A Caltech Library Service

PSR J2322−2650 – a low-luminosity millisecond pulsar with a planetary-mass companion

Spiewak, R. and Bailes, M. and Barr, E. D. and Bhat, N. D. R. and Burgay, M. and Cameron, A. D. and Champion, D. J. and Flynn, C. M. L. and Jameson, A. and Johnston, S. and Keith, M. J. and Kramer, M. and Kulkarni, S. R. and Levin, L. and Lyne, A. G. and Morello, V. and Ng, C. and Possenti, A. and Ravi, V. and Stappers, B. W. and van Straten, W. and Tiburzi, C. (2018) PSR J2322−2650 – a low-luminosity millisecond pulsar with a planetary-mass companion. Monthly Notices of the Royal Astronomical Society, 475 (1). pp. 469-477. ISSN 0035-8711. doi:10.1093/mnras/stx3157.

[img] PDF - Published Version
See Usage Policy.

[img] PDF - Accepted Version
See Usage Policy.

[img] Archive (ZIP) - Supplemental Material
See Usage Policy.


Use this Persistent URL to link to this item:


We present the discovery of a binary millisecond pulsar (MSP), PSR J2322−2650, found in the southern section of the High Time Resolution Universe survey. This system contains a 3.5-ms pulsar with a ∼10^(−3) M_⊙ companion in a 7.75-h circular orbit. Follow-up observations at the Parkes and Lovell telescopes have led to precise measurements of the astrometric and spin parameters, including the period derivative, timing parallax, and proper motion. PSR J2322−2650 has a parallax of 4.4 ± 1.2 mas, and is thus at an inferred distance of 230^(+90)_(−50) pc, making this system a candidate for optical studies. We have detected a source of R ≈ 26.4 mag at the radio position in a single R-band observation with the Keck telescope, and this is consistent with the blackbody temperature we would expect from the companion if it fills its Roche lobe. The intrinsic period derivative of PSR J2322−2650 is among the lowest known, 4.4(4) × 10^(−22) s s^(−1), implying a low surface magnetic field strength, 4.0(4) × 10^7 G. Its mean radio flux density of 160 μJy combined with the distance implies that its radio luminosity is the lowest ever measured, 0.008(5) mJy kpc^2. The inferred population of these systems in the Galaxy may be very significant, suggesting that this is a common MSP evolutionary path.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Bailes, M.0000-0003-3294-3081
Kulkarni, S. R.0000-0001-5390-8563
Ravi, V.0000-0002-7252-5485
Additional Information:© 2017 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2017 November 30. Received 2017 November 21; in original form 2017 August 10. We thank I. Andreoni for his assistance with reduction of the optical data, and P. Esposito for his advice regarding the X-ray data analysis. We also thank the anonymous referee for useful comments that significantly improved the paper. This research was funded partially by the Australian Government through the Australian Research Council, grants CE170100004 (OzGrav) and FL150100148. MK's research is supported by the ERC Synergy Grant ‘BlackHoleCam: Imaging the Event Horizon of Black Holes’ (Grant 610058). The Parkes radio telescope is part of the Australia Telescope National Facility that is funded by the Australian Government for operation as a National Facility managed by CSIRO. Pulsar research at the Jodrell Bank Centre for Astrophysics and the observations using the Lovell Telescope are supported by a consolidated grant from the STFC in the UK. Some of the data presented herein were obtained at the W.M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California, and the National Aeronautics and Space Administration. The Observatory was made possible by the generous financial support of the W.M. Keck Foundation. This work used the gSTAR national facility that is funded by Swinburne and the Australian Government's Education Investment Fund. This research made use of ASTROPY, a community-developed core PYTHON package for Astronomy (Astropy Collaboration, 2013), and the MATPLOTLIB package (v1.5.1; Hunter 2007).
Group:Astronomy Department
Funding AgencyGrant Number
Australian Research CouncilCE170100004
Australian Research CouncilFL150100148
European Research Council (ERC)610058
Commonwealth Scientific and Research Organization (CSIRO)UNSPECIFIED
Science and Technology Facilities Council (STFC)UNSPECIFIED
W. M. Keck FoundationUNSPECIFIED
Swinburne University of TechnologyUNSPECIFIED
Subject Keywords:pulsars: general – pulsars: individual: PSR J2322−2650
Issue or Number:1
Record Number:CaltechAUTHORS:20180411-135403772
Persistent URL:
Official Citation:R Spiewak, M Bailes, E D Barr, N D R Bhat, M Burgay, A D Cameron, D J Champion, C M L Flynn, A Jameson, S Johnston, M J Keith, M Kramer, S R Kulkarni, L Levin, A G Lyne, V Morello, C Ng, A Possenti, V Ravi, B W Stappers, W van Straten, C Tiburzi; PSR J2322−2650 – a low-luminosity millisecond pulsar with a planetary-mass companion, Monthly Notices of the Royal Astronomical Society, Volume 475, Issue 1, 21 March 2018, Pages 469–477,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:85760
Deposited By: George Porter
Deposited On:11 Apr 2018 22:32
Last Modified:15 Nov 2021 20:31

Repository Staff Only: item control page