Evidence for differentiation of the most primitive small bodies
Carri, B., et al. [Context] Dynamical models of Solar System evolution have suggested that the so-called P- and D-type volatile-rich asteroids formed in the outer Solar System beyond Neptune's orbit and may be genetically related to the Jupiter Trojans, comets, and small Kuiper belt objects (KB...
Published in: | Astronomy & Astrophysics |
---|---|
Main Authors: | , , |
Other Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
EDP Sciences
2021
|
Subjects: | |
Online Access: | http://hdl.handle.net/10261/256601 https://doi.org/10.1051/0004-6361/202140342 https://doi.org/10.13039/501100002809 https://doi.org/10.13039/100000001 |
id |
ftcsic:oai:digital.csic.es:10261/256601 |
---|---|
record_format |
openpolar |
spelling |
ftcsic:oai:digital.csic.es:10261/256601 2024-02-11T10:09:03+01:00 Evidence for differentiation of the most primitive small bodies Carry, B. Santana-Ros, T. Yang, B. Czech Science Foundation Charles University (Czech Republic) Generalitat de Catalunya Ministerio de Ciencia, Innovación y Universidades (España) National Science Foundation (US) 2021-06-17 http://hdl.handle.net/10261/256601 https://doi.org/10.1051/0004-6361/202140342 https://doi.org/10.13039/501100002809 https://doi.org/10.13039/100000001 unknown EDP Sciences #PLACEHOLDER_PARENT_METADATA_VALUE# info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/RTI2018-095076-B-C21/ES/LOS DATOS DE GAIA PARA LAS PROXIMAS DECADAS II/ Publisher's version http://doi.org/10.1051/0004-6361/202140342 Sí doi:10.1051/0004-6361/202140342 issn: 1432-0746 Astronomy and Astrophysics 650: A129 (2021) http://hdl.handle.net/10261/256601 http://dx.doi.org/10.13039/501100002809 http://dx.doi.org/10.13039/100000001 open Minor plantes Asteroids: general Kuiper belt: general Asteroids: individual: Sylvia artículo http://purl.org/coar/resource_type/c_6501 2021 ftcsic https://doi.org/10.1051/0004-6361/20214034210.13039/50110000280910.13039/100000001 2024-01-16T11:16:45Z Carri, B., et al. [Context] Dynamical models of Solar System evolution have suggested that the so-called P- and D-type volatile-rich asteroids formed in the outer Solar System beyond Neptune's orbit and may be genetically related to the Jupiter Trojans, comets, and small Kuiper belt objects (KBOs). Indeed, the spectral properties of P- and D-type asteroids resemble that of anhydrous cometary dust. Aims. We aim to gain insights into the above classes of bodies by characterizing the internal structure of a large P- and D-type asteroid. [Methods] We report high-angular-resolution imaging observations of the P-type asteroid (87) Sylvia with the Very Large Telescope Spectro-Polarimetric High-contrast Exoplanet REsearch (SPHERE) instrument. These images were used to reconstruct the 3D shape of Sylvia. Our images together with those obtained in the past with large ground-based telescopes were used to study the dynamics of its two satellites. We also modeled Sylvia's thermal evolution. [Results] The shape of Sylvia appears flattened and elongated (a/b 1.45; a/c 1.84). We derive a volume-equivalent diameter of 271 ± 5 km and a low density of 1378 ± 45 kg m-3. The two satellites orbit Sylvia on circular, equatorial orbits. The oblateness of Sylvia should imply a detectable nodal precession which contrasts with the fully-Keplerian dynamics of its two satellites. This reveals an inhomogeneous internal structure, suggesting that Sylvia is differentiated. [Conclusions] Sylvia's low density and differentiated interior can be explained by partial melting and mass redistribution through water percolation. The outer shell should be composed of material similar to interplanetary dust particles (IDPs) and the core should be similar to aqueously altered IDPs or carbonaceous chondrite meteorites such as the Tagish Lake meteorite. Numerical simulations of the thermal evolution of Sylvia show that for a body of such a size, partial melting was unavoidable due to the decay of long-lived radionuclides. In addition, we show that bodies ... Article in Journal/Newspaper Tagish Digital.CSIC (Spanish National Research Council) Jupiter ENVELOPE(101.133,101.133,-66.117,-66.117) Tagish ENVELOPE(-134.272,-134.272,60.313,60.313) Tagish Lake ENVELOPE(-134.233,-134.233,59.717,59.717) Astronomy & Astrophysics 650 A129 |
institution |
Open Polar |
collection |
Digital.CSIC (Spanish National Research Council) |
op_collection_id |
ftcsic |
language |
unknown |
