"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; D. Trilling; E. 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

doi:10.1051/0004-6361/201014648

"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, D. 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

Astronomy and Planetary Sciences

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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 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 p_v ∼ 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 language	English (US)
Article number	L147
Journal	Astronomy and Astrophysics
Volume	518
Issue number	3
DOIs	https://doi.org/10.1051/0004-6361/201014648
State	Published - Jul 16 2010

Keywords

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

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1051/0004-6361/201014648

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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., ... 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), Article L147. https://doi.org/10.1051/0004-6361/201014648

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, D, 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, L147. https://doi.org/10.1051/0004-6361/201014648

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

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: individual: (136108) Haumea, Techniques: photometric",

author = "E. Lellouch and C. Kiss and P. Santos-Sanz and M{\"u}ller, {T. G.} and S. Fornasier and O. Groussin and P. Lacerda and Ortiz, {J. L.} and A. Thirouin and A. Delsanti and R. Duffard and Harris, {A. W.} and F. Henry and T. Lim and R. Moreno and M. Mommert and M. Mueller and S. Protopapa and J. Stansberry and D. Trilling and E. Vilenius and A. Barucci and J. Crovisier and A. Doressoundiram and E. Dotto and Guti{\'e}rrez, {P. J.} and O. Hainaut and P. Hartogh and D. Hestroffer and J. Horner and L. Jorda and M. Kidger and L. Lara and M. Rengel and B. Swinyard and N. Thomas",

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doi = "10.1051/0004-6361/201014648",

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T2 - A survey of the trans-Neptunian region II. The thermal lightcurve of (136108) Haumea

AU - Lellouch, E.

AU - Kiss, C.

AU - Santos-Sanz, P.

AU - Müller, T. G.

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.

AU - Lim, T.

AU - Moreno, R.

AU - Mommert, M.

AU - Mueller, M.

AU - Protopapa, S.

AU - Stansberry, J.

AU - Trilling, D.

AU - Vilenius, E.

AU - Barucci, A.

AU - Crovisier, J.

AU - Doressoundiram, A.

AU - Dotto, E.

AU - Gutiérrez, P. J.

AU - Hainaut, O.

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.

PY - 2010/7/16

Y1 - 2010/7/16

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.

AB - 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.

KW - Kuiper belt objects: individual: (136108) Haumea

KW - Techniques: photometric

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JO - Astronomy and Astrophysics

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ER -

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

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Keywords

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