SN 2013aa and SN 2017cbv: Two Sibling Type Ia Supernovae in the Spiral Galaxy NGC 5643
SN 2013aa and SN 2017cbv: Two Sibling Type Ia Supernovae in the Spiral Galaxy NGC 5643
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DOI：
10.3847/1538-4357/ab8e3e
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发表时间：
2020-04
期刊：
影响因子：
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通讯作者：
C. Burns;C. Ashall;C. Contreras;P. Brown;M. Stritzinger;M. Phillips;R. Flores;N. Suntzeff;E. Hsiao;S. Uddin;J. Simon;K. Krisciunas;A. Campillay;R. Foley;W. Freedman;L. Galbany;C. Gonz'alez;P. Hoeflich;S. Holmbo;C. Kilpatrick;R. Kirshner;N. Morrell;N. Muñoz-Elgueta;A. Piro;C. Rojas-Bravo;D. Sand;Jaime Vargas-Gonz'alez;N. Ulloa;J. Vilchez
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文献类型：
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作者：
C. Burns;C. Ashall;C. Contreras;P. Brown;M. Stritzinger;M. Phillips;R. Flores;N. Suntzeff;E. Hsiao;S. Uddin;J. Simon;K. Krisciunas;A. Campillay;R. Foley;W. Freedman;L. Galbany;C. Gonz'alez;P. Hoeflich;S. Holmbo;C. Kilpatrick;R. Kirshner;N. Morrell;N. Muñoz-Elgueta;A. Piro;C. Rojas-Bravo;D. Sand;Jaime Vargas-Gonz'alez;N. Ulloa;J. Vilchez
我们展示了 SN 2013aa 和 SN 2017cbv 的光度和光谱观测结果，这是宿主星系 NGC 5643 中两颗几乎相同的 Ia 型超新星 (SNe Ia)。光学光度测量是使用卡内基超新星项目使用的相同望远镜和仪器获得的。这消除了大多数仪器系统，并在稳定且易于理解的光度系统中提供光曲线。拥有相同的宿主星系还消除了由于距离和特殊速度而导致的系统性，从而提供了直接测试超新星 Ia 作为标准烛光的相对精度的机会。这两个超新星具有几乎相同的衰减率、可忽略不计的红化和非常相似的光谱，并且在距离约为 20 Mpc 时，它们是使用造父变星等主要指标进行绝对距离的理想潜在校准器。我们讨论这两个超新星在多大程度上可以被视为双胞胎，并将它们与文献中的其他超新星“兄弟姐妹”及其可能的祖先场景进行比较。使用拥有两个或更多 SNe Ia 的 12 个星系，我们发现，当使用 SNe Ia 时，在考虑了所有观测误差来源后，距离的一致性达到 3%。
We present photometric and spectroscopic observations of SN 2013aa and SN 2017cbv, two nearly identical type Ia supernovae (SNe Ia) in the host galaxy NGC 5643. The optical photometry has been obtained using the same telescope and instruments used by the Carnegie Supernova Project. This eliminates most instrumental systematics and provides light curves in a stable and well-understood photometric system. Having the same host galaxy also eliminates systematics due to distance and peculiar velocity, providing an opportunity to directly test the relative precision of SNe Ia as standard candles. The two SNe have nearly identical decline rates, negligible reddenings, and remarkably similar spectra, and, at a distance of ∼20 Mpc, they are ideal potential calibrators for the absolute distance using primary indicators such as Cepheid variables. We discuss to what extent these two SNe can be considered twins and compare them with other supernova “siblings” in the literature and their likely progenitor scenarios. Using 12 galaxies that hosted two or more SNe Ia, we find that when using SNe Ia, and after accounting for all sources of observational error, one gets consistency in distance to 3%.