Timing of the 2008 outburst of SAX J1808.4–3658 with XMM-Newton: a stable orbital-period derivative over ten years

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Table 1:

Best-fit orbital solution for SAX J1808.4-3658 derived from the analysis of the five outbursts observed from 1998 to 2008.
Parameter	Units	Value
T^*₁₉₉₈	MJD	50 914.79452952(85)
$P_{{\rm orb}}$	s	7249.156444(23)
$\dot{P}_{{\rm orb}}$	10^-12 s/s	3.89(15)
$a_1 \sin i / c$	s	0.0628106(20)
e		< $1.2 \times 10^{-4}$
$\nu_{2008}$	Hz	400.9752084532(17)
T^*₂₀₀₈	MJD	54 739.98342965

Note: errors are at $90\%$ c.l. on the last 2 digits. The upper limit on the eccentricity is at $95\%$ c.l. The values of $P_{{\rm orb}}$ and $\dot{P}_{{\rm orb}}$ are referred to T^*₁₉₉₈, while the value of $\nu_{2008}$ is referred to T^*₂₀₀₈.

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