TY - JOUR

T1 - Mass estimates from optical modelling of the new TRAPUM redback PSR J1910−5320

AU - Dodge, O. G.

AU - Breton, R. P.

AU - Clark, C. J.

AU - Burgay, M.

AU - Strader, J.

AU - Au, K. Y.

AU - Barr, E. D.

AU - Buchner, S.

AU - Dhillon, V. S.

AU - Ferrara, E. C.

AU - Freire, P. C.C.

AU - Griessmeier, J. M.

AU - Kennedy, M. R.

AU - Kramer, M.

AU - Li, K. L.

AU - Padmanabh, P. V.

AU - Phosrisom, A.

AU - Stappers, B. W.

AU - Swihart, S. J.

AU - Thongmeearkom, T.

N1 - Funding Information: The MeerKAT telescope is operated by the South African Radio Astronomy Observatory, which is a facility of the National Research Foundation, an agency of the Department of Science and Innovation. We thank the staff at SARAO for their help with observations and commissioning. TRAPUM observations used the FBFUSE and APSUSE computing clusters for data acquisition, storage, and analysis. These clusters were funded, designed, and installed by the Max-Planck-Institut-für-Radioastronomie (MPIfR) and the Max-Planck-Gesellschaft. FBFUSE performs beamforming operations in real-time using the mosaic software stack (Chen et al. ). Observations used the Pulsar Timing User Supplied Equipment (PTUSE) servers at MeerKAT which were funded by the MeerTime Collaboration members ASTRON, AUT, CSIRO, ICRAR-Curtin, MPIfR, INAF, NRAO, Swinburne University of Technology, the University of Oxford, UBC, and the University of Manchester. The system design and integration was led by Swinburne University of Technology and Auckland University of Technology in collaboration with SARAO and supported by the ARC Centre of Excellence for Gravitational Wave Discovery (OzGrav) under grant CE170100004.

PY - 2024/3

Y1 - 2024/3

N2 - Spider pulsars continue to provide promising candidates for neutron star mass measurements. Here we present the discovery of PSR J1910−5320, a new millisecond pulsar discovered in a MeerKAT observation of an unidentified Fermi-LAT gamma-ray source. This pulsar is coincident with a recently identified candidate redback binary, independently discovered through its periodic optical flux and radial velocity. New multicolour optical light curves obtained with ULTRACAM/New Technology Telescope in combination with MeerKAT timing and updated SOAR/Goodman spectroscopic radial velocity measurements allow a mass constraint for PSR J1910−5320. ICARUS optical light curve modelling, with streamlined radial velocity fitting, constrains the orbital inclination and companion velocity, unlocking the binary mass function given the precise radio ephemeris. Our modelling aims to unite the photometric and spectroscopic measurements available by fitting each simultaneously to the same underlying physical model, ensuring self-consistency. This targets centre-of-light radial velocity corrections necessitated by the irradiation endemic to spider systems. Depending on the gravity darkening prescription used, we find a moderate neutron star mass of either 1.6 ± 0.2 or 1.4 ± 0.2 M. The companion mass of either 0.45 ± 0.04 or 0.43+−000304 M also further confirms PSR J1910−5320 as an irradiated redback spider pulsar.

AB - Spider pulsars continue to provide promising candidates for neutron star mass measurements. Here we present the discovery of PSR J1910−5320, a new millisecond pulsar discovered in a MeerKAT observation of an unidentified Fermi-LAT gamma-ray source. This pulsar is coincident with a recently identified candidate redback binary, independently discovered through its periodic optical flux and radial velocity. New multicolour optical light curves obtained with ULTRACAM/New Technology Telescope in combination with MeerKAT timing and updated SOAR/Goodman spectroscopic radial velocity measurements allow a mass constraint for PSR J1910−5320. ICARUS optical light curve modelling, with streamlined radial velocity fitting, constrains the orbital inclination and companion velocity, unlocking the binary mass function given the precise radio ephemeris. Our modelling aims to unite the photometric and spectroscopic measurements available by fitting each simultaneously to the same underlying physical model, ensuring self-consistency. This targets centre-of-light radial velocity corrections necessitated by the irradiation endemic to spider systems. Depending on the gravity darkening prescription used, we find a moderate neutron star mass of either 1.6 ± 0.2 or 1.4 ± 0.2 M. The companion mass of either 0.45 ± 0.04 or 0.43+−000304 M also further confirms PSR J1910−5320 as an irradiated redback spider pulsar.

KW - pulsars: general

KW - pulsars: individual: J1910−5320

KW - techniques: photometric

KW - techniques: radial velocities

UR - http://www.scopus.com/inward/record.url?scp=85184828219&partnerID=8YFLogxK

U2 - 10.48550/arXiv.2401.09928

DO - 10.48550/arXiv.2401.09928

M3 - Article

AN - SCOPUS:85184828219

VL - 528

SP - 4337

EP - 4353

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

IS - 3

ER -