Astrophysics of Compact Objects and Their Origin in Supernova and Supernova Remnants

主要目的是了解致密天体的性质及其在超新星中的爆炸形成。 为了实现这一目标，将对双星中的中子星进行观测和建模研究，目的是测量质量-半径，以约束致密物质的状态方程。对X射线双星中吸积流的研究将有助于进一步了解致密天体与其环境之间的相互作用，以及了解依赖于 双星之间的质量传递。为了了解致密天体的形成，将对超新星和超新星残留物进行观测和理论/模型研究。作为确定星系超新星遗迹物理性质的一部分，将分析氢线吸收观测以确定距离，并将获得X射线光谱数据并对其进行建模以确定热等离子体的状态。 我参与了即将发射的ASTROSAT X射线/UV/光学天文台紫外线(UV)望远镜的硬件和软件的开发，并计划通过观测致密天体、超新星和超新星遗迹来参与ASTROSAT的科学计划。 中子星是否可以包含或完全由物质的夸克相组成的问题是一个悬而未决的问题。为此，将对夸克星的可观测性质进行研究。这包括确定由Oued和Leahy开发的软伽马射线中继器(SGR)和反常X射线脉冲星(AXP)的吸积夸克星模型是否能一致地描述新的观测结果。与致密天体形成相关的研究还包括研究中子星到夸克星(夸克新星)的爆炸性转化是否可以解释一些罕见的超新星中的超光速超新星和核合成。

The main goal is to understand the nature of compact objects and their explosive formation in supernovae. To achieve this, observation and modeling studies of neutron stars in binaries will be carried out, with the aim of mass-radius measurement for constraining the equation-of-state of dense matter. Studies of the accretion flow in X-ray binaries will enable further understanding of the interaction between the compact object and its environment, as well as understanding the evolution of binary systems which depends on mass transfer between the stars in a binary. To understand formation of compact objects, observational and theoretical/modeling studies of supernovae and supernovae remnants will be carried out. As part of determining physical properties of galactic supernovae remnants, hydrogen-line absorption observations will be analyzed to determine distances and X-ray spectroscopic data will be obtained and modeled to determine the state of the hot plasma. I participated in the development of hardware and software for the ultraviolet(UV) telescope on the soon-to-be-launched ASTROSAT X-ray/UV/optical observatory, and I plan to participate in the science program of ASTROSAT by observing compact objects, supernovae and supernova remnants. The question of whether neutron stars can contain or be entirely composed of the quark phase of matter is an open question. For this, research on the observable properties of quark stars will be carried out. This includes determination if the accreting-quark-star model for Soft Gamma-ray Repeaters(SGRs) and Anomalous X-ray Pulsars(AXPs), developed by Ouyed and Leahy, can consistently describe new observations. Related to compact object formation, it also includes studying whether the explosive conversion of a neutron star into a quark star (the quark nova) can explain super-luminous supernovae and nucleosythesis in some rare supernovae.