trojans presents both a puzzle and a challenge to formation models. In this work we report the discovery by the Dark Energy Survey (DES) of two new dynamically stable L4 Neptunian Trojans,2013 VX30 and 2014 UU240, both with inclinations i >30 degrees, making them the highest-inclination known stable Neptunian Trojans. We have measured the colors of these and three other dynamically stable Neptunian Trojans previously observed by DES, and find that 2013 VX30 is ultra-red, the first such Neptunian Trojan in its class. As such, 2013 VX30 may be a "missing link" between the Trojan and TNO populations. Using a simulation of the DES TNO detection efficiency, we find that there are 162 +/- 73 Trojans with Hr < 10 at the L4 Lagrange point of Neptune. Moreover, the blue-to-red Neptunian Trojan population ratio should be higher than 17:1. Based on this result, we discuss the possible origin of the ultra-red Neptunian Trojan population and its implications for the formation history of Neptunian Trojans.
    Keywords Astrophysics - Earth and Planetary Astrophysics
    Subject code 612
    Publishing date 2018-06-25
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    Full text online

    More links

    Kategorien

    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

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