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Explosive nucleosynthesis in tidal disruption events of massive white dwarfs, and their debris

  • Ataru Tanikawa (a1) (a2), Yushi Sato (a1) (a3), Ken’ichi Nomoto (a4) (a5), Keiichi Maeda (a4) (a6), Naohito Nakasato (a7) and Izumi Hachisu (a1)...
Abstract

We perform SPH simulations coupled with nuclear reactions to follow tidal disruption events (TDEs) of white dwarfs (WDs) by intermediate mass black holes (IMBHs). We consider an oxygen-neon-magnesium (ONeMg) WD with 1.2M as well as a helium (He) WD with 0.3M , and a carbon-oxygen (CO) WD with 0.6M . Our WD models have different numbers of SPH particles, N, up to a few 10 million. We find that nucleosynthesis does not converge against N even for N > 107. For all the WDs, the amount of radioactive nuclei, such as 56Ni, decreases with increasing N. Nuclear reactions might be extinguished for infinitely large N. Our results show that these kinds of TDEs, if solely powered by radioactive decays, are much dimmer optical transients similar to Type Ia supernovae as previously suggested.

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Rosswog, S., Ramirez-Ruiz, E., & Hix, W. R. 2009, ApJ, 695, 404
Rosswog, S., Ramirez-Ruiz, E., Hix, W. R., & Dan, M. 2008, Computer Physics Communications, 179, 184
Tejeda, E., & Rosswog, S. 2013, MNRAS, 433, 1930
Timmes, F. X., Hoffman, R. D., & Woosley, S. E. 2000, ApJS, 129, 377
Timmes, F. X. & Swesty, F. D. 2000, ApJS, 126, 501
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Proceedings of the International Astronomical Union
  • ISSN: 1743-9213
  • EISSN: 1743-9221
  • URL: /core/journals/proceedings-of-the-international-astronomical-union
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