topic |
Minor plantes Asteroids: general Kuiper belt: general Asteroids: individual: Sylvia |
spellingShingle |
Minor plantes Asteroids: general Kuiper belt: general Asteroids: individual: Sylvia Carry, B. Santana-Ros, T. Yang, B. Evidence for differentiation of the most primitive small bodies |
topic_facet |
Minor plantes Asteroids: general Kuiper belt: general Asteroids: individual: Sylvia |
description |
Carri, B., et al. [Context] Dynamical models of Solar System evolution have suggested that the so-called P- and D-type volatile-rich asteroids formed in the outer Solar System beyond Neptune's orbit and may be genetically related to the Jupiter Trojans, comets, and small Kuiper belt objects (KBOs). Indeed, the spectral properties of P- and D-type asteroids resemble that of anhydrous cometary dust. Aims. We aim to gain insights into the above classes of bodies by characterizing the internal structure of a large P- and D-type asteroid. [Methods] We report high-angular-resolution imaging observations of the P-type asteroid (87) Sylvia with the Very Large Telescope Spectro-Polarimetric High-contrast Exoplanet REsearch (SPHERE) instrument. These images were used to reconstruct the 3D shape of Sylvia. Our images together with those obtained in the past with large ground-based telescopes were used to study the dynamics of its two satellites. We also modeled Sylvia's thermal evolution. [Results] The shape of Sylvia appears flattened and elongated (a/b 1.45; a/c 1.84). We derive a volume-equivalent diameter of 271 ± 5 km and a low density of 1378 ± 45 kg m-3. The two satellites orbit Sylvia on circular, equatorial orbits. The oblateness of Sylvia should imply a detectable nodal precession which contrasts with the fully-Keplerian dynamics of its two satellites. This reveals an inhomogeneous internal structure, suggesting that Sylvia is differentiated. [Conclusions] Sylvia's low density and differentiated interior can be explained by partial melting and mass redistribution through water percolation. The outer shell should be composed of material similar to interplanetary dust particles (IDPs) and the core should be similar to aqueously altered IDPs or carbonaceous chondrite meteorites such as the Tagish Lake meteorite. Numerical simulations of the thermal evolution of Sylvia show that for a body of such a size, partial melting was unavoidable due to the decay of long-lived radionuclides. In addition, we show that bodies ... |
author2 |
Czech Science Foundation Charles University (Czech Republic) Generalitat de Catalunya Ministerio de Ciencia, Innovación y Universidades (España) National Science Foundation (US) |
format |
Article in Journal/Newspaper |
author |
Carry, B. Santana-Ros, T. Yang, B. |
author_facet |
Carry, B. Santana-Ros, T. Yang, B. |
author_sort |
Carry, B. |
title |
Evidence for differentiation of the most primitive small bodies |
title_short |
Evidence for differentiation of the most primitive small bodies |
title_full |
Evidence for differentiation of the most primitive small bodies |
title_fullStr |
Evidence for differentiation of the most primitive small bodies |
title_full_unstemmed |
Evidence for differentiation of the most primitive small bodies |
title_sort |
evidence for differentiation of the most primitive small bodies |
publisher |
EDP Sciences |
publishDate |
2021 |
url |
http://hdl.handle.net/10261/256601 https://doi.org/10.1051/0004-6361/202140342 https://doi.org/10.13039/501100002809 https://doi.org/10.13039/100000001 |
long_lat |
ENVELOPE(101.133,101.133,-66.117,-66.117) ENVELOPE(-134.272,-134.272,60.313,60.313) ENVELOPE(-134.233,-134.233,59.717,59.717) |
geographic |
Jupiter Tagish Tagish Lake |
geographic_facet |
Jupiter Tagish Tagish Lake |
genre |
Tagish |
genre_facet |
Tagish |
op_relation |
#PLACEHOLDER_PARENT_METADATA_VALUE# info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/RTI2018-095076-B-C21/ES/LOS DATOS DE GAIA PARA LAS PROXIMAS DECADAS II/ Publisher's version http://doi.org/10.1051/0004-6361/202140342 Sí doi:10.1051/0004-6361/202140342 issn: 1432-0746 Astronomy and Astrophysics 650: A129 (2021) http://hdl.handle.net/10261/256601 http://dx.doi.org/10.13039/501100002809 http://dx.doi.org/10.13039/100000001 |
op_rights |
open |
op_doi |
https://doi.org/10.1051/0004-6361/20214034210.13039/50110000280910.13039/100000001 |
container_title |
Astronomy & Astrophysics |
container_volume |
650 |
container_start_page |
A129 |
_version_ |
1790608767652462592 |