AA Tauri is a young variable star in the equatorial constellation of Taurus, located in the Taurus-Auriga star-forming region.

[3] The star is located approximately 439 light-years (135 parsecs) away from the Sun based on parallax, and is drifting further away with a radial velocity of +17 km/s.

[5] The stellar classification for this object is K7Ve,[4] matching a K-type main-sequence star that displays emission features.

It is theorised that the root cause of this dimness is a warp in the accretion disk, located at a distance of 7.7 AU or more from the centre, that was brought into the line of sight by its elliptical motion around the central star.

[1] In their 2003 paper, Bouvier et al. invoked the possible presence of a substellar object to explain peculiar and periodic eclipses occurring to the young star every 8.3 days, though they considered it unlikely that such a companion could be responsible for said variability.