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. Author manuscript; available in PMC: 2019 Oct 8.
Published in final edited form as: Nat Astron. 2019 Apr 8;3(6):553–560. doi: 10.1038/s41550-019-0746-7

Table 1.

Fitted and derived stellar and binary parameters for SDSS J2355+0448. sd and WD stand for cool subdwarf and white dwarf, respectively. We also include the right ascension and declination of the binary, the SDSS g-band magnitude, the Gaia parallax and the distance.

Parameter units value uncertainty
Orbital period days 0.089 778 006 5 0.000 000 002 4
Binary inclination degrees 89.7 0.2
Binary separation R 0.711 0.003
Mass ratio Msd / MWD 0.335 0.002
Centre of WD eclipse MJD(BTDB) 58074.107 683 0 0.000 008 7
Gaia parallax mas 1.89 0.46
Bayesian distance23 pc 541 -124 +216
Right ascension deg 358.85133
Declination deg 4.81539
SDSS g mag 19.59 0.01

WD Teff K 13,247 200
WD log g dex 7.680 0.075
WD cooling age Gyr 0.40 0.09
WD mass M 0.4477 0.0052

Ksd kms–1 296.5 3.3
γsd kms–1 -117.7 2.7
sd Teff K 3,650 50
sd bolometric luminosity L 4.3×10–3 2.4 ×10–3
sd spectral sub-type usdK7 ±1 subclass
sd [Fe/H] abundance dex -1.55 0.25
sd mass M 0.1501 0.0017
sd radius (towards WD) R 0.1821 0.0007
sd volume-averaged radius R 0.1669 0.0007