TY - JOUR
T1 - Radiative Transfer Simulation for the Optical and Near-infrared Electromagnetic Counterparts to GW170817
AU - Kawaguchi, Kyohei
AU - Shibata, Masaru
AU - Tanaka, Masaomi
N1 - Funding Information:
We thank S. Fujibayashi, K. Hotokezaka, and E. Waxman for valuable discussions. Numerical computation was performed on Cray XC30 at Center for Computational Astrophysics of National Astronomical Observatory of Japan and on Hydra at Max Planck Computing and Data Facility. This work was supported by Grant-in-Aid for Scientific Research (JP16H02183, JP16H06342, JP17H01131, JP15K05077, JP17K05447, JP17H06361, JP15H02075, JP17H06363) of JSPS and by a post-K computer project (Priority issue No. 9) of Japanese MEXT. K.K. was supported by JSPS overseas research fellowships.
Publisher Copyright:
© 2018. The American Astronomical Society. All rights reserved..
PY - 2018/10/1
Y1 - 2018/10/1
N2 - Recent detection of gravitational waves from a binary neutron star merger (GW170817) and the subsequent observations of electromagnetic counterparts provide a great opportunity to study the physics of compact binary mergers. The optical and near-infrared counterparts to GW170817 (SSS17a, also known as AT 2017gfo or DLT17ck) are found to be consistent with a kilonova/macronova scenario with red and blue components. However, in most previous studies wherein the contribution from each ejecta component to the lightcurves is separately calculated and composited, the red component is too massive of a dynamical ejecta, and the blue component is too fast of a post-merger ejecta. In this Letter, we perform a two-dimensional radiative transfer simulation for a kilonova/macronova, consistently taking the interplay of multiple ejecta components into account. We show that the lightcurves and photospheric velocity of SSS17a can be reproduced naturally by a setup that is consistent with the prediction of the numerical-relativity simulations.
AB - Recent detection of gravitational waves from a binary neutron star merger (GW170817) and the subsequent observations of electromagnetic counterparts provide a great opportunity to study the physics of compact binary mergers. The optical and near-infrared counterparts to GW170817 (SSS17a, also known as AT 2017gfo or DLT17ck) are found to be consistent with a kilonova/macronova scenario with red and blue components. However, in most previous studies wherein the contribution from each ejecta component to the lightcurves is separately calculated and composited, the red component is too massive of a dynamical ejecta, and the blue component is too fast of a post-merger ejecta. In this Letter, we perform a two-dimensional radiative transfer simulation for a kilonova/macronova, consistently taking the interplay of multiple ejecta components into account. We show that the lightcurves and photospheric velocity of SSS17a can be reproduced naturally by a setup that is consistent with the prediction of the numerical-relativity simulations.
KW - gravitational waves
KW - nuclear reactions, nucleosynthesis, abundances
KW - radiative transfer
KW - stars: neutron
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U2 - 10.3847/2041-8213/aade02
DO - 10.3847/2041-8213/aade02
M3 - Article
AN - SCOPUS:85054338774
SN - 2041-8205
VL - 865
JO - Astrophysical Journal Letters
JF - Astrophysical Journal Letters
IS - 2
M1 - L21
ER -