"tNOs are Cool": A survey of the trans-Neptunian region: XIV. Size/albedo characterization of the Haumea family observed with Herschel and Spitzer

E. Vilenius, J. Stansberry, T. Müller, M. Mueller, C. Kiss, P. Santos-Sanz, M. Mommert, A. Pál, E. Lellouch, J. L. Ortiz, N. Peixinho, A. Thirouin, P. S. Lykawka, J. Horner, R. Duffard, S. Fornasier, A. Delsanti

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Context. A group of trans-Neptunian objects (TNOs) are dynamically related to the dwarf planet 136108 Haumea. Ten of them show strong indications of water ice on their surfaces, are assumed to have resulted from a collision, and are accepted as the only known TNO collisional family. Nineteen other dynamically similar objects lack water ice absorptions and are hypothesized to be dynamical interlopers. Aims. We have made observations to determine sizes and geometric albedos of six of the accepted Haumea family members and one dynamical interloper. Ten other dynamical interlopers have been measured by previous works. We compare the individual and statistical properties of the family members and interlopers, examining the size and albedo distributions of both groups. We also examine implications for the total mass of the family and their ejection velocities. Methods. We use far-infrared space-based telescopes to observe the target TNOs near their thermal peak and combine these data with optical magnitudes to derive sizes and albedos using radiometric techniques. Using measured and inferred sizes together with ejection velocities, we determine the power-law slope of ejection velocity as a function of effective diameter. Results. The detected Haumea family members have a diversity of geometric albedos 0.3-0.8, which are higher than geometric albedos of dynamically similar objects without water ice. The median geometric albedo for accepted family members is pV = 0.48-0.18 +0.28, compared to 0.08-0.05 +0.07 for the dynamical interlopers. In the size range D = 175-300 km, the slope of the cumulative size distribution is q = 3.2-0.4 +0.7 for accepted family members, steeper than the q = 2.0 ± 0.6 slope for the dynamical interlopers with D < 500 km. The total mass of Haumea's moons and family members is 2.4% of Haumea's mass. The ejection velocities required to emplace them on their current orbits show a dependence on diameter, with a power-law slope of 0.21-0.50.

Original languageEnglish
Article number32564
JournalAstronomy and Astrophysics
Volume618
DOIs
Publication statusPublished - Oct 1 2018

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albedo
trans-Neptunian objects
ejection
slopes
ice
dwarf planets
water
power law
natural satellites
family
indication
telescopes
range size
Moon
orbits
collisions
planet
collision

Keywords

  • Infrared: planetary systems
  • Kuiper belt: general
  • Methods: observational
  • Techniques: photometric

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

"tNOs are Cool" : A survey of the trans-Neptunian region: XIV. Size/albedo characterization of the Haumea family observed with Herschel and Spitzer. / Vilenius, E.; Stansberry, J.; Müller, T.; Mueller, M.; Kiss, C.; Santos-Sanz, P.; Mommert, M.; Pál, A.; Lellouch, E.; Ortiz, J. L.; Peixinho, N.; Thirouin, A.; Lykawka, P. S.; Horner, J.; Duffard, R.; Fornasier, S.; Delsanti, A.

In: Astronomy and Astrophysics, Vol. 618, 32564, 01.10.2018.

Research output: Contribution to journalArticle

Vilenius, E, Stansberry, J, Müller, T, Mueller, M, Kiss, C, Santos-Sanz, P, Mommert, M, Pál, A, Lellouch, E, Ortiz, JL, Peixinho, N, Thirouin, A, Lykawka, PS, Horner, J, Duffard, R, Fornasier, S & Delsanti, A 2018, '"tNOs are Cool": A survey of the trans-Neptunian region: XIV. Size/albedo characterization of the Haumea family observed with Herschel and Spitzer', Astronomy and Astrophysics, vol. 618, 32564. https://doi.org/10.1051/0004-6361/201732564
Vilenius, E. ; Stansberry, J. ; Müller, T. ; Mueller, M. ; Kiss, C. ; Santos-Sanz, P. ; Mommert, M. ; Pál, A. ; Lellouch, E. ; Ortiz, J. L. ; Peixinho, N. ; Thirouin, A. ; Lykawka, P. S. ; Horner, J. ; Duffard, R. ; Fornasier, S. ; Delsanti, A. / "tNOs are Cool" : A survey of the trans-Neptunian region: XIV. Size/albedo characterization of the Haumea family observed with Herschel and Spitzer. In: Astronomy and Astrophysics. 2018 ; Vol. 618.
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abstract = "Context. A group of trans-Neptunian objects (TNOs) are dynamically related to the dwarf planet 136108 Haumea. Ten of them show strong indications of water ice on their surfaces, are assumed to have resulted from a collision, and are accepted as the only known TNO collisional family. Nineteen other dynamically similar objects lack water ice absorptions and are hypothesized to be dynamical interlopers. Aims. We have made observations to determine sizes and geometric albedos of six of the accepted Haumea family members and one dynamical interloper. Ten other dynamical interlopers have been measured by previous works. We compare the individual and statistical properties of the family members and interlopers, examining the size and albedo distributions of both groups. We also examine implications for the total mass of the family and their ejection velocities. Methods. We use far-infrared space-based telescopes to observe the target TNOs near their thermal peak and combine these data with optical magnitudes to derive sizes and albedos using radiometric techniques. Using measured and inferred sizes together with ejection velocities, we determine the power-law slope of ejection velocity as a function of effective diameter. Results. The detected Haumea family members have a diversity of geometric albedos 0.3-0.8, which are higher than geometric albedos of dynamically similar objects without water ice. The median geometric albedo for accepted family members is pV = 0.48-0.18 +0.28, compared to 0.08-0.05 +0.07 for the dynamical interlopers. In the size range D = 175-300 km, the slope of the cumulative size distribution is q = 3.2-0.4 +0.7 for accepted family members, steeper than the q = 2.0 ± 0.6 slope for the dynamical interlopers with D < 500 km. The total mass of Haumea's moons and family members is 2.4{\%} of Haumea's mass. The ejection velocities required to emplace them on their current orbits show a dependence on diameter, with a power-law slope of 0.21-0.50.",
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AU - Vilenius, E.

