HADES RV Programme with HARPS-N at TNG - XVI. A super-Earth in the habitable zone of the GJ 3998 multi-planet system

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Table 2

Planetary parameters from our best model (d4; Table C.6).

Parameter symbol	Unit	This work
GJ 3998 b
P_b	d	${2.65033}_{- (19)}^{+ (22)}$ $2.65033_{ - (19)}^{ + (22)}$
φ_b	–	${0.148}_{- 0.094}^{+ 0.082}$ $0.148_{ - 0.094}^{ + 0.082}$
ε_b	BJD-2 400 000	${60202.964}_{- 0.216}^{+ 0.249}$ $60202.964_{ - 0.216}^{ + 0.249}$
k_{rv, b}	m s⁻¹	1.79 ± 0.18
e_b	–	0
a_b	AU	0.030 ± 0.001
m_b sin i_b	M_⊕	${2.50}_{- 0.29}^{+ 0.30}$ $2.50_{ - 0.29}^{ + 0.30}$
Φ_b	Φ_⊕	$48_{- 9}^{+ 11}$ $48_{ - 9}^{ + 11}$
GJ 3998 c
P_c	d	${13.727}_{- 0.004}^{+ 0.003}$ $13.727_{ - 0.004}^{ + 0.003}$
φ_c	–	${0.466}_{- 0.051}^{+ 0.055}$ $0.466_{ - 0.055}^{ + 0.051}$
ε_c	BJD-2 400 000	${60196.96}_{- 0.75}^{+ 0.70}$ $60196.96_{ - 0.75}^{ + 0.70}$
k_{rv, c}	m s⁻¹	2.86 ± 0.26
e_c	–	0
a_c	AU	0.090 ± 0.003
m_c sin i_c	M_⊕	${6.82}_{- 0.75}^{+ 0.78}$ $6.82_{ - 0.75}^{ + 0.78}$
Φ_c	Φ_⊕	${5.4}_{- 1.0}^{+ 1.3}$ $5.4_{ - 1.0}^{ + 1.3}$
GJ 3998 d
P_d	d	41.78 ± 0.05
φ_d	–	${0.785}_{- 0.080}^{+ 0.076}$ $0.785_{ - 0.080}^{ + 0.006}$
ε_d	BJD-2 400 000	${60170.55}_{- 3.15}^{+ 3.29}$ $60170.55_{ - 3.15}^{ + 3.29}$
k_{rv, d}	m s⁻¹	${1.74}_{- 0.25}^{+ 0.26}$ $1.74_{ - 0.25}^{ + 0.26}$
e_d	–	0
a_d	AU	0.189 ± 0.006
m_d sin i_d	M_⊕	${6.07}_{- 0.96}^{+ 1.00}$ $6.07_{ - 0.96}^{ + 1.00}$
Φ_d	Φ_⊕	${1.2}_{- 0.2}^{+ 0.3}$ $1.2_{ - 0.2}^{ + 0.3}$

Notes. Reported uncertainties reflect the 16^th and the 84^th percentiles. P_b uncertainties are given in parentheses, to the order of the least significant figure of the nominal value.

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