The black widow pulsar J1641+8049 in the optical, radio and X-rays

Abstract

PSR J1641+8049 is a 2 ms black widow pulsar with the 2.2 h orbital period detected in the radio and $\gamma$-rays. We performed new phase-resolved multi-band photometry of PSR J1641+8049 using the OSIRIS instrument at the Gran Telescopio Canarias. The obtained data were analysed together with the new radio-timing observations from the Canadian Hydrogen Intensity Mapping Experiment (CHIME), the X-ray data from the Spectrum-RG/eROSITA all-sky survey, and all available optical photometric observations. An updated timing solution based on CHIME data is presented, which accounts for secular and periodic modulations in pulse dispersion. The system parameters obtained through the light curve analysis, including the distance to the source 4.6-4.8 kpc and the orbital inclination 56-59 deg, are found to be consistent with previous studies. However, the optical flux of the source at the maximum brightness phase faded by a factor of $\sim$2 as compared to previous observations. Nevertheless, the face of the J1641+8049 companion remains one of the most heated (8000-9500 K) by a pulsar among the known black widow pulsars. We also report a new estimation on the pulsar proper motion of $\approx$2 mas yr${}^{-1}$, which yields a spin down luminosity of $\approx$4.87$\times 10^{34}$ ergs s${}^{-1}$ and a corresponding heating efficiency of the companion by the pulsar of 0.3-0.7. The pulsar was not detected in X-rays implying its X-ray-luminosity was <3 $\times$ 10${}^{31}$ erg s${}^{-1}$ at the date of observations.

Accepted for publication in MNRAS

References in corpus (22)

• Gaia Data Release 3: Summary of the content and survey properties
• A New Electron Density Model for Estimation of Pulsar and FRB Distances
• The eROSITA X-ray telescope on SRG
• Incremental Fermi Large Area Telescope Fourth Source Catalog
• The SRG X-ray orbital observatory, its telescopes and first scientific results
• The observed velocity distribution of young pulsars
• The Green Bank Northern Celestial Cap Pulsar Survey - I: Survey Description, Data Analysis, and Initial Results
• PSR J1810+1744: Companion Darkening and a Precise High Neutron Star Mass
• The CHIME Pulsar Project: System Overview
• A Spectroscopic Study of the Extreme Black Widow PSR J1311-3430
• 21-year timing of the black-widow pulsar J2051-0827
• Millisecond Pulsars, their Evolution and Applications
• A New Flaring Black Widow Candidate and Demographics of Black Widow Millisecond Pulsars in the Galactic Field
• An Optical Study of the Black Widow Population
• Measuring the mass of the black widow PSR J1555-2908
• A black widow population dissection through HiPERCAM multi-band light curve modelling
• Black widow formation by pulsar irradiation and sustained magnetic braking
• Face changing companion of the redback millisecond pulsar PSR J1048+2339
• A 62-minute orbital period black widow binary in a wide hierarchical triple
• Formation of black widows through ultra-compact X-ray binaries with He star companions
• Irradiated but not eclipsed, the case of PSR J0610-2100
• Optical Light Curve of 4FGL J0935.3+0901: A Flaring Black Widow Candidate

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