The impact of stellar rotation on the black hole mass-gap from pair-instability supernovae

Abstract

Models of pair-instability supernovae (PISNe) predict a gap in black hole (BH) masses between $\sim 45M_{\odot }-120M_{\odot }$, which is referred to as the upper BH mass-gap. With the advent of gravitational-wave astrophysics it has become possible to test this prediction, and there is an important associated effort to understand what theoretical uncertainties modify the boundaries of this gap. In this work we study the impact of rotation on the hydrodynamics of PISNe, which leave no compact remnant, as well as the evolution of pulsational-PISNe (PPISNe), which undergo thermonuclear eruptions before forming a compact object. We perform simulations of non-rotating and rapidly-rotating stripped helium stars in a metal poor environment $(Z_{\odot }/50)$ in order to resolve the lower edge of the upper mass-gap. We find that the outcome of our simulations is dependent on the efficiency of angular momentum transport, with models that include efficient coupling through the Spruit-Tayler dynamo shifting the lower edge of the mass-gap upwards by $\sim 4\%$, while simulations that do not include this effect shift it upwards by $\sim 15\%$. From this, we expect the lower edge of the upper mass-gap to be dependent on BH spin, which can be tested as the number of observed BH mergers increases. Moreover, we show that stars undergoing PPISNe have extended envelopes ($R\sim 10-1000R_{\odot }$) at iron-core collapse, making them promising progenitors for ultra-long gamma-ray bursts.

9 pages, including 4 pages of appendices

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