"TNOs are Cool": A survey of the trans-Neptunian region

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

Research output: Contribution to journalArticle

46 Citations (Scopus)

Abstract

Context. The goal of the Herschel open time programme "TNOs are Cool!" is to derive the physical and thermal properties for a large sample of Centaurs, and trans-Neptunian objects (TNOs), including resonant, classical, detached and scattered disk objects. Aims. Based on observations of two targets we tried (i) to optimise the SPIRE observing technique for faint (close to the background confusion noise), slowly moving targets; (ii) to test different thermal model techniques; (iii) to determine radiometric diameter and albedo values; (iv) to compare with Spitzer results whenever possible. Methods. We obtained SPIRE photometry on two targets and PACS photometry on one of the targets. Results. We present results for the two targets, (90482) Orcus and (136472) Makemake, observed with SPIRE and for one of those targets, Makemake, observed with PACS. We adopt pV = 0.27 and D = 850 km as our best estimate of the albedo and diameter of Orcus using single terrain models. With two-terrain models for Makemake, the bright terrain is fitted by, 0.78 < pV < 0.90, and the dark terrain 0.02 < pV < 0.12, giving 1360 < D < 1480 km. Conclusions. A single terrain model was derived for Orcus through the SPIRE photometry combined with MIPS data. The Makemake data from MIPS, PACS and SPIRE combined are not compatible with a single terrain model, but can be modelled with a two-terrain fit. These science demonstration observations have shown that the scanning technique, which allows us to judge the influence of background structures, has proved to be a good basis for this key programme.

Original languageEnglish (US)
JournalAstronomy and Astrophysics
Volume518
Issue number2
DOIs
StatePublished - Jul 16 2010

Fingerprint

trans-Neptunian objects
photometry
albedo
confusion
thermodynamic properties
physical properties
scanning
estimates

Keywords

  • Infrared: general
  • Kuiper belt objects: individual: 136472 Makemake
  • Kuiper belt objects: individual: 90482 Orcus
  • Submillimeter: general
  • Techniques: photometric

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Lim, T. L., Stansberry, J., Müller, T. G., Mueller, M., Lellouch, E., Kiss, C., ... Thomas, N. (2010). "TNOs are Cool": A survey of the trans-Neptunian region. Astronomy and Astrophysics, 518(2). https://doi.org/10.1051/0004-6361/201014701

"TNOs are Cool" : A survey of the trans-Neptunian region. / Lim, T. L.; Stansberry, J.; Müller, T. G.; Mueller, M.; Lellouch, E.; Kiss, C.; Santos-Sanz, P.; Vilenius, E.; Protopapa, S.; Moreno, R.; Delsanti, A.; Duffard, R.; Fornasier, S.; Groussin, O.; Harris, A. W.; Henry, F.; Horner, J.; Lacerda, P.; Mommert, M.; Ortiz, J. L.; Rengel, M.; Thirouin, A.; Trilling, David E; Barucci, A.; Crovisier, J.; Doressoundiram, A.; Dotto, E.; Gutiérrez Buenestado, P. J.; Hainaut, O.; Hartogh, P.; Hestroffer, D.; Kidger, M.; Lara, L.; Swinyard, B. M.; Thomas, N.

In: Astronomy and Astrophysics, Vol. 518, No. 2, 16.07.2010.

Research output: Contribution to journalArticle

Lim, TL, Stansberry, J, Müller, TG, Mueller, M, Lellouch, E, Kiss, C, Santos-Sanz, P, Vilenius, E, Protopapa, S, Moreno, R, Delsanti, A, Duffard, R, Fornasier, S, Groussin, O, Harris, AW, Henry, F, Horner, J, Lacerda, P, Mommert, M, Ortiz, JL, Rengel, M, Thirouin, A, Trilling, DE, Barucci, A, Crovisier, J, Doressoundiram, A, Dotto, E, Gutiérrez Buenestado, PJ, Hainaut, O, Hartogh, P, Hestroffer, D, Kidger, M, Lara, L, Swinyard, BM & Thomas, N 2010, '"TNOs are Cool": A survey of the trans-Neptunian region', Astronomy and Astrophysics, vol. 518, no. 2. https://doi.org/10.1051/0004-6361/201014701
Lim TL, Stansberry J, Müller TG, Mueller M, Lellouch E, Kiss C et al. "TNOs are Cool": A survey of the trans-Neptunian region. Astronomy and Astrophysics. 2010 Jul 16;518(2). https://doi.org/10.1051/0004-6361/201014701
Lim, T. L. ; Stansberry, J. ; Müller, T. G. ; Mueller, M. ; Lellouch, E. ; Kiss, C. ; Santos-Sanz, P. ; Vilenius, E. ; Protopapa, S. ; Moreno, R. ; Delsanti, A. ; Duffard, R. ; Fornasier, S. ; Groussin, O. ; Harris, A. W. ; Henry, F. ; Horner, J. ; Lacerda, P. ; Mommert, M. ; Ortiz, J. L. ; Rengel, M. ; Thirouin, A. ; Trilling, David E ; Barucci, A. ; Crovisier, J. ; Doressoundiram, A. ; Dotto, E. ; Gutiérrez Buenestado, P. J. ; Hainaut, O. ; Hartogh, P. ; Hestroffer, D. ; Kidger, M. ; Lara, L. ; Swinyard, B. M. ; Thomas, N. / "TNOs are Cool" : A survey of the trans-Neptunian region. In: Astronomy and Astrophysics. 2010 ; Vol. 518, No. 2.
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AU - Lim, T. L.

