T CrA has a companion - First direct detection of T CrA B with VLTI/MATISSE

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Table 1.

Overview of the fitted parameters from our modeling. The parameters on the position of the companion are reported separately in Table 2.

	Unit	Stage 1	Stage 2

Central source
FWHM (L band)	mas au	2.8 0.4	$2 . 1_{- 0.7}^{+ 0.5}$ $2.1^{+0.5}_{-0.7}$ $0 . 3_{- 0.1}^{+ 0.1}$ $0.3^{+0.1}_{-0.1}$
FWHM (11μm)	mas au		$12 . 8_{- 0.9}^{+ 1.1}$ $12.8^{+1.1}_{-0.9}$ $1 . 9_{- 0.1}^{+ 0.2}$ $1.9^{+0.2}_{-0.1}$
cos i		0.64
θ ^(a)	°	6
F_ν (3.5 μm)	Jy	2.3	$1 . 8_{- 0.4}^{+ 0.3}$ $1.8^{+0.3}_{-0.4}$
F_ν (11 μm)	Jy		$3 . 1_{- 0.2}^{+ 0.4}$ $3.1^{+0.4}_{-0.2}$

Companion

FWHM (L band)	mas au	9.1 1.4	$6 . 2_{- 0.8}^{+ 0.6}$ $6.2^{+0.6}_{-0.8}$ $0 . 9_{- 0.1}^{+ 0.1}$ $0.9^{+0.1}_{-0.1}$
FWHM (11 μm)	mas au		$19 . 0_{- 1.8}^{+ 2.6}$ $19.0^{+2.6}_{-1.8}$ $2 . 8_{- 0.3}^{+ 0.4}$ $2.8^{+0.4}_{-0.3}$
cos i		0.64
θ	°	138
F_ν (3.5 μm)	Jy	0.4	$0 . 22_{- 0.06}^{+ 0.08}$ $0.22^{+0.08}_{-0.06}$
F_ν (11 μm)	Jy		$0 . 6_{- 0.1}^{+ 0.1}$ $0.6^{+0.1}_{-0.1}$

Background

F_ν (3.5 μm)	Jy	0.001	$0 . 6_{- 0.5}^{+ 0.5}$ $0.6^{+0.5}_{-0.5}$
F_ν (11 μm)	Jy		$1 . 8_{- 0.4}^{+ 0.4}$ $1.8^{+0.4}_{-0.4}$

χ_red² (L band)		714.5
χ_red² (N band)			23.8 – 59.3 ^(b)

Notes.

^(a)

This parameter was kept fixed during the fitting.

^(b)

The range of χ_red² values corresponding to the separate per-exposure fits is indicated here.

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