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arXiv 1306.0328astro-ph.SR
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赫歇尔空间天文台观测到的TW长蛇座星协中的气体和尘埃

Gas and dust in the TW Hydrae Association as seen by the Herschel Space Observatory

P. Riviere-Marichalar, C. Pinte, D. Barrado, W. F. Thi, C. Eiroa, I. Kamp, B. Montesinos, J. Donaldson, J. -C. Augereau, N. Huélamo, A. Roberge, D. Ardila, G. S… 展开作者

P. Riviere-Marichalar, C. Pinte, D. Barrado, W. F. Thi, C. Eiroa, I. Kamp, B. Montesinos, J. Donaldson, J. -C. Augereau, N. Huélamo, A. Roberge, D. Ardila, G. Sandell, J. P. Williams, W. R. F. Dent, F. Menard, J. Lillo-Box, G. Duchêne

摘要:

上下文星周盘是行星形成的地方,因此了解它们的演化对于我们理解行星形成至关重要。赫歇尔空间天文台由于其灵敏度和波长覆盖范围,为研究盘系统提供了宝贵的数据。本文是几个致力于分析和模拟赫歇尔PACS观测各种年轻的恒星协会从GASPS开放时间关键计划之一。目标。本文的目的是阐明的气体和尘埃的性质,拱星盘在10万年TW Hya协会(TWA)使用新的远红外(IR)成像和光谱从Herschel-PACS。方法.我们获得了远红外光度数据在70,100,和160微米的14个TWA成员,光谱观测集中在[OI]线在63.18微米,也获得了9的14。每颗恒星的新光度计都被纳入其全光谱能量分布(SED)中。结果我们检测到过量的红外辐射,这是从五个TWA成员的拱星盘的特征,并计算了另外九个的上限。两个TWA成员(TWA 01和TWA 04 B)也显示在63.18微米处的[OI]发射。根据改进的黑体模型,TWA协会中的圆盘显示出各种属性,具有广泛的尘埃质量和内半径。在样品中发现了过渡盘和碎片盘。探测到红外线过量的来源模型给出的尘埃质量范围为0.15 Msun至63 Msun。

英文摘要:

Context. Circumstellar discs are the places where planets form, therefore knowledge of their evolution is crucial for our understanding of planet formation. The Herschel Space Observatory is providing valuable data for studying disc systems, thanks to its sensitivity and wavelength coverage. This paper is one of several devoted to analysing and modelling Herschel-PACS observations of various young stellar associations from the GASPS Open Time Key Programme. Aims. The aim of this paper is to elucidate the gas and dust properties of circumstellar discs in the 10 Myr TW Hya Association (TWA) using new far-infrared (IR) imaging and spectroscopy from Herschel-PACS. Methods. We obtained far-IR photometric data at 70, 100, and 160 microns of 14 TWA members; spectroscopic observations centred on the [OI] line at 63.18 microns were also obtained for 9 of the 14. The new photometry for each star was incorporated into its full spectral energy distribution (SED). Results. We detected excess IR emission that is characteristic of circumstellar discs from five TWA members, and computed upper limits for another nine. Two TWA members (TWA 01 and TWA 04B) also show [OI] emission at 63.18 microns. Discs in the TWA association display a variety of properties, with a wide range of dust masses and inner radii, based on modified blackbody modelling. Both transitional and debris discs are found in the sample. Models for sources with a detected IR excess give dust masses in the range from 0.15 Msun to 63 Msun.

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