Similar origin for low- and high-albedo Jovian Trojans and Hilda asteroids?
Hilda asteroids and Jupiter Trojans are two low-albedo (p[subscript v] ~ 0.07) populations for which the Nice model predicts an origin in the primordial Kuiper Belt region. However, recent surveys by WISE and the Spitzer Space Telescope (SST) have revealed that ~2% of these objects possess high albe...
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| Format: | Article |
| Language: | en_US |
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EDP Sciences
2015
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| Online Access: | http://hdl.handle.net/1721.1/97873 |
| _version_ | 1826203150041743360 |
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| author | Marsset, M. Vernazza, P. Gourgeot, F. Dumas, C. Lamy, P. Birlan, Mirel Binzel, Richard P |
| author2 | Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences |
| author_facet | Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences Marsset, M. Vernazza, P. Gourgeot, F. Dumas, C. Lamy, P. Birlan, Mirel Binzel, Richard P |
| author_sort | Marsset, M. |
| collection | MIT |
| description | Hilda asteroids and Jupiter Trojans are two low-albedo (p[subscript v] ~ 0.07) populations for which the Nice model predicts an origin in the primordial Kuiper Belt region. However, recent surveys by WISE and the Spitzer Space Telescope (SST) have revealed that ~2% of these objects possess high albedos (p[subscript v] ≥ 0.15), which might indicate interlopers – that is, objects not formed in the Kuiper Belt – among these two populations. Here, we report spectroscopic observations in the visible and / or near-infrared spectral ranges of twelve high-albedo (p[subscript v] > 0.15) Hilda asteroids and Jupiter Trojans. These twelve objects have spectral properties similar to those of the low-albedo population, which suggests a similar composition and hence a similar origin for low- and high-albedo Hilda asteroids and Jupiter Trojans. We therefore propose that most high albedos probably result from statistical bias or uncertainties that affect the WISE and SST measurements. However, some of the high albedos may be true and the outcome of some collision-induced resurfacing by a brighter material that could include water ice. Future work should attempt to investigate the nature of this supposedly bright material. The lack of interlopers in our sample allows us to set an upper limit of 0.4% at a confidence level of 99.7% on the abundance of interlopers with unexpected taxonomic classes (e.g., A-, S-, V-type asteroids) among these two populations. |
| first_indexed | 2024-09-23T12:32:26Z |
| format | Article |
| id | mit-1721.1/97873 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T12:32:26Z |
| publishDate | 2015 |
| publisher | EDP Sciences |
| record_format | dspace |
| spelling | mit-1721.1/978732024-05-15T02:41:32Z Similar origin for low- and high-albedo Jovian Trojans and Hilda asteroids? Marsset, M. Vernazza, P. Gourgeot, F. Dumas, C. Lamy, P. Birlan, Mirel Binzel, Richard P Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences Binzel, Richard P. Hilda asteroids and Jupiter Trojans are two low-albedo (p[subscript v] ~ 0.07) populations for which the Nice model predicts an origin in the primordial Kuiper Belt region. However, recent surveys by WISE and the Spitzer Space Telescope (SST) have revealed that ~2% of these objects possess high albedos (p[subscript v] ≥ 0.15), which might indicate interlopers – that is, objects not formed in the Kuiper Belt – among these two populations. Here, we report spectroscopic observations in the visible and / or near-infrared spectral ranges of twelve high-albedo (p[subscript v] > 0.15) Hilda asteroids and Jupiter Trojans. These twelve objects have spectral properties similar to those of the low-albedo population, which suggests a similar composition and hence a similar origin for low- and high-albedo Hilda asteroids and Jupiter Trojans. We therefore propose that most high albedos probably result from statistical bias or uncertainties that affect the WISE and SST measurements. However, some of the high albedos may be true and the outcome of some collision-induced resurfacing by a brighter material that could include water ice. Future work should attempt to investigate the nature of this supposedly bright material. The lack of interlopers in our sample allows us to set an upper limit of 0.4% at a confidence level of 99.7% on the abundance of interlopers with unexpected taxonomic classes (e.g., A-, S-, V-type asteroids) among these two populations. 2015-07-21T15:56:32Z 2015-07-21T15:56:32Z 2014-08 2014-04 Article http://purl.org/eprint/type/JournalArticle 0004-6361 1432-0746 http://hdl.handle.net/1721.1/97873 Marsset, M., P. Vernazza, F. Gourgeot, C. Dumas, M. Birlan, P. Lamy, and R. P. Binzel. “Similar Origin for Low- and High-Albedo Jovian Trojans and Hilda Asteroids?” A&A 568 (August 2014): L7. © 2014 ESO en_US http://dx.doi.org/10.1051/0004-6361/201424105 Astronomy & Astrophysics Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf EDP Sciences Astronomy and Astrophysics |
| spellingShingle | Marsset, M. Vernazza, P. Gourgeot, F. Dumas, C. Lamy, P. Birlan, Mirel Binzel, Richard P Similar origin for low- and high-albedo Jovian Trojans and Hilda asteroids? |
| title | Similar origin for low- and high-albedo Jovian Trojans and Hilda asteroids? |
| title_full | Similar origin for low- and high-albedo Jovian Trojans and Hilda asteroids? |
| title_fullStr | Similar origin for low- and high-albedo Jovian Trojans and Hilda asteroids? |
| title_full_unstemmed | Similar origin for low- and high-albedo Jovian Trojans and Hilda asteroids? |
| title_short | Similar origin for low- and high-albedo Jovian Trojans and Hilda asteroids? |
| title_sort | similar origin for low and high albedo jovian trojans and hilda asteroids |
| url | http://hdl.handle.net/1721.1/97873 |
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