Table 3.
Terms associated with the variation of the orbital period.
| YMW16 | NE2001 | |
|---|---|---|
| (fs s−1) | ||
| Ṗb,obs | −1829.6(15) | |
| Ṗb,GR | −1828.7(1) | |
| ΔṖb |
 |
|
| Ṗb,gal | −1.93(62) | −2.46(68) |
| Ṗb,shk | +1.05(23) | +1.25(28) |
| Ṗb,ext | −0.88(66) | −1.21(74) |
| Ṗb,int | −1828.8(16) | −1828.4(16) |
| Ṗb,xs | −0.1(16) | +0.3(16) |
Notes. The term ΔṖb = Ṗb,obs − Ṗb,GR represents a constraint on the sum external contributions to Ṗb, this is calculated in detail in Sect. 4.1; this value is represented by the gray bar in Fig. 6. The sum of the external contributions calculated by our models for the two assumed distances, Ṗb,ext = Ṗb,gal + Ṗb,shk, are in good agreement with ΔṖb (see red band in Fig. 6). The intrinsic Ṗb, Ṗb,int is defined as Ṗb,obs − Ṗb,gal − Ṗb,shk; if GR is correct, this should match Ṗb,GR. The difference between Ṗb,int and Ṗb,GR is the “excess” variation of the orbital period, Ṗb,xs which quantifies possible deviations from GR.
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