OGLE-2015-BLG-1609Lb: A sub-Jovian planet orbiting a low-mass stellar or brown dwarf host

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Volume 698 (June 2025)

A&A, 698 (2025) A126

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Table 4

Lensing parameters, fitted to the OGLE data alone, using a Galactic model prior on π_E.

	Inner-large q, u₀+	Small q, u₀+	Outer-large q, u₀+
χ²/d.o.f.	807.1/831	832.0/831	822.2/831
Prior^(a)	7.93	6.97	7.10
q [10⁻³]	${1.21}_{- 0.29}^{+ 0.33}$ $\[1.21_{-0.29}^{+0.33}\]$	${0.241}_{- 0.017}^{+ 0.024}$ $\[0.241_{-0.017}^{+0.024}\]$	${1.37}_{- 0.44}^{+ 0.32}$ $\[1.37_{-0.44}^{+0.32}\]$
s	${1.375}_{- 0.036}^{+ 0.041}$ $\[1.375_{-0.036}^{+0.041}\]$	1.2310 ± 0.0091	${1.087}_{- 0.030}^{+ 0.060}$ $\[1.087_{-0.030}^{+0.060}\]$
t₀ [HJD^(b)]	${7261.913}_{- 0.073}^{+ 0.109}$ $\[7261.913_{-0.073}^{+0.109}\]$	${7261.807}_{- 0.076}^{+ 0.105}$ $\[7261.807_{-0.076}^{+0.105}\]$	${7261.882}_{- 0.074}^{+ 0.116}$ $\[7261.882_{-0.074}^{+0.116}\]$
u₀	0.332 ± 0.011	0.3255 ± 0.0100	0.319 ± 0.011
t_E [d]	27.65 ± 0.63	28.01 ± 0.60	28.09 ± 0.62
ρ	${0.0376}_{- 0.0132}^{+ 0.0068}$ $\[0.0376_{-0.0132}^{+0.0068}\]$	${0.0479}_{- 0.0018}^{+ 0.0024}$ $\[0.0479_{-0.0018}^{+0.0024}\]$	${0.033}_{- 0.020}^{+ 0.016}$ $\[0.033_{-0.020}^{+0.016}\]$
α [deg]	308.93 ± 0.47	${309.24}_{- 0.52}^{+ 0.62}$ $\[309.24_{-0.52}^{+0.62}\]$	309.88 ± 0.51
π_E,N^(c)	$- {0.01}_{- 0.29}^{+ 0.14}$ $\[-0.01_{-0.29}^{+0.14}\]$	${0.00}_{- 0.28}^{+ 0.15}$ $\[0.00_{-0.28}^{+0.15}\]$	$- {0.01}_{- 0.31}^{+ 0.14}$ $\[-0.01_{-0.31}^{+0.14}\]$
π_E,E^(c)	$- {0.035}_{- 0.042}^{+ 0.048}$ $\[-0.035_{-0.042}^{+0.048}\]$	−0.047 ± 0.042	$- {0.022}_{- 0.042}^{+ 0.048}$ $\[-0.022_{-0.042}^{+0.048}\]$

Notes. Parameters of the best 2L1S+parallax model topologies. ^(a)Prior probability density. ^(b)HJD–2450000. ^(c)For the reference time t_0,par = 2457267.5 HJD.

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