High mass of the type IIP supernova 2004et inferred from hydrodynamic modeling
High mass of the type IIP supernova 2004et inferred from hydrodynamic modeling
复制标题
DOI：
10.1051/0004-6361/200912273
复制
发表时间：
2009-08
影响因子：
6.5
通讯作者：
V. Utrobin;N. N. C. Mpa-N.;Garching Itep;M. I. O. Astronomy;Ras;Moscow
中科院分区：
文献类型：
--
作者：
V. Utrobin;N. N. C. Mpa-N.;Garching Itep;M. I. O. Astronomy;Ras;Moscow
上下文先前对IIP型超新星的研究推断，从流体动力学模型中恢复的祖先质量高于15 M？。目标。为了验证这类超新星的前身质量，我们尝试了观测良好的发光型IIP超新星2004 et的参数测定。方法.我们通过扩展参数空间中的流体动力学模拟来模拟SN 2004 et的热光变曲线和光球速度。结果根据流体动力学模拟和观测数据，我们推断出前超新星半径为1500 ± 140 R ‰，喷出物质量为24.5 ± 1 M ‰，爆炸能量为（2.3 ± 0.3）× 1051尔格，放射性56 Ni质量为0.068 ± 0.009 M ‰。主层序上的估计祖先质量在25 - 29 M�范围内。此外，我们还发现了SN 2004 et星云光谱中爆炸不对称性的清晰特征。结论. SN 2004 et的测量原始质量明显高于爆炸前图像所显示的原始质量。我们推测，从流体动力学模型推断的质量被高估，关键的缺失因素是多维效应。
Context. Previous studies of type IIP supernovae have inferred that progenitor masses recovered from hydrodynamic models are higher than 15 M� . Aims. To verify the progenitor mass of this supernova category, we attempt a parameter determination of the well-observed luminous type IIP supernova 2004et. Methods. We model the bolometric light curve and the photospheric velocities of SN 2004et by means of hydrodynamic simulations in an extended parameter space. Results. From hydrodynamic simulations and observational data, we infer a presupernova radius of 1500 ± 140 R� , an ejecta mass of 24.5 ± 1 M� , an explosion energy of (2.3 ± 0.3) × 10 51 erg, and a radioactive 56 Ni mass of 0.068 ± 0.009 M� . The estimated progenitor mass on the main sequence is in the range of 25−29 M� . In addition, we find clear signatures of the explosion asymmetry in the nebular spectra of SN 2004et. Conclusions. The measured progenitor mass of SN 2004et is significantly higher than the progenitor mass suggested by the preexplosion images. We speculate that the mass inferred from hydrodynamic modeling is overestimated and crucial missing factors are multi-dimensional effects.