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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.

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]
Characteristics
Spectral type A0Vpe
U−B color index +0.04[2]
B−V color index +0.11[2]
Variable type Orion
Astrometry
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)
Details
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
SIMBADdata

Contents

Planetary systemEdit

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]
Companion
(in order from star)
Mass Semimajor axis
(AU)
Orbital period
(years)
Eccentricity Inclination Radius
b (unconfirmed) ≥5–37 MJ 102 ≥800 ?


ReferencesEdit

  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 readingEdit

External linksEdit