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TNOs are Cool: A survey of the trans-Neptunian region

Fornasier, S. and Lellouch, E. and Müller, T.G. and Santos-Sanz, P. and Panuzzo, P. and Kiss, C. and Lim, T. and Mommert, M. and Bockelée-Morvan, D. and Vilenius, E. and Stansberry, J.A. and Tozzi, G. P. and Mottola, S. and Delsanti, A. and Crovisier, J. and Duffard, R. and Henry, F. and Lacerda, P. and Barucci, A. and Gicquel, A. (2013) TNOs are Cool: A survey of the trans-Neptunian region. Astronomy & Astrophysics, 555, pp. 15-36. EDP Sciences. DOI: 10.1051/0004-6361/201321329 ISSN 0004-6361

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Official URL: http://dx.doi.org/10.1051/0004-6361/201321329


Aims. Trans-Neptunian objects (TNOs) are bodies populating the Kuiper belt and they are believed to retain the most pristine and least altered material of the solar system. The Herschel open time key programme entitled “TNOs are Cool: A survey of the trans-Neptunian region” has been awarded 373 h to investigate the albedo, size distribution and thermal properties of TNOs and Centaurs. Here we focus on the brightest targets observed by both the PACS and SPIRE multiband photometers: the dwarf planet Haumea, six TNOs (Huya, Orcus, Quaoar, Salacia, 2002 UX25, and 2002 TC302), and two Centaurs (Chiron and Chariklo). Methods. Flux densities are derived from PACS and SPIRE instruments using optimised data reduction methods. The spectral energy distribution obtained with the Herschel PACS and SPIRE instruments over 6 bands (centred at 70, 100, 160, 250, 350, and 500 μm), with Spitzer-MIPS at 23.7 and 71.4 μm, and with WISE at 11.6 and 22.1 μm in the case of 10199 Chariklo, has been modelled with the NEATM thermal model in order to derive the albedo, diameter, and beaming factor. For the Centaurs Chiron and Chariklo and for the 1000 km sized Orcus and Quaoar, a thermophysical model was also run to better constrain their thermal properties. Results. We derive the size, albedo, and thermal properties, including thermal inertia and surface emissivity, for the 9 TNOs and Centaurs. Several targets show a significant decrease in their spectral emissivity longwards of ∼300 μm and especially at 500 μm. Using our size estimations and the mass values available in the literature, we also derive the bulk densities for the binaries Quaoar/Weywot (2.18 (+0.43;−0.36)g/cm3), Orcus/Vanth (1.53 (+0.15; −0.13) g/cm3), and Salacia/Actea (1.29 (+0.29; −0.23) g/cm3). Quaoar’s density is similar to that of the other dwarf planets Pluto and Haumea, and its value implies high contents of refractory materials mixed with ices.

Item URL in elib:https://elib.dlr.de/83058/
Document Type:Article
Title:TNOs are Cool: A survey of the trans-Neptunian region
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Lellouch, E.LESIA, Observatoire de Paris, Meudon, FranceUNSPECIFIED
Müller, T.G.Max-Planck-Institut fuer Extraterrestrische Physik, GarchingUNSPECIFIED
Kiss, C.Konkoly Observatory, HungaryUNSPECIFIED
Lim, T.Rutherford Appleton Laboratory, United KingdomUNSPECIFIED
Mommert, M.michael.mommert (at) dlr.deUNSPECIFIED
Vilenius, E.Max-Planck-Institut fuer Extraterrestrische Physik, GarchingUNSPECIFIED
Stansberry, J.A.University of Arizona, USAUNSPECIFIED
Tozzi, G. P.Osservatorio Astrofisico ArcetriUNSPECIFIED
Mottola, S.stefano.mottola (at) dlr.deUNSPECIFIED
Delsanti, A.LAM MarseilleUNSPECIFIED
Duffard, R.Instituto de Astrofísica de AndalucíaUNSPECIFIED
Lacerda, P.Queens University BelfastUNSPECIFIED
Journal or Publication Title:Astronomy & Astrophysics
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1051/0004-6361/201321329
Page Range:pp. 15-36
Publisher:EDP Sciences
Keywords:Kuiper belt: general – techniques: photometric – methods: observational – infrared: planetary systems
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Science and Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Erforschung des Weltraums
DLR - Research theme (Project):R - Vorhaben Asteroiden und Kometen (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Asteroids and Comets
Deposited By: Mottola, Dr.phys. Stefano
Deposited On:19 Sep 2013 09:32
Last Modified:08 Mar 2018 18:22

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