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arXiv 1005.3137astro-ph.SR
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解析行星宿主星周围的冷碎片盘:q1 Eri的PACS测光成像观测(HD10647,HR506)

Resolving the cold debris disc around a planet-hosting star: PACS photometric imaging observations of q1 Eri (HD10647, HR506)

R. Liseau, C. Eiroa, D. Fedele, J. -C. Augereau, G. Olofsson, B. González, J. Maldonado, B. Montesinos, A. Mora, O. Absil, D. Ardila, D. Barrado, A. Bayo, C. A.… 展开作者

R. Liseau, C. Eiroa, D. Fedele, J. -C. Augereau, G. Olofsson, B. González, J. Maldonado, B. Montesinos, A. Mora, O. Absil, D. Ardila, D. Barrado, A. Bayo, C. A. Beichman, G. Bryden, W. C. Danchi, C. del Burgo, S. Ertel, C. W. M. Fridlund, A. M. Heras, A. V. Krivov, R. Launhardt, J. Lebreton, T. Löhne, J. P. Marshall, G. Meeus, S. Müller, G. L. Pilbratt, A. Roberge, J. Rodmann, E. Solano, K. R. Stapelfeldt, Ph. Thébault, G. J. White, S. Wolf

摘要:

大约有24个太阳系外碎片系统已得到空间分辨。这些碎片盘通常显示出各种结构特征,如团块、环、带、偏心分布和螺旋图案。在大多数情况下,这些特征被认为是由围绕主恒星运行的行星的动力学影响形成、塑造和维持的。在极少数情况下,通过直接观测推断出动力学上重要的行星的存在。已知太阳型恒星q1 Eri被碎片包围,尺度<30“。已知这颗恒星至少有一颗行星,尽管它的轨道太小,无法使它负责数十到数百AU距离的结构。目前的调查有两个目的:确定碎片的光学和物质特性,并推断尘埃的空间分布,这可能暗示存在其他行星。赫歇尔空间天文台上的光电探测器阵列相机和光谱仪(PACS)可以以前所未有的分辨率进行远红外成像观测,即在60 μm至210 μm的波长范围内,分辨率优于6“至12”。这些空间分辨数据与地面观测的结果一起,可以建立模型,从而比单独利用未分辨数据更可靠地确定碎片的性质及其演变。这是第一次在远红外波长下分辨出q1 Eri圆盘。PACS在70、100和160 μm波段的观测结果显示,在所有波段都显示出一个椭圆形的盘状结构,其尺寸随波长的增加而增加。假设一个圆形的形状产生其赤道平面相对于天空的倾角,i > 53度。图像去卷积的结果表明i可能大于63度,其中90度对应于边缘上的盘。(略)

英文摘要:

About two dozen exo-solar debris systems have been spatially resolved. These debris discs commonly display a variety of structural features such as clumps, rings, belts, eccentric distributions and spiral patterns. In most cases, these features are believed to be formed, shaped and maintained by the dynamical influence of planets orbiting the host stars. In very few cases has the presence of the dynamically important planet(s) been inferred from direct observation. The solar-type star q1 Eri is known to be surrounded by debris, extended on scales of < 30''. The star is known to host at least one planet, albeit on an orbit far too small to make it responsible for structures at distances of tens to hundreds of AU. The aim of the present investigation is twofold: to determine the optical and material properties of the debris and to infer the spatial distribution of the dust, which may hint at the presence of additional planets. The photodetector array camera and spectrometer (PACS) aboard the Herschel Space Observatory allows imaging observations in the far infrared at unprecedented resolution, i.e. at better than 6'' to 12'' over the wavelength range of 60 μm to 210 μm. Together with the results from ground-based observations, these spatially resolved data can be modelled to determine the nature of the debris and its evolution more reliably than would be possible from unresolved data alone. For the first time has the q1 Eri disc been resolved at far infrared wavelengths. The PACS observations at 70, 100 and 160 μm reveal an oval image showing a disc-like structure in all bands, the size of which increases with wavelength. Assuming a circular shape yields the inclination of its equatorial plane with respect to that of the sky, i > 53deg. The results of image de-convolution indicate that i likely is larger than 63deg, where 90deg corresponds to an edge-on disc. {abridged}

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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