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A Young White Dwarf Orbiting PSR J1835−3259B in the Bulge Globular Cluster NGC 6652

Authors :
Jianxing Chen
Mario Cadelano
Cristina Pallanca
Francesco R. Ferraro
Barbara Lanzoni
Alina G. Istrate
Marta Burgay
Paulo C. C. Freire
Tasha Gautam
Andrea Possenti
Alessandro Ridolfi
Source :
The Astrophysical Journal, Vol 948, Iss 2, p 84 (2023)
Publication Year :
2023
Publisher :
IOP Publishing, 2023.

Abstract

We report on the discovery of the companion star to the millisecond pulsar PSR J1835−3259B in the Galactic globular cluster NGC 6652. Taking advantage of deep photometric archival observations acquired through the Hubble Space Telescope in near-UV and optical bands, we identified a bright and blue object at a position compatible with that of the radio pulsar. The companion is located along the helium-core white dwarf cooling sequence, and the comparison with binary evolution models provides a mass of 0.17 ± 0.02 M _⊙ , a surface temperature of 11,500 ± 1900 K, and a very young cooling age of only 200 ± 100 Myr. The mass and the age of the companion are compatible with a progenitor star of about 0.87 M _⊙ , which started transferring mass to the primary during its evolution along the subgiant branch and stopped during the early red giant branch phase. Combining together the pulsar mass function and the companion mass, we found that this system is observed at an almost edge-on orbit and hosts a neutron star with a mass of 1.44 ± 0.06 M _⊙ , thus suggesting a highly nonconservative mass accretion phase. The young age of the WD companion is consistent with the scenario of a powerful, relatively young MSP indicated by the earlier detection of gamma-rays from this system.

Details

Language :
English
ISSN :
15384357
Volume :
948
Issue :
2
Database :
Directory of Open Access Journals
Journal :
The Astrophysical Journal
Publication Type :
Academic Journal
Accession number :
edsdoj.56f32c49008f4b7f83ea56f954e2ae82
Document Type :
article
Full Text :
https://doi.org/10.3847/1538-4357/acc583