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arXiv 1005.3151astro-ph.SR
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附近恒星（DUNES）周围的冷尘埃。第一个结果：类太阳恒星zeta ^[2] Ret周围的解析外柯伊伯带

Cold dust around nearby stars (DUNES). First results: A resolved exo-Kuiper belt around the solar-like star zeta^2 Ret

C. Eiroa, D. Fedele, J. Maldonado, B. M. González-García, J. Rodmann, A. M. Heras, G. L. Pilbratt, J. -Ch. Augereau, A. Mora, B. Montesinos, D. Ardila, G. Bryde… 展开作者

C. Eiroa, D. Fedele, J. Maldonado, B. M. González-García, J. Rodmann, A. M. Heras, G. L. Pilbratt, J. -Ch. Augereau, A. Mora, B. Montesinos, D. Ardila, G. Bryden, R. Liseau, K. Stapelfeldt, R. Launhardt, E. Solano, A. Bayo, O. Absil, M. Arévalo, D. Barrado, C. Beichmann, W. Danchi, C. del Burgo, S. Ertel, M. Fridlund, M. Fukagawa, R. Gutiérrez, E. Grün, I. Kamp, A. Krivov, J. Lebreton, T. Löhne, R. Lorente, J. Marshall, R. Martínez-Arnáiz, G. Meeus, D. Montes, A. Morbidelli, S. Müller, H. Mutschke, T. Nakagawa, G. Olofsson, I. Ribas, A. Roberge, J. Sanz-Forcada, P. Thébault, H. Walker, G. J. White, S. Wolf

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摘要：

我们首次对太阳型恒星delta Pav、HR 8501、51 Peg和zeta ^2 Ret进行了远红外观测，这些观测是在沙丘赫歇尔开放时间密钥计划（OTKP）的背景下进行的。该项目使用PACS和SPIRE仪器，目的是研究附近太阳型恒星周围的外柯伊伯带造成的红外过度。从delta Pav、HR 8501和51 Peg观测到的100 μ m通量与预测的光球通量一致，但不包括这些恒星周围比Ldust/Lstar亮约5 x 10^-7（1 sigma水平）的碎片盘。在zeta ^[2] Ret附近发现了一个扁平的盘状结构，其半长轴大小约为100天文单位。解析结构表明存在一个偏心尘埃环，我们将其解释为一个外柯伊伯带，其Ldust/Lstar值约为10^-5。

英文摘要：

We present the first far-IR observations of the solar-type stars delta Pav, HR 8501, 51 Peg and zeta^2 Ret, taken within the context of the DUNES Herschel Open Time Key Programme (OTKP). This project uses the PACS and SPIRE instruments with the objective of studying infrared excesses due to exo-Kuiper belts around nearby solar-type stars. The observed 100 um fluxes from delta Pav, HR 8501, and 51 Peg agree with the predicted photospheric fluxes, excluding debris disks brighter than Ldust/Lstar ~ 5 x 10^-7 (1 sigma level) around those stars. A flattened, disk-like structure with a semi-major axis of ~ 100 AU in size is detected around zeta^2 Ret. The resolved structure suggests the presence of an eccentric dust ring, which we interpret as an exo-Kuiper belt with Ldust/Lstar ~ 10^-5.

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