Col-OSSOS: z-Band Photometry Reveals Three Distinct TNO Surface Types

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dc.contributor.author Pike, Rosemary E.
dc.contributor.author Fraser, Wesley C.
dc.contributor.author Schwamb, Megan E.
dc.contributor.author Kavelaars, J. J.
dc.contributor.author Marsset, Michael
dc.contributor.author Bannister, Michele T.
dc.contributor.author Lehner, Matthew J.
dc.contributor.author Wang, Shiang-Yu
dc.contributor.author Alexandersen, Mike
dc.contributor.author Chen, Ying-Tung
dc.contributor.author Gladman, Brett J.
dc.contributor.author Gwyn, Stephen
dc.contributor.author Petit, Jean-Marc
dc.contributor.author Volk, Kathryn
dc.date.accessioned 2019-01-10T20:47:28Z
dc.date.available 2019-01-10T20:47:28Z
dc.date.copyright 2017 en_US
dc.date.issued 2017
dc.identifier.citation Pike, R. E.; Fraser, W. C.; Schwamb, M. E.; Kavelaars, J. J.; Marsset, M.; Bannister, M. T.; … & Volk, K. (2017). Col-OSSOS: z-Band photometry reveals three distinct TNO surface types. The Astronomical Journal, 154(3), article 101. https://doi.org/10.3847/1538-3881/aa83b1 en_US
dc.identifier.uri https://doi.org/10.3847/1538-3881/aa83b1
dc.identifier.uri https://dspace.library.uvic.ca//handle/1828/10507
dc.description.abstract Several different classes of trans-Neptunian objects (TNOs) have been identified based on their optical and near-infrared colors. As part of the Colours of the Outer Solar System Origins Survey (Col-OSSOS), we have obtained g-, r-, and z-band photometry of 26 TNOs using Subaru and Gemini Observatories. Previous color surveys have not utilized z-band reflectance, and the inclusion of this band reveals significant surface reflectance variations between sub-populations. The colors of TNOs in g − r and r − z show obvious structure, and appear consistent with the previously measured bi-modality in g − r. The distribution of colors of the two dynamically excited surface types can be modeled using the two-component mixing models from Fraser & Brown. With the combination of g − r and r − z, the dynamically excited classes can be separated cleanly into red and neutral surface classes. In g − r and r − z, the two dynamically excited surface groups are also clearly distinct from the cold classical TNO surfaces, which are red, with $g-r\gtrsim 0.85$ and r − z lesssim 0.6, while all dynamically excited objects with similar g − r colors exhibit redder r − z colors. The z-band photometry makes it possible for the first time to differentiate the red excited TNO surfaces from the red cold classical TNO surfaces. The discovery of different r − z colors for these cold classical TNOs makes it possible to search for cold classical surfaces in other regions of the Kuiper Belt and to completely separate cold classical TNOs from the dynamically excited population, which overlaps in orbital parameter space. en_US
dc.description.sponsorship This research was based on observations obtained at the Gemini Observatory, acquired through the Gemini Observatory Archive, and processed using the Gemini IRAF package, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the National Research Council (Canada), CONICYT (Chile), Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina), and Ministério da Ciência, Tecnologia e Inovação (Brazil). This research was also based on data collected at Subaru Telescope, which is operated by the National Astronomical Observatory of Japan. The authors recognize and acknowledge the very significant cultural role and reverence that the summit of Maunakea has always had within the indigenous Hawaiian community. We are fortunate to have the opportunity to conduct observations from this mountain. M.B. acknowledges support from UK STFC grant ST/L000709/1. M.E.S. was supported by Gemini Observatory. en_US
dc.language.iso en en_US
dc.publisher The Astronomical Journal en_US
dc.subject Kuniper belt en_US
dc.subject general en_US
dc.title Col-OSSOS: z-Band Photometry Reveals Three Distinct TNO Surface Types en_US
dc.type Article en_US
dc.description.scholarlevel Faculty en_US
dc.description.reviewstatus Reviewed en_US

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