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AB Aurigae

April 13, 2024

AB Aurigae is a young Herbig Ae star[3] in the Auriga constellation. It is located at a distance of approximately 531 light years from the Sun based on stellar parallax.[1] This pre-main-sequence star has a stellar classification of A0Ve,[4] matching an A-type main-sequence star with emission lines in the spectrum. It has 2.4 times the mass of the Sun and is radiating 38[8] times the Sun's luminosity from its photosphere at an effective temperature of 9,772 K.[10] The radio emission from the system suggests the presence of a thermal jet originating from the star with a velocity of 300 km s−1. This is causing an estimated mass loss of 1.7×10−8 M☉ yr−1.[8]

AB Aurigae

ALMA image of the dust ring (red) and gaseous spirals (blue) of the circumstellar disk AB Aurigae reveal gaseous spiral arms inside a wide dust gap, providing a hint of planet formation.
Credit: ALMA (ESO/NAOJ/NRAO)/Tang et al.
Observation data
Epoch J2000      Equinox J2000
Constellation Auriga
Right ascension 04h 55m 45.84600s[1]
Declination +30° 33′ 04.2933″[1]
Apparent magnitude (V) 7.05[2]
Characteristics
Evolutionary stage Pre-main-sequence[3]
Spectral type A0Ve[4]
U−B color index +0.04[5]
B−V color index +0.11[5]
Variable type INA (Herbig Ae)[3][6]
Astrometry
Radial velocity (Rv)+8.9±0.9[7] km/s
Proper motion (μ) RA: +3.926[1] mas/yr
Dec.: –24.112[1] mas/yr
Parallax (π)6.1400 ± 0.0571 mas[1]
Distance531 ± 5 ly
(163 ± 2 pc)
Details
Mass2.4±0.2[8] M☉
Radius2.5[9] R☉
Luminosity~38[8] L☉
Temperature9,772[10] K
Age4±1[8] Myr
Other designations
AB Aur, BD+30° 741, HD 31293, HIP 22910, SAO 57506[11]
Database references
SIMBADdata

This star 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. The star is part of the young Taurus-Auriga association,[4] which is located in the Taurus Molecular Cloud.[12] The star itself may recently have encountered a dense cloudlet, which disrupted its debris disk and produced an additional reflection nebula.[13]

Planetary system edit

In 2017 scientists used the Atacama Large Millimeter/submillimeter Array (ALMA) to take an image of the protoplanetary disk around AB Aurigae. The image showed a dusty disk which has a radius of about 120 astronomical units and a distinct "gap". Inside this gap gaseous spiral arms are detected in CO.[14][3]

Oppenheimer et al. (2008)[15] 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 an object could turn out to be 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.

Observations with ALMA found two gaseous spiral arms inside the disk. These are best explained by an unseen planet with a semimajor axis of about 60–80 au. An additional planet with a semimajor axis of 30 au and with a large pitch angle compared to the disk (likely higher inclination) could explain the emptiness of the inner dusty disk.[3] The outer planet was still not detected as in 2022, putting an upper limit on is mass at 3–4 MJ, inconsistent with the spiral structures observed in the disk.[16] The planet-like clump observed in April 2022 at projected separation 93 AU from star, may be either an accretion disk around newly formed planet or the unstable disk region currently transforming into the planet.[17] The planet observation was confirmed in July 2022.[18]

The AB Aurigae planetary system[15]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(years) 		Eccentricity Inclination Radius
protoplanetary disk 43–430[13] AU — —
b[17] 9–12[17] MJ 93[17] ? 0.19–0.60 27.1–58.2° 2.75 RJ

