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Fig. 2

image

Top: light curve for J171747 (automatically classified as EW-type) folded at P = 38 649.224 ± 0.006 s, with binned mean curve overplotted in red (colour version in online edition only). A representative error bar for a single observation is shown in the lower corner. Bottom: OC diagram for J171747 spanning eight years. Red (larger) points were automatically selected for period change determination; black (smaller) points were excluded as outliers (a few additional more extreme outliers fall outside the bounds of the plot). Blue solid line shows best linear fit (reduced χ2 = 13.58, 548 degrees of freedom); green dashed line shows best quadratic fit (χ2 = 1.03, 547 d.o.f.), strongly supporting a secular period increase, with rate 0.1466 ± 0.0018 s yr-1.

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