Revisiting the particle-size constraint of the 10-μm silicate feature

被引：5

作者：

Chornaya, Ekaterina ^{[1
,2
]}

Zakharenko, Alexander M. ^{[1
]}

Zubko, Evgenij ^{[3
]}

Kuchmizhak, Aleksandr ^{[4
]}

Golokhvast, Kirill S. ^{[1
]}

Videen, Gorden ^{[5
,6
]}

机构：

[1] Far Eastern Fed Univ, 8 Sukhanova St, Vladivostok 690950, Russia

[2] RAS, Inst Appl Astron, 10 Kutuzova Emb, St Petersburg 191187, Russia

[3] Kyung Hee Univ, Humanitas Coll, 1732 Deogyeong Daero, Yongin 17104, Gyeonggi Do, South Korea

[4] RAS, Inst Automat & Control Proc FEB, 5 Radio St, Vladivostok 690041, Russia

[5] Space Sci Inst, 4750 Walnut St,Suite 205, Boulder, CO 80301 USA

[6] Kyung Hee Univ, Dept Astron & Space Sci, 1732 Deogyeong Daero, Yongin 17104, Gyeonggi Do, South Korea

来源：

ICARUS | 2020年 / 350卷

关键词：

Mid-IR emission; 10-mu m silicate feature; Olivine; experiment; O1; HALE-BOPP; DUST PROPERTIES; COMA; EMISSION; COMETS; SPECTRA; POLARIZATION; MINERALOGY; OLIVINE; ANALOGS;

D O I：

10.1016/j.icarus.2020.113907

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We experimentally measure the mid-IR spectra of half-millimeter-sized olivine particles with very compact morphology and smooth surfaces. We find that the 10-mu m silicate feature is present in these large, irregularly shaped samples having surface roughness that is much smaller than optical wavelengths. Based on Mie theory, which assumes the particles are spherical, this feature should not exist for such large particles. As a consequence, its presence has been taken as an indicator that the particles or grains composing such particles were micronsized or smaller. The measurement of this feature in real, irregularly shaped particles, suggests that the assumption of sphericity may severely limit our interpretations of remote-sensing data.

引用

页数：6