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arXiv · 2310.01509

Constraints on neutrino natal kicks from black-hole binary VFTS 243

Alejandro Vigna-Gómez·Reinhold Willcox·Irene Tamborra·Ilya Mandel·Mathieu Renzo·Tom Wagg·Hans-Thomas Janka·Daniel Kresse·Julia Bodensteiner·Tomer Shenar·Thomas M. Tauris
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Abstract

The recently reported observation of VFTS 243 is the first example of a massive black-hole binary system with negligible binary interaction following black-hole formation. The black-hole mass ($\approx 10\ M_{\odot}$) and near-circular orbit ($e\approx 0.02$) of VFTS 243 suggest that the progenitor star experienced complete collapse, with energy-momentum being lost predominantly through neutrinos. VFTS 243 enables us to constrain the natal kick and neutrino-emission asymmetry during black-hole formation. At 68% C.L., the natal kick velocity (mass decrement) is $\lesssim 10$ km/s ($\lesssim 1.0\ M_{\odot}$), with a full probability distribution that peaks when $\approx 0.3\ M_{\odot}$ were ejected, presumably in neutrinos, and the black hole experienced a natal kick of $4$ km/s. The neutrino-emission asymmetry is $\lesssim 4$%, with best fit values of $\sim$0-0.2%. Such a small neutrino natal kick accompanying black-hole formation is in agreement with theoretical predictions.

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Alejandro Vigna-Gómez, Reinhold Willcox, Irene Tamborra, Ilya Mandel, Mathieu Renzo, Tom Wagg, Hans-Thomas Janka, Daniel Kresse, Julia Bodensteiner, Tomer Shenar, Thomas M. Tauris. 2023-10-02. Constraints on neutrino natal kicks from black-hole binary VFTS 243. https://arxiv.org/abs/2310.01509

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