Spectral ratioing of Afρ to constrain the dust particle size distribution of comets

IF 1.8 4区物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS

Planetary and Space Science Pub Date : 2024-06-07 DOI:10.1016/j.pss.2024.105925

Nico Haslebacher , Nicolas Thomas , Raphael Marschall

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Abstract

A numerical model of cometary dust environments is used to gain a deeper understanding of the relationship between the brightness ( $A f ρ$ ) and the dust particle size distribution in the coma. Specifically, the spectral ratio of $A f ρ$ (425 nm) $/$ $A f ρ$ (900 nm) is modelled for a wide range of parameters and tied to the power-law index. The studied parameters are dust composition, terminal outflow velocity and the dust production rate day–night asymmetry. We find that the spectral ratio of $A f ρ$ modelled at 425 nm and 900 nm correlates with the power-law index of the particle size distribution. This method could be used to place constraints on the dust size distributions of comets and as a result improve the use of $A f ρ$ as a proxy for cometary activity. Optically red dust indicates that the scattering is dominated by large particles.

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利用Afρ的光谱比值来确定彗星尘埃粒径分布

利用彗星尘埃环境的数值模型来深入了解亮度（Afρ）与彗星尘埃粒径分布之间的关系。具体来说，模拟了多种参数下 Afρ(425 nm)/ Afρ(900nm)的光谱比，并将其与幂律指数联系起来。研究的参数包括尘埃成分、末端流出速度和尘埃产生率的昼夜不对称。我们发现，425 nm 和 900 nm 处建模的 Afρ 光谱比与粒径分布的幂律指数相关。这种方法可用于对彗星的尘埃粒度分布进行约束，从而改进用Afρ来代表彗星活动的方法。光学红色尘埃表明散射主要由大颗粒产生。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Planetary and Space Science 地学天文-天文与天体物理

CiteScore

5.40

自引率

4.20%

发文量

126

审稿时长

15 weeks

期刊介绍： Planetary and Space Science publishes original articles as well as short communications (letters). Ground-based and space-borne instrumentation and laboratory simulation of solar system processes are included. The following fields of planetary and solar system research are covered: • Celestial mechanics, including dynamical evolution of the solar system, gravitational captures and resonances, relativistic effects, tracking and dynamics • Cosmochemistry and origin, including all aspects of the formation and initial physical and chemical evolution of the solar system • Terrestrial planets and satellites, including the physics of the interiors, geology and morphology of the surfaces, tectonics, mineralogy and dating • Outer planets and satellites, including formation and evolution, remote sensing at all wavelengths and in situ measurements • Planetary atmospheres, including formation and evolution, circulation and meteorology, boundary layers, remote sensing and laboratory simulation • Planetary magnetospheres and ionospheres, including origin of magnetic fields, magnetospheric plasma and radiation belts, and their interaction with the sun, the solar wind and satellites • Small bodies, dust and rings, including asteroids, comets and zodiacal light and their interaction with the solar radiation and the solar wind • Exobiology, including origin of life, detection of planetary ecosystems and pre-biological phenomena in the solar system and laboratory simulations • Extrasolar systems, including the detection and/or the detectability of exoplanets and planetary systems, their formation and evolution, the physical and chemical properties of the exoplanets • History of planetary and space research