Article,
Constraints on Neutrino Natal Kicks from Black-Hole Binary VFTS 243
Contributors
Vigna-Gómez, Alejandro
0000-0003-1817-3586
[1]
[2]
Willcox, Reinhold
0000-0003-0674-9453
[3]
[4]
[5]
Tamborra, Irene
0000-0001-7449-104X
[1]
Mandel, Ilya
0000-0002-6134-8946
[4]
[5]
Renzo, Mathieu
0000-0002-6718-9472
[6]
[7]
Wagg, Tom
0000-0001-6147-5761
[8]
Janka, Hans-Thomas
0000-0002-0831-3330
[2]
Kresse, Daniel
0000-0003-1120-2559
[2]
[9]
Bodensteiner, Julia
0000-0002-9552-7010
[10]
Shenar, Tomer
0000-0003-0642-8107
[11]
Tauris, Thomas M
0000-0002-3865-7265
[12]
Affiliations
- [1] University of Copenhagen [NORA names: KU University of Copenhagen; University; Denmark; Europe, EU; Nordic; OECD];
- [2] Max Planck Institute for Astrophysics [NORA names: Germany; Europe, EU; OECD];
- [3] KU Leuven [NORA names: Belgium; Europe, EU; OECD];
- [4] Monash University [NORA names: Australia; Oceania; OECD];
- [5] The ARC Centre of Excellence for Gravitational Wave Discovery—OzGrav, Australia [NORA names: Miscellaneous; Australia; Oceania; OECD];
(... more)
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 (≈10M_{⊙}) and near-circular orbit (e≈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% confidence level, the natal kick velocity (mass decrement) is ≲10 km/s (≲1.0M_{⊙}), with a full probability distribution that peaks when ≈0.3M_{⊙} were ejected, presumably in neutrinos, and the black hole experienced a natal kick of 4 km/s. The neutrino-emission asymmetry is ≲4%, with best fit values of ∼0-0.2%. Such a small neutrino natal kick accompanying black-hole formation is in agreement with theoretical predictions.
