Radio timing constraints on the orbital orientation and component masses of PSR J1455−3330

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Volume 708 (April 2026)

A&A, 708 (2026) A213

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Table 4.

Binary timing parameters and associated mass and inclination values for J1455−3330.

Orbital model	T2		ELL1H
Keplerian parameters

Orbital period, P_b (days)	76.174574(6)
Projected semi-major axis of the pulsar orbit, x_p (s)	32.3622059(4)
Epoch of periastron, (T₀) (MJD)	56826.1169(3)
Orbital eccentricity, e	0.000169697(4)
Longitude of periastron at T₀, ω (°)	223.476(2)

Post-Keplerian parameters

	TN Run 1	TN Run 2
Orbital Inclination, i prior	U(0-90)	U(90-180)
Longitude of the ascending node, Ω prior	U(0-360)	U(270-450)
Orbital period derivative, Ṗ_b (10⁻¹³ s s⁻¹)	9(7)	11(7)
Rate of advance of periastron, $\dot{ω}$ $Mathematical equation: $ \dot{\omega} $$ (10⁻⁴ ° yr⁻¹)	1.5(1.3)	1.5(1.5)
Rate of change of orbital semi-major axis, ẋ (10⁻¹⁶ s s⁻¹)			−202(3)
Shapiro delay amplitude, h₃ (10⁻⁷ s)			$3 . 07_{- 0.26}^{+ 0.22}$ $Mathematical equation: $ 3.07^{+0.22}_{-0.26} $$
Orthometric ratio, ς			$0 . 551_{- 0.054}^{+ 0.057}$ $Mathematical equation: $ 0.551^{+0.057}_{-0.054} $$

Mass and orbital geometry measurements

Longitude of the ascending node, Ω (°)	212(12)	334(12)
Companion mass, M_c, (M_⊙)	$0 . 293_{- 0.026}^{+ 0.056}$ $Mathematical equation: $ 0.293^{+0.056}_{-0.026} $$	0.309 $_{- 0.026}^{+ 0.163}$ $Mathematical equation: $ ^{+0.163}_{-0.026} $$
Orbital inclination, i (deg)	63(2)	123(4)

Noise parameters

DM-noise amplitude (log₁₀A_DM)	–11.73(6)	–11.71(6)	–11.52(4)
DM-noise spectral index (α_DM)	1.6(2)	1.6(2)	1.3(1)

Derived parameters

Mass function, f (M_⊙)	0.00627158492 (21)
Pulsar mass, M_p (M_⊙)	1.39 $_{- 0.18}^{+ 0.38}$ $Mathematical equation: $ ^{+0.38}_{-0.18} $$	$1 . 53_{- 0.22}^{+ 1.10}$ $Mathematical equation: $ 1.53^{+1.10}_{-0.22} $$
Total kinematic contribution to Ṗ_b from Shklovskii effect, Ṗ_b,Shk, (10⁻¹³ s s⁻¹)	9.5(5)
Total kinematic contribution to Ṗ_b from Galactic rotation, Ṗ_b,Gal, (10⁻¹³ s s⁻¹)	5.61(25)
Intrinsic orbital period derivative (10⁻¹³ s s⁻¹), Ṗ_b,int	−6(7)

Notes. TN Run 1 and TN Run 2 correspond to two separate temponest runs, including different priors for i and Ω. U(x–y) denotes uniform distributions ranging from x to y for the relevant parameters.

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