Gallery edit

References edit

  1. ^ a b c d e f Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. ^ 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.
  3. ^ a b c d e Tang, Ya-Wen; et al. (May 2017). "Planet Formation in AB Aurigae: Imaging of the Inner Gaseous Spirals Observed inside the Dust Cavity". The Astrophysical Journal. 840 (1): 32. arXiv:1704.02699. Bibcode:2017ApJ...840...32T. doi:10.3847/1538-4357/aa6af7. ISSN 0004-637X. S2CID 119351517.
  4. ^ a b c Mooley, Kunal; et al. (July 2013). "B- and A-type Stars in the Taurus-Auriga Star-forming Region". The Astrophysical Journal. 771 (2): 24. arXiv:1306.0598. Bibcode:2013ApJ...771..110M. doi:10.1088/0004-637X/771/2/110. S2CID 2176170. 110.
  5. ^ 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.
  6. ^ Samus', N. N.; et al. (January 2017). "General catalogue of variable stars: Version GCVS 5.1". Astronomy Reports. 61 (1): 80–88. Bibcode:2017ARep...61...80S. doi:10.1134/S1063772917010085. ISSN 1063-7729. S2CID 125853869.
  7. ^ 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. S2CID 119231169.
  8. ^ a b c d e Rodríguez, Luis F.; et al. (September 2014). "An Ionized Outflow from AB Aur, a Herbig Ae Star with a Transitional Disk". The Astrophysical Journal Letters. 793 (1): 4. arXiv:1408.7068. Bibcode:2014ApJ...793L..21R. doi:10.1088/2041-8205/793/1/L21. S2CID 118640915. L21.
  9. ^ Li, Dan; et al. (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. S2CID 118475064.
  10. ^ a b Tannirkulam, A.; et al. (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. S2CID 45548.
  11. ^ "AB Aur". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-03-05.
  12. ^ Gagné, Jonathan; et al. (March 2018). "BANYAN. XI. The BANYAN Σ Multivariate Bayesian Algorithm to Identify Members of Young Associations with 150 pc". Astrophysical Journal. 856 (1): 23. arXiv:1801.09051. Bibcode:2018ApJ...856...23G. doi:10.3847/1538-4357/aaae09. ISSN 0004-637X. S2CID 119185386.
  13. ^ a b Kuffmeier, M.; Goicovic, F. G.; Dullemond, C. P. (2020), "Late encounter events as source of disks and spiral structures", Astronomy & Astrophysics, 633: A3, arXiv:1911.04833, doi:10.1051/0004-6361/201936820, S2CID 207863630
  14. ^ . ALMA. Archived from the original on 2020-05-28. Retrieved 2020-02-22.
  15. ^ 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. S2CID 17424945.
  16. ^ Jorquera, Sebastián; et al. (2022), "Large Binocular Telescope Search for Companions and Substructures in the (Pre)transitional Disk of AB Aurigae", The Astrophysical Journal, 926 (1): 71, arXiv:2201.08867, Bibcode:2022ApJ...926...71J, doi:10.3847/1538-4357/ac4be4, S2CID 246240894
  17. ^ a b c d Currie, Thayne; et al. (4 April 2022). "Images of embedded Jovian planet formation at a wide separation around AB Aurigae". Nature Astronomy. 6 (6). Springer Science and Business Media LLC: 751–759. arXiv:2204.00633. Bibcode:2022NatAs...6..751C. doi:10.1038/s41550-022-01634-x. ISSN 2397-3366. S2CID 247940163.
  18. ^ Zhou, Yifan; Sanghi, Aniket; Bowler, Brendan P.; Wu, Ya-Lin; Close, Laird M.; Long, Feng; Ward-Duong, Kimberly; Zhu, Zhaohuan; Kraus, Adam L.; Follette, Katherine B.; Bae, Jaehan (2022), "HST/WFC3 Hα Direct-imaging Detection of a Pointlike Source in the Disk Cavity of AB Aur", The Astrophysical Journal Letters, 934 (1): L13, arXiv:2207.06525, Bibcode:2022ApJ...934L..13Z, doi:10.3847/2041-8213/ac7fef, S2CID 251064702
  19. ^ Cody, Ann Marie; Tayar, Jamie; Hillenbrand, Lynne A.; Matthews, Jaymie M.; Kallinger, Thomas (March 2013). "Precise High-cadence Time Series Observations of Five Variable Young Stars in Auriga with MOST". The Astronomical Journal. 145 (3): 79. arXiv:1302.0018. Bibcode:2013AJ....145...79C. doi:10.1088/0004-6256/145/3/79. S2CID 1261183. Retrieved 29 October 2021.

