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arXiv 2303.09548astro-ph.HE
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Ia型超新星晚期近红外平台的光度学研究

Photometric study of the late-time near-infrared plateau in Type Ia supernovae

M. Deckers, O. Graur, K. Maguire, L. Shingles, S. J. Brennan, J. P. Anderson, J. Burke, T. -W. Chen, L. Galbany, M. J. P. Grayling, C. P. Gutiérrez, L. Harvey, … 展开作者

M. Deckers, O. Graur, K. Maguire, L. Shingles, S. J. Brennan, J. P. Anderson, J. Burke, T. -W. Chen, L. Galbany, M. J. P. Grayling, C. P. Gutiérrez, L. Harvey, D. Hiramatsu, D. A. Howell, C. Inserra, T. Killestein, C. McCully, T. E. Müller-Bravo, M. Nicholl, M. Newsome, E. Padilla Gonzalez, C. Pellegrino, G. Terreran, J. H. Terwel, M. Toy, D. R. Young

摘要:

我们对Ia型超新星(SNe Ia)的晚期近红外平台进行了深入研究,该平台发生在70-500 d之间。我们将现有的超新星Ia样本在晚时间近红外高原期间观察到的新观测与哈勃太空望远镜,双子座,新技术望远镜,3.5米卡拉尔阿尔托望远镜和北欧光学望远镜。我们的样品由24个红移< 0.025的Ia超新星组成。我们能够证实,没有平台存在于Ks带的大多数正常SNe Ia。Ia型超新星在峰值处具有较宽的光学光变曲线,在J和H的平台上往往具有较高的平均亮度,这很可能是由于在前100 d中下降较浅。在H的平台期,在峰值时更明亮的Ia型超新星也显示出更陡的下降。我们比较我们的数据,以国家的最先进的辐射转移模型的星云超新星Ia在近红外。我们发现很好的协议与子Mch模型,降低了非热电离率,但没有物理理由降低这些利率尚未提出。在平台期间的光谱演变的分析表明,在近红外滤光器中的[Fe II]与[Fe III]贡献的比率决定了在所述滤光器中的光变曲线演变。我们发现,在平台期,过亮SNe的下降速度比正常SNe Ia的下降速度慢

英文摘要:

We present an in-depth study of the late-time near-infrared plateau in Type Ia supernovae (SNe Ia), which occurs between 70-500 d. We double the existing sample of SNe Ia observed during the late-time near-infrared plateau with new observations taken with the Hubble Space Telescope, Gemini, New Technology Telescope, the 3.5m Calar Alto Telescope, and the Nordic Optical Telescope. Our sample consists of 24 nearby SNe Ia at redshift < 0.025. We are able to confirm that no plateau exists in the Ks band for most normal SNe Ia. SNe Ia with broader optical light curves at peak tend to have a higher average brightness on the plateau in J and H, most likely due to a shallower decline in the preceding 100 d. SNe Ia that are more luminous at peak also show a steeper decline during the plateau phase in H. We compare our data to state-of-the-art radiative transfer models of nebular SNe Ia in the near-infrared. We find good agreement with the sub-Mch model that has reduced non-thermal ionisation rates, but no physical justification for reducing these rates has yet been proposed. An analysis of the spectral evolution during the plateau demonstrates that the ratio of [Fe II] to [Fe III] contribution in a near-infrared filter determines the light curve evolution in said filter. We find that overluminous SNe decline slower during the plateau than expected from the trend seen for normal SNe Ia

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