THE SPITZER INFRARED SPECTROGRAPH DEBRIS DISK CATALOG. I. CONTINUUM ANALYSIS OF UNRESOLVED TARGETS
THE SPITZER INFRARED SPECTROGRAPH DEBRIS DISK CATALOG. I. CONTINUUM ANALYSIS OF UNRESOLVED TARGETS
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DOI：
10.1088/0067-0049/211/2/25
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发表时间：
2014-03
期刊：
影响因子：
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通讯作者：
Christine H. Chen;T. Mittal;M. Kuchner;W. Forrest;C. Lisse;P. Manoj;B. Sargent;D. Watson
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文献类型：
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作者：
Christine H. Chen;T. Mittal;M. Kuchner;W. Forrest;C. Lisse;P. Manoj;B. Sargent;D. Watson
在斯皮策太空望远镜低温使命期间，保证时间观测员、遗产小组和一般观测员获得了数百个碎片盘候选者的红外光谱仪观测结果。我们校准了571个候选者的光谱，包括64个新的IRAS和斯皮策（MIPS）碎片盘候选者的多波段成像光度计，模拟了他们的恒星光球，并为未解决的碎片盘产生了一个多余的光谱目录。对于499个具有IRS过量但没有强光谱特征的目标（以及具有额外MIPS 70 μm观测的420个目标的子集），我们对IRS（和MIPS数据）进行了建模，假设使用一个或两个温度黑体模型很好地描述了尘埃热发射。我们计算了每个模型的概率，并计算了在模型中选择的平均概率。我们发现，大多数天体（约66%）的光谱能量分布可以用一个双温模型更好地描述，该模型中的暖尘埃（Tgr = 100-500 K）和冷尘埃（Tgr = 50-150 K）种群类似于黄道带和柯伊伯带尘埃，这表明行星系统在碎片盘中很常见，黄道带尘埃在年龄高达101 Gyr的主星周围很常见。我们发现，年轻的恒星通常具有较大的红外光度和较高的晶粒温度和较高的质量恒星的磁盘具有较高的晶粒温度的磁盘。我们发现，碎片磁盘周围的尘埃的距离增加是不一致的自搅拌磁盘模型，预计如果这些系统拥有行星在30-150 Au。最后，我们说明了如何观察碎片磁盘可能被用来约束最小质量的太阳星云中的材料的径向依赖。
During the Spitzer Space Telescope cryogenic mission, Guaranteed Time Observers, Legacy Teams, and General Observers obtained Infrared Spectrograph (IRS) observations of hundreds of debris disk candidates. We calibrated the spectra of 571 candidates, including 64 new IRAS and Multiband Imaging Photometer for Spitzer (MIPS) debris disks candidates, modeled their stellar photospheres, and produced a catalog of excess spectra for unresolved debris disks. For 499 targets with IRS excess but without strong spectral features (and a subset of 420 targets with additional MIPS 70 μm observations), we modeled the IRS (and MIPS data) assuming that the dust thermal emission was well-described using either a one- or two-temperature blackbody model. We calculated the probability for each model and computed the average probability to select among models. We found that the spectral energy distributions for the majority of objects (∼66%) were better described using a two-temperature model with warm (Tgr ∼ 100–500 K) and cold (Tgr ∼ 50–150 K) dust populations analogous to zodiacal and Kuiper Belt dust, suggesting that planetary systems are common in debris disks and zodiacal dust is common around host stars with ages up to ∼1 Gyr. We found that younger stars generally have disks with larger fractional infrared luminosities and higher grain temperatures and that higher-mass stars have disks with higher grain temperatures. We show that the increasing distance of dust around debris disks is inconsistent with self-stirred disk models, expected if these systems possess planets at 30–150 AU. Finally, we illustrate how observations of debris disks may be used to constrain the radial dependence of material in the minimum mass solar nebula.