OSSOS: XI. No active centaurs in the Outer Solar System Origins Survey

Nahuel Cabral*, Aurélie Guilbert-Lepoutre, Wesley C. Fraser, Michaël Marsset, Kathryn Volk, Jean Marc Petit, Philippe Rousselot, Mike Alexandersen, Michele T. Bannister, Ying Tung Chen, Brett Gladman, Stephen D.J. Gwyn, John J. Kavelaars

*Corresponding author for this work

Research output: Contribution to journalArticle

1 Citation (Scopus)
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Abstract

Context. Centaurs are icy objects in transition between the trans-Neptunian region and the inner solar system, orbiting the Sun in the giant planet region. Some centaurs display cometary activity, which cannot be sustained by the sublimation of water ice in this part of the solar system, and has been hypothesized to be due to the crystallization of amorphous water ice. 

Aims. In this work, we investigate centaurs discovered by the Outer Solar System Origins Survey (OSSOS) and search for cometary activity. Tentative detections would improve understanding of the origins of activity among these objects. 

Methods. We search for comae and structures by fitting and subtracting both point spread functions and trailed point-spread functions from the OSSOS images of each centaur. When available, Col-OSSOS images were used to search also for comae. 

Results. No cometary activity is detected in the OSSOS sample. We track the recent orbital evolution of each new centaur to confirm that none would actually be predicted to be active, and we provide size estimates for the objects. 

Conclusions. The addition of 20 OSSOS objects to the population of ∼250 known centaurs is consistent with the currently understood scenario, in which drastic drops in perihelion distance induce changes in the thermal balance prone to trigger cometary activity in the giant planet region.

Original languageEnglish
Article numberA102
Number of pages7
JournalAstronomy and Astrophysics
Volume621
DOIs
Publication statusPublished - 15 Jan 2019

Bibliographical note

7 pages, 6 figures, Accepted for publication in Astronomy and Astrophysics

Keywords

  • Comets: General
  • Kuiper belt: General

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    Cabral, N., Guilbert-Lepoutre, A., Fraser, W. C., Marsset, M., Volk, K., Petit, J. M., Rousselot, P., Alexandersen, M., Bannister, M. T., Chen, Y. T., Gladman, B., Gwyn, S. D. J., & Kavelaars, J. J. (2019). OSSOS: XI. No active centaurs in the Outer Solar System Origins Survey. Astronomy and Astrophysics, 621, [A102]. https://doi.org/10.1051/0004-6361/201834021