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arXiv 1006.4162astro-ph.CO
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SDWFS-MT-1:一个z~0.2的自遮蔽发光超新星

SDWFS-MT-1: A Self-Obscured Luminous Supernova at z~0.2

Szymon Kozlowski, C. S. Kochanek, D. Stern, J. L. Prieto, K. Z. Stanek, T. A. Thompson, R. J. Assef, A. J. Drake, D. M. Szczygiel, P. R. Wozniak, P. Nugent, M. … 展开作者

Szymon Kozlowski, C. S. Kochanek, D. Stern, J. L. Prieto, K. Z. Stanek, T. A. Thompson, R. J. Assef, A. J. Drake, D. M. Szczygiel, P. R. Wozniak, P. Nugent, M. L. N. Ashby, E. Beshore, M. J. I. Brown, Arjun Dey, R. Griffith, F. Harrison, B. T. Jannuzi, S. Larson, K. Madsen, B. Pilecki, G. Pojmanski, J. Skowron, W. T. Vestrand, J. A. Wren

摘要:

我们报告了一个长达六个月的中红外瞬态,SDWFS-MT-1(又名SN 2007 va),在斯皮策深,宽视场调查的NOAO深宽视场调查Bootes领域的发现。该瞬变位于一个z=0.19的低光度(M_[4.5]~-18.6 mag,L/L_MilkyWay~0.01)贫金属(12+log(O/H)~7.8)不规则星系中,在4.5 μ m Spitzer/IRAC波段的中红外绝对星等M_[4.5]~-24.2处达到峰值,发射的总能量至少为10^51 ergs。光发射可能比中红外线更微弱,尽管我们对光发射的限制很差,因为当光源“落后”太阳时,瞬态达到峰值。Spitzer数据与温度为~1350 K的修正黑体的发射一致。我们排除了一些方案的起源,如银河系的恒星,活动星系核活动,伽玛射线暴,潮汐中断的恒星的黑洞和引力透镜的瞬态。最合理的情况是超新星在一个巨大的、光学厚度的星周介质中爆炸,该介质由先前喷出的物质组成的多个壳层组成。如果这个假设是正确的,那么很大一部分(约10%)最明亮的超新星可能不仅在超新星发生之前,而且在超新星发生之后都被尘埃自我遮蔽。这样一颗超新星的前身的光谱能量分布是船底座η的稍冷版本,峰值在20-30微米。

英文摘要:

We report the discovery of a six-month-long mid-infrared transient, SDWFS-MT-1 (aka SN 2007va), in the Spitzer Deep, Wide-Field Survey of the NOAO Deep Wide-Field Survey Bootes field. The transient, located in a z=0.19 low luminosity (M_[4.5]~-18.6 mag, L/L_MilkyWay~0.01) metal-poor (12+log(O/H)~7.8) irregular galaxy, peaked at a mid-infrared absolute magnitude of M_[4.5]~-24.2 in the 4.5 micron Spitzer/IRAC band and emitted a total energy of at least 10^51 ergs. The optical emission was likely fainter than the mid-infrared, although our constraints on the optical emission are poor because the transient peaked when the source was "behind" the Sun. The Spitzer data are consistent with emission by a modified black body with a temperature of ~1350 K. We rule out a number of scenarios for the origin of the transient such as a Galactic star, AGN activity, GRB, tidal disruption of a star by a black hole and gravitational lensing. The most plausible scenario is a supernova exploding inside a massive, optically thick circumstellar medium, composed of multiple shells of previously ejected material. If the proposed scenario is correct, then a significant fraction (~10%) of the most luminous supernova may be self-enshrouded by dust not only before but also after the supernova occurs. The spectral energy distribution of the progenitor of such a supernova would be a slightly cooler version of eta Carina, peaking at 20-30 microns.

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