Multidimensional Radiation-Hydrodynamic Simulations of Core-Collapse Supernovae, Winds from Oblate Hot Stars, and Explosions of Rapidly-Rotating Stars

耶利米·墨菲博士被授予美国国家科学基金会天文学和天体物理学博士后奖学金，在华盛顿大学开展研究和教育项目。墨菲博士将完成Bethe的开发，这是一个多角度、多能量组、多维、依赖时间的辐射-流体力学程序。辐射流体力学是天体物理学的核心课题，对于许多现象来说，非球面性要么伴随着基础理论，要么是基础理论的基础。Bethe采用了新颖的混合帧辐射传输，实现简单，可推广到多个维度，准确且相对快速。流体力学求解器是一种任意拉格朗日-欧拉(ALE)方法，并使用任意网格，提供了灵活性来定制网格以适应计算挑战。总而言之，这些特征允许对天体物理现象进行独特的多维模拟。特别是，墨菲博士将(1)探讨中微子和声学机制对核心坍塌超新星的可行性，(2)模拟扁平热星的风，(3)研究拟议的发光蓝变量爆发机制是否可以在快速旋转的恒星背景下重现船底座人的观测结果。墨菲还将积极参与天文学专业预科项目(Pre-MAP)，该项目旨在留住华盛顿大学天文学系的多样化学生群体。Pre-MAP针对的是来自传统上在科学界代表性较低的群体(女性、第一代和低收入大学生、非裔美国人、拉美人、美洲原住民、东南亚人和太平洋岛民)的一年级学生，主要目标有两个：通过研究激发学生的兴趣和热情，并提供一个支持他们的社区，使他们能够取得成功。墨菲博士的角色将是指导地图绘制前的学生，提供模拟结果以供分析，支持实地考察和研究，最重要的是评估和改进该项目。

Dr. Jeremiah Murphy is awarded an NSF Astronomy and Astrophysics Postdoctoral Fellowship to carry out a program of research and education at the University of Washington. Dr. Murphy will complete development of BETHE, a multi-angle, multi-energy-group, multidimensional, time-dependent radiation-hydrodynamics code. Radiation hydrodynamics is a core subject in astrophysics, and for many phenomena asphericities either accompany or are fundamental to the underlying theory. BETHE uses novel mixed-frame radiation transport that is straightforward to implement, generalizable to multiple dimensions, accurate and relatively fast. The hydrodynamics solver is an Arbitrary Lagrangian-Eulerian (ALE) method and uses arbitrary grids providing flexibility to tailor the grid to the computational challenge. Together, these characteristics allow for unique multidimensional simulations of astrophysical phenomena. In particular, Dr. Murphy will (1) address the viability of the neutrino and acoustic mechanisms for core-collapse supernovae, (2) simulate winds from oblate hot stars, and (3) investigate whether proposed mechanisms for luminous-blue-variable outbursts can reproduce, in the context of rapidly rotating stars, the observations of Eta Carinae's Homunculus.Dr. Murphy will also be actively involved with the Pre-Major in Astronomy Program (Pre-MAP), which seeks to retain a diverse student body in the University of Washington Astronomy Department. Pre-MAP targets first-year students from traditionally underrepresented groups in the sciences (women, first-generation and low-income college students, African Americans, Latinos, Native Americans, Southeast Asians and Pacific Islanders) with two primary goals: to engage students' interest and enthusiasm through research and to provide a supportive community, enabling their success. Dr. Murphy's roles will be to mentor Pre-MAP students, to offer simulation results to analyze, to support field trips and research, and, most importantly, to evaluate and improve the program.