Table 2.
Timing parameters for PSR J0737−3039A using the TEMPO DDS binary model.
| Parameter | Value |
|---|---|
| Solar system ephemeris | DE436 |
| Terrestrial time standard | UTC(NIST) |
| Timescale | TDB |
| Position epoch (MJD) | 55045.0 |
| Timing epoch, t0 | 55700.0 |
| Astrometric parameters | |
| Right ascension (RA), α (J2000) | 07:37:51.248 121(26) |
| Declination (Dec), δ (J2000) | −30:39:40.705 36(42) |
| Proper motion RA, μα (mas yr−1) | −2.567(30) ( * ) |
| Proper motion Dec, μδ (mas yr−1) | 2.082(38) ( * ) |
| Parallax, πx (mas) | 1.36(+0.12, −0.10) ( * ) |
| Spin parameters | |
| Rotational frequency (freq.), ν (Hz) | 44.054 068 642 001(56) |
First freq. derivative,  (Hz s−1) |
−3.415 92(37)×10−15 |
Second freq. derivative,  (Hz s−2) |
−9.5(12)×10−27 |
| Binary parameters | |
| Orbital period, Pb (days) | 0.102 251 559 297 2(29) |
| Projected semi-major axis, x (s) | 1.415 028 299(88) |
| Eccentricity, eT | 0.087 777 036(48) |
| Epoch of periastron, T0 (MJD) | 55700.233 017 54(10) |
| Longitude of periastron, ω (deg) | 204.753 72(36) |
Periastron advance,  (deg yr−1) |
16.899 321(37) |
| Orbital period derivative (10−12), Ṗb | −1.247 920(78) ( * ) |
| Einstein delay amplitude, γE (ms) | 0.384 045(94) ( * ) |
| Logarithmic Shapiro shape, zs | 9.669(77) |
| Range of Shapiro delay, r (μs) | 6.163(16) |
| NLO factor for signal prop., qNLO | 0.999(79) |
| Derived parameters | |
| s ≡ sin i = 1 − e−zs | 0.999 936 9(+46/−51) |
| Orbital inclination, i (deg) | 89.36(3) or 90.64(3) |
| Mass of pulsar A, mA (M⊙) | 1.338 186(10) |
| Mass of pulsar B, mB (M⊙) | 1.248 866(7) |
| Total mass, M (M⊙) | 2.587 052(11) |
Notes. Numbers in parentheses are 1σ uncertainties applicable to the last digits, obtained from the standard deviation of 1000 MC runs or maximum error from TEMPO, whichever is larger. The overall reduced χ2 is 0.99. ( * )Values adopted from Kramer et al. (2021a).
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