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ULTRACAM Observations of PSR J2039-5617
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(2021) ULTRACAM Observations of PSR J2039-5617. [Dataset]
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Official URL: http://doi.org/10.5281/zenodo.3964204
Abstract
The Fermi Large Area Telescope gamma-ray source 3FGL J2039.6–5618 contains a periodic optical and X-ray source that was predicted to be a ‘redback’ millisecond pulsar (MSP) binary system. However, the conclusive identification required the detection of pulsations from the putative MSP. To better constrain the orbital parameters for a directed search for gamma-ray pulsations, we obtained new optical light curves in 2017 and 2018, which revealed long-term variability from the companion star. The resulting orbital parameter constraints were used to perform a targeted gamma-ray pulsation search using the Einstein@Home-distributed volunteer computing system. This search discovered pulsations with a period of 2.65 ms, confirming the source as a binary MSP now known as PSR J2039–5617. Optical light-curve modelling is complicated, and likely biased, by asymmetric heating on the companion star and long-term variability, but we find an inclination i ≳ 60°, for a low pulsar mass between 1.1M⊙<Mpsr< 1.6 M⊙, and a companion mass of 0.15–0.22M⊙, confirming the redback classification. Timing the gamma-ray pulsations also revealed significant variability in the orbital period, which we find to be consistent with quadrupole moment variations in the companion star, suggestive of convective activity. We also find that the pulsed flux is modulated at the orbital period, potentially due to inverse Compton scattering between high-energy leptons in the pulsar wind and the companion star’s optical photon field.
| Item Type: | Dataset | ||||||||||||||||||
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| Alternative Title: | Data for Einstein@Home discovery of the gamma-ray millisecond pulsar PSR J2039–5617 confirms its predicted redback nature | ||||||||||||||||||
| Subjects: | Q Science > QB Astronomy Q Science > QC Physics |
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| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||||||||||||
| Type of Data: | Observational data | ||||||||||||||||||
| Library of Congress Subject Headings (LCSH): | Neutron stars, Pulsars, Gamma rays, Double stars | ||||||||||||||||||
| Publisher: | University of Warwick, Department of Physics | ||||||||||||||||||
| Official Date: | 10 March 2021 | ||||||||||||||||||
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| Status: | Not Peer Reviewed | ||||||||||||||||||
| Publication Status: | Published | ||||||||||||||||||
| Media of Output (format): | .dat .par .gz | ||||||||||||||||||
| Access rights to Published version: | Open Access (Creative Commons) | ||||||||||||||||||
| Copyright Holders: | University of Warwick | ||||||||||||||||||
| Description: | Data record consists of 16 raw data files in dat, par and gz format. |
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