HST pre-imaging of a free-floating planet candidate microlensing event

Open Access

Table 2

Microlensing parameters computed with and without a prior on the source’s star magnitude.

	w/t prior	w/prior
Microlensing model
t₀ (HJD-246 000)	86.69562 ± 0.00062	86.69560 ± 0.00063
t_* (d)	${0.0504}_{- 0.0010}^{+ 0.0011}$ $0.0504^{+0.0011}_{-0.0010}$	0.05162 ± 0.00071
b₀	0.20 ± 0.13	${0.318}_{- 0.055}^{+ 0.044}$ $0.318^{+0.044}_{-0.055}$
ρ	${0.119}_{- 0.018}^{+ 0.024}$ $0.119^{+0.024}_{-0.018}$	0.1492 ± 0.0034
t_E (d)	0.429 ± 0.068	0.3460 ± 0.0083
u₀	${0.023}_{- 0.016}^{+ 0.021}$ $0.023_{-0.016}^{+0.021}$	${0.0474}_{- 0.0079}^{+ 0.0062}$ $0.0474_{-0.0079}^{+0.0062}$
χ²/d.o.f.	6660.86/6359	6661.65/6359
Source star parameters
I_S	${19.732}_{- 0.235}^{+ 0.193}$ $19.732_{-0.235}^{+0.193}$	19.444 ± 0.023
θ_* (μas)	${0.626}_{- 0.059}^{+ 0.075}$ $0.626 ^{+0.075}_{-0.059}$	0.713 ± 0.033
Physical parameters
θ_E (μas)	${5.25}_{- 0.44}^{+ 0.47}$ $5.25^{+0.47}_{-0.44}$	4.78 ± 0.23
μ_rel (mas yr⁻¹)	${4.54}_{- 0.39}^{+ 0.46}$ $4.54^{+0.46}_{-0.39}$	5.04 ± 0.25
separation (mas)	$117_{- 12}^{+ 13}$ $117^{+13}_{-12}$	129 ± 8

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