5 years ago

High-resolution hydrodynamic simulation of tidal detonation of a helium white dwarf by an intermediate mass black hole.

Ataru Tanikawa

We demonstrate tidal detonation during a tidal disruption event (TDE) of a helium (He) white dwarf (WD) with $0.45M_\odot$ by an intermediate mass black hole (IMBH) by extremely high-resolution simulations. Tanikawa et al. (2017) have showed tidal detonation in previous studies results from unphysical heating due to low-resolution simulations, and such unphysical heating occurs in 3-dimensional (3D) smoothed particle hydrodynamics (SPH) simulations even with $10$ million SPH particles. In order to avoid such unphysical heating, we perform 3D SPH simulations up to $300$ million SPH particles, and 1D mesh simulations using flow structure in the 3D SPH simulations for 1D initial conditions. The 1D mesh simulations have higher resolution than the 3D SPH simulations. We show tidal detonation occurs, and confirm this result is perfectly converged with different space resolution in both 3D SPH and 1D mesh simulations. We find detonation waves independently arises in leading parts of the WD, and yield large amounts of $^{56}$Ni. Although detonation waves are not generated in trailing parts of the WD, the trailing parts receive detonation waves generated in the leading parts, and leave large amounts of Si group elements. Eventually, this He WD TDE would synthesize $^{56}$Ni of $0.30M_\odot$ and Si group elements of $0.08M_\odot$, and could be observed as a luminous thermonuclear transient comparable to type Ia supernovae.

Publisher URL: http://arxiv.org/abs/1711.05451

DOI: arXiv:1711.05451v1

You might also like
Discover & Discuss Important Research

Keeping up-to-date with research can feel impossible, with papers being published faster than you'll ever be able to read them. That's where Researcher comes in: we're simplifying discovery and making important discussions happen. With over 19,000 sources, including peer-reviewed journals, preprints, blogs, universities, podcasts and Live events across 10 research areas, you'll never miss what's important to you. It's like social media, but better. Oh, and we should mention - it's free.

  • Download from Google Play
  • Download from App Store
  • Download from AppInChina

Researcher displays publicly available abstracts and doesn’t host any full article content. If the content is open access, we will direct clicks from the abstracts to the publisher website and display the PDF copy on our platform. Clicks to view the full text will be directed to the publisher website, where only users with subscriptions or access through their institution are able to view the full article.