Constraining cosmological parameter with SN Ia

International Symposium on Sun, Earth, and Life

物理学;天文学;生物科学

Putri, A.N. Indra^1 ; Wulandari, H.R. Tri^1

Astronomy Department, Faculty of Mathematics and Natural Sciences, Bandung Institute of Technology, Indonesia^1

关键词: Binary systems;    Cosmological constants;    Cosmological parameters;    Dark energy;    Light curves;    Luminous objects;    Measuring tools;    Solar mass;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/771/1/012056/pdf
DOI  :  10.1088/1742-6596/771/1/012056

来源: IOP

【 摘 要 】

A type I supemovae (SN Ia) is an exploding white dwarf, whose mass exceeds Chandrasekar limit (1.44 solar mass). If a white dwarf is in a binary system, it may accrete matter from the companion, resulting in an excess mass that cannot be balanced by the pressure of degenerated electrons in the core. SNe Ia are highly luminous objects, that they are visible from very high distances. After some corrections (stretch (s), colour (c), K-corrections, etc.), the variations in the light curves of SNe Ia can be suppressed to be no more than 10%. Their high luminosity and almost uniform intrinsic brightness at the peak light, i.e. MB∼ -19, make SNe Ia ideal standard candle. Because of their visibility from large distances, SNe Ia can be employed as a cosmological measuring tool. It was analysis of SNe Ia data that indicated for the first time, that the universe is not only expanding, but also accelerating. This work analyzed a compilation of SNe Ia data to determine several cosmological parameters (H0, Ωm, Ωa, and w). It can be concluded from the analysis, that our universe is a flat, dark energy dominated universe, and that the cosmological constant A is a suitable candidate for dark energy.