Table 3
Parameters for PSR J1618−3921 derived from the timing analysis.
| Timing and binary parameters | |
|---|---|
| Right ascension, α (J2000) | 16:18:18.8248(3) |
| Declination, δ (J2000) | −39:21:01.815(10) |
| Rotational period, P (ms) | 11.987308585310(22) |
| Period derivative, Ṗ (10−20) | 5.408(18) |
| Dispersion measure, DM (cm−3pc) | 117.965(11) |
| Orbital period, Pb (d) | 22.74559403(19) |
| Projected semi-major axis of orbit, x (lt-s) | 10.278300(5) |
| Epoch of periastron, T0 (MJD) | 56012.21639(15) |
| Longitude of periastron, ω (°) | −6.717(3) |
| Orbital eccentricity, e | 0.0274133(10) |
| Span of timing data (MJD) | 54 963.0–57 869.1 |
| Number of TOAs | 70 |
| Weighted residual rms (μs) | 25.3 |
| Reduced χ2 value | 1.2 |
| Derived parameters | |
| Mass function, f (M⊙) | 0.00225347(9) |
| Minimum companion mass, mc (M⊙) | 0.1736 |
| Galactic longitude, l (°) | 340.72 |
| Galactic latitude, b (°) | 7.89 |
| Proper motion, μT (mas yr−1) | <6.0 |
| Characteristic age, τ (109 yr) | 3.5 |
| Surface magnetic field strength, B (108 G) | 8.14 |
| Magnetic field strength at the light cylinder, BLC (103 G) | 4.4 |
| Spin-down luminosity, Ė (1033 erg s−1) | 1.24 |
| Distance inferred from the NE2001 model, dNE2001 (kpc) | 2.7 |
| Distance inferred from the YMW16 model, dYMW16 (kpc) | 5.5 |
Notes. Thereference epoch for the position and for the period is MJD 56000. We used the DE421 solar system ephemeris, and time units are in barycentric dynamic time (TDB). Numbers in parentheses represent 1σ TEMPO2 uncertainties in the last digits quoted. The DM value was estimated independently from the other parameters (see Sect. 2). The pulsar mass used to calculate the minimum companion mass is 1.35 M⊙. See Lorimer & Kramer (2004) for the calculation of τ, B, BLC and Ė. Distance estimates were inferred from the NE2001 model of Cordes & Lazio (2002) and the YMW16 model of Yao et al. (2017).
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