Revisiting astronomical crystalline forsterite in the UV to near-IR

Revisiting astronomical crystalline forsterite in the UV to near-IR
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在紫外到近红外范围内重新审视天文晶体镁橄榄石

DOI:
10.5047/eps.2012.05.009
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发表时间:
2013
期刊:
Earth, Planets and Space
影响因子:
--
通讯作者:
A. Speck
A. Speck
中科院分区:
--
文献类型:
--
作者:
K. Pitman;A. Hofmeister;A. Speck

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需要在所有波长下使用诸如镁橄榄石 (Mg2SiO4) 之类的宇宙尘埃物种的光学函数(n 和 k)来量化尘埃的温度和数量。天文学家以不同的方式结合镁橄榄石和橄榄石的光学功能,这将影响辐射传输模型。我们研究了镁橄榄石紫外-可见-近红外 (UV-VIS-NIR) 实验室光谱的最新更新以及镁橄榄石 n、k 数据集的选择对辐射传输模型的影响。我们测量了合成镁橄榄石、MgO、SiO2、橄榄石 (Fo90) 和陨石橄榄石(橄榄石)的 UV-VIS-NIR 透射光谱。我们导出了这些的光学函数,并将我们的 k、吸收截面 <Cabs> 和总通量的 UV-IR 行为与“天文硅酸盐”和橄榄石进行了比较。实验室得出的 k 在 λ ~ 0.2–5 µm 处远低于“天文硅酸盐”k。在红外光谱中,不同的实验室 n 和 k 产生模棱两可的<Cabs>,而“天文硅酸盐”与实验室 n、k 的总通量不同。从 0.35–5 µ m,“镁橄榄石”k 值的选择对建模量影响最大。对于具有显着紫外线通量的环境,天文学家应使用最新的 UV-VIS-NIR 实验室 n、k。
Optical functions (n and k) of cosmic dust species like forsterite (Mg2SiO4) are required at all wavelengths to quantify the temperature and amount of dust. Astronomers combine optical functions of forsterite and olivine in different ways, which will affect radiative transfer models. We investigated what recent updates to the ultraviolet-visible-near-infrared (UV-VIS-NIR) laboratory spectra of forsterite and the choice of forsterite n, k dataset will have on radiative transfer models. We measured the UV-VIS-NIR transmission spectra of synthetic forsterite, MgO, SiO2, olivine (Fo90), and meteoritic olivine (pallasite). We derived optical functions for these and compared the UV-IR behavior of our k, absorption cross-section 〈Cabs〉, and total flux to that of “astronomical silicate” and olivine. Laboratory-derived k is substantially lower than “astronomical silicate” k at λ ~ 0.2–5 µ m. In the IR, different laboratory n and k produce equivocal 〈Cabs〉, whereas total flux is different for “astronomical silicate” versus laboratory n, k. From 0.35–5 µ m, the choice of “forsterite” k values has the most effect on modeled quantities. For environments with significant UV flux, astronomers should use recent UV-VIS-NIR laboratory n, k.
DOI: 10.1051/0004-6361/201015219
发表时间: 2011-02-01
影响因子: 6.5
作者:
Zeidler, S.;Posch, T.;Wehrhan, O.
通讯作者: Wehrhan, O.