DUst around NEarby Stars. The survey observational results
DUst around NEarby Stars. The survey observational results
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DOI：
10.1051/0004-6361/201321050
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发表时间：
2013-05
影响因子：
6.5
通讯作者：
C. Eiroa;J. Marshall;A. Mora;B. Montesinos;O. Absil;J. Augereau;A. Bayo;G. Bryden;W. Danchi;C. D. Burgo;S. Ertel;M. Fridlund;A. Heras;A. Krivov;R. Launhardt;R. Liseau;T. Löhne;J. Maldonado;G. Pilbratt;A. Roberge;J. Rodmann;J. Sanz-Forcada;E. Solano;K. Stapelfeldt;P. Thebault;S. Wolf;D. Ardila;M. Arévalo;C. Beichmann;V. Faramaz;B. González-García;R. Gutierrez;Jean-Pierre Lebreton;R. Martínez-Arnáiz;G. Meeus;D. Montes;G. Olofsson;Kate Y. L. Su;G. J. White;G. J. White;D. Barrado;M. Fukagawa;Eberhard Grün;I. Kamp;R. Lorente;A. Morbidelli;S. Müller;H. Mutschke;Takao Nakagawa;I. Ribas;H. Walker
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文献类型：
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作者：
C. Eiroa;J. Marshall;A. Mora;B. Montesinos;O. Absil;J. Augereau;A. Bayo;G. Bryden;W. Danchi;C. D. Burgo;S. Ertel;M. Fridlund;A. Heras;A. Krivov;R. Launhardt;R. Liseau;T. Löhne;J. Maldonado;G. Pilbratt;A. Roberge;J. Rodmann;J. Sanz-Forcada;E. Solano;K. Stapelfeldt;P. Thebault;S. Wolf;D. Ardila;M. Arévalo;C. Beichmann;V. Faramaz;B. González-García;R. Gutierrez;Jean-Pierre Lebreton;R. Martínez-Arnáiz;G. Meeus;D. Montes;G. Olofsson;Kate Y. L. Su;G. J. White;G. J. White;D. Barrado;M. Fukagawa;Eberhard Grün;I. Kamp;R. Lorente;A. Morbidelli;S. Müller;H. Mutschke;Takao Nakagawa;I. Ribas;H. Walker
上下文碎片盘是行星形成过程的结果，构成了微行星系统的指纹。它们在太阳系中的对应物是小行星和埃奇奥尔-柯伊伯带。目标。DUNES巡天的目的是探测太阳系外类似于太阳型恒星周围的埃奇奥尔-柯伊伯带的类似物，从而将太阳系置于背景中。这项调查使我们能够解决一些有关的流行和性质的星子系统的问题。方法.我们使用Herschel/PACS观察附近FGK恒星的样本。获得了100和160 μ m的数据，在某些情况下，用SPIRE在70 μ m和250、350和500 μ m进行了补充观测。观测策略是在100 μ m的深度进行积分，以探测恒星光球层。结果碎片盘已被检测到，其分光度水平低至埃奇韦尔-柯伊伯带的几倍。DUNES恒星周围的盘的发生率从Herschel之前的12.1% +/- 5%增加到20.2% +/-2%。一个显着的分数（类似于52%）的光盘解决，这代表了一个巨大的进步，从以前已知的解决光盘。一些恒星与微弱的远红外线过度有关，这归因于一类新的冷盘。虽然不能排除这些过剩是由背景星系的巧合排列产生的，但统计数据表明，其中至少有一些是真正的碎片盘。一些光盘显示特殊的SED与光谱指数在70-160亩的范围比瑞利-牛仔裤之一陡峭。对碎片盘参数的分析表明，从F型到K型星，平均黑体半径可能存在减小的趋势。此外，一个弱的趋势，建议的相关性的磁盘大小和磁盘温度与恒星年龄的关系。
Context. Debris discs are a consequence of the planet formation process and constitute the fingerprints of planetesimal systems. Their solar system counterparts are the asteroid and Edgeworth-Kuiper belts. Aims. The DUNES survey aims at detecting extra-solar analogues to the Edgeworth-Kuiper belt around solar-type stars, putting in this way the solar system into context. The survey allows us to address some questions related to the prevalence and properties of planetesimal systems. Methods. We used Herschel/PACS to observe a sample of nearby FGK stars. Data at 100 and 160 mu m were obtained, complemented in some cases with observations at 70 mu m, and at 250, 350 and 500 mu m using SPIRE. The observing strategy was to integrate as deep as possible at 100 mu m to detect the stellar photosphere. Results. Debris discs have been detected at a fractional luminosity level down to several times that of the Edgeworth-Kuiper belt. The incidence rate of discs around the DUNES stars is increased from a rate of similar to 12.1% +/- 5% before Herschel to similar to 20.2% +/- 2%. A significant fraction (similar to 52%) of the discs are resolved, which represents an enormous step ahead from the previously known resolved discs. Some stars are associated with faint far-IR excesses attributed to a new class of cold discs. Although it cannot be excluded that these excesses are produced by coincidental alignment of background galaxies, statistical arguments suggest that at least some of them are true debris discs. Some discs display peculiar SEDs with spectral indexes in the 70-160 mu m range steeper than the Rayleigh-Jeans one. An analysis of the debris disc parameters suggests that a decrease might exist of the mean black body radius from the F-type to the K-type stars. In addition, a weak trend is suggested for a correlation of disc sizes and an anticorrelation of disc temperatures with the stellar age.