SN 2023emq: A Flash-ionized Ibn Supernova with Possible C iii Emission-猫眼课题宝

DOI：

10.3847/2041-8213/ad103d

发表时间：

2023-06

期刊：

The Astrophysical Journal Letters

影响因子：

通讯作者：

中科院分区：

其他

文献类型：

作者：

M. Pursiainen;G. Leloudas;S. Schulze;P. Charalampopoulos;C. Angus;J. Anderson;F. Bauer;T.-W. Chen;L. Galbany;M. Gromadzki;C. P. Guti'errez;C. Inserra;J. Lyman;T. Müller-Bravo;M. Nicholl;S. Smartt;L. Tartaglia;P. Wiseman;D. Young

SN2023emq是一颗快速演化的瞬变天体，最初被归类为罕见的ICN超新星(SN)，它在最大光强附近与无氢和无氦的星际介质(CSM)相互作用。随后的光谱清楚地显示出狭窄的He谱线的出现，自信地将SN2023emq归入更常见的IbN类。在光度学上，SN 2023emq无论其类别如何，都具有几个不同寻常的特性，包括其极端的初始衰减(比IBN/ICN SNE类型的&gt；90%快)，以及在+20天从0.20mag day−1急剧过渡到0.07mag day。测辐射热光曲线可以模拟为CSM与喷射物的0.32M⊙和CSM的0.12M⊙，以及镍的0.006M⊙的相互作用，与快速相互作用的近地天体的预期一样。此外，+8.7天的宽带偏振(P=0.55%±0.30%)符合球面对称性。过渡型ICN/IBN SN的发现将是史无前例的，并将对祖先在死前遭受质量损失的性质提供有价值的见解，但我们倾向于这样一种解释，即SN 2023emq是一种在最早的光谱中表现出闪电离特征的IBN SN，因为到目前为止这些特征与其他类型的ICN SNE并不完全匹配。然而，SN2023emq在C III和N II发射区域的5700ä的特征明显强于其他几种闪电离型Ibn SNE，如果它与C III有关，它可能意味着这两个类别之间的性质的连续体。

SN 2023emq is a fast-evolving transient initially classified as a rare Type Icn supernova (SN), interacting with a H- and He-free circumstellar medium (CSM) around maximum light. Subsequent spectroscopy revealed the unambiguous emergence of narrow He lines, confidently placing SN 2023emq in the more common Type Ibn class. Photometrically, SN 2023emq has several uncommon properties regardless of its class, including its extreme initial decay (faster than >90% of Type Ibn/Icn SNe) and sharp transition in the decline rate from 0.20 to 0.07 mag day−1 at +20 days. The bolometric light curve can be modeled as CSM interaction with 0.32M ⊙ of ejecta and 0.12M ⊙ of CSM, with 0.006M ⊙ of nickel, as expected of fast, interacting SNe. Furthermore, broadband polarimetry at +8.7 days (P = 0.55% ± 0.30%) is consistent with spherical symmetry. A discovery of a transitional Type Icn/Ibn SN would be unprecedented and would give valuable insights into the nature of mass loss suffered by the progenitor just before death, but we favor an interpretation that SN 2023emq is a Type Ibn SN that exhibited flash-ionized features in the earliest spectrum, as the features are not an exact match with other Type Icn SNe to date. However, the feature at 5700 Å, in the region of C iii and N ii emission, is significantly stronger in SN 2023emq than in the few other flash-ionized Type Ibn SNe, and if it is related to C iii, it possibly implies a continuum of properties between the two classes.

SN 2023emq: A Flash-ionized Ibn Supernova with Possible C iii Emission

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