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“TNOs are Cool”: A survey of the trans-Neptunian region. IV. Size/albedo characterization of 15 scattered disk and detached objects observed with Herschel-PACS

Santos-Sanz, P. and Lellouch, E. and Fornasier, S. and Kiss, C. and Pal, A. and Müller, T. G. and Vilenius, E. and Stansberry, J. and Mommert, M. and Delsanti, A. and Mueller, M. and Peixinho, N. and Henry, F. and Ortiz, J. L. and Thirouin, A. and Protopapa, S. and Duffard, R. and Szalai, N. and Lim, T. and Ejeta, C. and Hartogh, P. and Harris, A. W. and Rengel, M. (2012) “TNOs are Cool”: A survey of the trans-Neptunian region. IV. Size/albedo characterization of 15 scattered disk and detached objects observed with Herschel-PACS. Astronomy and Astrophysics, 541, A92. DOI: 10.1051/0004-6361/201118541. ISSN 0004-6361.

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Official URL: http://dx.doi.org/10.1051/0004-6361/201118541


Context. Physical characterization of trans-Neptunian objects, a primitive population of the outer solar system, may provide constraints on their formation and evolution. Aims: The goal of this work is to characterize a set of 15 scattered disk (SDOs) and detached objects, in terms of their size, albedo, and thermal properties. Methods: Thermal flux measurements obtained with the Herschel-PACS instrument at 70, 100 and 160 μm, and whenever applicable, with Spitzer-MIPS at 24 and 70 μm, are modeled with radiometric techniques, in order to derive the objects' individual size, albedo and when possible beaming factor. Error bars are obtained from a Monte-Carlo approach. We look for correlations between these and other physical and orbital parameters. Results: Diameters obtained for our sample range from 100 to 2400 km, and the geometric albedos (in V band) vary from 3.8% to 84.5%. The unweighted mean V geometric albedo for the whole sample is 11.2% (excluding Eris); 6.9% for the SDOs, and 17.0% for the detached objects (excluding Eris). We obtain new bulk densities for three binary systems: Ceto/Phorcys, Typhon/Echidna and Eris/Dysnomia. Apart from correlations clearly due to observational bias, we find significant correlations between albedo and diameter (more reflective objects being bigger), and between albedo, diameter and perihelion distance (brighter and bigger objects having larger perihelia). We discuss possible explanations for these correlations. Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA. PACS: The Photodetector Array Camera and Spectrometer is one of Herschel's instruments.Appendices are available in electronic form at http://www.aanda.org

Document Type:Article
Title:“TNOs are Cool”: A survey of the trans-Neptunian region. IV. Size/albedo characterization of 15 scattered disk and detached objects observed with Herschel-PACS
AuthorsInstitution or Email of Authors
Santos-Sanz, P.Observatoire de Paris-Meudon, France
Lellouch, E.Observatoire de Paris-Meudon, France
Fornasier, S.Observatoire de Paris-Meudon, France
Kiss, C.Konkoly Observatory
Pal, A.Konkoly Observatory
Müller, T. G.MPE, Garching
Vilenius, E.MPE, Garching
Stansberry, J.U. of Arizona
Mommert, M.michael.mommert@dlr.de
Delsanti, A.Lab. d'Astrophysique de Marseille, France
Mueller, M.SRON, Netherlands
Peixinho, N.Center for Geophysics of the University of Coimbra
Henry, F.Observatoire de Paris-Meudon, France
Ortiz, J. L.IAA-CSIC Granada, Spain
Thirouin, A.IAA-CSIC Granada, Spain
Protopapa, S.U. of Maryland
Duffard, R.IAA-CSIC Granada, Spain
Szalai, N.Konkoly Observatory
Lim, T.RAL Didcot, UK
Ejeta, C.MPS, Lindau-Katlenburg
Hartogh, P.MPS, Lindau-Katlenburg
Harris, A. W.alan.harris@dlr.de
Rengel, M.MPS, Lindau-Katlenburg
Date:May 2012
Journal or Publication Title:Astronomy and Astrophysics
Refereed publication:Yes
In Open Access:No
In ISI Web of Science:No
Page Range:A92
Keywords:Kuiper belt: general, infrared: planetary systems, methods: observational, techniques: photometric
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EW - Erforschung des Weltraums
DLR - Research area:Space
DLR - Program:W EW - Erforschung des Weltraums
DLR - Research theme (Project):W - Vorhaben Exploration des Sonnensystems (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Asteroids and Comets
Deposited By: Michael Mommert
Deposited On:24 Oct 2012 08:26
Last Modified:20 Oct 2015 05:04

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