Optical spectral observations of three binary millisecond pulsars

Abstract

We present the results of optical spectroscopy of stellar companions to three binary millisecond pulsars, PSRs J0621$+$2514, J2317$+$1439 and J2302$+$4442, obtained with the Gran Telescopio Canarias. The spectrum of the J0621$+$2514 companion shows a blue continuum and prominent Balmer absorption lines. The latter are also resolved in the spectrum of the J2317$+$1439 companion, showing that both are DA-type white dwarfs. No spectral features are detected for the J2302$+$4442 companion, however, its broadband magnitudes and the spectral shape of the continuum emission imply that this is also a DA-type white dwarf. Based on the spectral analyses, we conclude that the companions of J0621$+$2514 and J2317$+$1439 are relatively hot, with effective temperatures $T_{\mathrm{eff}}$$=$8600$\pm$200 and 9600$\pm$2000~K, respectively, while the J2302$+$4442 companion is significantly cooler, $T_{\mathrm{eff}}$$<$6000~K. We also estimated the distance to J0621$+$2514 of 1.1$\pm$0.3 kpc and argue that its companion and the companion of J2317$+$1439 are He-core white dwarfs providing constraints on their cooling ages of $\lesssim$2 Gyr.

arXiv comment9 pages, 8 figures. Paper accepted to MNRAS

References in corpus (27)

• A Massive Pulsar in a Compact Relativistic Binary
• The ATNF Pulsar Catalogue
• A statistical study of 233 pulsar proper motions
• A 3D Dust Map Based on Gaia, Pan-STARRS 1 and 2MASS
• A New Electron Density Model for Estimation of Pulsar and FRB Distances
• Refined Mass and Geometric Measurements of the High-Mass PSR J0740+6620
• The Nuclear Equation of State and Neutron Star Masses
• The Pan-STARRS1 Database and Data Products
• The NANOGrav 11-year Data Set: High-precision timing of 45 Millisecond Pulsars
• Incremental Fermi Large Area Telescope Fourth Source Catalog
• NE2001.I. A New Model for the Galactic Distribution of Free Electrons and its Fluctuations
• An Improved Spectroscopic Analysis of DA White Dwarfs from the Sloan Digital Sky Survey Data Release 4
• On the nature and evolution of the unique binary pulsar J1903+0327
• An Analysis of the Shapes of Interstellar Extinction Curves. VII. Milky Way Spectrophotometric Optical-through-Ultraviolet Extinction and Its R-Dependence
• Found: The missing blue opacity in atmosphere models of cool hydrogen white dwarfs
• New evolutionary sequences for extremely low mass white dwarfs: Homogeneous mass and age determinations, and asteroseismic prospects
• The relativistic pulsar-white dwarf binary PSR J1738+0333 I. Mass determination and evolutionary history
• Radio Searches of Fermi LAT Sources and Blind Search Pulsars: The Fermi Pulsar Search Consortium
• Discovery of two millisecond pulsars in Fermi sources with the Nancay Radio Telescope
• General Relativistic effects in the structure of massive white dwarfs
• PSR J1012+5307: a millisecond pulsar with an extremely low-mass white dwarf companion
• Formation of millisecond pulsars. I. Evolution of low-mass X-ray binaries with P > 2 days
• Wolf-Rayet stars in M81: Detection and Characterization using GTC/OSIRIS spectra and HST/ACS images
• Searches for Shapiro delay in seven binary pulsars using the MeerKAT telescope
• Identification of the white dwarf companion to millisecond pulsar J2317+1439
• Optical identification of the binary companion to the millisecond PSR J2302+4442 with the Gran Telescopio Canarias
• Optical identification of the millisecond pulsar J0621+2514