An accreting dwarf star orbiting the S-type giant star π1 Gru

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Volume 699 (July 2025)

A&A, 699 (2025) A22

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Table 1.

Best-fit orbital parameters of π¹ Gru C from the UltraNest run.

Parameters	Values
M_A	1.54−2.19 M_⊙
q	$0 . 48_{- 0.08}^{+ 0.08}$ $0.48^{+0.08}_{-0.08}$
a	$7 . 05_{- 0.57}^{+ 0.54}$ $7.05^{+0.54}_{-0.57}$ au
e	$0 . 35_{- 0.17}^{+ 0.18}$ $0.35^{+0.18}_{-0.17}$
Ω	$321 . 7_{- 5.67}^{+ 5.91}^{°}$ $321.7^{+5.91}_{-5.67}{\ }^\circ {}$
ω	$359 . 00_{- 11.26}^{+ 7.87}^{°}$ $359.00^{+7.87}_{-11.26}{\ }^\circ {}$
i	31.75−38.04 °
τ₀	$2015 . 06_{- 1.14}^{+ 1.09}$ $2015.06^{+1.09}_{-1.14}$ yr

Notes. M_A (M_C): mass of the primary (close companion, resp.); q: mass ratio M_C/M_A; a: semi-major axis; e: eccentricity; Ω: longitude of the ascending node; ω: longitude of the periastron; i: inclination; τ₀: epoch of periastron. Best-fit values correspond to the maximum likelihood of the posterior distribution; standard deviations correspond to the 68.3% credible probability level from the posterior distribution. For M_A and i, only confidence intervals are given due to poor constraints from the UltraNest run. These three considerations combine with the uniform prior to produce an upper value for M_A that exceeds the initial prior range.

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