AB Aurigae

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AB Aurigae
Abaurigae hst big.jpg
AB Aurigae and its dust disk.
Observation data
Epoch J2000      Equinox J2000
Constellation Auriga
Right ascension  04h 55m 45.8445s
Declination +30° 33′ 04.292″
Apparent magnitude (V) 7.05[1]
Spectral type A0Vpe
U−B color index +0.04[2]
B−V color index +0.11[2]
Variable type Orion
Radial velocity (Rv)8.90 ± 0.9[3] km/s
Proper motion (μ) RA: 2.63[4] mas/yr
Dec.: -24.73[4] mas/yr
Parallax (π)7.18 ± 0.96[4] mas
Distanceapprox. 450 ly
(approx. 140 pc)
Mass2.4[5] M
Radius2.5[6] R
Luminosity47[5] L
Temperature9772[5] K
Other designations
BD+30° 741, HD 31293, HIP 22910, SAO 57506
Database references

AB Aurigae is a star in the Auriga constellation. It is known for hosting a dust disk that may harbour a condensing planet or brown dwarf; the star could host a possible substellar companion in wide orbit.

Planetary system[edit]

Oppenheimer et al. (2008)[7] observed an annulus feature in AB Aurigae's dust disk between 43 and 302 AU from the star, a region never seen before. An azimuthal gap in an annulus of dust at a radius of 102 AU would suggest the formation of at least one small body at an orbital distance of nearly 100 AU; such object could turn out either a massive planetary companion or more likely a brown dwarf companion, in both cases located at nearly 100 AU from the bright star. So far the object is unconfirmed.

The AB Aurigae planetary system[7]
(in order from star)
Mass Semimajor axis
Orbital period
Eccentricity Inclination Radius
b (unconfirmed) ≥5–37 MJ 102 ≥800 ?


  1. ^ Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237. Bibcode:2002yCat.2237....0D.
  2. ^ a b Nicolet, B. (1964). "Catalogue of homogeneous data in the UBV photoelectric photometric system". Astronomy and Astrophysics Supplement Series. 34: 1–49. Bibcode:1978A&AS...34....1N.
  3. ^ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065.
  4. ^ a b c van Leeuwen, F.; et al. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
  5. ^ a b c Tannirkulam, A.; Monnier, J. D.; Harries, T. J.; Millan‐Gabet, R.; Zhu, Z.; Pedretti, E.; Ireland, M.; Tuthill, P.; Ten Brummelaar, T.; McAlister, H.; Farrington, C.; Goldfinger, P. J.; Sturmann, J.; Sturmann, L.; Turner, N. (2008). "A Tale of Two Herbig Ae Stars, MWC 275 and AB Aurigae: Comprehensive Models for Spectral Energy Distribution and Interferometry". The Astrophysical Journal. 689 (1): 513–531. arXiv:0808.1728. Bibcode:2008ApJ...689..513T. doi:10.1086/592346.
  6. ^ Li, Dan; Pantin, Eric; Telesco, Charles M.; Zhang, Han; Wright, Christopher M.; Barnes, Peter J.; Packham, Chris; Mariñas, Naibí (2016). "AN ORDERED MAGNETIC FIELD IN THE PROTOPLANETARY DISK OF AB Aur REVEALED BY MID-INFRARED POLARIMETRY". The Astrophysical Journal. 832 (1): 18. arXiv:1609.02493. Bibcode:2016ApJ...832...18L. doi:10.3847/0004-637X/832/1/18.
  7. ^ a b Oppenheimer, Ben R.; et al. (2008). "The Solar-System-Scale Disk around AB Aurigae". The Astrophysical Journal. 679 (2): 1574–1581. arXiv:0803.3629. Bibcode:2008ApJ...679.1574O. doi:10.1086/587778.

Further reading[edit]

External links[edit]