Discovery, Timing, and Multiwavelength Observations of the Black Widow Millisecond Pulsar PSR J1555–2908

Ray, Paul S.; Nieder, Lars; Clark, Colin J.; Ransom, Scott M.; Cromartie, H. Thankful; Frail, Dale A.; Mooley, Kunal P.; Intema, Huib; Jagannathan, Preshanth; Demorest, Paul; Stovall, Kevin; Halpern, Jules P.; Deneva, Julia; Guillot, Sebastien; Kerr, Matthew; Swihart, Samuel J.; Bruel, Philippe; Stappers, Ben W.; Lyne, Andrew; Mickaliger, Mitch; Camilo, Fernando; Ferrara, Elizabeth C.; Wolff, Michael T.; Michelson, P. F.

doi:10.3847/1538-4357/ac49ef

Discovery, Timing, and Multiwavelength Observations of the Black Widow Millisecond Pulsar PSR J1555–2908

Journal Article · Thu Mar 17 00:00:00 EDT 2022 · The Astrophysical Journal

DOI:https://doi.org/10.3847/1538-4357/ac49ef· OSTI ID:1855504

; ; ; ; ; Frail, Dale A.; ; ; ; ; ; ; ; ; ; ; ; Stappers, Ben W.; ; more »

Abstract

We report the discovery of PSR J1555−2908, a 1.79 ms radio and gamma-ray pulsar in a 5.6 hr binary system with a minimum companion mass of 0.052 M _⊙ . This fast and energetic ( $\dot{E} = 3 \times 10^{35}$ erg s ⁻¹ ) millisecond pulsar was first detected as a gamma-ray point source in Fermi Large Area Telescope (LAT) sky survey observations. Guided by a steep-spectrum radio point source in the Fermi error region, we performed a search at 820 MHz with the Green Bank Telescope that first discovered the pulsations. The initial radio pulse timing observations provided enough information to seed a search for gamma-ray pulsations in the LAT data, from which we derive a timing solution valid for the full Fermi mission. In addition to the discovery and timing of radio and gamma-ray pulsations, we searched for X-ray pulsations using NICER but no significant pulsations were detected. We also obtained time-series r -band photometry that indicates strong heating of the companion star by the pulsar wind. Material blown off the heated companion eclipses the 820 MHz radio pulse during inferior conjunction of the companion for ≈10% of the orbit, which is twice the angle subtended by its Roche lobe in an edge-on system.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE

OSTI ID:: 1855504

Alternate ID(s):: OSTI ID: 1867004

Journal Information:: The Astrophysical Journal, Journal Name: The Astrophysical Journal Journal Issue: 2 Vol. 927; ISSN 0004-637X

Publisher:: American Astronomical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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