THE ALBEDO-COLOR DIVERSITY OF TRANSNEPTUNIAN OBJECTS

Lacerda, Pedro and Fornasier, Sonia and Lellouch, Emmanuel and Kiss, Csaba and Vilenius, Esa and Santos-Sanz, Pablo and Rengel, Miriam and Müller, Thomas and Stansberry, John and Duffard, René and Delsanti, Audrey and Guilbert-Lepoutre, Aurélie (2014) THE ALBEDO-COLOR DIVERSITY OF TRANSNEPTUNIAN OBJECTS. The Astrophysical Journal, 793 (1). L2. ISSN 2041-8205

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Abstract

We analyze albedo data obtained using the Herschel Space Observatory that reveal the existence of two distinct types of surface among midsized trans-Neptunian objects. A color-albedo diagram shows two large clusters of objects, one redder and higher albedo and another darker and more neutrally colored. Crucially, all objects in our sample located in dynamically stable orbits within the classical Kuiper Belt region and beyond are confined to the bright red group, implying a compositional link. Those objects are believed to have formed further from the Sun than the dark neutral bodies. This color-albedo separation is evidence for a compositional discontinuity in the young solar system.

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