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Near-infrared observations of active asteroid (3200) Phaethon reveal no evidence for hydration

Asteroid (3200) Phaethon is an active near-Earth asteroid and the parent body of the Geminid Meteor Shower. Because of its small perihelion distance, Phaethon’s surface reaches temperatures sufficient to destabilize hydrated materials. We conducted rotationally resolved spectroscopic observations of...

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Autores principales: Takir, Driss, Kareta, Theodore, Emery, Joshua P., Hanuš, Josef, Reddy, Vishnu, Howell, Ellen S., Rivkin, Andrew S., Arai, Tomoko
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7188859/
https://www.ncbi.nlm.nih.gov/pubmed/32345969
http://dx.doi.org/10.1038/s41467-020-15637-7
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author Takir, Driss
Kareta, Theodore
Emery, Joshua P.
Hanuš, Josef
Reddy, Vishnu
Howell, Ellen S.
Rivkin, Andrew S.
Arai, Tomoko
author_facet Takir, Driss
Kareta, Theodore
Emery, Joshua P.
Hanuš, Josef
Reddy, Vishnu
Howell, Ellen S.
Rivkin, Andrew S.
Arai, Tomoko
author_sort Takir, Driss
collection PubMed
description Asteroid (3200) Phaethon is an active near-Earth asteroid and the parent body of the Geminid Meteor Shower. Because of its small perihelion distance, Phaethon’s surface reaches temperatures sufficient to destabilize hydrated materials. We conducted rotationally resolved spectroscopic observations of this asteroid, mostly covering the northern hemisphere and the equatorial region, beyond 2.5-µm to search for evidence of hydration on its surface. Here we show that the observed part of Phaethon does not exhibit the 3-µm hydrated mineral absorption (within 2σ). These observations suggest that Phaethon’s modern activity is not due to volatile sublimation or devolatilization of phyllosilicates on its surface. It is possible that the observed part of Phaethon was originally hydrated and has since lost volatiles from its surface via dehydration, supporting its connection to the Pallas family, or it was formed from anhydrous material.
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spelling pubmed-71888592020-05-01 Near-infrared observations of active asteroid (3200) Phaethon reveal no evidence for hydration Takir, Driss Kareta, Theodore Emery, Joshua P. Hanuš, Josef Reddy, Vishnu Howell, Ellen S. Rivkin, Andrew S. Arai, Tomoko Nat Commun Article Asteroid (3200) Phaethon is an active near-Earth asteroid and the parent body of the Geminid Meteor Shower. Because of its small perihelion distance, Phaethon’s surface reaches temperatures sufficient to destabilize hydrated materials. We conducted rotationally resolved spectroscopic observations of this asteroid, mostly covering the northern hemisphere and the equatorial region, beyond 2.5-µm to search for evidence of hydration on its surface. Here we show that the observed part of Phaethon does not exhibit the 3-µm hydrated mineral absorption (within 2σ). These observations suggest that Phaethon’s modern activity is not due to volatile sublimation or devolatilization of phyllosilicates on its surface. It is possible that the observed part of Phaethon was originally hydrated and has since lost volatiles from its surface via dehydration, supporting its connection to the Pallas family, or it was formed from anhydrous material. Nature Publishing Group UK 2020-04-28 /pmc/articles/PMC7188859/ /pubmed/32345969 http://dx.doi.org/10.1038/s41467-020-15637-7 Text en © This is a U.S. government work and not under copyright protection in the U.S.; foreign copyright protection may apply 2020 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Takir, Driss
Kareta, Theodore
Emery, Joshua P.
Hanuš, Josef
Reddy, Vishnu
Howell, Ellen S.
Rivkin, Andrew S.
Arai, Tomoko
Near-infrared observations of active asteroid (3200) Phaethon reveal no evidence for hydration
title Near-infrared observations of active asteroid (3200) Phaethon reveal no evidence for hydration
title_full Near-infrared observations of active asteroid (3200) Phaethon reveal no evidence for hydration
title_fullStr Near-infrared observations of active asteroid (3200) Phaethon reveal no evidence for hydration
title_full_unstemmed Near-infrared observations of active asteroid (3200) Phaethon reveal no evidence for hydration
title_short Near-infrared observations of active asteroid (3200) Phaethon reveal no evidence for hydration
title_sort near-infrared observations of active asteroid (3200) phaethon reveal no evidence for hydration
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7188859/
https://www.ncbi.nlm.nih.gov/pubmed/32345969
http://dx.doi.org/10.1038/s41467-020-15637-7
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