The GAPS Programme at TNG - LVIII. Two multi-planet systems with long-period substellar companions around metal-rich stars

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Volume 689 (September 2024)

A&A, 689 (2024) A235

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Table 5

Planetary parameters obtained from the RV analysis using full-Keplerian models.

Parameter	HD 75898		HD 11506
	b	С	b	с	d
m sin i [M_J]	2.55 ± 0.04	${3.78}_{- 0.59}^{+ 0.52}$ $3.78_{ - 0.59}^{ + 0.52}$	4.80 ± 0.08	0.40 ± 0.02	${15.3}_{- 4.5}^{+ 9.3}$ $15.3_{ - 4.5}^{ + 9.3}$
P[d]	422.82 ± 0.22	$6690_{- 277}^{+ 323}$ $6690_{ - 277}^{ + 323}$	1617.7 ± 1.9	223.92 ± 0.37	$27597_{- 8576}^{+ 15674}$ $27597_{ - 8576}^{ + 15674}$
a [au]	1.2025 ± 0.0047	${7.58}_{- 0.21}^{+ 0.24}$ $7.58_{ - 0.21}^{ + 0.24}$	2.885 ± 0.016	0.771 ± 0.004	${19.2}_{- 4.2}^{+ 6.8}$ $19.2_{ - 4.2}^{ + 6.8}$
e	0.105 ± 0.009	0.147 + 0.091	0.379 ± 0.009	0.228 ± 0.054	${0.133}_{- 0.095}^{+ 0.140}$ $0.133_{ - 0.095}^{ + 0.140}$
ω [degrees]	−116.8 ± 5.1	$103_{- 81}^{+ 40}$ $103_{ - 81}^{ + 40}$	−140.7 ± 1.5	−120±16	$- 17_{- 84}^{+ 116}$ $- 17_{ - 84}^{ + 116}$
K[m s⁻¹]	58.4 ± 0.8	${34.7}_{- 5.3}^{+ 4.6}$ $34.7_{ - 5.3}^{ + 4.6}$	78.5 ± 0.9	12.0 ± 0.6	$90_{- 18}^{+ 42}$ $90_{ - 18}^{ + 42}$
T₀ [BJD -2450000]	3303 ± 6	$3832_{- 821}^{+ 1225}$ $3832_{ - 821}^{ + 1225}$	3398 ± 7	3212± 11	$3758_{- 5870}^{+ 9696}$ $3758_{ - 5870}^{ + 9696}$
P_cycle [d]	$781_{- 57}^{+ 72}$ ${\rm{781}}_{ - 57}^{ + 72}$		–
K_cycle [m s⁻¹]	${8.6}_{- 1.9}^{+ 2.6}$ $8.6_{ - 1.9}^{ + 2.6}$		–
γHARPS-N [ms⁻¹]	${21850.1}_{- 3.6}^{+ 3.5}$ $21850.1_{ - 3.6}^{ + 3.5}$		$- 7424_{- 26}^{+ 37}$ $- 7424_{ - 26}^{ + 37}$
γHIRES [ms⁻¹]	${15.0}_{- 3.6}^{+ 3.4}$ $15.0_{ - 3.6}^{ + 3.4}$		$- 23_{- 26}^{+ 35}$ $- 23_{ - 26}^{ + 35}$ (pre-upgrade)
			$- 20_{- 25}^{+ 38}$ $- 20_{ - 25}^{ + 38}$ (post-upgrade)
jitter HARPS-N [m s⁻¹]	${3.64}_{- 0.27}^{+ 0.30}$ $3.64_{ - 0.27}^{ + 0.30}$		${4.16}_{- 0.40}^{+ 0.46}$ $4.16_{ - 0.40}^{ + 0.46}$
jitter HIRES [m s⁻¹]	${4.12}_{- 0.37}^{+ 0.42}$ $4.12_{ - 0.37}^{ + 0.42}$		${16.2}_{- 5.2}^{+ 9.5}$ $16.2_{ - 5.2}^{ + 9.5}$ (pre-upgrade)
			${6.47}_{- 0.53}^{+ 0.59}$ $6.47_{ - 0.53}^{ + 0.59}$ (post-upgrade)

Notes. Physical and orbital parameters for the planets of all three targets derived from RV fitting. The reported values are the medians of the resulting distributions and the error bars are the 15th and 84th percentiles, respectively. The parameter T₀ is the time of the periastron passage calculated with reference time BJD = 2 453 000.

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