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TNOs are Cool: Analysis of Classical Kuiper Belt Objects from Herschel Space Observatory Data

Vilenius, E. and Kiss, C. and Mommert, M. and Müller, T. and Santos-Sanz, P. and Pal, A. and Stansberry, J. and Mueller, M. and Peixinho, N. and Fornasier, S. and Lellouch, E. and Delsanti, A. and Thirouin, A. and Duffard, R. and Ortiz, J. (2012) TNOs are Cool: Analysis of Classical Kuiper Belt Objects from Herschel Space Observatory Data. 44th annual meeting of the Division for Planetary Sciences of the American Astronomical Society, 14.-19. Okt. 2012, Reno, NV.

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Abstract

We present results from the sample analysis of classical Kuiper belt objects (CKBO) observed within the open time key program "TNOs are Cool" [Muller et al. 2009, Earth, Moon, Planets 105] of Herschel Space Observatory. About half of this sample was published in Vilenius et al. (2012, A&A 541) and together with earlier Spitzer Space Telecope results [Stansberry et al. 2008, in "Solar System Beyound Neptune" and Brucker et al. 2009, Icarus 201] the number of CKBOs with radiometric diameter/albedo solutions is increased to almost 40. About one quarter of these targets are dynamically cold. For the binaries (∼10) the effective radiometric size of the system is acquired to infer bulk densities. Our 3-band (70, 100, 160 µm) photometric observations with PACS cover the wavelength range where thermal emission from trans-Neptunian objects has its maximum. Each target was observed twice in order to characterize and remove the sky background, which is required in doing photometry of these faint targets. In order to derive simultaneously diameters and albedos from thermal-IR observations a thermal model is used in combination with absolute visual magnitudes and an assumed form of the phase integral. We use complementary data from Spitzer when available. The thermal model requires assumptions on the temperature distribution on the surface. We use the Near-Earth Asteroid Thermal Model [Harris 1998, Icarus 131] and fit the beaming parameter whenever data quality permits. We analyse correlations between the measured diameters and geometric albedos as well as between physical properties and colors or orbital elements for both the dynamically cold and hot CKBOs. We also analyse separately the correlations of large objects (D > ∼500 km). The anti-correlation found between diameter and geometric albedo of dynamically hot CKBOs [Vilenius et al., 2012] will be re-investigated. We acknowledge support from German DLR, project 50 OR 1108.

Document Type:Conference or Workshop Item (Speech)
Title:TNOs are Cool: Analysis of Classical Kuiper Belt Objects from Herschel Space Observatory Data
Authors:
AuthorsInstitution or Email of Authors
Vilenius, E.MPE, Garching
Kiss, C.Konkoly Observatory
Mommert, M.michael.mommert@dlr.de
Müller, T.MPE, Garching
Santos-Sanz, P.IAA, Spain
Pal, A.Konkoly Observatory
Stansberry, J.U. of Arizona
Mueller, M.SRON, Netherlands
Peixinho, N.Astronomical Observatory of the University of Coimbra, Portugal
Fornasier, S.Observatoire de Paris-Meudon, France
Lellouch, E.Observatoire de Paris-Meudon, France
Delsanti, A.Laboratoire d'Astrophysique de Marseille, France
Thirouin, A.IAA-CSIC Granada, Spain
Duffard, R.IAA-CSIC Granada, Spain
Ortiz, J.IAA-CSIC Granada, Spain
Date:2012
Status:Published
Keywords:TNOs, Classicals
Event Title:44th annual meeting of the Division for Planetary Sciences of the American Astronomical Society
Event Location:Reno, NV
Event Type:international Conference
Event Dates:14.-19. Okt. 2012
Organizer:DPS
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 Exploration des Sonnensystems
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Asteroids and Comets
Deposited By: Michael Mommert
Deposited On:09 Nov 2012 10:07
Last Modified:09 Nov 2012 10:07

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