Unveiling the nature of HE 0107–5240: a long period binary CEMP-no star with [Fe/H] of –5.56

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Table 2

Revised orbital parameters of HE 0107−5240 derived using a Markov chain Monte Carlo (MCMC) analysis.

Parameter	MCMC Priors	Results
Keplerian orbit

k₂ (kms^–1)	ℒ𝒰 (0.1, 5)	${1.67}_{- 0.07}^{+ 0.08}$ $1.67_{ - 0.07}^{ + 0.08}$
P₂(d)	ℒ𝒰 (1000, 75000)	$10560_{- 518}^{+ 786}$ $10560_{ - 518}^{ + 786}$
T₂ – 2450 000 (d)	𝒰 (–4000, 3500)	$494_{- 706}^{+ 492}$ $494_{ - 706}^{ + 492}$
ω (rad)	𝒰 (–π, π)	$- {2.87}_{- 0.16}^{+ 0.20}$ $- 2.87_{ - 0.16}^{ + 0.20}$
e	𝒰 (0, 1)	${0.24}_{- 0.08}^{+ 0.08}$ $0.24_{ - 0.08}^{ + 0.08}$

Other terms

jitter_UVES (kms⁻¹)	ℒ𝒰 (0.01, 5.0)	${0.24}_{- 0.06}^{+ 0.08}$ $0.24_{ - 0.06}^{ + 0.08}$
jitter_HRS (kms⁻¹)	ℒ𝒰 (0.01, 5.0)	${0.03}_{- 0.02}^{+ 0.08}$ $0.03_{ - 0.02}^{ + 0.08}$
jitter_ESPRESSO (kms⁻¹)	ℒ𝒰 (0.01, 5.0)	${0.03}_{- 0.01}^{+ 0.01}$ $0.03_{ - 0.01}^{ + 0.01}$
jitter_HARPS (kms⁻¹)	ℒ𝒰 (0.01, 5.0)	${0.05}_{- 0.03}^{+ 0.12}$ $0.05_{ - 0.03}^{ + 0.12}$
γ – 46.5 (km s⁻¹)	𝒰 (−3.0, 3.0)	${0.35}_{- 0.17}^{+ 0.14}$ $0.35_{ - 0.17}^{ + 0.14}$

Notes. The uncertainties for each quantity correspond to the 16th and 84th percentile, which covers the 68% (1 − σ) of all samples.

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