Revisiting astronomical crystalline forsterite in the UV to near-IR
Revisiting astronomical crystalline forsterite in the UV to near-IR
复制标题
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:
影响因子:
--
通讯作者:
A. Speck
中科院分区:
文献类型:
--
作者:
K. Pitman;A. Hofmeister;A. Speck
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.
影响因子:
6.5
作者:
Zeidler, S.;Posch, T.;Wehrhan, O.
通讯作者:
Wehrhan, O.