"TNOs are cool": A survey of the trans-Neptunian region II. The thermal lightcurve of (136108) Haumea

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

Research output: Contribution to journalArticle

35 Citations (Scopus)

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.

Original languageEnglish (US)
JournalAstronomy and Astrophysics
Volume518
Issue number3
DOIs
StatePublished - Jul 16 2010

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trans-Neptunian objects
Kuiper belt
regolith
thermal emission
hydrostatics
albedo
inference
inertia
effect

Keywords

  • Kuiper belt objects: individual: (136108) Haumea
  • Techniques: photometric

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Lellouch, E., Kiss, C., Santos-Sanz, P., Müller, T. G., Fornasier, S., Groussin, O., ... Thomas, N. (2010). "TNOs are cool": A survey of the trans-Neptunian region II. The thermal lightcurve of (136108) Haumea. Astronomy and Astrophysics, 518(3). https://doi.org/10.1051/0004-6361/201014648

"TNOs are cool" : A survey of the trans-Neptunian region II. The thermal lightcurve of (136108) Haumea. / 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, David E; 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.

In: Astronomy and Astrophysics, Vol. 518, No. 3, 16.07.2010.

Research output: Contribution to journalArticle

Lellouch, E, Kiss, C, Santos-Sanz, P, Müller, TG, Fornasier, S, Groussin, O, Lacerda, P, Ortiz, JL, Thirouin, A, Delsanti, A, Duffard, R, Harris, AW, Henry, F, Lim, T, Moreno, R, Mommert, M, Mueller, M, Protopapa, S, Stansberry, J, Trilling, DE, Vilenius, E, Barucci, A, Crovisier, J, Doressoundiram, A, Dotto, E, Gutiérrez, PJ, Hainaut, O, Hartogh, P, Hestroffer, D, Horner, J, Jorda, L, Kidger, M, Lara, L, Rengel, M, Swinyard, B & Thomas, N 2010, '"TNOs are cool": A survey of the trans-Neptunian region II. The thermal lightcurve of (136108) Haumea', Astronomy and Astrophysics, vol. 518, no. 3. https://doi.org/10.1051/0004-6361/201014648
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, David E ; 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. / "TNOs are cool" : A survey of the trans-Neptunian region II. The thermal lightcurve of (136108) Haumea. In: Astronomy and Astrophysics. 2010 ; Vol. 518, No. 3.
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AU - Fornasier, S.

AU - Groussin, O.

AU - Lacerda, P.

AU - Ortiz, J. L.

AU - Thirouin, A.

AU - Delsanti, A.

AU - Duffard, R.

AU - Harris, A. W.

AU - Henry, F.

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AU - Mueller, M.

AU - Protopapa, S.

AU - Stansberry, J.

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AU - Hartogh, P.

AU - Hestroffer, D.

AU - Horner, J.

AU - Jorda, L.

AU - Kidger, M.

AU - Lara, L.

AU - Rengel, M.

AU - Swinyard, B.

AU - Thomas, N.

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N2 - 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.

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