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Jenniskens, Peter; Wilson, Mike; Packan, Denis; Laux, Christophe O.; Kruger, C.H.; Boyd, Iain D.; Попова, О. П.; Fonda, Mark

doi:10.1023/a:1017017728166

Cited by 37 publications

(16 citation statements)

References 40 publications

(53 reference statements)

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“…Influx is thought to have been much greater at an early stage of our solar system than it is at present. Meteoroids are also regarded as candidates for carrying prebiotic organic matter contributing to the origin of life, so that more knowledge about both the constitution of meteoroids and their alteration during ablation offer keys to the early molecular evolution of our Earth (Jenniskens et al 2000a).…”

Section: Introductionmentioning

confidence: 99%

Metallic abundances of the 2002 Leonid meteor deduced from high-definition TV spectra

Kasuga¹,

Yamamoto

Watanabe³

et al. 2005

A&A

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Abstract. High-definition TV spectra in the ultraviolet-visible region were obtained during the 2002 Leonid aircraft campaign. We analyze the spectra of the brightest fireball that appeared at 03 h 47 m 54 s UT on Nov. 19, 2002 and identify the neutral atoms, mainly MgI, FeI, CaI, and NaI in the observed wavelengths between 300-650 nm. The singly ionized atomic emissions, CaII and MgII lines, also appeared in the spectrum in several epochs during the series of video frames. From analysis of the spectra, time variation in the abundances of metallic atoms, along with their electronic excitation and blackbody temperatures, were obtained assuming the Local Thermal Equilibrium (LTE) condition. Both Fe and Ca abundances relative to Mg are lower than the solar abundance, while Na is slightly higher. We found correlation between the excitation temperature and the abundance of Ca, which suggests incomplete evaporation of the Ca due to intrinsic refractoriness. A search for bands of CHON-related molecules, such as OH and CN, is not successful in the brightest fireball in this study.

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Section: Introductionmentioning

confidence: 99%

Metallic abundances of the 2002 Leonid meteor deduced from high-definition TV spectra

Kasuga¹,

Yamamoto

Watanabe³

et al. 2005

A&A

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“…In order to understand these spectroscopic studies, the first Direct Monte Carlo Simulation model of the meteoric flow field was calculated to describe the rarefied flow conditions prevalent for meteoroids at high altitude (Boyd 2000;Jenniskens et al 2000a). In addition, the process of ablation was studied by traditional fluid dynamics (Popova et al 2000).…”

Section: Meteor Flow Modelmentioning

confidence: 99%

Meteor Storms as a Window on the Delivery of Extraterrestrial Organic Matter to the Early Earth

Jenniskens¹

2004

Symp. - Int. Astron. Union

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The unique rarefied flow and flash heating in meteors creates physical conditions that can change exogenous organic matter into unique prebiotic molecules. With the exception of rare giant comet impacts, most infalling matter at the time of the origin of life was deposited in the atmosphere during the meteor phase. Much new data has been obtained from observations in the Leonid Multi-Instrument Aircraft Campaign; a series of NASA and USAF sponsored Astrobiology missions that explored the 1998-2002 Leonid meteor storms. Here, we provide an overview of some of this recent insight, which provides a framework in which the prebiotic chemistry can be studied.

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“…The meteoroid mass influx is a quantity of interest for several fields, such as aeronomy, planetary science, and astrobiology (Jenniskens et al 1998). Even though there is a worldwide effort to detect meteors (Borovička et al 1999;Lamy et al 2011;Weryk et al 2013;Howie et al 2017), the amount of meteoroid mass entering planet Earth is quite uncertain.…”

Section: Introductionmentioning

confidence: 99%

Luminosity calculation of meteor entry based on detailed flow simulations in the continuum regime

Dias

Scoggins

Magin

2020

A&A

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Context. Composition, mass, and trajectory parameters of meteors can be derived by combining observations with the meteor physics equations. The fidelity of these equations, which rely on heuristic coefficients, significantly affects the accuracy of the properties inferred. Aims. Our objective is to present a methodology that can be used to compute the luminosity of meteor entry based on detailed flow simulations in the continuum regime. Methods. The methodology consists in solving the Navier-Stokes equations using state-of-the-art physico-chemical models for hypersonic flows. It includes accurate boundary conditions to simulate the surface evaporation of the molten material and coupled flow-radiation effects. Such detailed simulations allow for the calculation of heat-transfer coefficients and luminous efficiency, which can be incorporated into the meteor physics equations. Finally, we integrate the radiative transfer equation over a line of sight from the ground to the meteor to derive the luminosity magnitude. Results. We use the developed methodology to simulate the Lost City bolide and to derive the luminosity magnitude, obtaining good agreement between numerical results and observations. The computed color index is more prominent than the observations. This is attributed to a lack of refractory elements such as Ca in the modeled flow that might originate from the vaporization of droplets in the trail, a phenomenon currently not included in the model.

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Untitled

Cited by 37 publications

References 40 publications

Metallic abundances of the 2002 Leonid meteor deduced from high-definition TV spectra

Metallic abundances of the 2002 Leonid meteor deduced from high-definition TV spectra

Meteor Storms as a Window on the Delivery of Extraterrestrial Organic Matter to the Early Earth

Luminosity calculation of meteor entry based on detailed flow simulations in the continuum regime

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