Signatures of Type Ia Supernovae Explosions and their Cosmological Implications

Ia 型超新星爆炸的特征及其宇宙学意义

• 批准号: 1715133
• 负责人: Peter Hoeflich
• 金额: $ 42.12万
• 依托单位: Florida State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2017
• 资助国家: 美国
• 起止时间: 2017-08-15 至 2022-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1715133&HistoricalAwards=false
• 关键词: Signatures; Type; Ia; Supernovae; Explosions

Studying the cosmological expansion of the Universe requires precise determination of distances to faraway galaxies. One of the ways that astronomers do this is by using a certain type of supernova (SN), or exploding star, in a galaxy as a measuring stick. A Type Ia SN results from the detonation of an old, small white dwarf (WD) star, and because WD stars are fairly similar in size, the observable features of Type Ia SNe are similar, meaning that the relative difference in brightness between two Type Ia SNe in different galaxies is primarily due to a difference in distance. For this method to work properly to advance cosmology, it is essential that astronomers have a better understanding of the details of Type Ia SNe and the differences among them. A research group at Florida State University (FSU) will further this understanding by studying in detail the various Type Ia explosion scenarios, the structure of WD stars, the thermodynamics of the explosions, and the role of magnetic fields in supernovae. They will do this through sophisticated computer models that produce simulated SNe to compare to observations. The research team will include both graduate and undergraduate students, and the principal investigator and his team will develop and present shows at the FSU planetarium about SNe, cosmology, and related astronomy topics.Thermonuclear explosions of white dwarfs, SNe Ia, are key in cosmology due to their brightness and the apparent homogeneity of their light curves. However, the diversity of explosion scenarios and possible WD progenitor evolution with redshift pose a problem for high precision cosmology. Explosion scenarios may include a WD explosion close to the Chandrasekhar mass (M_Ch), a sub-M_Ch WD, and the dynamical merger of two WDs. For all scenarios, the team will use existing and new explosion models to calculate non-local thermodynamic equilibrium light curves, color-brightness relations, and near and mid-infrared spectra. They will use the radiation-hydro code HYDRA and include hydrodynamics and positron transport. Tools will be developed and employed for data analysis using existing observations as a benchmark.

研究宇宙的宇宙学膨胀需要精确测定到遥远星系的距离。 天文学家的方法之一是使用某种类型的超新星（SN），或星系中的爆炸星星作为测量标尺。 Ia型超新星是由一颗古老的小白色矮星（WD）星星爆炸而成，由于WD恒星的大小相当相似，Ia型超新星的可观测特征也相似，这意味着不同星系中两颗Ia型超新星的亮度差异主要是由于距离的差异。 为了使这种方法正确地工作以推进宇宙学，天文学家必须更好地了解Ia型超新星的细节以及它们之间的差异。 佛罗里达州立大学（FSU）的一个研究小组将通过详细研究各种Ia型爆炸场景、WD恒星的结构、爆炸的热力学以及磁场在超新星中的作用来进一步理解这一点。 他们将通过复杂的计算机模型来实现这一点，该模型产生模拟SNe以与观测结果进行比较。 研究团队将包括研究生和本科生，首席研究员和他的团队将在FSU天文馆开发和展示SNe，宇宙学和相关天文学主题。白色矮星SNe Ia的热核爆炸由于其亮度和光变曲线的明显均匀性而在宇宙学中至关重要。 然而，爆炸场景的多样性和可能的WD祖演化红移提出了一个问题，高精度宇宙学。 爆炸场景可以包括接近M_Ch_1的WD爆炸、亚M_Ch_1 WD以及两个WD的动力学合并。 对于所有场景，该团队将使用现有的和新的爆炸模型来计算非局部热力学平衡光变曲线，颜色-亮度关系以及近红外和中红外光谱。 他们将使用辐射-水力代码HYDROGEN，包括流体动力学和正电子传输。 将开发和使用各种工具，以现有观测结果为基准进行数据分析。

项目成果

Carnegie Supernova Project-II: A New Method to Photometrically Identify Sub-types of Extreme Type Ia Supernovae

• DOI: 10.3847/2041-8213/ab8e37
• 发表时间: 2020-03
• 期刊: The Astrophysical Journal Letters
• 作者: C. Ashall;J. Lu;C. Burns;E. Hsiao;M. Stritzinger;N. Suntzeff;M. Phillips;E. Baron;C. Contreras;S. Davis;L. Galbany;P. Hoeflich;S. Holmbo;N. Morrell;E. Karamehmetoglu;K. Krisciunas;S. Kumar;M. Shahbandeh;S. Uddin

The Carnegie Supernova Project-I: Correlation between Type Ia Supernovae and Their Host Galaxies from Optical to Near-infrared Bands

• DOI: 10.3847/1538-4357/abafb7
• 发表时间: 2020-06
• 期刊: The Astrophysical Journal
• 作者: S. Uddin;C. Burns;M. Phillips;N. Suntzeff;C. Contreras;E. Hsiao;N. Morrell;L. Galbany;M. Stritzinger;P. Hoeflich;C. Ashall;A. Piro;W. Freedman;S. E. Persson;K. Krisciunas;P. Brown

The shape of SN 1993J re-analysed

• DOI: 10.1093/mnras/staa721
• 发表时间: 2020-03
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: H. Stevance;H. Stevance;D. Baade;J. Bruten;A. Cikota;A. Clocchiatti;D. Hines;P. Höflich;J. Maund;F. Patat;P. Vallely;J. C. Wheeler

RINGO3 polarimetry of very young ZTF supernovae

非常年轻的 ZTF 超新星的 RINGO3 偏振测量

• DOI: 10.1093/mnras/stab391
• 发表时间: 2021-02
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: Maund J. R.;Yang Y.;Steele I. A.;Baade D.;Jermak H.;Schulze S.;Bruch R.;Gal-Yam A.;Hoflich P. A.;Ofek E.;Wang X.;Amenouche M.;Dekany R.;Masci F. J.;Riddle R.;Soumagnac M. T.
• 通讯作者: Soumagnac M. T.

Late-time Flattening of Type Ia Supernova Light Curves: Constraints from SN 2014J in M82

Ia 型超新星光曲线的后期平坦化：M82 中 SN 2014J 的限制

• DOI: 10.3847/1538-4357/aa9e4c
• 发表时间: 2017-04
• 期刊: Astrophysical Journal
• 影响因子: 4.9
• 作者: Yang Yi et al.