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Table 3.
Timing parameters for the pulsars Ter5aq, Ter5ar and Ter5at as obtained from fitting the observed ToAs with TEMPO.
| Pulsar | J1748−2446aq | J1748−2446ar | J1748−2446at |
|---|---|---|---|
| Right ascension, α (J2000) | 17:48:04.7344(2) | 17:48:04.6141(5) | 17:48:05.36261(3) |
| Declination, δ (J2000) | −24:46:42.8(1) | −24:46:45.4(2) | −24:46:47.07(1) |
| Proper motion in α, μα (mas yr−1) | −1.7(5) | – | −1.93(9) |
| Proper motion in δ, μδ (mas yr−1) | −5.243 | – | −7(3) |
| Spin frequency, f (Hz) | 79.859813034659(7) | 512.082391773(1) | 456.999686853575(9) |
| 1st spin frequency derivative, ḟ (Hz s−1) | 4.56767(9) × 10−15 | 6.94(2) × 10−14 | 1.232138(8) × 10−14 |
2nd spin frequency derivative,  (Hz s−2) |
2.303(5) × 10−25 | −3.9(3) × 10−22 | 1.583(6) × 10−25 |
3rd spin frequency derivative,  (Hz s−3) |
−6(1) × 10−35 | −2.9(4) × 10−29 | −5(1) × 10−35 |
4th spin frequency derivative,  (Hz s−4) |
– | 7(6) × 10−36 | – |
| Reference epoch (MJD) | 56 674.129312 | 53500.000000 | 56 500.000000 |
| Start of timing data (MJD) | 53 204.063 | 53 193.201 | 53 193.239 |
| End of timing data (MJD) | 60 144.196 | 53 957.153 | 60 144.199 |
| Dispersion measure, DM (pc cm−3) | 238.941(7) | 238.664(7) | 239.469(2) |
| Solar system ephemeris | DE440 | DE440 | DE440 |
| Terrestrial time standard | TT(BIPM) | TT(BIPM) | TT(BIPM) |
| Time units | TDB | TDB | TDB |
| Number of TOAs | 422 | 189 | 519 |
| Residuals RMS (μs) | 88.56 | 51.19 | 17.70 |
| S1284 (mJy) | 0.017 | 0.044 | 0.019 |
| L1284 (mJy kpc2) | 0.730 | 1.940 | 0.821 |
| Angular offset from nominal cluster centre (arcmin) | 0.038 | 0.055 | 0.123 |
| Binary parameters | |||
| Binary model | BTX | BTX | BTX |
| Projected semi-major axis, xp (lt-s) | 0.025864(6) | 1.498554(8) | 0.100652(1) |
| Orbital eccentricity, e | 0.0 | 0.0 | 0.0 |
| Longitude of periastron, ω (deg) | 0.0 | 0.0 | 0.0 |
| Epoch of passage at periastron, T0 (MJD) | 59 220.484743(6) | 53 495.2744189(5) | 59 097.7002667(4) |
| Orbital period, Pb (days) | 0.1186466908(2) | 0.513338728(4) | 0.2188829327(1) |
| Orbital frequency, fb (s−1) | 9.75507533(2) × 10−5 | 2.25466606(2) × 10−5 | 5.287791939(2) |
1st orbital freq. derivative,  (s−2) |
– | 5.1(4) × 10−19 | 5.4(3) × 10−21 |
2nd orbital freq. derivative,  (s−3) |
– | 9.8(7) × 10−26 | 7(2) × 10−30 |
3rd orbital freq. derivative,  (s−4) |
– | −1.3(2) × 10−32 | – |
4th orbital Freq. derivative,  (s−5) |
– | −1.3(2) × 10−39 | – |
5th orbital Freq. derivative,  (s−6) |
– | 4.2(6) × 10−46 | – |
6th orbital Freq. derivative,  (s−7) |
– | −2.8(9) × 10−53 | – |
| Derived parameters | |||
| Spin period, P (s) | 1.25219427059248(8) × 10−2 | 1.952810750899(4) × 10−3 | 2.18818530683239(4) × 10−3 |
| 1st spin period derivative, Ṗ (s s−1) | −7.16198(6) × 10−19 | −2.648(9) × 10−19 | −5.89966(4) × 10−20 |
| Mass function, f(Mp) (M⊙) | 1.3197(9) × 10−6 | 1.37117(2) × 10−2 | 2.28523(7) × 10−5 |
| Minimum companion mass, Mc, min (M⊙) | 0.013 | 0.339 | 0.035 |
| Median companion mass, Mc, med (M⊙) | 0.015 | 0.401 | 0.041 |
Notes. These pulsars are grouped together given their spider nature. Same assumptions have been made as stated earlier in Table 2.
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