GW170817 and GW190814: Tension on the Maximum Mass
Abstract
The detection of the binary events GW170817 and GW190814 has provided invaluable constraints on the maximum mass of nonrotating configurations of neutron stars, M_(TOV). However, the large differences in the neutron-star masses measured in GW170817 and GW190814 has also lead to significant tension between the predictions for such maximum masses, with GW170817 suggesting that M_(TOV) ≲ 2.3 M_⊙, and GW190814 requiring M_(TOV) ≳ 2.5 M_⊙ if the secondary was a (non- or slowly rotating) neutron star at merger. Using a genetic algorithm, we sample the multidimensional space of parameters spanned by gravitational-wave and astronomical observations associated with GW170817. Consistent with previous estimates, we find that all of the physical quantities are in agreement with the observations if the maximum mass is in the range of M_(TOV)_(-0.123)^(0.116) M_⊙ within a 2σ confidence level. By contrast, maximum masses with M_(TOV) ≳ 2.5 M_⊙, not only require efficiencies in the gravitational-wave emission that are well above the numerical-relativity estimates, but they also lead to a significant underproduction of the ejected mass. Hence, the tension can be released by assuming that the secondary in GW190814 was a black hole at merger, although it could have been a rotating neutron star before.
Additional Information
© 2021. The American Astronomical Society. It is a pleasure to thank C. Ecker, J. Papenfort, and L. Weih for useful comments. Support comes in part also from "PHAROS," COST Action CA16214, and the LOEWE-Program in HIC for FAIR. E.R.M. gratefully acknowledges support from a joint fellowship at the Princeton Center for Theoretical Science, the Princeton Gravity Initiative, and the Institute for Advanced Study. Software: Scipy (Virtanen et al. 2020), Corner (Foreman-Mackey 2016), Matplotlib (Hunter 2007).Attached Files
Published - Nathanail_2021_ApJL_908_L28.pdf
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Additional details
- Eprint ID
- 121223
- Resolver ID
- CaltechAUTHORS:20230501-297335000.43
- CA16214
- European Cooperation in Science and Technology (COST)
- Helmholtz International Center for FAIR
- Princeton University
- Institute for Advanced Study
- Created
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2023-05-04Created from EPrint's datestamp field
- Updated
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2023-05-04Created from EPrint's last_modified field