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

Journal
Date Issued
2018
Author(s)
Spiewak, R.
•
Bailes, M.
•
Barr, E. D.
•
Bhat, N. D. R.
•
•
Cameron, A. D.
•
Champion, D. J.
•
Flynn, C. M. L.
•
Jameson, A.
•
Johnston, S.
•
Keith, M. J.
•
Kramer, M.
•
Kulkarni, S. R.
•
Levin, L.
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Lyne, A. G.
•
Morello, V.
•
Ng, C.
•
•
Ravi, V.
•
Stappers, B. W.
•
van Straten, W.
•
DOI
Abstract
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) × 107 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 kpc2. The inferred population of these systems in the Galaxy may be very significant, suggesting that this is a common MSP evolutionary path.
Volume
475
Issue
1
Start page
469
Uri
Url
Issn Identifier
0035-8711
Ads BibCode
2018MNRAS.475..469S
Rights
open.access
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