Eccentric and cool: A high-spectral-resolution view of 51 Eri b with VLT/HiRISE

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Table 2.

Orbital parameters inferred in this work.

Parameter	Posterior	χ_min²
Semi-major axis a (au)	$9 . 08_{- 0.19}^{+ 0.57}$ $Mathematical equation: $ 9.08_{-0.19}^{+0.57} $$	8.91
Eccentricity e	$0 . 55_{- 0.07}^{+ 0.03}$ $Mathematical equation: $ 0.55_{-0.07}^{+0.03} $$	0.58
Inclination i (°)	$159 . 24_{- 11.48}^{+ 5.74}$ $Mathematical equation: $ 159.24_{-11.48}^{+5.74} $$	165
Argument of periastron ω (°)	$55 . 41_{- 30.75}^{+ 51.00}$ $Mathematical equation: $ 55.41_{-30.75}^{+51.00} $$	84
Ascending node Ω (°)	$58 . 25_{- 47.60}^{+ 80.80}$ $Mathematical equation: $ 58.25_{-47.60}^{+80.80} $$	69
period P (years)	$23 . 49_{- 0.86}^{+ 1.74}$ $Mathematical equation: $ 23.49_{-0.86}^{+1.74} $$	22.76
Periastron passage τ^a	$0 . 33_{- 0.03}^{+ 0.02}$ $Mathematical equation: $ 0.33_{-0.03}^{+0.02} $$	0.33

Notes.

^(a)

The periastron passage is computed as $τ = \frac{t_{p} - t_{ref}}{P}$ $Mathematical equation: $ \tau =\frac{t_{\mathrm{p}} - t_{\mathrm{ref}}}{P} $$ , where t_ref is the reference time at epoch J2020.0 (t_ref = 58849 MJD) and t_p is the time of periastron.

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