CANCELLED !!! Dr. Oleg Korobkin, Los Alamos National Laboratory
Wann: Mi, 07.12.2022, 14:00 Uhr
Wo: Gojenbergsweg 112, 21029 Hamburg
Kilonovae: Effects of Ejecta Asphericity
Kilonovae from neutron star mergers such as AT2017gfo, the counterpart of GW170817, admit a broad range of estimates for their masses and compositions. While the models that are used for kilonova interpretation may agree qualitatively, they yield estimates for the ejecta properties, such as the mass of the r-process, which differ by orders of magnitude. I will review how removing the assumption of ejecta sphericity, in conjunction with having multiple components in the ejecta, may further blur these estimates. It appears that aspherical nature of the ejecta has major impacts on both spectra and light curves. For a given value of total ejecta mass and the median expansion velocity, variation in the range of morphology uncertainty results in the peak luminosity varying by almost two orders of magnitude, while the peak time by a factor of five. Highly diverse set of light curves can be observed due to various radiative multicomponent effects influencing the spectra, such as blocking, flux redirection and double reprocessing. There are some geometry-dependent P Cygni features in late spectra that directly map to strong lines in the simulated opacity of lanthanides and actinides, which may help to not only constrain the ejecta geometry but also to directly probe the r-process abundances.
Talk CANCELLED !!!