CONSTRAINTS ON TYPE Ia SUPERNOVA PROGENITOR COMPANIONS FROM EARLY ULTRAVIOLET OBSERVATIONS WITH SWIFT
CONSTRAINTS ON TYPE Ia SUPERNOVA PROGENITOR COMPANIONS FROM EARLY ULTRAVIOLET OBSERVATIONS WITH SWIFT
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DOI：
10.1088/0004-637x/749/1/18
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发表时间：
2012-03
期刊：
影响因子：
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通讯作者：
P. Brown;K. Dawson;David W. Harris;M. Olmstead;P. Milne;P. Roming
中科院分区：
文献类型：
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作者：
P. Brown;K. Dawson;David W. Harris;M. Olmstead;P. Milne;P. Roming
我们比较早期的紫外线（UV）观测Ia型超新星（SNe Ia）与理论预测的亮度与SN喷出物和伴星星星之间的碰撞的冲击。我们简单的方法是独立的内禀流量从SN和处理与斯威夫特/紫外光学望远镜观测到的流量作为保守的上限的冲击亮度。比较这个限制与各种冲击模型的预测通量，我们约束的SN祖伴系统的几何形状。我们发现，1 M重的红超巨星同伴在罗奇瓣溢出的模型被排除在95%的置信水平，大多数个人SNe的所有，但最不利的视角。对于12颗超新星的样本，视角的上限与预期的红色巨星的视角分布不一致，因为大多数同伴具有高置信度。分离距离的限制允许主序伴随。更好地了解SN本身产生的紫外通量以及对年轻的SNe Ia的持续紫外观测将进一步限制SNe Ia的可能祖先。
We compare early ultraviolet (UV) observations of Type Ia supernovae (SNe Ia) with theoretical predictions for the brightness of the shock associated with the collision between SN ejecta and a companion star. Our simple method is independent of the intrinsic flux from the SN and treats the flux observed with the Swift/Ultra-Violet Optical Telescope as conservative upper limits on the shock brightness. Comparing this limit with the predicted flux for various shock models, we constrain the geometry of the SN progenitor–companion system. We find the model of a 1 M☉ red supergiant companion in Roche-lobe overflow to be excluded at a 95% confidence level for most individual SNe for all but the most unfavorable viewing angles. For the sample of 12 SNe taken together, the upper limits on the viewing angle are inconsistent with the expected distribution of viewing angles for red gaint stars as the majority of companions with high confidence. The separation distance constraints do allow main-sequence companions. A better understanding of the UV flux arising from the SN itself as well as continued UV observations of young SNe Ia will further constrain the possible progenitors of SNe Ia.