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

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Table 3.

Optimal parameter values for fitting Gaia18ajz using only Gaia photometric data.

Parameter	G0	G+	G−
t_0, par − 2450000 [days]	–	8231
t₀ − 2450000 [days]	$8256 . 2_{- 3.2}^{+ 3.1}$ $8256.2^{+3.1}_{-3.2}$	$8229 . 4_{- 3.6}^{+ 3.3}$ $8229.4^{+3.3}_{-3.6}$	$8227 . 3_{- 4.0}^{+ 4.1}$ $8227.3^{+4.1}_{-4.0}$
u₀	$0 . 362_{- 0.034}^{+ 0.034}$ $0.362^{+0.034}_{-0.034}$	$0 . 239_{- 0.050}^{+ 0.051}$ $0.239^{+0.051}_{-0.050}$	$- 0 . 224_{- 0.052}^{+ 0.053}$ $-0.224^{+0.053}_{-0.052}$
t_E [days]	$232_{- 15}^{+ 17}$ $232^{+17}_{-15}$	$347_{- 51}^{+ 64}$ $347^{+64}_{-51}$	$353_{- 50}^{+ 81}$ $353^{+81}_{-50}$
π_EN	–	$0 . 055_{- 0.035}^{+ 0.054}$ $0.055^{+0.054}_{-0.035}$	$- 0 . 011_{- 0.023}^{+ 0.023}$ $-0.011^{+0.023}_{-0.023}$
π_EE	–	$0 . 128_{- 0.035}^{+ 0.030}$ $0.128^{+0.030}_{-0.035}$	$0 . 098_{- 0.011}^{+ 0.011}$ $0.098^{+0.011}_{-0.011}$
G₀ [mag]	$19 . 2744_{- 0.0085}^{+ 0.0087}$ $19.2744^{+0.0087}_{-0.0085}$	$19 . 2479_{- 0.0078}^{+ 0.0083}$ $19.2479^{+0.0083}_{-0.0078}$	$19 . 2466_{- 0.0077}^{+ 0.0083}$ $19.2466^{+0.0083}_{-0.0077}$
f_s, G	$1 . 90_{- 0.23}^{+ 0.24}$ $1.90^{+0.24}_{-0.23}$	$1 . 02_{- 0.25}^{+ 0.28}$ $1.02^{+0.28}_{-0.25}$	$0 . 95_{- 0.26}^{+ 0.28}$ $0.95^{+0.28}_{-0.26}$
χ²/d.o.f.	2.81	0.98	0.98

Notes. The model G0 represents a point-source–point-lens configuration that does not take into account the microlensing parallax effect. On the other hand, models G+ and G− incorporate the microlensing parallax effect into the point-source–point-lens configuration. In the case of G0, the model with u₀ > 0 was selected, as the posterior distribution for u₀ is symmetrical.

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