Article open access publication

Black Hole Formation in Fallback Supernova and the Spins of LIGO Sources

The Astrophysical Journal Letters, American Astronomical Society, ISSN 2041-8205

Volume 862, 1, 2018

DOI:10.3847/2041-8213/aacf8d, Dimensions: pub.1105637304,



  1. (1) University of California, Santa Cruz, grid.205975.c
  2. (2) University of Copenhagen, grid.5254.6, KU


Here we investigate within the context of field binary progenitors how the the spin of the Laser Interferometer Gravitational Wave Observatory (LIGO) sources vary when the helium star-descendant black hole (BH) is formed in a failed supernova (SN) explosion rather than by direct collapse. To this end, we make use of 3d hydrodynamical simulations of fallback supernova in close binary systems with properties designed to emulate LIGO sources. By systematically varying the explosion energy and the binary properties, we are able to explore the effects that the companion has on redistributing the angular momentum of the system. We find that, unlike the mass, the spin of the newly formed BH varies only slightly with the currently theoretically unconstrained energy of the SN and is primarily determined by the initial binary separation. In contrast, variations in the initial binary separation yield sizable changes on the resultant effective spin of the system. This implies that the formation pathways of LIGO sources leading to a particular effective spin might be far less restrictive than the standard direct collapse scenario suggests.

Research Categories

Main Subject Area

Fields of Research

Links & Metrics

NORA University Profiles

University of Copenhagen

Dimensions Citation Indicators

Times Cited: 18

Field Citation Ratio (FCR): 9.3

Open Access Info