TNOs are cool: a survey of the trans-Neptunian region: II. The thermal lightcurve of (136108) Haumea
Article
Article Title | TNOs are cool: a survey of the trans-Neptunian region: II. The thermal lightcurve of (136108) Haumea |
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ERA Journal ID | 1050 |
Article Category | Article |
Authors | Lellouch, E. (Author), Kiss, C. (Author), Santos-Sanz, P. (Author), Muller, T. G. (Author), Fornasier, S. (Author), Groussin, O. (Author), Lacerda, P. (Author), Ortiz, J. L. (Author), Thirouin, A. (Author), Delsanti, A. (Author), Duffard, R. (Author), Harris, A. W. (Author), Henry, F. (Author), Lim, T. (Author), Moreno, R. (Author), Mommert, M. (Author), Mueller, M. (Author), Protopapa, S. (Author), Stansberry, J. (Author), Trilling, D. (Author), Vilenius, E. (Author), Barucci, A. (Author), Crovisier, J. (Author), Doressoundiram, A. (Author), Dotto, E. (Author), Gutierrez, P. J. (Author), Hainaut, O. (Author), Hartogh, P. (Author), Hestroffer, D. J. (Author), Horner, J. (Author), Jorda, L. (Author), Kidger, M. (Author), Lara, L. (Author), Rengel, M. (Author), Swinyard, B. (Author) and Thomas, N. (Author) |
Journal Title | Astronomy and Astrophysics: a European journal |
Journal Citation | 518 (3), p. L147 |
Number of Pages | 5 |
Year | 2010 |
Publisher | EDP Sciences |
Place of Publication | Les Ulis, France |
ISSN | 0004-6361 |
1432-0746 | |
Digital Object Identifier (DOI) | https://doi.org/10.1051/0004-6361/201014648 |
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. |
Keywords | Kuiper belt objects; 136108; Haumea; photometric techniques |
ANZSRC Field of Research 2020 | 519999. Other physical sciences not elsewhere classified |
510104. Galactic astronomy | |
Public Notes | © ESO, 2010. This publication is copyright. It may be reproduced in whole or in part for the purposes of study, research, or review, but is subject to the inclusion of an acknowledgment of the source. |
Institution of Origin | University of Southern Queensland |
Byline Affiliations | Paris Observatory, France |
Konkoly Observatory, Hungary | |
Max Planck Society, Germany | |
Marseille Observatory, France | |
Queen's University Belfast, United Kingdom | |
Institute of Astrophysics of Andalusia, Spain | |
German Aerospace Centre, Germany | |
Rutherford Appleton Laboratory, United Kingdom | |
Cote d'Azur Observatory, France | |
University of Arizona, United States | |
Northern Arizona University, United States | |
Astronomical Observatory of Rome, Italy | |
European Southern Observatory (ESO), Germany | |
Durham University, United Kingdom | |
Aix-Marseille University, France | |
European Space Astronomy Centre, Spain | |
University of Bern, Switzerland |
https://research.usq.edu.au/item/q27y7/tnos-are-cool-a-survey-of-the-trans-neptunian-region-ii-the-thermal-lightcurve-of-136108-haumea
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