Towards an understanding of long gamma-ray burst environments through circumstellar medium population synthesis predictions

0566058 - FZÚ 2023 RIV GB eng J - Článek v odborném periodiku
Chrimes, A.A. - Gompertz, B.P. - Kann, D.A. - van Marle, Allard Jan - Eldridge, A.J. - Groot, P.J. - Laskar, T. - Levan, A.J. - Nicholl, M. - Stanway, E.R. - Wiersema, K.
Towards an understanding of long gamma-ray burst environments through circumstellar medium population synthesis predictions.
Monthly Notices of the Royal Astronomical Society. Roč. 515, č. 2 (2022), s. 2591-2611. ISSN 0035-8711. E-ISSN 1365-2966
Institucionální podpora: RVO:68378271
Klíčová slova: γ -ray burst * general – stars * winds * outflows – star * Wolf–Rayet
Obor OECD: Fluids and plasma physics (including surface physics)
Impakt faktor: 4.8, rok: 2022
Způsob publikování: Omezený přístup
https://doi.org/10.1093/mnras/stac1796

The temporal and spectral evolution of gamma-ray burst (GRB) afterglows can be used to infer the density and density profile of the medium through which the shock is propagating. In long-duration (core-collapse) GRBs, the circumstellar medium (CSM) is expected to resemble a wind-blown bubble, with a termination shock, separating the stellar wind and the interstellar medium (ISM). A long standing problem is that flat density profiles, indicative of the ISM, are often found at lower radii than expected for a massive star progenitor. Furthermore, the presence of both wind-like environments at high radii and ISM-like environments at low radii remains a mystery. In this paper, we perform a ‘CSM population synthesis’ with long GRB progenitor stellar evolution models. Analytic results for the evolution of wind blown bubbles are adjusted through comparison with a grid of 2D hydrodynamical simulations. Predictions for the emission radii, ratio of ISM to wind-like environments, wind, and ISM densities are compared with the largest sample of afterglow derived parameters yet compiled, which we make available for the community.
Trvalý link: https://hdl.handle.net/11104/0337497