Near-infrared spectroscopic characterization of the Pallas family

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F25%3A10511105" target="_blank" >RIV/00216208:11320/25:10511105 - isvavai.cz</a>

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=hMrxjbDT8V" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=hMrxjbDT8V</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1051/0004-6361/202453489" target="_blank" >10.1051/0004-6361/202453489</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Near-infrared spectroscopic characterization of the Pallas family

Popis výsledku v původním jazyce

Context. Asteroid families hold clues to the collisional processes that shaped the Solar System over billions of years. The Pallas collisional family, named after (2) Pallas, is notable for its high orbital inclination and the distinct blue color of Pallas and a few larger B-type family members. While Pallas itself, as one of the largest asteroids, has been studied in detail, most of its smaller family members still remain unexplored. Aims. This study aims to characterize the physical properties of medium- to small-sized Pallas family asteroids to investigate the origin of their unusual blueness. We seek to establish connections between asteroid spectra and meteorite analogs. Additionally, we explore the relationship between the Pallas family and the near-Earth object (NEO) (3200) Phaethon. Methods. We conducted near-infrared (NIR) spectroscopy with the NASA Infrared Telescope Facility (IRTF) to collect reflectance spectra for 22 asteroids, including one from the IRTF Legacy Archive. Spectroscopic and dynamical analyses were carried out to identify outliers, while additional data from NEOWISE and Gaia were incorporated to examine potential correlations among their physical properties. Meteorite analogs were identified through chi(2) matching using samples from the RELAB database. Results. The observed Pallas family asteroids exhibit nearly identical spectral profiles, suggesting a homogeneous composition of ejected material. Small variations in spectral slopes are observed, which may result from different levels of alteration experienced by individual asteroids, with some influence from variations in grain size. Most of the observed spectra of the Pallas asteroids, from 0.8 to 2.2 mu m, closely resemble those of the CY and CI meteorites. The blueness of asteroid surfaces is likely due to the presence of magnetite, troilite, or phyllosilicates, which are products of aqueous alteration. The striking spectral similarity between (3200) Phaethon and Pallas family members of comparable sizes suggests a potential common origin.

Název v anglickém jazyce

Near-infrared spectroscopic characterization of the Pallas family

Popis výsledku anglicky

Context. Asteroid families hold clues to the collisional processes that shaped the Solar System over billions of years. The Pallas collisional family, named after (2) Pallas, is notable for its high orbital inclination and the distinct blue color of Pallas and a few larger B-type family members. While Pallas itself, as one of the largest asteroids, has been studied in detail, most of its smaller family members still remain unexplored. Aims. This study aims to characterize the physical properties of medium- to small-sized Pallas family asteroids to investigate the origin of their unusual blueness. We seek to establish connections between asteroid spectra and meteorite analogs. Additionally, we explore the relationship between the Pallas family and the near-Earth object (NEO) (3200) Phaethon. Methods. We conducted near-infrared (NIR) spectroscopy with the NASA Infrared Telescope Facility (IRTF) to collect reflectance spectra for 22 asteroids, including one from the IRTF Legacy Archive. Spectroscopic and dynamical analyses were carried out to identify outliers, while additional data from NEOWISE and Gaia were incorporated to examine potential correlations among their physical properties. Meteorite analogs were identified through chi(2) matching using samples from the RELAB database. Results. The observed Pallas family asteroids exhibit nearly identical spectral profiles, suggesting a homogeneous composition of ejected material. Small variations in spectral slopes are observed, which may result from different levels of alteration experienced by individual asteroids, with some influence from variations in grain size. Most of the observed spectra of the Pallas asteroids, from 0.8 to 2.2 mu m, closely resemble those of the CY and CI meteorites. The blueness of asteroid surfaces is likely due to the presence of magnetite, troilite, or phyllosilicates, which are products of aqueous alteration. The striking spectral similarity between (3200) Phaethon and Pallas family members of comparable sizes suggests a potential common origin.

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/GA25-16507S" target="_blank" >GA25-16507S: Raný orbitální vývoj planet a výzkum populací asteroidů</a><br>

Návaznosti

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

Rok uplatnění

2025

Kód důvěrnosti údajů

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

Název periodika

Astronomy &amp; Astrophysics

ISSN

0004-6361

e-ISSN

1432-0746

Svazek periodika

695

Číslo periodika v rámci svazku

brezen

Stát vydavatele periodika

FR - Francouzská republika

Počet stran výsledku

10

Strana od-do

A254

Kód UT WoS článku

001452581300001

EID výsledku v databázi Scopus

2-s2.0-105001368477