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

Published online by Cambridge University Press:  23 June 2017

Ataru Tanikawa ,
Yushi Sato ,
Ken’ichi Nomoto ,
Keiichi Maeda ,
Naohito Nakasato  and
Izumi Hachisu
Ataru Tanikawa
Affiliation:
1Department of Earth Science and Astronomy, College of Arts and Sciences, The University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153-8902, Japan; tanikawa@ea.c.u-tokyo.ac.jp RIKEN Advanced Institute for Computational Science, 7-1-26 Minatojima-minami-machi, Chuo-ku, Kobe, Hyogo 650-0047, Japan
Yushi Sato
Affiliation:
1Department of Earth Science and Astronomy, College of Arts and Sciences, The University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153-8902, Japan; tanikawa@ea.c.u-tokyo.ac.jp Department of Astronomy, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
Ken’ichi Nomoto
Affiliation:
Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8583, Japan Hamamatsu Professor
Keiichi Maeda
Affiliation:
Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8583, Japan Department of Astronomy, Kyoto University, Kitashirakawa-Oiwake-cho, Sakyo-ku, Kyoto 606-8502, Japan
Naohito Nakasato
Affiliation:
Department of Computer Science and Engineering, University of Aizu, Tsuruga Ikki-machi Aizu-Wakamatsu, Fukushima 965-8580, Japan
Izumi Hachisu
Affiliation:
1Department of Earth Science and Astronomy, College of Arts and Sciences, The University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153-8902, Japan; tanikawa@ea.c.u-tokyo.ac.jp
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Abstract

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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.

Keywords

hydrodynamicsnuclear reactionsnucleosynthesiswhite dwarfs
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 12 , Symposium S324: New Frontiers in Black Hole Astrophysics , September 2016 , pp. 136 - 137
Copyright
Copyright © International Astronomical Union 2017 

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