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TNOs are Cool: A Survey of the Trans-Neptunian Region II. The thermal lightcurve of (136108) Haumea

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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Official URL: http://www.aanda.org/index.php?option=com_article&access=doi&doi=10.1051/0004-6361/201014648&Itemid=129

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 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.

Document Type:Article
Title:TNOs are Cool: A Survey of the Trans-Neptunian Region II. The thermal lightcurve of (136108) Haumea
Authors:
AuthorsInstitution or Email of Authors
Lellouch, EmmanuelObservatoire de Paris-Meudon, France
Kiss, CsabaKonkoly Observatory, Hungary
Santos Sanz, PabloObservatoire de Paris, France
Müller, ThomasMPI für Extraterrestrische Physik, Germany
Fornasier, SoniaObservatoire de Paris-Meudon, France
Groussin, OlivierLab. d'Astrophysique de Marseille, France
Lacerda, PedroQueen's University Belfast
Ortiz Moreno, Jose LuisIAA-CSIC Granada, Spain
Thirouin, AudreyIAA-CSIC Granada, Spain
Delsanti, AudreyLab. d'Astrophysique de Marseille, France
Duffard, René D.IAA-CSIC Granada, Spain
Harris, Alan W.alan.harris@dlr.de
Henry, FlorenceObservatoire de Paris-Meudon, France
Lim, TanyaRAL Didcot, UK
Moreno, RaphaelObservatoire de Paris-Meudon, France
Mommert, Michaelmichael.mommert@dlr.de
Mueller, MichaelObservatoire de la Côte d'Azur
Protopapa, SilviaMPI für Sonnensystemforschung, Germany
Stansberry, JohnUniversity of Arizona, USA
Trilling, DavidNorthern Arizona University, USA
Vilenius, EsaMPI für Extraterrestrische Physik, Germany
Barucci, AntonellaObservatoire de Paris-Meudon, France
Crovisier, JacquesObservatoire de Paris-Meudon, France
Doressoundiram, AlainObservatoire de Paris-Meudon, France
Dotto, ElisabettaOsservatorio Astronomico di Roma, Italy
Gutierrez Buenestado, PedroIAA-CSIC Granada, Spain
Hainaut, OlivierESO
Hartogh, PaulMPI für Sonnensystemforschung, Germany
Hestroffer, DanielObservatoire de Paris, France
Horner, JonathanOpen University, Milton Keynes, UK
Jorda, LaurentLab. d'Astrophysique de Marseille, France
Kidger, MarkESAC, Villafranca del Castillo, Spain
Lara López, Luisa M.IAA-CSIC Granada, Spain
Rengel, MiriamMPI für Sonnensystemforschung, Germany
Swinyard, BruceRAL Didcot, UK
Thomas, NicolasUniversity of Bern, Switzerland
Date:11 May 2010
Journal or Publication Title:Astronomy and Astrophysics
Refereed publication:Yes
In Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:518
DOI:10.1051/0004-6361/201014648
Publisher:EDP Sciences
Status:Published
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)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Asteroids and Comets
Deposited By: Michael Mommert
Deposited On:13 Oct 2010 12:41
Last Modified:20 Mar 2013 19:43

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