Lellouch, Emmanuel and Kiss, Csaba and Santos Sanz, Pablo and Müller, Thomas and Fornasier, Sonia and Groussin, Olivier and Lacerda, Pedro and Ortiz Moreno, Jose Luis and Thirouin, Audrey and Delsanti, Audrey and Duffard, René D. and Harris, Alan W. and Henry, Florence and Lim, Tanya and Moreno, Raphael and Mommert, Michael and Mueller, Michael and Protopapa, Silvia and Stansberry, John and Trilling, David and Vilenius, Esa and Barucci, Antonella and Crovisier, Jacques and Doressoundiram, Alain and Dotto, Elisabetta and Gutierrez Buenestado, Pedro and Hainaut, Olivier and Hartogh, Paul and Hestroffer, Daniel and Horner, Jonathan and Jorda, Laurent and Kidger, Mark and Lara López, Luisa M. and Rengel, Miriam and Swinyard, Bruce and Thomas, Nicolas (2010) TNOs are Cool: A Survey of the Trans-Neptunian Region II. The thermal lightcurve of (136108) Haumea. Astronomy and Astrophysics, 518 (L147). EDP Sciences. DOI: 10.1051/0004-6361/201014648.
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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 of a factor of ~2, which is positively correlated with the optical lightcurve. This confirms that both are primarily due 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 with inferences from the optical lightcurve, supporting the hydrostatic equilibrium hypothesis. The large amplitude of the 100 μm lightcurve suggests 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.
|Title:||TNOs are Cool: A Survey of the Trans-Neptunian Region II. The thermal lightcurve of (136108) Haumea|
|Date:||11 May 2010|
|Journal or Publication Title:||Astronomy and Astrophysics|
|In Open Access:||No|
|In ISI Web of Science:||No|
|Keywords:||Kuiper belt objects: individual: (136108) Haumea / 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 Asteroiden und Kometen (old)|
|Institutes and Institutions:||Institute of Planetary Research > Asteroids and Comets|
|Deposited By:||Michael Mommert|
|Deposited On:||13 Oct 2010 12:41|
|Last Modified:||20 Oct 2015 05:04|
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