文章基本信息

标题：Zodiacal Light Beyond Earth Orbit Observed with Pioneer 10
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作者：T. Matsumoto ; K. Tsumura ; Y. Matsuoka 等
期刊名称：The Astronomical journal
印刷版ISSN：0004-6256
电子版ISSN：1538-3881
出版年度：2018
卷号：156
期号：3
页码：1-6
DOI：10.3847/1538-3881/aad0f0
语种：English
出版社：American Institute of Physics
摘要：We reanalyze the Imaging Photopolarimeter data from Pioneer 10 to study the zodiacal light in the B and R bandsbeyond Earth orbit, applying an improved method to subtract integrated star light (ISL) and diffuse Galactic light(DGL). We found that there exists a significant instrumental offset, making it difficult to examine the absolute skybrightness. Instead, we analyzed the differential brightness, i.e., the difference in sky brightness from the average athigh ecliptic latitude, and compared with that expected from the model zodiacal light. At a heliocentric distance ofr<2au, we found a fairly good correlation between the J-band model zodiacal light and the residual skybrightness after subtracting the ISL and DGL. The reflectances of the interplanetary dust derived from thecorrelation study are marginally consistent with previous works. The zodiacal light is not significantly detectable atr>3au, as previously reported. However, a clear discrepancy from the model is found at r=2.94 au whichindicates the existence of a local dust cloud produced by the collision of asteroids or dust trail from active asteroids(or main-belt comets). Our result confirms that the main component of the zodiacal light (smooth cloud) isconsistent with the model even beyond the earth orbit, which justifies the detection of the extragalactic backgroundlight after subtracting the zodiacal light based on the model.
关键词：zodiacal dust;interplanetary medium;minor planets;asteroids: general