AA Tauri

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AA Tauri
AA Tauri star and planet.png

Artist's impresion of AA Tauri and possible substellar companion
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Taurus
Right ascension 04h 34m 55.42s
Declination +24° 28′ 53.2″
Apparent magnitude (V) 12.82
Spectral type K7V
Variable type T Tauri-type?
Distance ≈456.4 ly
(≈140 pc)
Mass 0.76[1] M
Radius 1.81[1] R
Luminosity 0.8[1] L
Temperature 4060[1] K
Age 2.4[1] million years
Other designations
V* AA Tau, GCRV 55202, Kim 2-79, XEST 25-026, AN 196.1930, GSC 01833-00851, 2MASS J04345542+2428531, [ABG2007] 1651, CSI+24-04319, HBC 63, MHA 259-17, [FK83] LDN 1529 44, 2E 0431.8+2422, IRAS 04318+2422, UBV 4396, [GBA2007] 1766, 2E 1098 IRAS F04318+2422, XEST 25-OM-003

AA Tauri is a young star in the constellation of Taurus, located in the young Taurus-Auriga Star Forming Region, roughly at 460 light years away from the Sun.

A possible planetary system[edit]

In their paper of 2003, Grinin et al. invoke the possible presence of a substellar object to explain peculiar and periodic eclipses occurring to the young star every 8.3 days.[2] They infer a mass of 20 times that of Jupiter for the perturbing object and an orbital separation of 0.08 Astronomical Units.

The AA Tauri planetary system
(in order from star)
Mass Semimajor axis
Orbital period
Eccentricity Inclination Radius
b (unconfirmed) ≤20 MJ 0.08 8.5 0


  1. ^ a b c d e Güdel; et al. (2007). "The XMM-Newton Extended Survey of the Taurus Molecular Cloud (XEST)". Astronomy and Astrophysics 468 (2): 353–377. arXiv:astro-ph/0609160. Bibcode:2007A&A...468..353G. doi:10.1051/0004-6361:20065724. 
  2. ^ Bouvier; et al. (2003). "Eclipses by circumstellar material in the T Tauri star AA Tau. II. Evidence for non-stationary magnetospheric accretion". Astronomy and Astrophysics 409: 169–192. arXiv:astro-ph/0306551. Bibcode:2003A&A...409..169B. doi:10.1051/0004-6361:20030938.