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arXiv: 1005.2923

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"TNOs are Cool": A survey of the trans-Neptunian region I. Results from the Herschel Science Demonstration Phase (SDP)

T. G. Mueller, E. Lellouch 1, J. Stansberry, C. Kiss, P. Santos-Sanz 1, E. Vilenius, S. Protopapa, R. Moreno 1, M. Mueller 2, A. Delsanti 1, R. Duffard 3, S. Fornasier 1, O. Groussin 4, A. W. Harris 5, F. Henry 1, 6, J. Horner, P. Lacerda, T. Lim 7, M. Mommert, J. L. Ortiz 3, M. Rengel 8, A. Thirouin 3, D. Trilling, A. Barucci, J. Crovisier 1, A. Doressoundiram 1, E. Dotto 9, P. J. Gutierrez 10, O. R. Hainaut, P. Hartogh 8, D. Hestroffer 11, M. Kidger, L. Lara 10, B. Swinyard, N. Thomas

(2010-05-17)

The goal of the Herschel Open Time Key programme "TNOs are Cool!" is to derive the physical and thermal properties for a large sample of Centaurs and trans-Neptunian objects (TNOs), including resonant, classical, detached and scattered disk objects. We present results for seven targets either observed in PACS point-source, or in mini scan-map mode. Spitzer-MIPS observations were included for three objects. The sizes of these targets range from 100 km to almost 1000 km, five have low geometric albedos below 10%, (145480) 2005 TB190 has a higher albedo above 15%. Classical thermal models driven by an intermediate beaming factor of $\eta$=1.2 or $\eta$-values adjusted to the observed colour temperature fit the multi-band observations well in most cases. More sophisticated thermophysical models give very similar diameter and albedo values for thermal inertias in the range 0-25 Jm-2s-0.5K-1, consistent with very low heat conductivities at temperatures far away from the Sun. The early experience with observing and model strategies will allow us to derive physical and thermal properties for our complete Herschel TNO sample of 140 targets as a benchmark for understanding the solar system debris disk, and extra-solar ones as well.

1:	Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA)
	CNRS : UMR8109 – INSU – Observatoire de Paris – Université Pierre et Marie Curie [UPMC] - Paris VI – Université Paris VII - Paris Diderot
2:	Laboratoire de Cosmologie, Astrophysique Stellaire & Solaire, de Planétologie et de Mécanique des Fluides (CASSIOPEE)
	Université Nice Sophia Antipolis [UNS] – CNRS : UMR6202 – Observatoire de la Côte d'Azur – INSU
3:	Instituto de Astrofisica de Andalucia (IAA-CSIC)
	Instituto de Astrofísica de Andalucía
4:	Laboratoire d'Astrophysique de Marseille (LAM)
	CNRS : UMR6110 – INSU – Université de Provence - Aix-Marseille I
5:	Institute of Planetary Research
	German Aerospace Center (DLR)
6:	Laboratoire d'Océanologie et de Géosciences (LOG)
	CNRS : UMR8187 – Université Lille I - Sciences et technologies – Université du Littoral Côte d'Opale
7:	Laboratoire de Probabilités et Modèles Aléatoires (LPMA)
	CNRS : UMR7599 – Université Pierre et Marie Curie [UPMC] - Paris VI – Université Paris VII - Paris Diderot
8:	Max-Planck-Institut für Sonnensystemforschung
	Max-Planck-Institut für sonnensystemforschung
9:	INAF Osservatorio Astronomico di Roma
	INAF
10:	Instituto de Astrofisica de Andalucia
	CSIC
11:	Institut de Mécanique Céleste et de Calcul des Ephémérides (IMCCE)
	CNRS : UMR8028 – INSU – Observatoire de Paris – Université Pierre et Marie Curie [UPMC] - Paris VI – Université Lille I - Sciences et technologies

Subject

:

Physics/Astrophysics/Earth and Planetary Astrophysics Sciences of the Universe/Astrophysics/Earth and Planetary Astrophysics

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From: Catherine Beaussier <>

Submitted on: Monday, 23 January 2012 12:20:18

Updated on: Monday, 23 January 2012 12:20:18