AB Aurigae
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This article includes a list of references, related reading or external links, but its sources remain unclear because it lacks inline citations. Please improve this article by introducing more precise citations. (July 2010) |
 AB Aurigae and its dust disk. |
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| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Auriga |
| Right ascension | 04h 55m 45.8445s |
| Declination | +30° 33′ 04.292″ |
| Apparent magnitude (V) | 7.06 |
| Characteristics | |
| Spectral type | A0Vpe |
| U−B color index | 0.04 |
| B−V color index | 0.11 |
| Variable type | Orion variable |
| Astrometry | |
| Radial velocity (Rv) | 8 km/s |
| Proper motion (μ) | RA: 1.71 mas/yr Dec.: -24.24 mas/yr |
| Parallax (π) | 6.93 ± 0.95 mas |
| Distance | approx. 470 ly (approx. 140 pc) |
| Absolute magnitude (MV) | 7.18 |
| Details | |
| Mass | 3.1 M☉ |
| Radius | 2.1 R☉ |
| Luminosity | 40 L☉ |
| Temperature | 7,500–10,000 K |
| Age | 3 ± 4 million years |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Data sources: | |
| Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.) |
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AB Aurigae is a star in the Auriga constellation. It is better 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.
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[edit] A planetary system?
Oppenheimer et al. (2008)[1] 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.
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (years) |
Eccentricity |
|---|---|---|---|---|
| b (unconfirmed) | ≥5-37 MJ | 102 | ≥800 | ? |
[edit] See also
[edit] References
- ^ 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.
[edit] Further reading
- Telleschi, A.; Güdel, M.; Briggs, K. R.; Skinner, S. L.; Audard, M.; Franciosini, E. (2007). "The first high-resolution X-ray spectrum of a Herbig star: AB Aurigae". The Astrophysical Journal 468 (2): 541–556. arXiv:astro-ph/0610456. Bibcode 2007A&A...468..541T. doi:10.1051/0004-6361:20065422.
- Oppenheimer, Ben R.; Brenner, Douglas; Hinkley, Sasha; Zimmerman, Neil; Sivaramakrishnan, Anand; Soummer, Remi; Kuhn, Jeffrey; Graham, James R.; Perrin, Marshall; Lloyd, James P.; Roberts, Lewis C., Jr.; Harrington, David M. (2008). "The Solar-System-Scale Disk around AB Aurigae". The Astrophysical Journal 679 (2): 1574–1581. Bibcode 2008ApJ...679.1574O. doi:10.1086/587778. http://adsabs.harvard.edu/cgi-bin/bib_query?arXiv:0803.3629.
- Bitner, Martin A.; Richter, Matthew J.; Lacy, John H.; Greathouse, Thomas K.; Jaffe, Daniel T.; Blake, Geoffrey A. (2007). "TEXES Observations of Pure Rotational H2 Emission from AB Aurigae". The Astrophysical Journal 661 (1): L69–L72. Bibcode 2007ApJ...661L..69B. doi:10.1086/518717.
- Fukagawa, Misato; Hayashi, Masahiko; Tamura, Motohide; Itoh, Yoichi; Hayashi, Saeko S.; Oasa, Yumiko; Takeuchi, Taku; Morino, Jun-ichi; Murakawa, Koji; Oya, Shin; Yamashita, Takuya; Suto, Hiroshi; Mayama, Satoshi; Naoi, Takahiro; Ishii, Miki; Pyo, Tae-Soo; Nishikawa, Takayuki; Takato, Naruhisa; Usuda, Tomonori; Ando, Hiroyasu; Iye, Masanori; Miyama, Shoken M.; Kaifu, Norio (2004). "Spiral Structure in the Circumstellar Disk around AB Aurigae". The Astrophysical Journal 605 (1): L53–L56. Bibcode 2004ApJ...605L..53F. doi:10.1086/420699.
- L. P. Keller1, S. Hony, J. P. Bradley, F. J. Molster, L. B. F. M. Waters, J. Bouwman, A. de Koter, D. E. Brownlee, G. J. Flynn, T. Henning & H. Mutschke (2002). "Identification of iron sulphide grains in protoplanetary disks". Nature 417 (6885): 148–150. doi:10.1038/417148a. PMID 12000914. http://www.nature.com/nature/journal/v417/n6885/full/417148a.html.
- Overbye, Dennis (2008-03-26). "Star’s Dust May Hold Clue to New Planet". www.nytimes.com. http://www.nytimes.com/2008/03/26/science/space/26planet.html. Retrieved 2008-08-20.
- "Image AB Aurigae". SIMBAD. http://aladin.u-strasbg.fr/AladinPreview?-c=04+55+45.8445%2B30+33+04.292&ident=V*+AB+Aur&submit=Aladin+previewer. Retrieved 2008-08-20.
- "AB Aurigae: How To Make Planets". NASA. http://apod.nasa.gov/apod/ap030208.html. Retrieved 2008-08-20.
- "AB Aurigae". http://jumk.de. http://jumk.de/astronomie/exoplanets/ab-aurigae.shtml. Retrieved 2008-10-15.
- "Planet in Progress? Evidence Of A Huge Planet Forming In Star System". Science News. http://www.sciencedaily.com/releases/2008/03/080326123135.htm. Retrieved 2008-10-15.
- "Spiral Dance in a Planetary Nursery". Subaru Telescope. http://subarutelescope.org/Pressrelease/2004/04/18/index.html. Retrieved 2008-10-15.
- "The Source of Stelar Magnetism". http://news.softpedia.com. http://news.softpedia.com/news/The-Source-of-Stelar-Magnetism-48006.shtml. Retrieved 2008-10-16.
- "XMM-Newton unlocks magnetic mystery". iTWire. http://www.itwire.com/content/view/9860/1066/. Retrieved 2008-10-16.
- "Silicate Stardust in Meteorites". Planetary science research. http://www.psrd.hawaii.edu/June04/silicatesMeteorites.html. Retrieved 2008-10-16.
- "Image Multimidea Gallary ESA". ESA. http://www.esa.int/esa-mmg/mmg.pl?b=b&type=I&mission=XMM-Newton&single=y&start=23. Retrieved 2008-10-16.
[edit] External links
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