Kuiper belts around nearby stars
Kuiper belts around nearby stars
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附近恒星周围的柯伊伯带
DOI：
10.1051/0004-6361/201014444
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发表时间：
2010
影响因子：
6.5
通讯作者：
Didcot
中科院分区：
文献类型：
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作者：
R. Nilsson;R. Liseau;A. Brandeker;G. Olofsson;G. Pilbratt;C. Risacher;J. Rodmann;J. Augereau;P. Bergman;C. Eiroa;M. Fridlund;P. Th'ebault;G. P. D. O. Astronomy;S. University;Stockholm;Sweden.;O. Observatory;C. Technology;Onsala;E. A. Division;Estec;Noordwijk;The Netherlands.;Sron;Groningen;Esaestec Space Environment;Effects Section;U. J. Fourier;L. D. D. Grenoble;Grenoble;France.;Dpto. de F'isica Te'orica;F. Ciencias;U. A. D. Madrid;Madrid;Spain.;O. Paris;S. Meudon;D. Physics;Astronomy;Open University;M. Keynes;UK.;Science;Technology Facilities Council;R. Laboratory;Didcot
上下文。在大部分太阳型主序恒星周围存在着尘埃碎片盘，这是通过与恒星光球的预期相比，从过量的远红外线和亚毫米辐射推断出来的，表明类似于太阳系小行星和彗星储存库的残余星子带是常见的。目标。灵敏的亚毫米观测对于探测和表征源自柯伊伯带距离（30-50天文单位或更远）的盘状、带状或环状小天体碰撞的冷扩展尘埃是必不可少的。测量这些波长的通量密度将扩展现有的红外测光技术，并允许更详细地模拟圆盘光谱能量分布（SED）的瑞利-金斯尾巴，有效地限制尘埃特性和圆盘扩展。通过观察从几到几百迈尔的恒星，可以研究行星形成关键阶段碎片盘的演化。方法。作为APEX望远镜LABOCA辐射热计大型项目的一部分，我们观测了22个870 μm的外柯伊伯带候选者。通过积分870 μm通量计算尘埃质量（或上限），并与探测源的SED拟合，得到尘埃的分数光度、尘埃温度和不透明度指数的幂律指数β。结果。总共进行了10次至少具有3σ显著性的探测，其中5次（HD 95086, HD 131835, HD 161868， HD 170773和HD 207129）以前从未在亚毫米波长被探测到。另外三个源被边缘检测到，具有>2.5σ显著性。最佳拟合β参数均在0.1 ~ 0.8之间，与先前的结果一致，表明存在明显大于ISM的晶粒。从我们相对较小的样本中，我们估计了fdust∝t−α， α ~ 0.8−2.0，并确定了特征径向尘埃距离Rdust的演变与t1 /3的增加相一致
Context. The existence of dusty debris disks around a large fraction of solar type main-sequence stars, inferred from excess far-IR and submillimetre emission compared to that expected from stellar photospheres, suggests that leftover planetesimal belts analogous to the asteroid- and comet reservoirs of the solar system are common. Aims. Sensitive submillimetre observations are essential to detect and characterise cold extended dust originating from collisions of small bodies in disks, belts, or rings at Kuiper-belt distances (30–50 AU or beyond). Measurements of the flux densities at these wavelengths will extend existing IR photometry and permit more detailed modelling of the Rayleigh-Jeans tail of the disks spectral energy distribution (SED), effectively constraining dust properties and disk extensions. By observing stars spanning from a few up to several hundred Myr, the evolution of debris disks during crucial phases of planet formation can be studied. Methods. We observed 22 exo-Kuiper-belt candidates at 870 μm, as part of a large programme with the LABOCA bolometer at the APEX telescope. Dust masses (or upper limits) were calculated from integrated 870 μm fluxes, and fits to the SED of detected sources revealed the fractional dust luminosities fdust, dust temperatures Tdust, and power-law exponents β of the opacity law. Results. A total of 10 detections with at least 3σ significance were made, out of which five (HD 95086, HD 131835, HD 161868, HD 170773, and HD 207129) have previously never been detected at submillimetre wavelengths. Three additional sources are marginally detected with >2.5σ significance. The best-fit β parameters all lie between 0.1 and 0.8, in agreement with previous results indicating the presence of significantly larger grains than those in the ISM. From our relatively small sample we estimate fdust ∝t −α , with α ∼ 0.8−2.0, and identify an evolution of the characteristic radial dust distance Rdust that is consistent with the t 1/3 increase
DOI：
10.1086/520511
发表时间：
2007-09
期刊：
The Astrophysical Journal Supplement Series
影响因子：
--
作者：
F. Bertoldi;C. Carilli;M. Aravena;E. Schinnerer;H. Voss;V. Smolčić;K. Jahnke;N. Scoville;A. Blain;K. Menten;D. Lutz;M. Brusa;Y. Taniguchi;P. Capak;B. Mobasher;S. Lilly;D. Thompson;H. Aussel;E. Kreysa;G. Hasinger;James E. Aguirre;J. Schlaerth;A. Koekemoer
通讯作者：
F. Bertoldi;C. Carilli;M. Aravena;E. Schinnerer;H. Voss;V. Smolčić;K. Jahnke;N. Scoville;A. Blain;K. Menten;D. Lutz;M. Brusa;Y. Taniguchi;P. Capak;B. Mobasher;S. Lilly;D. Thompson;H. Aussel;E. Kreysa;G. Hasinger;James E. Aguirre;J. Schlaerth;A. Koekemoer