Spectroscopic analysis of hydrogen and silicon in bright fireballs: New insights into meteoroid composition

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F25%3A00643786" target="_blank" >RIV/67985815:_____/25:00643786 - isvavai.cz</a>

Výsledek na webu

<a href="https://hdl.handle.net/11104/0373775" target="_blank" >https://hdl.handle.net/11104/0373775</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1051/0004-6361/202556816" target="_blank" >10.1051/0004-6361/202556816</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Spectroscopic analysis of hydrogen and silicon in bright fireballs: New insights into meteoroid composition

Popis výsledku v původním jazyce

We present a study of the high-temperature spectral component in meteor fireballs, with a particular focus on neutral hydrogen (H alpha at 656.28 nm) and ionised silicon (Si II-2 doublet at 634.71 nm and 637.14 nm). By analysing spectra from the European Fireball Network (EN) that exhibit H alpha and Si II-2 emissions, we investigated the relationship between hydrogen and silicon abundances across different meteoroid types. The plasma temperature of the high-temperature component remains independent of meteor velocity. This allows us to directly compare relative intensities of hydrogen, bound in more volatile materials, with silicon, bound in less volatile materials, in bodies with different velocities.Methods. We analysed 31 meteor spectra from the EN, focusing on H alpha (656.28 nm) and Si II-2 (634.71 nm, 637.14 nm) emissions to determine the elemental abundances and their relationships with the meteor parameters. The spectroscopic data were reduced following established procedures to derive the line intensities. We employed direct line integration and applied ionisation corrections through Saha equations to estimate the relative atomic abundances.Results. Our results confirmed that the H/Si value remains largely independent of meteor velocity. We show a positive correlation with photometric mass for cometary meteoroids, suggesting that larger bodies better preserve their volatile content, namely hydrogen. This correlation persists across the meteor showers, showing a physical process related to volatile preservation rather than specific parent body composition. Our data suggest that the abundance of hydrogen in large cometary meteoroids is not only higher than in CI chondrites, but is also comparable to or higher than the measured abundances in small particles of dust from Halley's comet, depending on the assumed plasma conditions. This work brought new constraints on the distribution and preservation of volatile elements in Solar System bodies and new insights into the potential delivery mechanisms of water to Earth.Conclusions. The H/Si values show no correlation with meteor velocity, but increase with photometric mass for cometary meteoroids. The prevalence of hydrogen in larger cometary meteoroids supports models where comets could be significant contributors to Earth's volatile inventory.

Název v anglickém jazyce

Spectroscopic analysis of hydrogen and silicon in bright fireballs: New insights into meteoroid composition

Popis výsledku anglicky

We present a study of the high-temperature spectral component in meteor fireballs, with a particular focus on neutral hydrogen (H alpha at 656.28 nm) and ionised silicon (Si II-2 doublet at 634.71 nm and 637.14 nm). By analysing spectra from the European Fireball Network (EN) that exhibit H alpha and Si II-2 emissions, we investigated the relationship between hydrogen and silicon abundances across different meteoroid types. The plasma temperature of the high-temperature component remains independent of meteor velocity. This allows us to directly compare relative intensities of hydrogen, bound in more volatile materials, with silicon, bound in less volatile materials, in bodies with different velocities.Methods. We analysed 31 meteor spectra from the EN, focusing on H alpha (656.28 nm) and Si II-2 (634.71 nm, 637.14 nm) emissions to determine the elemental abundances and their relationships with the meteor parameters. The spectroscopic data were reduced following established procedures to derive the line intensities. We employed direct line integration and applied ionisation corrections through Saha equations to estimate the relative atomic abundances.Results. Our results confirmed that the H/Si value remains largely independent of meteor velocity. We show a positive correlation with photometric mass for cometary meteoroids, suggesting that larger bodies better preserve their volatile content, namely hydrogen. This correlation persists across the meteor showers, showing a physical process related to volatile preservation rather than specific parent body composition. Our data suggest that the abundance of hydrogen in large cometary meteoroids is not only higher than in CI chondrites, but is also comparable to or higher than the measured abundances in small particles of dust from Halley's comet, depending on the assumed plasma conditions. This work brought new constraints on the distribution and preservation of volatile elements in Solar System bodies and new insights into the potential delivery mechanisms of water to Earth.Conclusions. The H/Si values show no correlation with meteor velocity, but increase with photometric mass for cometary meteoroids. The prevalence of hydrogen in larger cometary meteoroids supports models where comets could be significant contributors to Earth's volatile inventory.

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/GA24-10143S" target="_blank" >GA24-10143S: Podrobný pohled na vlastnosti meteorických rojů</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2025

Kód důvěrnosti údajů

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

Název periodika

Astronomy & Astrophysics

ISSN

0004-6361

e-ISSN

1432-0746

Svazek periodika

704

Číslo periodika v rámci svazku

Dec.

Stát vydavatele periodika

FR - Francouzská republika

Počet stran výsledku

16

Strana od-do

A241

Kód UT WoS článku

001643295900006

EID výsledku v databázi Scopus

2-s2.0-105025662333