The shape of SN 1993J re-analysed
The shape of SN 1993J re-analysed
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DOI：
10.1093/mnras/staa721
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发表时间：
2020-03
影响因子：
4.8
通讯作者：
H. Stevance;H. Stevance;D. Baade;J. Bruten;A. Cikota;A. Clocchiatti;D. Hines;P. Höflich;J. Maund;F. Patat;P. Vallely;J. C. Wheeler
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作者：
H. Stevance;H. Stevance;D. Baade;J. Bruten;A. Cikota;A. Clocchiatti;D. Hines;P. Höflich;J. Maund;F. Patat;P. Vallely;J. C. Wheeler
作者：Stevance，HF; Baade，D; Bruten，JR; Cikota，A; Clocchiatti，A; Hines，DC; Hoflich，P; Maund，JR; Patat，F; Vallely，PJ;惠勒，JC|摘要：© 2020作者由牛津大学出版社代表皇家天文学会出版SN 1993 J是研究得最好的IIb型超新星之一。光谱偏振数据分析发表于二十多年前，当时超新星光谱偏振测量领域还处于起步阶段。在这里，我们提出了一个新的分析SN 1993 J的光谱偏振数据和改进的估计其星际偏振（ISP），以及在该领域采用的ISP去除技术的关键审查。SN 1993 J的偏振在q-u平面上显示出显著的排列，这表明存在一个主轴，因此是连续偏振。我们还看到了强的线偏振特征，包括H β，He I λ5876，H α，He I λ6678，He I λ7065，以及He I λ5876和H α的高速（HV）分量。因此SN 1993 J是第二个剥离包层超新星的例子，与iPTF 13 bvn一起，具有突出的HV氦极化特征，并且是第一个显示出可能的HV H α贡献的超新星。总体而言，我们确定所观察到的功能可以被解释为各向异性分布的线形成区域的叠加在椭球喷出物。我们不能排除喷出物中有离轴能量源的可能性。这些数据表明，丰富的结构，是无法访问的，如果只考虑通量谱，但可以探测的光谱偏振观测。在未来的研究中，新的ISP校正数据可以与三维辐射传输模型结合使用，以更好地绘制SN 1993 J喷出物的几何形状。
Author(s): Stevance, HF; Baade, D; Bruten, JR; Cikota, A; Clocchiatti, A; Hines, DC; Hoflich, P; Maund, JR; Patat, F; Vallely, PJ; Wheeler, JC | Abstract: © 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society SN 1993J is one of the best-studied Type IIb supernovae. Spectropolarimetric data analyses were published over two decades ago at a time when the field of supernova spectropolarimetry was in its infancy. Here, we present a new analysis of the spectropolarimetric data of SN 1993J and an improved estimate of its interstellar polarization (ISP) as well as a critical review of ISP removal techniques employed in the field. The polarization of SN 1993J is found to show significant alignment on the q − u plane, suggesting the presence of a dominant axis and therefore of continuum polarization. We also see strong line polarization features, including H β, He I λ5876, H α, He I λ6678, He I λ7065, and high velocity (HV) components of He I λ5876 and H α. SN 1993J is therefore the second example of a stripped-envelope supernova, alongside iPTF13bvn, with prominent HV helium polarization features, and the first to show a likely HV H α contribution. Overall, we determine that the observed features can be interpreted as the superposition of anisotropically distributed line forming regions over ellipsoidal ejecta. We cannot exclude the possibility of an off-axis energy source within the ejecta. These data demonstrate the rich structures that are inaccessible if solely considering the flux spectra but can be probed by spectropolarimetric observations. In future studies, the new ISP corrected data can be used in conjunction with 3D radiative transfer models to better map the geometry of the ejecta of SN 1993J.