Unveiling the white dwarf in the eclipsing polar HU Aquarii

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Table 2.

Best-fit parameters for the u-band light curve.

Parameter	Unit	Value	Prior
M_WD	M_⊙	0.78 ± 0.02	U(0, 1.4)
M_sec	M_⊙	0.17 ± 0.01	U(0, 1.0)
Inclination i	deg	87.4 ± 0.9	U(0, 90)
T₀-53504	TDB	0.3848869(18)	U(0.3, 0.4)
Spot longitude χ	deg	46.9 ± 0.3	U(-180, 180)
Spot latitude δ	deg	$67 . 2_{- 4.1}^{+ 3.4}$ $67.2^{+3.4}_{-4.1}$	U(-90, 90)
Spot FWHM	deg	$44 . 0_{- 5.9}^{+ 6.5}$ $44.0^{+6.5}_{-5.9}$	U(0, 180)
Spot T_cen	K	$33 150_{- 5900}^{+ 8900}$ $33\,150^{+8900}_{-5900}$	U(0, 10⁵)

Notes. Best-fit parameters from fitting the ULTRACAM u-band light curve of HU Aqr from 14 May 2005. We note that T₀ corresponds to the center of the white dwarf eclipse, not the mid-egress time as is more typically used for HU Aqr. It is given in BJMD. The last column gives the range of the prior; flat priors were assumed for all parameters.

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