Pre-perihelion activity of comet 67P/Churyumov-Gerasimenko
Pre-perihelion activity of comet 67P/Churyumov-Gerasimenko
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67P/Churyumov-Gerasimenko 彗星近日点前的活动
DOI：
10.1051/0004-6361/201424186
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发表时间：
2014
影响因子：
6.5
通讯作者：
Guilbert-Lepoutre A
中科院分区：
文献类型：
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作者：
Guilbert-Lepoutre A
背景人们相信彗星保存着太阳系形成和演化过程中发生的物理和化学过程的相对原始的记录。因此，对这些小天体的彻底研究，例如欧空局/罗塞塔基石任务将要进行的小天体，应该会对太阳系的起源带来强大而独特的限制。 目标 由于彗星 67P/Churyumov-Gerasimenko 最近才被选为欧空局/罗塞塔任务的目标，因此几乎没有机会研究其近日点前的活动。然而，这一阶段对于任务来说非常重要，因为核的全球测绘和菲莱着陆点的选择将在近日点前阶段进行。在此，我们报告了 2008 年 5 月至 9 月期间观测到的这颗彗星最后一次近日点前经过的未发表数据。方法分别通过可见光谱和宽带成像研究了 67P/Churyumov-Gerasimenko 彗星的气体和尘埃活动，覆盖了 2.99 至 2.22 天文单位之间的一系列近日点前日心距离。结果我们收集的数据 尘埃活动的结果与其他作者观察到的趋势一致，并且显示出轨道近日点之前和之后的强烈不对称性。由于挥发物的发射，光谱没有显示任何谱线，并且其生产率的上限通常比等效的近日点后日心距离低一个数量级。近日点前和近日点后活动的不对称可能是由于尘埃地壳淬灭了 67P 表面的活动。我们估计该地壳的厚度约为 12 厘米，但表面并不均匀。即使没有单独检测到气体，慧发表面亮度分布也可能表明彗星实际到达近日点之前释放的气体物质可能受到污染。
ContextComets are believed to hold a relatively pristine record of the physical and chemical processes that occurred during the formation and evolution of the solar system. Thorough investigations of these small bodies, such as the one that will be performed by the ESA/Rosetta cornerstone mission, are thus supposed to bring strong and unique constraints on the origins of the solar system.AimsBecause comet 67P/Churyumov-Gerasimenko was only recently selected as the target for the ESA/Rosetta mission, there has been little opportunity to study its pre-perihelion activity. This phase is, however, very important for the mission, since the global mapping of the nucleus and the choice of landing site for Philae will be performed during this pre-perihelion phase. Here, we report previously unpublished data of the last pre-perihelion passage of this comet, observed between May and September 2008.MethodsThe gas and dust activity of comet 67P/Churyumov-Gerasimenko are studied through visible spectroscopy and broadband imaging, respectively, covering a range of pre-perihelion heliocentric distances between 2.99 and 2.22 AU.ResultsThe data we have gathered on the dust activity are consistent with trends observed by other authors and show a strong asymmetry between the pre- and post-perihelion phases of the orbit. The spectra do not show any lines due to the emission of volatiles, and upper limits on their production rates are typically one order of magnitude lower than at the equivalent post-perihelion heliocentric distances. The asymmetry in the pre- and post-perihelion phases of the activity may be due to a dusty crust quenching the activity at the surface of 67P. We estimate that this crust could be about 12 cm thick, although not uniform across the surface. Even if no gas is individually detected, the coma surface brightness profiles might indicate a possible contamination from gaseous species emitted before the comet actually reaches perihelion.
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2003年2月20日至4月20日彗星67P/Churyumov-Gerasimenko的尘埃活动
DOI：
10.1007/s11038-006-9067-9
发表时间：
2005
期刊：
Earth, Moon, and Planets
影响因子：
--
作者：
L. Lara;J. Leon;J. Licandro;P. Gutiérrez
通讯作者：
P. Gutiérrez
哈勃太空望远镜对 67P/Churyumov-Gerasimenko 彗星的核心和内部彗发的观测
影响因子：
6.5
作者：
P. Lamy;I. Tóth;H. Weaver;L. Jorda;M. Kaasalainen;P. Gutiérrez
通讯作者：
P. Gutiérrez
2009 年近日点之前 67P/Churyumov-Gerasimenko 彗星中尘埃彗发的演化
影响因子：
6.5
作者：
G. Tozzi;P. Patriarchi;H. Boehnhardt;J. Vincent;J. Licandro;L. Kolokolova;R. Schulz;J. Stuwe
通讯作者：
J. Stuwe
影响因子：
6.5
作者：
C. Snodgrass;C. Tubiana;D. Bramich;K. Meech;H. Boehnhardt;L. Barrera
通讯作者：
C. Snodgrass;C. Tubiana;D. Bramich;K. Meech;H. Boehnhardt;L. Barrera
距太阳 5.5–4.3 天文单位的斯皮策彗星 67P/Churyumov-Gerasimenko 观测
DOI：
10.1088/0004-6256/137/6/4633
发表时间：
2009
期刊：
The Astronomical Journal
影响因子：
--
作者：
M. Kelley;D. Wooden;C. Tubiana;H. Boehnhardt;C. Woodward;D. Harker
通讯作者：
D. Harker