AU - Stansberry, J.

AU - Müller, T. G.

AU - Mueller, M.

AU - Lellouch, E.

AU - Kiss, C.

AU - Santos-Sanz, P.

AU - Vilenius, E.

AU - Protopapa, S.

AU - Moreno, R.

AU - Delsanti, A.

AU - Duffard, R.

AU - Fornasier, S.

AU - Groussin, O.

AU - Harris, A. W.

AU - Henry, F.

AU - Horner, J.

AU - Lacerda, P.

AU - Mommert, M.

AU - Ortiz, J. L.

AU - Rengel, M.

AU - Thirouin, A.

AU - Trilling, David E

AU - Barucci, A.

AU - Crovisier, J.

AU - Doressoundiram, A.

AU - Dotto, E.

AU - Gutiérrez Buenestado, P. J.

AU - Hainaut, O.

AU - Hartogh, P.

AU - Hestroffer, D.

AU - Kidger, M.

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N2 - Context. The goal of the Herschel open time programme "TNOs are Cool!" is to derive the physical and thermal properties for a large sample of Centaurs, and trans-Neptunian objects (TNOs), including resonant, classical, detached and scattered disk objects. Aims. Based on observations of two targets we tried (i) to optimise the SPIRE observing technique for faint (close to the background confusion noise), slowly moving targets; (ii) to test different thermal model techniques; (iii) to determine radiometric diameter and albedo values; (iv) to compare with Spitzer results whenever possible. Methods. We obtained SPIRE photometry on two targets and PACS photometry on one of the targets. Results. We present results for the two targets, (90482) Orcus and (136472) Makemake, observed with SPIRE and for one of those targets, Makemake, observed with PACS. We adopt pV = 0.27 and D = 850 km as our best estimate of the albedo and diameter of Orcus using single terrain models. With two-terrain models for Makemake, the bright terrain is fitted by, 0.78 < pV < 0.90, and the dark terrain 0.02 < pV < 0.12, giving 1360 < D < 1480 km. Conclusions. A single terrain model was derived for Orcus through the SPIRE photometry combined with MIPS data. The Makemake data from MIPS, PACS and SPIRE combined are not compatible with a single terrain model, but can be modelled with a two-terrain fit. These science demonstration observations have shown that the scanning technique, which allows us to judge the influence of background structures, has proved to be a good basis for this key programme.

AB - Context. The goal of the Herschel open time programme "TNOs are Cool!" is to derive the physical and thermal properties for a large sample of Centaurs, and trans-Neptunian objects (TNOs), including resonant, classical, detached and scattered disk objects. Aims. Based on observations of two targets we tried (i) to optimise the SPIRE observing technique for faint (close to the background confusion noise), slowly moving targets; (ii) to test different thermal model techniques; (iii) to determine radiometric diameter and albedo values; (iv) to compare with Spitzer results whenever possible. Methods. We obtained SPIRE photometry on two targets and PACS photometry on one of the targets. Results. We present results for the two targets, (90482) Orcus and (136472) Makemake, observed with SPIRE and for one of those targets, Makemake, observed with PACS. We adopt pV = 0.27 and D = 850 km as our best estimate of the albedo and diameter of Orcus using single terrain models. With two-terrain models for Makemake, the bright terrain is fitted by, 0.78 < pV < 0.90, and the dark terrain 0.02 < pV < 0.12, giving 1360 < D < 1480 km. Conclusions. A single terrain model was derived for Orcus through the SPIRE photometry combined with MIPS data. The Makemake data from MIPS, PACS and SPIRE combined are not compatible with a single terrain model, but can be modelled with a two-terrain fit. These science demonstration observations have shown that the scanning technique, which allows us to judge the influence of background structures, has proved to be a good basis for this key programme.

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KW - Kuiper belt objects: individual: 90482 Orcus

KW - Submillimeter: general

KW - Techniques: photometric

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