CfA3: 185 TYPE Ia SUPERNOVA LIGHT CURVES FROM THE CfA
CfA3: 185 TYPE Ia SUPERNOVA LIGHT CURVES FROM THE CfA
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DOI：
10.1088/0004-637x/700/1/331
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发表时间：
2009-01
期刊：
影响因子：
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通讯作者：
M. Hicken;P. Challis;S. Jha;R. Kirshner;T. Matheson;M. Modjaz;A. Rest;W. Michael Wood-Vasey;G. Bakos;E. Barton;P. Berlind;A. Bragg;C. Briceño;Warren R. Brown;N. Caldwell;M. Calkins;Richard Cho;L. Ciupik;M. Contreras;Kristi Dendy;A. Dosaj;Nick Durham;K. Eriksen;G. Esquerdo;M. Everett;E. Falco;J. Fernández;Alejandro E. Gaba;P. Garnavich;G. Graves;P. Green;T. Groner;C. Hergenrother;M. Holman;V. Hradecky;J. Huchra;Bob Hutchison;D. Jerius;A. Jordán;R. Kilgard;M. Krauss;K. Luhman;L. Macri;D. Marrone;J. McDowell;D. McIntosh;B. McNamara;T. Megeath;B. Mochejska;D. Muñoz;J. Muzerolle;O. Naranjo;G. Narayan;M. Pahre;W. Peters;D. Peterson;K. Rines;B. Ripman;Anna Roussanova;R. Schild;A. Sicilia-Aguilar;J. Sokoloski;Kyle Smalley;Andy Smith;T. Spahr;K. Stanek;P. Barmby;S. Blondin;C. Stubbs;A. Szentgyorgyi;M. Torres;Amili Vaz;A. Vikhlinin;Zhong Wang;M. Westover;D. Woods;P. Zhao
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文献类型：
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作者：
M. Hicken;P. Challis;S. Jha;R. Kirshner;T. Matheson;M. Modjaz;A. Rest;W. Michael Wood-Vasey;G. Bakos;E. Barton;P. Berlind;A. Bragg;C. Briceño;Warren R. Brown;N. Caldwell;M. Calkins;Richard Cho;L. Ciupik;M. Contreras;Kristi Dendy;A. Dosaj;Nick Durham;K. Eriksen;G. Esquerdo;M. Everett;E. Falco;J. Fernández;Alejandro E. Gaba;P. Garnavich;G. Graves;P. Green;T. Groner;C. Hergenrother;M. Holman;V. Hradecky;J. Huchra;Bob Hutchison;D. Jerius;A. Jordán;R. Kilgard;M. Krauss;K. Luhman;L. Macri;D. Marrone;J. McDowell;D. McIntosh;B. McNamara;T. Megeath;B. Mochejska;D. Muñoz;J. Muzerolle;O. Naranjo;G. Narayan;M. Pahre;W. Peters;D. Peterson;K. Rines;B. Ripman;Anna Roussanova;R. Schild;A. Sicilia-Aguilar;J. Sokoloski;Kyle Smalley;Andy Smith;T. Spahr;K. Stanek;P. Barmby;S. Blondin;C. Stubbs;A. Szentgyorgyi;M. Torres;Amili Vaz;A. Vikhlinin;Zhong Wang;M. Westover;D. Woods;P. Zhao
我们介绍了185颗Ia型超新星（SNe Ia）的多波段光度测量，超过11,500次观测。这些数据是在2001年至2008年间由哈佛-史密森天体物理中心（CfA）的f.l.惠普尔天文台获得的。这个样本包含了迄今为止发表的最多的均匀观测和还原的Ia超新星（z > 0.08）。它是附近样本的两倍多，将SN Ia宇宙学带到了系统不确定性占主导地位的地步。对于比17.5等亮的点，我们的自然系统光度测量的精度在BVRIr ‘ i ’上为≤0.02等，在U上为≤0.04等。我们还估计了我们的Ia标准系统BVRIr ‘ i ’光度测量的系统不确定度为0.03等，U为0.07等。将我们的标准系统光度测量与已发表的Ia SN光曲线和比较恒星（在可用的情况下）进行比较，在大多数情况下，结果在百分之几等的水平上是一致的。我们发现类似1991bg的Ia型超新星在颜色和光曲线形状/亮度关系上与其他Ia型超新星有足够的区别，因此它们应该在光曲线/距离滤波训练样本中单独处理。CfA3样品将有助于更好的光曲线/距离筛选器的发展，特别是在几十个近红外测光法已经获得的情况下，可以帮助解开宿主星系从内在超新星颜色变红的问题，减少SN Ia距离因尘埃而产生的系统不确定性。
We present multiband photometry of 185 type-Ia supernovae (SNe Ia), with over 11,500 observations. These were acquired between 2001 and 2008 at the F. L. Whipple Observatory of the Harvard-Smithsonian Center for Astrophysics (CfA). This sample contains the largest number of homogeneously observed and reduced nearby SNe Ia (z ≲ 0.08) published to date. It more than doubles the nearby sample, bringing SN Ia cosmology to the point where systematic uncertainties dominate. Our natural system photometry has a precision of ≲0.02 mag in BVRIr′i′ and ≲0.04 mag in U for points brighter than 17.5 mag. We also estimate a systematic uncertainty of 0.03 mag in our SN Ia standard system BVRIr′i′ photometry and 0.07 mag for U. Comparisons of our standard system photometry with published SN Ia light curves and comparison stars, where available for the same SN, reveal agreement at the level of a few hundredths mag in most cases. We find that 1991bg-like SNe Ia are sufficiently distinct from other SNe Ia in their color and light-curve-shape/luminosity relation that they should be treated separately in light-curve/distance fitter training samples. The CfA3 sample will contribute to the development of better light-curve/distance fitters, particularly in the few dozen cases where near-infrared photometry has been obtained and, together, can help disentangle host-galaxy reddening from intrinsic supernova color, reducing the systematic uncertainty in SN Ia distances due to dust.