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Evidence for color dichotomy in the primordial Neptunian Trojan population Article uri icon

Authors

  • 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., Carnero Rosell, A., Carrasco Kind, M., Cunha, C. E., D'Andrea, C. B., da Costa, L. N., De Vicente, J., Doel, P., Eifler, T. F., et al

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 (low inclination and small eccentricity) classical TNOs are ultra-red, while the dynamically excited "hot" (high inclination and larger eccentricity) 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 5 AU, 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

published in

publication date

  • 2019