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AIMS: Using Wide-field Infrared Survey Explorer (WISE) data and previousoptical and near-infrared sky surveys, we try to identify still missing stellarand substellar neighbours of the Sun. METHODS: When checking the brightest redWISE sources for proper motions and colours expected for nearby M and L dwarfswe also approached the thin Galactic plane. Astrometry (proper motion andparallax measurements) and the available photometry were used to give firstestimates of the distance and type of nearby candidates. RESULTS: We havediscovered WISE J072003.20$-$084651.2, an object with moderately high propermotion ($\mu$$\approx$120 mas/yr) and at low Galactic latitude($b$$=$$+$2.3$\degr$), with similar brightness ($J$$\approx$10.6,$w2$$\approx$8.9) and colours ($I$$-$$J$$\approx$3.2, $J$$-$$K_s$$\approx$1.2,$w1$$-$$w2$$\approx$0.3) as the nearest known M-type brown dwarf LP 944-20.With a photometric classification as an M9$\pm$1 dwarf, its photometricdistance lies in the range between about 5 and 7 pc, based on comparison withabsolute magnitudes of LP 944-20 alone or of a sample of M8-L0 dwarfs.Theslightly larger distance derived from our preliminary trigonometric parallax(7.0$\pm$1.9 pc) may indicate a close binary nature. The new neighbour is anexcellent target for planet search and low-mass star/brown dwarf studies.

Neighbours hiding in the Galactic plane - a new M/L dwarf candidate for the 8pc sample