Constraints on Weak Supernova Kicks from Observed Pulsar Velocities

Willcox, Reinhold; Mandel, Ilya; Thrane, Eric; Deller, Adam; Stevenson, Simon; Vigna-Gómez, Alejandro

doi:10.48550/arxiv.2107.04251

Cited by 3 publications

(7 citation statements)

References 37 publications

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“…We assume that such stars undergo an ecSN, receiving weak natal kicks drawn from the Maxwellian velocity distribution with 𝜎 = 30 km/s. In these three models we assume that ecSN occurs exclusively in stars which lost their hydrogen envelope due to mass transfer in line with original idea by Podsiadlowski et al (2004), and more recently used by Willcox et al (2021). In our models G1, H1 and J1 we also check if effectively isolated stars have helium core mass at the beginning of AGB in ranges as mentioned in Table 2.…”

Section: Assumptions For the Binary Population Synthesismentioning

confidence: 96%

“…In comparison to Willcox et al (2021), we do require ecSN to occur in effectively isolated stars. The main reason for this is that Willcox et al ( 2021) used a non-parametric description for natal kick of NSs.…”

Section: Electron Capture Supernova Explosionsmentioning

confidence: 99%

“…While we were preparing this article, Willcox et al (2021) published a study on a similar topic. The author used a non-parametric description for the natal kicks of core-collapse NSs.…”

Section: Introductionmentioning

confidence: 99%

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Combined analysis of neutron star natal kicks using proper motions and parallax measurements for radio pulsars and Be X-ray binaries

Igoshev,

Chruslinska,

Dorozsmai

et al. 2021

Preprint

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Supernova explosion and the associated neutron star natal kicks are important events on a pathway of a binary to become a gravitational wave source, an X-ray binary or a millisecond radio pulsar. Weak natal kicks often lead to binary survival, while strong kicks frequently disrupt the binary. In this article, we aim to further constrain neutron star natal kicks in binaries. We explore binary population synthesis models by varying prescription for natal kick, remnant mass and mass accretion efficiency. We introduce a robust statistical technique to analyse combined observations of different nature. Using this technique, we further test different models using parallax and proper motion measurements for young isolated radio pulsars and similar measurements for Galactic Be X-ray binaries. Our best model for natal kicks is consistent with both measurements and contains a fraction of 𝑤 = 0.2 ± 0.1 weak natal kicks with 𝜎 1 = 45 +25 −15 km/s, the remaining natal kicks are drawn from the high-velocity component, same as in previous works: 𝜎 2 = 336 km/s. We found that currently used models for natal kicks of neutron stars produced by electron capture supernova (combination of maxwellian 𝜎 = 265 km/s and 𝜎 = 30 km/s for electron capture) are inconsistent or marginally consistent with parallaxes and proper motions measured for isolated radio pulsars. We suggest a new model for natal kicks of ecSN, which satisfy both observations of isolated radio pulsars and Be X-ray binaries.

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Section: Assumptions For the Binary Population Synthesismentioning

confidence: 96%

Section: Electron Capture Supernova Explosionsmentioning

confidence: 99%

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Combined analysis of neutron star natal kicks using proper motions and parallax measurements for radio pulsars and Be X-ray binaries

Igoshev,

Chruslinska,

Dorozsmai

et al. 2021

Preprint

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“…Andrews et al (2015) and Vinciguerra et al (2020) use different core mass ranges for ECSNe (2-2.5 M and 1.83-2.25 M , respectively, where the latter is based on Fryer et al 2012, which could better reproduce observations of NSs). Willcox et al (2021) argued that the (ZAMS) mass range of (effectively) single stars undergoing ECSNe cannot be wider than 0.2 M to avoid overproducing low velocity pulsars, but ECSNe could be more common in binaries.…”

Section: Electron-capture Supernovaementioning

confidence: 99%

“…Miller-Jones et al (2021) and Neijssel et al (2021) constrained the massive star wind mass loss with observations of the black hole (BH) high-mass X-ray binary Cygnus X-1. Willcox et al (2021) compared COM-PAS models against observed pulsar velocities in order to study neutron star natal kicks.…”

mentioning

confidence: 99%

Rapid stellar and binary population synthesis with COMPAS

COMPAS,

Riley,

Agrawal

et al. 2021

Preprint

Self Cite

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VFTS 243 as predicted by the BPASS fiducial models

Stevance¹,

Ghodla²,

Richards³

et al. 2022

Preprint

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The recent discovery of an unambiguous quiescent BH and main sequence O star companion in VFTS 243 opens the door to new constraints on theoretical stellar evolution and population models looking to reproduce the progenitors of black hole -black hole binaries. Here we show that the Binary Population and Spectral Synthesis fiducial models (BPASSv2.2.1) natively predict VFTS 243-like systems: We find that VFTS 243 likely originated from a binary system in a ∼15 day orbit with primary mass ranging from 40 to 50 M and secondary star with initial mass 24-25 M . Additionally we find that the death of the primary star must have resulted in a low energy explosion 𝐸 < 10 50 ergs. With a uniform prior we find that the kick velocity of the new-born black hole was < 33 km s −1 (90 percent credible interval). The very low eccentricity reported for VFTS 243 and the subsequent conclusion by the authors that the SN kick must have been very small is in line with the peak in the posterior distribution between 0 and 5 km s −1 . Finally, the reduced Hobbs kick distribution commonly used in black hole population synthesis is strongly disfavoured, whereas the Bray kick with the most recent parameter calibration predicts 2 ± 3.5 km s −1 , which is very consistent with the posterior velocity distributions obtained for our matching VFTS 243-like models using a uniform kick prior.

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Constraints on Weak Supernova Kicks from Observed Pulsar Velocities

Cited by 3 publications

References 37 publications

Combined analysis of neutron star natal kicks using proper motions and parallax measurements for radio pulsars and Be X-ray binaries

Combined analysis of neutron star natal kicks using proper motions and parallax measurements for radio pulsars and Be X-ray binaries

Rapid stellar and binary population synthesis with COMPAS

VFTS 243 as predicted by the BPASS fiducial models

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