PSR J1755$-$2550: A young radio pulsar with a massive, compact companion
C. Ng, M. U. Kruckow, T. M. Tauris, A. G. Lyne, P. C. C. Freire, A., Ridolfi, I. Caiazzo, J. Heyl, M. Kramer, A. D. Cameron, D. J. Champion, B., Stappers

TL;DR
This paper reports on the discovery and analysis of PSR J1755-2550, a young, non-recycled radio pulsar in a binary system, with uncertain companion type, and discusses its implications for binary evolution and supernovae.
Contribution
It provides detailed timing analysis of PSR J1755-2550 and explores the nature of its companion using population synthesis and observational searches, highlighting its rarity.
Findings
PSR J1755-2550 is a young, non-recycled pulsar with a 315 ms spin period.
The companion is likely either a massive white dwarf or a neutron star, with both options being equally probable.
Population synthesis predicts a minimum companion mass of 0.90 M_sun and potential for merging systems that could produce Ca-rich supernovae.
Abstract
Radio pulsars found in binary systems with short orbital periods are usually fast spinning as a consequence of recycling via mass transfer from their companion stars; this process is also thought to decrease the magnetic field of the neutron star being recycled. Here, we report on timing observations of the recently discovered binary PSR J17552550 and find that this pulsar is an exception: with a characteristic age of 2.1 Myr, it is relatively young; furthermore, with a spin period of 315 ms and a surface magnetic field strength at its poles of 0.8810 G the pulsar shows no sign of having been recycled. Based on its timing and orbital characteristics, the pulsar either has a massive white dwarf (WD) or a neutron star (NS) companion. To distinguish between these two cases, we searched radio observations for a potential recycled pulsar companion and analysed archival…
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