(16) Psyche: A mesosiderite-like asteroid?

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F18%3A10385767" target="_blank" >RIV/00216208:11320/18:10385767 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1051/0004-6361/201834091" target="_blank" >https://doi.org/10.1051/0004-6361/201834091</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1051/0004-6361/201834091" target="_blank" >10.1051/0004-6361/201834091</a>

Jazyk výsledku

angličtina

Název v původním jazyce

(16) Psyche: A mesosiderite-like asteroid?

Popis výsledku v původním jazyce

Context. Asteroid (16) Psyche is the target of the NASA Psyche mission. It is considered one of the few main-belt bodies that could be an exposed proto-planetary metallic core and that would thus be related to iron meteorites. Such an association is however challenged by both its near- and mid-infrared spectral properties and the reported estimates of its density. Aims. Here, we aim to refine the density of (16) Psyche to set further constraints on its bulk composition and determine its potential meteoritic analog. Methods. We observed (16) Psyche with ESO VLT/SPHERE/ZIMPOL as part of our large program (ID 199.C-0074). We used the high angular resolution of these observations to refine Psyche&apos;s three-dimensional (3D) shape model and subsequently its density when combined with the most recent mass estimates. In addition, we searched for potential companions around the asteroid. Results. We derived a bulk density of 3.99 +/- 0.26 g cm(-3) for Psyche. While such density is incompatible at the 3-sigma level with any iron meteorites (similar to 7.8 g cm(-3)), it appears fully consistent with that of stony-iron meteorites such as mesosiderites (density similar to 4.25 g cm(-3)). In addition, we found no satellite in our images and set an upper limit on the diameter of any non-detected satellite of 1460 +/- 200 m at 150 km from Psyche (0.2% x R-Hill, the Hill radius) and 800 +/- 200 m at 2000 km (3% x R-Hill). Conclusions. Considering that the visible and near-infrared spectral properties of mesosiderites are similar to those of Psyche, there is merit to a long-published initial hypothesis that Psyche could be a plausible candidate parent body for mesosiderites.

Název v anglickém jazyce

(16) Psyche: A mesosiderite-like asteroid?

Popis výsledku anglicky

Context. Asteroid (16) Psyche is the target of the NASA Psyche mission. It is considered one of the few main-belt bodies that could be an exposed proto-planetary metallic core and that would thus be related to iron meteorites. Such an association is however challenged by both its near- and mid-infrared spectral properties and the reported estimates of its density. Aims. Here, we aim to refine the density of (16) Psyche to set further constraints on its bulk composition and determine its potential meteoritic analog. Methods. We observed (16) Psyche with ESO VLT/SPHERE/ZIMPOL as part of our large program (ID 199.C-0074). We used the high angular resolution of these observations to refine Psyche&apos;s three-dimensional (3D) shape model and subsequently its density when combined with the most recent mass estimates. In addition, we searched for potential companions around the asteroid. Results. We derived a bulk density of 3.99 +/- 0.26 g cm(-3) for Psyche. While such density is incompatible at the 3-sigma level with any iron meteorites (similar to 7.8 g cm(-3)), it appears fully consistent with that of stony-iron meteorites such as mesosiderites (density similar to 4.25 g cm(-3)). In addition, we found no satellite in our images and set an upper limit on the diameter of any non-detected satellite of 1460 +/- 200 m at 150 km from Psyche (0.2% x R-Hill, the Hill radius) and 800 +/- 200 m at 2000 km (3% x R-Hill). Conclusions. Considering that the visible and near-infrared spectral properties of mesosiderites are similar to those of Psyche, there is merit to a long-published initial hypothesis that Psyche could be a plausible candidate parent body for mesosiderites.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

<a href="/cs/project/GA18-09470S" target="_blank" >GA18-09470S: Modely tvarů velkých planetek z VLT/SPHERE dat</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2018

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Astronomy &amp; Astrophysics [online]

ISSN

1432-0746

e-ISSN

—

Svazek periodika

619

Číslo periodika v rámci svazku

Neuveden

Stát vydavatele periodika

FR - Francouzská republika

Počet stran výsledku

10

Strana od-do

—

Kód UT WoS článku

000449725500001

EID výsledku v databázi Scopus

2-s2.0-85056511149