TNOs are cool: a survey of the trans-Neptunian region: XIV. Size/albedo characterization of the Haumea family observed with Herschel and Spitzer
Article
Article Title | TNOs are cool: a survey of the trans-Neptunian region: XIV. Size/albedo characterization of the Haumea family observed with Herschel and Spitzer |
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ERA Journal ID | 1050 |
Article Category | Article |
Authors | Vilenius, E. (Author), Stansberry, J. (Author), Muller, T. (Author), Mueller, M. (Author), Kiss, C. (Author), Santos-Sanz, P. (Author), Mommert, M. (Author), Pal, A. (Author), Lellouch, E. (Author), Ortiz, J. L. (Author), Peixinho, N. (Author), Thirouin, A. (Author), Lykawka, P. S. (Author), Horner, J. (Author), Duffard, R. (Author), Fornasier, S. (Author) and Delsanti, A. (Author) |
Journal Title | Astronomy and Astrophysics: a European journal |
Journal Citation | 618, pp. 1-15 |
Article Number | A136 |
Number of Pages | 15 |
Year | 2018 |
Publisher | EDP Sciences |
Place of Publication | France |
ISSN | 0004-6361 |
1432-0746 | |
Digital Object Identifier (DOI) | https://doi.org/10.1051/0004-6361/201732564 |
Web Address (URL) | https://www.aanda.org/articles/aa/full_html/2018/10/aa32564-17/aa32564-17.html |
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. Herschel is an ESA space observatory with science instruments provided by a European-led Principal Investigator consortia and with important participation from NASA. |
Keywords | Kuiper belt: infrared; planetary systems; observational; photometric; astrophysics; planetary astrophysics |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 519999. Other physical sciences not elsewhere classified |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Institution of Origin | University of Southern Queensland |
Byline Affiliations | Max Planck Society, Germany |
Space Telescope Science Institute, United States | |
Netherlands Institute for Space Research, Netherlands | |
Konkoly Observatory, Hungary | |
Institute of Astrophysics of Andalusia, Spain | |
Northern Arizona University, United States | |
Paris Observatory, France | |
University of Coimbra, Portugal | |
Lowell Observatory, United States | |
Kindai University, Japan | |
Centre for Astrophysics | |
Aix-Marseille University, France |
https://research.usq.edu.au/item/q5439/tnos-are-cool-a-survey-of-the-trans-neptunian-region-xiv-size-albedo-characterization-of-the-haumea-family-observed-with-herschel-and-spitzer
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