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The dust coma of Comet P/Giacobini-Zinner in the infrared
The Astronomical Journal ( IF 5.3 ) Pub Date : 1992-07-01 , DOI: 10.1086/116245
M S Hanner 1 , G J Veeder , A T Tokunaga
Affiliation  

We present 1-20 micrometers photometry of P/Giacobini-Zinner obtained at the NASA Infrared Telescope Facility, during 1985 June-September (r = 1.57-1.03 AU). A broad, weak 10 micrometers silicate emission feature was detected on August 26.6; a similar weak emission feature could have been hidden in the broadband photometry on other dates. The total scattering and emitting cross section of dust in the inner coma was similar to that in other short-period comets, but a factor of 10 (r = 1.56 AU) to 100 (r = 1.03 AU) lower than the amount of dust in Comet Halley. The thermal emission continuum can be fit with models weighted toward either small or large absorbing grains. The dust production rate near perihelion was approximately 10(5) g/s (small-grain model) to approximately 10(6) g/s (large-grain model). The corresponding dust/gas mass ratio on August 26 was approximately 0.1-1. A silicate-rich heterogeneous grain model with an excess of large particles is compatible with the observed spectrum of Giacobini-Zinner on August 26. Thus, weak or absent silicate emission does not necessarily imply an absence of silicates in the dust, although the abundance of silicate particles < or = 1 micrometer radius must have been lower than in Comet Halley.

中文翻译:

P/Giacobini-Zinner 彗星在红外波段的尘埃彗发

我们展示了 1985 年 6 月至 9 月期间在美国宇航局红外望远镜设施获得的 P/Giacobini-Zinner 的 1-20 微米光度计(r = 1.57-1.03 AU)。8 月 26.6 日检测到一个广泛的、弱的 10 微米硅酸盐发射特征;在其他日期的宽带测光中可能隐藏了类似的弱发射特征。内部彗发中尘埃的总散射和发射截面与其他短周期彗星相似,但比彗发中尘埃量低 10 (r = 1.56 AU) 到 100 (r = 1.03 AU) 的系数。哈雷彗星。热发射连续体可以与偏重于小吸收颗粒或大吸收颗粒的模型拟合。近日点附近的粉尘产生率大约为 10(5) g/s(小颗粒模型)到大约 10(6) g/s(大颗粒模型)。8 月 26 日相应的粉尘/气体质量比约为 0.1-1。具有过量大颗粒的富含硅酸盐的异质颗粒模型与 8 月 26 日观测到的贾科比尼-津纳光谱兼容。 因此,微弱或没有硅酸盐发射并不一定意味着尘埃中不存在硅酸盐,尽管半径 < 或 = 1 微米的硅酸盐颗粒一定比哈雷彗星中的小。
更新日期:1992-07-01
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