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arXiv 1404.1002astro-ph.HEastro-ph.SR
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Ia型超新星LSQ12gdj早期紫外辐射:没有持续激波相互作用的证据

Early ultraviolet emission in the Type Ia supernova LSQ12gdj: No evidence for ongoing shock interaction

R. A. Scalzo, M. Childress, B. Tucker, F. Yuan, B. Schmidt, P. J. Brown, C. Contreras, N. Morrell, E. Hsiao, C. Burns, M. M. Phillips, A. Campillay, C. Gonzalez… 展开作者

R. A. Scalzo, M. Childress, B. Tucker, F. Yuan, B. Schmidt, P. J. Brown, C. Contreras, N. Morrell, E. Hsiao, C. Burns, M. M. Phillips, A. Campillay, C. Gonzalez, K. Krisciunas, M. Stritzinger, M. L. Graham, J. Parrent, S. Valenti, C. Lidman, B. Schaefer, N. Scott, M. Fraser, A. Gal-Yam, C. Inserra, K. Maguire, S. J. Smartt, J. Sollerman, M. Sullivan, F. Taddia, O. Yaron, D. R. Young, S. Taubenberger, C. Baltay, N. Ellman, U. Feindt, E. Hadjiyska, R. McKinnon, P. E. Nugent, D. Rabinowitz, E. S. Walker

摘要:

我们提出了LSQ 12 gdj,一个缓慢下降,紫外线明亮的Ia型超新星的光球相观测。LSQ 12 gdj在最大亮度之前就已经被分类,它的绝对星等是经过消隐修正的$M_B = -19.8$,极大亮度之前的光谱演化类似于SN 1991 T和超巨塞卡星系SN 2007 if。我们使用雨燕的紫外测光、地基光学测光和近红外测光模板的校正来构建$B$波段最大光过去45天的测辐射热(1600-23800流明)光变曲线。我们估计,LSQ 12 gdj产生了$^{56}$ Ni的$0.96 \pm 0.07$ $M_\odot$,其喷射质量接近或略高于Ekrasekhar质量。在最早观测到的阶段,有27%的通量和最大光时的17%是向3300 nm的蓝光发射的。后期没有多余的亮度,光谱能量分布向蓝方向的截止值为3000 μ m,没有窄线发射和强的Na I D吸收,这些都反对持续的激波相互作用的重要贡献。然而,LSQ 12 gdj接近最大亮度的10%可能是由捕获辐射的释放产生的,包括在爆炸后不久与紧凑的贫氢包层(半径$< 10^{13}$ cm)短暂相互作用期间热化的动能;这样的包层通常出现在双简并合并场景中。

英文摘要:

We present photospheric-phase observations of LSQ12gdj, a slowly-declining, UV-bright Type Ia supernova. Classified well before maximum light, LSQ12gdj has extinction-corrected absolute magnitude $M_B = -19.8$, and pre-maximum spectroscopic evolution similar to SN 1991T and the super-Chandrasekhar-mass SN 2007if. We use ultraviolet photometry from Swift, ground-based optical photometry, and corrections from a near-infrared photometric template to construct the bolometric (1600-23800 Å) light curve out to 45 days past $B$-band maximum light. We estimate that LSQ12gdj produced $0.96 \pm 0.07$ $M_\odot$ of $^{56}$Ni, with an ejected mass near or slightly above the Chandrasekhar mass. As much as 27% of the flux at the earliest observed phases, and 17% at maximum light, is emitted bluewards of 3300 Å. The absence of excess luminosity at late times, the cutoff of the spectral energy distribution bluewards of 3000 Å, and the absence of narrow line emission and strong Na I D absorption all argue against a significant contribution from ongoing shock interaction. However, up to 10% of LSQ12gdj's luminosity near maximum light could be produced by the release of trapped radiation, including kinetic energy thermalized during a brief interaction with a compact, hydrogen-poor envelope (radius $< 10^{13}$ cm) shortly after explosion; such an envelope arises generically in double-degenerate merger scenarios.

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