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arXiv 1202.3657astro-ph.EP
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TNO是冷的:海王星外区域的巡天V.18个冥王星的物理特征用Herschel PACS观测

TNOs are Cool: A survey of the trans-Neptunian region V. Physical characterization of 18 Plutinos using Herschel PACS observations

Michael Mommert, A. W. Harris, C. Kiss, A. Pal, P. Santos-Sanz, J. Stansberry, A. Delsanti, E. Vilenius, T. G. Mueller, N. Peixinho, E. Lellouch, N. Szalai, F. … 展开作者

Michael Mommert, A. W. Harris, C. Kiss, A. Pal, P. Santos-Sanz, J. Stansberry, A. Delsanti, E. Vilenius, T. G. Mueller, N. Peixinho, E. Lellouch, N. Szalai, F. Henry, R. Duffard, S. Fornasier, P. Hartogh, M. Mueller, J. L. Ortiz, S. Protopapa, M. Rengel, A. Thirouin

摘要:

我们提出了赫歇尔PACS测光的18个冥王星,并确定这些对象的大小和热模拟。我们分析我们的结果的相关性,得出结论的普卢蒂诺尺寸分布,并与早期的结果。通量密度来自PACS迷你扫描地图,使用专门的数据减少和测光方法。为了提高我们的结果的质量,我们结合我们的PACS数据与现有的斯皮策MIPS数据在可能的情况下,并完善现有的绝对星等的目标。我们的样品的物理表征是使用热模型完成的。使用定制的Monte Carlo方法导出物理参数的不确定性。使用bootstrap Spearman秩分析进行相关性分析。我们发现我们的冥王星的大小范围从150到730公里,几何半径在0.04到0.28之间变化。样本的平均散射度为0.08 \pm 0.03,与半人马座、木星族彗星和其他海王星外天体的平均散射度相当。我们能够首次校准普卢蒂诺尺度,并发现累积普卢蒂诺尺度分布最适合使用累积幂律,在120-400 km的尺度范围内q = 2,在更大的尺度范围内q = 3。我们修正了1999 TC 36的体积密度,发现密度为0.64(+0.15/-0.11)g cm-3。根据修改后的斯皮尔曼等级分析技术,我们的Plutino样本似乎在物体大小方面有偏差,但在反照率方面没有偏差。此外,我们在样本中发现了基于几何方面和颜色的偏见。有定性的证据表明,冰冷的冥王星具有比样本平均值更高的温度。

英文摘要:

We present Herschel PACS photometry of 18 Plutinos and determine sizes and albedos for these objects using thermal modeling. We analyze our results for correlations, draw conclusions on the Plutino size distribution, and compare to earlier results. Flux densities are derived from PACS mini scan-maps using specialized data reduction and photometry methods. In order to improve the quality of our results, we combine our PACS data with existing Spitzer MIPS data where possible, and refine existing absolute magnitudes for the targets. The physical characterization of our sample is done using a thermal model. Uncertainties of the physical parameters are derived using customized Monte Carlo methods. The correlation analysis is performed using a bootstrap Spearman rank analysis. We find the sizes of our Plutinos to range from 150 to 730 km and geometric albedos to vary between 0.04 and 0.28. The average albedo of the sample is 0.08 \pm 0.03, which is comparable to the mean albedo of Centaurs, Jupiter Family comets and other Trans-Neptunian Objects. We were able to calibrate the Plutino size scale for the first time and find the cumulative Plutino size distribution to be best fit using a cumulative power law with q = 2 at sizes ranging from 120-400 km and q = 3 at larger sizes. We revise the bulk density of 1999 TC36 and find a density of 0.64 (+0.15/-0.11) g cm-3. On the basis of a modified Spearman rank analysis technique our Plutino sample appears to be biased with respect to object size but unbiased with respect to albedo. Furthermore, we find biases based on geometrical aspects and color in our sample. There is qualitative evidence that icy Plutinos have higher albedos than the average of the sample.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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