The GAPS programme at TNG - LXIV. An inner eccentric sub-Neptune and an outer sub-Neptune-mass candidate around BD+00 444 (TOI-2443)

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Volume 693 (January 2025)

A&A, 693 (2025) A7

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Table 2

Planet parameters.

Parameters	BD+00 444 b	BD+00444b	BD+00444c
	(1p model)	(2p model)	(2p model)
Transit and orbital
K (m s⁻¹)	${2.23}_{- 0.38}^{+ 0.37}$ ${2.23_{ - 0.38}^{ + 0.37}}$	${1.74}_{- 0.39}^{+ 0.40}$ ${1.74_{ - 0.39}^{ + 0.40}}$	${1.73}_{- 0.37}^{+ 0.34}$ ${1.73_{ - 0.37}^{ + 0.34}}$
P_orb (d)	${15.66858}_{- 0.00015}^{+ 0.00011}$ $15.66858_{ - 0.00015}^{ + 0.00011}$	15.66858 ± 0.00010	96.6 ± 1.4
T₀ (BJD − 2459 000)	148.09923 ± 0.00060	148.09939 ± 0.00051	${235.2}_{- 6.2}^{+ 6.4}$ $235.2_{ - 6.2}^{ + 6.4}$
T₁₄ (h)	${4.548}_{- 0.046}^{+ 0.054}$ $4.548_{ - 0.046}^{ + 0.054}$	${4.548}_{- 0.047}^{+ 0.053}$ $4.548_{ - 0.047}^{ + 0.053}$	…
R_P/R_★	0.03432 ± 0.00069	0.03436 ± 0.00062	…
b	0.25 ± 0.15	0.22 ± 0.15	…
i (deg)	${89.69}_{- 0.17}^{+ 0.19}$ $89.69_{ - 0.17}^{ + 0.19}$	${89.72}_{- 0.18}^{+ 0.17}$ $89.72_{ - 0.18}^{ + 0.17}$	…
a/R_★	${35.8}_{- 0.79}^{+ 0.76}$ $35.8_{ - 0.79}^{ + 0.76}$	${35.8}_{- 0.76}^{+ 0.74}$ $35.8_{ - 0.76}^{ + 0.74}$	120±3
q₁	${0.25}_{- 0.13}^{+ 0.18}$ $0.25_{ - 0.13}^{ + 0.18}$	${0.26}_{- 0.14}^{+ 0.21}$ $0.26_{ - 0.14}^{ + 0.21}$	…
q₂	${0.34}_{- 0.21}^{+ 0.25}$ $0.34_{ - 0.21}^{ + 0.25}$	${0.30}_{- 0.18}^{+ 0.22}$ $0.30_{ - 0.18}^{ + 0.22}$	…
$\sqrt{e} sin ω$ ${\sqrt e }$	$- {0.55}_{- 0.04}^{+ 0.03}$ ${ - 0.55_{ - 0.04}^{ + 0.03}}$	$- {0.54}_{- 0.04}^{+ 0.03}$ ${ - 0.54_{ - 0.04}^{ + 0.03}}$	…
$\sqrt{e} cos ω$ ${\sqrt e }$	0.02 ± 0.11	0.04 ± 0.11	…
Derived
M_p (M_⊕)	${6.1}_{- 1.1}^{+ 1.0}$ $6.1_{ - 1.1}^{ + 1.0}$	4.8 ± 1.1	…
M_p sin i (M_⊕)	…	…	${9.3}_{- 2.0}^{+ 1.8}$ $9.3_{ - 2.0}^{ + 1.8}$
^Rp ^(R_⊕⁾	2.363 ± 0.066	2.363 ± 0.066	…
ρ_p (g cm⁻³)	${2.56}_{- 0.46}^{+ 0.48}$ $2.56_{ - 0.46}^{ + 0.48}$	${2.00}_{- 0.45}^{+ 0.49}$ $2.00_{ - 0.45}^{ + 0.49}$	…
log ɡ_p (cgs)	10.8 ± 1.9	${8.4}_{- 1.9}^{+ 2.0}$ $8.4_{ - 1.9}^{ + 2.0}$	…
a (au)	0.1051 ± 0.0026	0.1050 ± 0.0025	0.3529 ± 0.0093
T_eq^(‡) (K)	519±6	519±6	283 ± 4
