Discovery of An Apparent Red, High-Velocity Type Ia Supernova at z = 2.9 with JWST
J. D. R. Pierel, M. Engesser, D. A. Coulter, C. Decoursey, M. R. Siebert, A. Rest, E. Egami, W. Chen, O. D. Fox, D. O. Jones, B. A. Joshi, T. J. Moriya, Y. Zena… 展开作者
J. D. R. Pierel, M. Engesser, D. A. Coulter, C. Decoursey, M. R. Siebert, A. Rest, E. Egami, W. Chen, O. D. Fox, D. O. Jones, B. A. Joshi, T. J. Moriya, Y. Zenati, A. J. Bunker, P. A. Cargile, M. Curti, D. J. Eisenstein, S. Gezari, S. Gomez, M. Guolo, B. D. Johnson, M. Karmen, R. Maiolino, Robert M. Quimby, B. Robertson, M. Shahbandeh, L. G. Strolger, F. Sun, Q. Wang, T. Wevers
本文报告了 JWST 在 z=2.9 处发现的偏红、高速 Ia 型超新星 SN 2023adsy，证明其可标准化且光度距离与 ΛCDM 一致，表明 Ia 型超新星标准化光度可能不随红移显著变化。
摘要：
我们报告了 JWST 对 SN 2023adsy 的发现，这是一个位于宿主星系 JADES-GS+53.13485-27.82088 中的暂现天体，其宿主星系光谱红移为 2.903±0.007。该暂现天体是在 JWST 先进深场河外巡天（JADES）项目获得的深度詹姆斯·韦布空间望远镜（JWST）/NIRCam 图像中被识别出来的。分别利用 NIRCam 和 NIRSpec 进行的光度与光谱后续观测确认了该红移，并给出了紫外-近红外光变曲线、近红外颜色和光谱信息，所有这些都与 Ia 型分类一致。尽管 SN 2023adsy 很可能属于 Ia 型超新星，但它相当偏红（E(B-V)~0.9），而其宿主星系却具有低消光，并且与 Ia 型超新星总体相比具有较高的 Ca II 速度（19,000±2,000 km/s）。虽然这些特征与一些富钙 Ia 型超新星一致，尤其是 SN 2016hnk，但 SN 2023adsy 本质上比低红移富钙群体更亮。尽管这样一个天体对任何低红移宇宙学样本来说都过于偏红，我们对 SN 2023adsy 应用了一种基准标准化方法，发现 SN 2023adsy 的光度距离测量与 ΛCDM 模型高度一致（≲1σ）。因此，与低红移富钙 Ia 型超新星不同，SN 2023adsy 是可标准化的，并且没有迹象表明 Ia 型超新星的标准化光度会随红移发生显著变化。需要更大的遥远 Ia 型超新星样本来确定高红移 Ia 型超新星群体特征是否真的与其低红移对应体不同，并确认标准化光度仍然随红移保持不变。
英文摘要：
We present the JWST discovery of SN 2023adsy, a transient object located in a host galaxy JADES-GS$+53.13485$$-$$27.82088$ with a host spectroscopic redshift of $2.903\pm0.007$. The transient was identified in deep James Webb Space Telescope (JWST)/NIRCam imaging from the JWST Advanced Deep Extragalactic Survey (JADES) program. Photometric and spectroscopic followup with NIRCam and NIRSpec, respectively, confirm the redshift and yield UV-NIR light-curve, NIR color, and spectroscopic information all consistent with a Type Ia classification. Despite its classification as a likely SN Ia, SN 2023adsy is both fairly red (E(B-V)$\sim0.9$) despite a host galaxy with low-extinction and has a high Ca II velocity ($19,000\pm2,000$km/s) compared to the general population of SNe Ia. While these characteristics are consistent with some Ca-rich SNe Ia, particularly SN 2016hnk, SN 2023adsy is intrinsically brighter than the low-z Ca-rich population. Although such an object is too red for any low-z cosmological sample, we apply a fiducial standardization approach to SN 2023adsy and find that the SN 2023adsy luminosity distance measurement is in excellent agreement ($\lesssim1σ$) with $Λ$CDM. Therefore unlike low-z Ca-rich SNe Ia, SN 2023adsy is standardizable and gives no indication that SN Ia standardized luminosities change significantly with redshift. A larger sample of distant SNe Ia is required to determine if SN Ia population characteristics at high-z truly diverge from their low-z counterparts, and to confirm that standardized luminosities nevertheless remain constant with redshift.
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MIT Kavli Institute for Astrophysics and Space Research（麻省理工学院卡弗里天体物理学与空间研究所）；Flatiron Institute（平顿研究所）；Princeton University（普林斯顿大学）；Institute of Science and Technology Austria (ISTA)（奥地利科学技术研究院）；The University of Texas at Austin（德克萨斯大学奥斯汀分校）；Center for Astrophysics, Harvard & Smithsonian（哈佛-史密森尼天体物理中心）；Max-Planck-Institut für Astronomie（马克斯·普朗克天文学研究所）；Tufts University（塔夫茨大学）；University of Toronto（多伦多大学）
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