MINDS: Complementary inclinations in the binary system HK Tau reveal gas- and ice-phase chemistry

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Volume 711 (July 2026)

A&A, 711 (2026) A276

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Table 1

Properties of the HK Tau system.

Entire system
Parameter	Value	References
Separation	2.34″, ~300 au	(1)
Distance	128 ± 4 pc	(2), (3)

Single components
Parameter	A	B	References
Inclination	${56.9}_{- 0.5}^{\circ + 0.5}$ $Mathematical equation: $\[56.9_{~~-0.5}^{\circ+0.5}\]$$	${83.2}_{- 0.2}^{\circ + 0.2}$ $Mathematical equation: $\[83.2_{~~-0.2}^{\circ+0.2}\]$$	(4)
Position angle	175°	41°	(5), (6)
Stellar mass	${0.44}_{- 0.11}^{+ 0.14}$ $Mathematical equation: $\[0.44_{-0.11}^{+0.14}\]$$	${0.37}_{- 0.2}^{+ 0.2}$ $Mathematical equation: $\[0.37_{-0.2}^{+0.2}\]$$ M_⊙	(4)
Spectral type	M1	M2	(7)
Stellar luminosity	${0.55}_{- 0.15}^{+ 0.15}$ $Mathematical equation: $\[0.55_{-0.15}^{+0.15}\]$$	≥ ${0.03}_{- 0.01}^{+ 0.01}$ $Mathematical equation: $\[0.03_{-0.01}^{+0.01}\]$$ L_⊙	(8)
Stellar radius × sin(i)	${1.40}_{- 0.1}^{+ 0.1}$ $Mathematical equation: $\[1.40_{-0.1}^{+0.1}\]$$ R_⊙	−	(9)
Systemic velocity	${5.98}_{- 0.51}^{+ 0.09}$ $Mathematical equation: $\[5.98_{-0.51}^{+0.09}\]$$	${6.05}_{- 0.37}^{+ 0.7}$ $Mathematical equation: $\[6.05_{-0.37}^{+0.7}\]$$ km/s	(10)

Notes. (1) White & Ghez (2001), (2) Gaia Collaboration (2021), (3) Luhman (2023); the distance is estimated from the primary, (4) Manara et al. (2019), (5) Leinert et al. (1993), (6) Villenave et al. (2020), (7) Monin et al. (1998), (8) Simon et al. (2019); the luminosity of B is likely underestimated because of its inclination, (9) Nofi et al. (2021), (10) Braun et al. (2021); the systemic velocity is measured from ALMA data in kinematic local standard of rest reference.

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