Uncovering the invisible: A study of Gaia18ajz, a candidate black hole revealed by microlensing

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Table 5.

Optimal parameter values for fitting Gaia18ajz, using Gaia and OGLE photometric data.

Parameter	GO0	GO+	GO−
t_0, par − 2450000 [days]	–	8231
t₀ − 2450000 [days]	$8259 . 4_{- 1.9}^{+ 1.9}$ $8259.4^{+1.9}_{-1.9}$	$8231 . 5_{- 1.1}^{+ 1.2}$ $8231.5^{+1.2}_{-1.1}$	$8232 . 7_{- 1.8}^{+ 1.8}$ $8232.7^{+1.8}_{-1.8}$
u₀	$0 . 241_{- 0.015}^{+ 0.015}$ $0.241^{+0.015}_{-0.015}$	$0 . 196_{- 0.026}^{+ 0.030}$ $0.196^{+0.030}_{-0.026}$	$- 0 . 228_{- 0.017}^{+ 0.023}$ $-0.228^{+0.023}_{-0.017}$
t_E [days]	$375_{- 20}^{+ 23}$ $375^{+23}_{-20}$	$316_{- 30}^{+ 36}$ $316^{+36}_{-30}$	$346_{- 20}^{+ 30}$ $346^{+30}_{-20}$
π_EN	–	$0 . 145_{- 0.026}^{+ 0.022}$ $0.145^{+0.022}_{-0.026}$	$- 0 . 0232_{- 0.0069}^{+ 0.0069}$ $-0.0232^{+0.0069}_{-0.0069}$
π_EE	–	$0 . 060_{- 0.010}^{+ 0.015}$ $0.060^{+0.015}_{-0.010}$	$0 . 0865_{- 0.0063}^{+ 0.0066}$ $0.0865^{+0.0066}_{-0.0063}$
G₀(Gaia) [mag]	$19 . 3451_{- 0.0079}^{+ 0.0083}$ $19.3451^{+0.0083}_{-0.0079}$	$19 . 2484_{- 0.0071}^{+ 0.0075}$ $19.2484^{+0.0075}_{-0.0071}$	$19 . 2497_{- 0.0060}^{+ 0.0063}$ $19.2497^{+0.0063}_{-0.0060}$
f_s, G(Gaia)	$1 . 106_{- 0.082}^{+ 0.083}$ $1.106^{+0.083}_{-0.082}$	$0 . 79_{- 0.12}^{+ 0.15}$ $0.79^{+0.15}_{-0.12}$	$0 . 96_{- 0.11}^{+ 0.09}$ $0.96^{+0.09}_{-0.11}$
I₀(OGLE) [mag]	$17 . 972_{- 0.020}^{+ 0.022}$ $17.972^{+0.022}_{-0.020}$	$17 . 819_{- 0.014}^{+ 0.017}$ $17.819^{+0.017}_{-0.014}$	$17 . 826_{- 0.010}^{+ 0.011}$ $17.826^{+0.011}_{-0.010}$
f_s, I(OGLE)	$1 . 278_{- 0.076}^{+ 0.076}$ $1.278^{+0.076}_{-0.076}$	$0 . 82_{- 0.12}^{+ 0.15}$ $0.82^{+0.15}_{-0.12}$	$1 . 02_{- 0.12}^{+ 0.09}$ $1.02^{+0.09}_{-0.12}$
χ²/d.o.f.	3.12	0.93	0.97

Notes. The model GO0 represents a point-source–point-lens configuration that does not take into account the microlensing parallax effect. On the other hand, models GO+ and GO− incorporate the microlensing parallax effect into the point-source–point-lens configuration. In the case of GO0, the model with u₀ > 0 was selected, as the posterior distribution for u₀ is symmetrical.

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