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

Author： Lellouch E.   Kiss C.   Santos-Sanz P.   Müller T. G.   Fornasier S.   Groussin O.   Lacerda P.   Ortiz J. L.   Thirouin A.   Delsanti A.   Duffard R.   Harris A. W.   Henry F.   Lim T.   Moreno R.   Mommert M.   Mueller M.   Protopapa S.   Stansberry J.   Trilling D.   Vilenius E.   Barucci A.   Crovisier J.   Doressoundiram A.   Dotto E.   Gutiérrez P. J.   Hainaut O.   Hartogh P.   Hestroffer D.   Horner J.   Jorda L.   Kidger M.   Lara L.   Rengel M.   Swinyard B.   Thomas N.  

Publisher： Edp Sciences

E-ISSN： 1432-0746|518|issue|L147-L147

ISSN： 0004-6361

Source： Astronomy & Astrophysics, Vol.518, Iss.issue, 2010-07, pp. : L147-L147

Disclaimer: Any content in publications that violate the sovereignty, the constitution or regulations of the PRC is not accepted or approved by CNPIEC.

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Abstract

Thermal emission from Kuiper belt object (136108) Haumea was measured with Herschel–PACS at 100 μm and 160 μm for almost a full rotation period. Observations clearly indicate a 100 μm thermal lightcurve with an amplitude ofa factor of ~2, which is positively correlated with the optical lightcurve. This confirms that both are primarilydue to shape effects. A 160 μm lightcurve is marginally detected. Radiometric fits of the mean Herschel- and Spitzer-fluxes indicate an equivalent diameter D ~ 1300 km and a geometric albedo pv ~ 0.70–0.75. These values agree withinferences from the optical lightcurve, supporting the hydrostatic equilibrium hypothesis. The large amplitude of the 100 μm lightcurvesuggests that the object has a high projected a/b axis ratio (~1.3) and a low thermal inertia as well as possible variable infrared beaming. This may point to fine regolith on the surface, with a lunar-type photometric behavior. The quality of the thermal data is not sufficient to clearly detect the effects of a surface dark spot.

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