{
  "bibcode": "2019GCN.24420....1R",
  "body": "LIGO/Virgo S190426c (BHNS candidate): Implications from Numerical Relativity\n\nM. Ruiz, S. L. Shapiro and A. Tsokaros\nreport on behalf of the Illinois Relativity Group\n\n\nConsistent with GCN 24411, indicating that the LIGO/Virgo gravitational\nwave source S190426c is a likely BHNS, the absence of a gamma-ray burst,\nkilonova and other counterpart EM radiation agrees with recent GRMHD\nsimulations of BHNS mergers by our Illinois Relativity Group. In\nRuiz, Shapiro and Tsokaros (2018), PRD 98, 123017 (arXiv 1810.08618), the\ngroup surveyed BHNS configurations with different initial mass ratios\nq=BH:NS=3:1 and 5:1, BH spins a_{BH}/M_{BH}=-0.5, 0, 0.5, 0.75 and dipole\nmagnetic fields (aligned and tilted by 90 degrees with respect to the\norbital angular momentum). Only for initial a_{BH}/M_{BH}>=0.5 and\naligned B-fields did we find collimated, magnetically-confined jets\nlaunched from the poles of the BH remnants following the peak GW signal.\nOnly in those cases did we find EM luminosities consistent with typical\nsGRBs and significant mass outflows. For example, in our case q=5:1 and\na_{BH}/M_{BH}=0 the remnant disk and magnetic field were too small to\ndrive a jet and generate a significant mass outflow or counterpart EM\nluminosity, hence no sGRB or kilonova.",
  "circularId": 24420,
  "createdOn": 1557254377000,
  "email": "tsokaros@illinois.edu",
  "subject": "LIGO/Virgo S190426c (BHNS candidate): Implications from Numerical Relativity",
  "submitter": "Antonios Tsokaros at U of Illinois,Urbana-Champaign  <tsokaros@illinois.edu>",
  "eventId": "LIGO/Virgo S190426c"
}