标题： 用斯皮策在160微米附近对FGK型恒星的巡天 显示英文标题

标题： Survey of Nearby FGK Stars at 160 microns with Spitzer

摘要： 斯皮策空间望远镜通过使用MIPS在24和70微米波段以及使用IRS在8到34微米波段观测附近的A、F、G、K和M型恒星，极大地推动了尘埃盘科学的发展，并提供了丰富的关于尘埃盘的信息。在这里，我们展示了这些恒星中一小部分在160微米波段的观测结果。在这个波长上，恒星光球辐射可以忽略不计，任何探测到的发射都对应于扩展柯伊伯带类似物中的冷尘。然而，斯皮策160微米观测受到大天线束尺寸的限制，这导致由于星际物质和河外源混淆而产生显著的“噪声”。此外，160微米测量还受到星光位置旁边漏光的影响，该漏光的流量与恒星的近红外流量成正比。我们能够去除漏光的污染，并报告24颗恒星的160微米测量值或上限。三颗恒星（HD 10647、HD 207129和HD 115617）在160微米处有超量，我们利用这些超量来约束它们周围尘埃盘的性质。更详细的HD 10647恒星的谱能量分布模型表明，70和160微米的发射可能是由距离100AU的小水冰颗粒引起的，这与哈勃太空望远镜对该系统恒星周围物质的光学成像一致。 显示英文摘要

摘要： The Spitzer Space Telescope has advanced debris disk science tremendously with a wealth of information on debris disks around nearby A, F, G, K and M stars at 24 and 70 microns with the MIPS photometer and at 8-34 microns with IRS. Here we present 160 micron observations of a small sub-set of these stars. At this wavelength, the stellar photospheric emission is negligible and any detected emission corresponds to cold dust in extended Kuiper belt analogs. However, the Spitzer 160 micron observations are limited in sensitivity by the large beam size which results in significant ''noise'' due to cirrus and extragalactic confusion. In addition, the 160 micron measurements suffer from the added complication of a light leak next to the star's position whose flux is proportional to the near-infrared flux of the star. We are able to remove the contamination from the leak and report 160 micron measurements or upper limits for 24 stars. Three stars (HD 10647, HD 207129, and HD 115617) have excesses at 160 micron that we use to constrain the properties of the debris disks around them. A more detailed model of the spectral energy distribution of HD 10647 reveals that the 70 and 160 micron emission could be due to small water ice particles at a distance of 100 AU consistent with Hubble Space Telescope optical imaging of circumstellar material in the system.