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  Measuring the mass of the black widow PSR J1555-2908

Kennedy, M. R., Breton, R. P., Clark, C. J., Mata-Sanchez, D., Voisin, G., Dhillon, V. S., et al. (2022). Measuring the mass of the black widow PSR J1555-2908. Monthly Notices of the Royal Astronomical Society, stac379. doi:10.1093/mnras/stac379.

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Kennedy, M. R., Author
Breton, R. P., Author
Clark, C. J.1, Author              
Mata-Sanchez, D., Author
Voisin, G., Author
Dhillon, V. S., Author
Halpern, J. P., Author
Marsh, T. R., Author
Nieder, L.1, Author              
Ray, P. S., Author
van Kerkwijk, M. H., Author
Affiliations:
1Observational Relativity and Cosmology, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, ou_24011              

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Free keywords: Astrophysics, High Energy Astrophysical Phenomena, astro-ph.HE, Astrophysics, Solar and Stellar Astrophysics, astro-ph.SR
 Abstract: Accurate measurements of the masses of neutron stars are necessary to test binary evolution models, and to constrain the neutron star equation of state. In pulsar binaries with no measurable post-Keplerian parameters, this requires an accurate estimate of the binary system's inclination and the radial velocity of the companion star by other means than pulsar timing. In this paper, we present the results of a new method for measuring this radial velocity using the binary synthesis code Icarus. This method relies on constructing a model spectrum of a tidally distorted, irradiated star as viewed for a given binary configuration. This method is applied to optical spectra of the newly discovered black widow PSR J1555-2908. By modelling the optical spectroscopy alongside optical photometry, we find that the radial velocity of the companion star is $397\pm4$ km s$^{-1}$ (errors quoted at 95\% confidence interval), as well as a binary inclination of $>75^{\rm o}$. Combined with $\gamma$-ray pulsation timing information, this gives a neutron star mass of 1.67$^{+0.15}_{-0.09}$ M$_\odot$ and a companion mass of 0.060$^{+0.005}_{-0.003}$ M$_\odot$, placing PSR J1555-2908 at the observed upper limit of what is considered a black widow system.

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 Dates: 2022-02-092022
 Publication Status: Published online
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 Identifiers: arXiv: 2202.05111
DOI: 10.1093/mnras/stac379
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Title: Monthly Notices of the Royal Astronomical Society
Source Genre: Journal
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Pages: - Volume / Issue: - Sequence Number: stac379 Start / End Page: - Identifier: -