AU - Stansberry, J.

AU - Müller, T.

AU - Mueller, M.

AU - Kiss, C.

AU - Santos-Sanz, P.

AU - Mommert, M.

AU - Pál, A.

AU - Lellouch, E.

AU - Ortiz, J. L.

AU - Peixinho, N.

AU - Thirouin, A.

AU - Lykawka, P. S.

AU - Horner, J.

AU - Duffard, R.

AU - Fornasier, S.

AU - Delsanti, A.

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N2 - Context. A group of trans-Neptunian objects (TNOs) are dynamically related to the dwarf planet 136108 Haumea. Ten of them show strong indications of water ice on their surfaces, are assumed to have resulted from a collision, and are accepted as the only known TNO collisional family. Nineteen other dynamically similar objects lack water ice absorptions and are hypothesized to be dynamical interlopers. Aims. We have made observations to determine sizes and geometric albedos of six of the accepted Haumea family members and one dynamical interloper. Ten other dynamical interlopers have been measured by previous works. We compare the individual and statistical properties of the family members and interlopers, examining the size and albedo distributions of both groups. We also examine implications for the total mass of the family and their ejection velocities. Methods. We use far-infrared space-based telescopes to observe the target TNOs near their thermal peak and combine these data with optical magnitudes to derive sizes and albedos using radiometric techniques. Using measured and inferred sizes together with ejection velocities, we determine the power-law slope of ejection velocity as a function of effective diameter. Results. The detected Haumea family members have a diversity of geometric albedos 0.3-0.8, which are higher than geometric albedos of dynamically similar objects without water ice. The median geometric albedo for accepted family members is pV = 0.48-0.18 +0.28, compared to 0.08-0.05 +0.07 for the dynamical interlopers. In the size range D = 175-300 km, the slope of the cumulative size distribution is q = 3.2-0.4 +0.7 for accepted family members, steeper than the q = 2.0 ± 0.6 slope for the dynamical interlopers with D < 500 km. The total mass of Haumea's moons and family members is 2.4% of Haumea's mass. The ejection velocities required to emplace them on their current orbits show a dependence on diameter, with a power-law slope of 0.21-0.50.

AB - Context. A group of trans-Neptunian objects (TNOs) are dynamically related to the dwarf planet 136108 Haumea. Ten of them show strong indications of water ice on their surfaces, are assumed to have resulted from a collision, and are accepted as the only known TNO collisional family. Nineteen other dynamically similar objects lack water ice absorptions and are hypothesized to be dynamical interlopers. Aims. We have made observations to determine sizes and geometric albedos of six of the accepted Haumea family members and one dynamical interloper. Ten other dynamical interlopers have been measured by previous works. We compare the individual and statistical properties of the family members and interlopers, examining the size and albedo distributions of both groups. We also examine implications for the total mass of the family and their ejection velocities. Methods. We use far-infrared space-based telescopes to observe the target TNOs near their thermal peak and combine these data with optical magnitudes to derive sizes and albedos using radiometric techniques. Using measured and inferred sizes together with ejection velocities, we determine the power-law slope of ejection velocity as a function of effective diameter. Results. The detected Haumea family members have a diversity of geometric albedos 0.3-0.8, which are higher than geometric albedos of dynamically similar objects without water ice. The median geometric albedo for accepted family members is pV = 0.48-0.18 +0.28, compared to 0.08-0.05 +0.07 for the dynamical interlopers. In the size range D = 175-300 km, the slope of the cumulative size distribution is q = 3.2-0.4 +0.7 for accepted family members, steeper than the q = 2.0 ± 0.6 slope for the dynamical interlopers with D < 500 km. The total mass of Haumea's moons and family members is 2.4% of Haumea's mass. The ejection velocities required to emplace them on their current orbits show a dependence on diameter, with a power-law slope of 0.21-0.50.

KW - Infrared: planetary systems

KW - Kuiper belt: general

KW - Methods: observational

KW - Techniques: photometric

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