e	${0.308}_{- 0.035}^{+ 0.047}$ ${0.308_{ - 0.035}^{ + 0.047}}$	${0.301}_{- 0.034}^{+ 0.046}$ ${0.301_{ - 0.034}^{ + 0.046}}$	<0.50
ω (deg)	$- 88_{- 11}^{+ 9}$ $- 88_{ - 11}^{ + 9}$	−86 ± 11	unconstrained
TSM^(*)	$124_{- 19}^{+ 28}$ $124_{ - 19}^{ + 28}$	$159_{- 31}^{+ 46}$ $159_{ - 31}^{ + 46}$	…
u₁(TESS)	${0.34}_{- 0.14}^{+ 0.15}$ $0.34_{ - 0.14}^{ + 0.15}$	${0.31}_{- 0.13}^{+ 0.14}$ $0.31_{ - 0.13}^{ + 0.14}$	…
u₂ (TESS)	${0.15}_{- 0.12}^{+ 0.14}$ ${0.15_{ - 0.12}^{ + 0.14}}$	${0.19}_{- 0.12}^{+ 0.13}$ ${0.19_{ - 0.12}^{ + 0.13}}$	…
u₁ (LCO_Y)	${0.72}_{- 0.28}^{+ 0.30}$ $0.72_{ - 0.28}^{ + 0.30}$	${0.78}_{- 0.27}^{+ 0.30}$ $0.78_{ - 0.27}^{ + 0.30}$	…
u₂(LCO_Y)	${0.06}_{- 0.27}^{+ 0.28}$ $0.06_{ - 0.27}^{ + 0.28}$	$- {0.02}_{- 0.26}^{+ 0.26}$ $- 0.02_{ - 0.26}^{ + 0.26}$	…
u₁(LCO_zs)	${0.70}_{- 0.25}^{+ 0.28}$ ${0.70_{ - 0.25}^{ + 0.28}}$	${0.79}_{- 0.25}^{+ 0.28}$ ${0.79_{ - 0.25}^{ + 0.28}}$	…
u₂(LCO_zs)	${0.00}_{- 0.24}^{+ 0.23}$ ${0.00_{ - 0.24}^{ + 0.23}}$	$- {0.11}_{- 0.24}^{+ 0.23}$ ${ - 0.11_{ - 0.24}^{ + 0.23}}$	…
Instrumental
σ_w,TESS ^(ppt)	${0.000070}_{- 0.000012}^{+ 0.000018}$ ${0.000070_{ - 0.000012}^{ + 0.000018}}$	${0.000070}_{- 0.000012}^{+ 0.000021}$ ${0.000070_{ - 0.000012}^{ + 0.000021}}$	…
ρ_TESS (d)	${0.72}_{- 0.28}^{+ 0.48}$ ${0.72_{ - 0.28}^{ + 0.48}}$	${0.67}_{- 0.25}^{+ 0.46}$ ${0.67_{ - 0.25}^{ + 0.46}}$	…
${\bar{μ}}_{HARPS-N}$ ${\bar \mu _{{\rm{HARPS - N }}}}$ ^{(m s−1)}	${72986.06}_{- 0.25}^{+ 0.24}$ ${72986.06_{ - 0.25}^{ + 0.24}}$	${72986.35}_{- 0.24}^{+ 0.23}$ ${72986.35_{ - 0.24}^{ + 0.23}}$	…
σ_w,HARPS-N (m s⁻¹)	2.25 ± 0.20	${1.96}_{- 0.19}^{+ 0.24}$ ${1.96_{ - 0.19}^{ + 0.24}}$	…

Notes. Best-fit median values, with upper and lower 68% credibility bands as errors, of the fitted and derived parameters for BD+00 444 b and BD+00 444 c, as extracted from the posterior distribution of the relative models (refer to Sect. 6). ^(‡)This is the equilibrium temperature for a zero Bond albedo and uniform heat redistribution to the night side. The eccentricity upper limit is constrained at the confidence level of 1σ. ^(*)Transmission spectroscopy metric (TSM; Kempton et al. 2018).

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