Supernovae and their Environments

超新星及其环境

• 批准号: 4997-2013
• 负责人: Pritchet, Chris
• 金额: $ 1.46万
• 依托单位: University of Victoria
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2017
• 资助国家: 加拿大
• 起止时间: 2017-01-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=633436
• 关键词: Supernovae; their; Environments

Supernovae are among the most energetic transient objects in the Universe. They briefly outshine entire galaxies of stars, and are responsible for the formation of almost all of the heavy elements. They dominate the energetics of the interstellar medium. Type Ia supernovae are arguably the most accurate cosmological probes for studying dark energy.In this proposal we will explore the many implications of the recently developed "white dwarf lifetime" model that explains the dependence of supernova rate on star formation rate. We will determine the delay time distribution of supernovae, a function that characterizes and constrains the nature of the stars that ultimately become supernovae. We will also extend our work to Type II supernovae (massive stars undergoing core collapse) in very luminous obscured galaxies known as ULIRGs. We will study the systematics of supernovae in different galaxy environments (clusters, radio galaxies, far infrared emitters). Finally we will improve the calibration of supernovae as distance indicators; this should lead to a better understanding of the nature of the elusive dark energy that dominates the expansion dynamics of the Universe.

超新星是宇宙中能量最高的瞬变天体之一。它们短暂地闪耀着整个恒星星系，并对几乎所有重元素的形成负责。它们主导着星际介质的能量学。Ia型超新星可以说是研究暗能量最准确的宇宙学探测器。在这个方案中，我们将探索最近发展的“白矮星寿命”模型的许多含义，该模型解释了超新星速率与恒星形成速率的关系。我们将确定超新星的延迟时间分布，这是一个描述和约束最终成为超新星的恒星的性质的函数。我们还将把我们的工作扩展到被称为ULIRGs的非常明亮的昏暗星系中的II型超新星(正在经历核心塌缩的大质量恒星)。我们将研究超新星在不同星系环境(星系团、射电星系、远红外发射体)中的系统学。最后，我们将改进超新星作为距离指示器的校准；这应该会导致更好地理解主导宇宙膨胀动力学的难以捉摸的暗能量的本质。