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Transient AT2018cow: A Scenario with an Equatorial Disk

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Abstract

To explain the presence of early X-ray emission from the object AT2018cow, we have studied a scenario with the presence of dense ejecta in the system in the equatorial plane. Based on a simplified one-dimensional model, we have developed a two-dimensional model with a dense equatorial disk in the system. As a result of two-dimensional radiation-hydrodynamics simulations with the multidimensional parallel FRONT code, we have shown that the shock wave propagates through such a disk more slowly than through the original low-density cloud and gives rise to a high-temperature region visible in X-rays in a certain range of viewing angles.

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ACKNOWLEDGMENTS

E.M. Urvachev and S.I. Blinnikov thank the Russian Science Foundation (project no. 19-12-00229) for supporting the radiation-hydrodynamics simulations of AT2018cow. We are extremely grateful to E.I. Sorokina for the discussion of the initial models for AT2018cow.

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Authors and Affiliations

  1. Dukhov Research Institute of Automatics, 127055, Moscow, Russia

    E. M. Urvachev & S. I. Blinnikov

  2. National Research Center ‘‘Kurchatov Institute’’—ITEP, 123182, Moscow, Russia

    E. M. Urvachev & S. I. Blinnikov

  3. Sternberg Astronomical Institute, Moscow State University, 119234, Moscow, Russia

    S. I. Blinnikov

  4. Kavli Institute for the Physics and Mathematics of the Universe (WPI), University of Tokyo, Kashiwa, Japan

    S. I. Blinnikov & K. Nomoto

Authors
  1. E. M. Urvachev
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  2. S. I. Blinnikov
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  3. K. Nomoto
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Correspondence to E. M. Urvachev.

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Translated by V. Astakhov

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Urvachev, E.M., Blinnikov, S.I. & Nomoto, K. Transient AT2018cow: A Scenario with an Equatorial Disk. Astron. Lett. 47, 738–745 (2021). https://doi.org/10.1134/S1063773721110074

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  • DOI: https://doi.org/10.1134/S1063773721110074

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