"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

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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 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 wellas 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. Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA.

Original language	English
Journal	Astronomy and Astrophysics
Volume	518
DOIs	https://doi.org/10.1051/0004-6361/201014648
Publication status	Published - 01 Jul 2010

Keywords

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

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10.1051/0004-6361/201014648

http://adsabs.harvard.edu/abs/2010A%26A...518L.147L

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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. https://doi.org/10.1051/0004-6361/201014648

@article{9658b1a845d74a009007b48d0f31d5ff,

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 wellas 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. Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA.",

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",

year = "2010",

month = jul,

day = "1",

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

language = "English",

volume = "518",

journal = "Astronomy and Astrophysics",

issn = "0004-6361",

publisher = "EDP Sciences",

}

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. https://doi.org/10.1051/0004-6361/201014648

TY - JOUR

T1 - "TNOs are cool'': 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 - 2010/7/1

Y1 - 2010/7/1

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 wellas 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. Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA.

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 wellas 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. Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA.

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

KW - techniques: photometric

U2 - 10.1051/0004-6361/201014648

DO - 10.1051/0004-6361/201014648

M3 - Article

SN - 0004-6361

VL - 518

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

ER -

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

Abstract

Keywords

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