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arXiv 2102.02075astro-ph.SRastro-ph.GAastro-ph.HE
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核塌缩超新星内禀偏振的红外光谱偏振探测

Infrared Spectropolarimetric Detection of Intrinsic Polarization from a Core-Collapse Supernova

Samaporn Tinyanont, Maxwell Millar-Blanchaer, Mansi Kasliwal, Dimitri Mawet, Douglas C Leonard, Mattia Bulla, Kishalay De, Nemanja Jovanovic, Matthew Hankins, G… 展开作者

Samaporn Tinyanont, Maxwell Millar-Blanchaer, Mansi Kasliwal, Dimitri Mawet, Douglas C Leonard, Mattia Bulla, Kishalay De, Nemanja Jovanovic, Matthew Hankins, Gautam Vasisht, Eugene Serabyn

摘要:

大质量恒星以核心坍缩超新星(CCSN)的形式爆炸死亡。导致坍缩恒星反弹到爆炸的确切物理过程还没有得到很好的理解,解决这个问题的关键可能在于测量CCSNe喷出物的形状。分光偏振法是在银河系和麦哲伦云之外对CCSNe进行这种测量的唯一方法。我们提出了一个CCSN的红外(IR)光谱偏振检测,使新的高灵敏度WIRC+Pol仪器在帕洛玛天文台,可以观察CCSNe(M = -17马格斯)到20 Mpc的偏振精度~0.1%。红外光谱偏振比光学的影响较小的尘埃散射在拱星和星际介质,从而提供了一个更公正的探头的内在几何形状的SN喷出物。SN 2018 hna是一个类似SN 1987 A的爆炸,在爆炸后182 d,在天空中160 °方向的J波段上显示出2.0 ± 0.3%的连续偏振。假设像SN 1987 A中那样的扁长几何形状,我们推断出喷射物轴比<0.48,对称轴指向70度位置角。轴比与SN 1987 A相似,表明它们可能具有相同的固有几何形状和倾角。我们的数据并不排除扁圆状喷出物。我们还观察到另一个核心崩溃和两个热核SNe在J带。SN 2020 oi是M100中的一个Ic型剥层SN,在峰值光下p = 0.37+-0.09%,表示10%的不对称性或主星际偏振。SNe Ia、2019 ein和2020 ue在峰值光附近具有p < 0.33%和< 1.08%,分别指示小于10%和20%的不对称性。

英文摘要:

Massive stars die an explosive death as a core-collapse supernova (CCSN). The exact physical processes that cause the collapsing star to rebound into an explosion are not well-understood, and the key in resolving this issue may lie in the measurement of the shape of CCSNe ejecta. Spectropolarimetry is the only way to perform this measurement for CCSNe outside of the Milky Way and Magellanic Clouds. We present an infrared (IR) spectropolarimetric detection of a CCSN, enabled by the new highly sensitive WIRC+Pol instrument at Palomar Observatory, that can observe CCSNe (M = -17 mags) out to 20 Mpc to ~0.1% polarimetric precision. IR spectropolarimetry is less affected than optical by dust scattering in the circumstellar and interstellar media, thereby providing a more unbiased probe of the intrinsic geometry of the SN ejecta. SN 2018hna, a SN 1987A-like explosion, shows 2.0+-0.3% continuum polarization in the J band oriented at ~160 degree on-sky at 182 d after the explosion. Assuming prolate geometry like in SN 1987A, we infer an ejecta axis ratio of <0.48 with the axis of symmetry pointing at 70 degree position angle. The axis ratio is similar to that of SN 1987A suggesting that they may share intrinsic geometry and inclination angle. Our data do not rule out oblate ejecta. We also observe one other core-collapse and two thermonuclear SNe in the J band. SN 2020oi, a stripped-envelope Type Ic SN in Messier 100 has p = 0.37+-0.09% at peak light, indicative of either a 10% asymmetry or host interstellar polarization. The SNe Ia, 2019ein and 2020ue have p < 0.33% and < 1.08% near peak light, indicative of asymmetries of less than 10% and 20%, respectively.

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