Further reading edit

  • Telleschi, A.; et al. (2007). "The first high-resolution X-ray spectrum of a Herbig star: AB Aurigae". Astronomy and Astrophysics. 468 (2): 541–556. arXiv:astro-ph/0610456. Bibcode:2007A&A...468..541T. doi:10.1051/0004-6361:20065422. S2CID 14242067.
  • Bitner, Martin A.; et al. (2007). "TEXES Observations of Pure Rotational H2 Emission from AB Aurigae". The Astrophysical Journal. 661 (1): L69–L72. arXiv:0704.1481. Bibcode:2007ApJ...661L..69B. doi:10.1086/518717. S2CID 14473137.
  • Fukagawa, Misato; et al. (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. S2CID 123196140.
  • Keller, L. P.; et al. (2002). "Identification of iron sulphide grains in protoplanetary disks". Nature. 417 (6885): 148–150. Bibcode:2002Natur.417..148K. doi:10.1038/417148a. PMID 12000914. S2CID 4420339.

External links edit

  • Overbye, Dennis (26 March 2008). "Star's Dust May Hold Clue to New Planet". New York Times. Retrieved 2021-03-06.
  • Image AB Aurigae
  • "Image AB Aurigae". SIMBAD. Retrieved 2008-08-20.
  • "AB Aurigae". jumk.de. Retrieved 2008-10-15.
  • "Spiral Dance in a Planetary Nursery". Subaru Telescope. Retrieved 2008-10-15.
  • "The Source of Stellar Magnetism". news.softpedia.com. 26 February 2007. Retrieved 2008-10-16.
  • "XMM-Newton unlocks magnetic mystery". iTWire. Retrieved 2008-10-16.
  • "Silicate Stardust in Meteorites". Planetary science research. Retrieved 2008-10-16.
  • "Image Multimedia Gallery ESA". ESA. Retrieved 2008-10-16.
  • "ESO Telescope Sees Signs of Planet Birth". European Southern Observatory. Retrieved 2021-03-06.

Archived:

  • Overbye, Dennis (2008-03-26). "Star's Dust May Hold Clue to New Planet". www.nytimes.com. from the original on December 10, 2008. Retrieved 2008-08-20.
  • "AB Aurigae: How To Make Planets". NASA. from the original on 29 September 2008. Retrieved 2008-08-20.
  • "Planet in Progress? Evidence Of A Huge Planet Forming In Star System". Science News. from the original on 10 October 2008. Retrieved 2008-10-15.

April 13, 2024
aurigae, young, herbig, star, auriga, constellation, located, distance, approximately, light, years, from, based, stellar, parallax, this, main, sequence, star, stellar, classification, a0ve, matching, type, main, sequence, star, with, emission, lines, spectru. AB Aurigae is a young Herbig Ae star 3 in the Auriga constellation It is located at a distance of approximately 531 light years from the Sun based on stellar parallax 1 This pre main sequence star has a stellar classification of A0Ve 4 matching an A type main sequence star with emission lines in the spectrum It has 2 4 times the mass of the Sun and is radiating 38 8 times the Sun s luminosity from its photosphere at an effective temperature of 9 772 K 10 The radio emission from the system suggests the presence of a thermal jet originating from the star with a velocity of 300 km s 1 This is causing an estimated mass loss of 1 7 10 8 M yr 1 8 AB AurigaeALMA image of the dust ring red and gaseous spirals blue of the circumstellar disk AB Aurigae reveal gaseous spiral arms inside a wide dust gap providing a hint of planet formation Credit ALMA ESO NAOJ NRAO Tang et al Observation dataEpoch J2000 Equinox J2000Constellation AurigaRight ascension 04h 55m 45 84600s 1 Declination 30 33 04 2933 1 Apparent magnitude V 7 05 2 CharacteristicsEvolutionary stage Pre main sequence 3 Spectral type A0Ve 4 U B color index 0 04 5 B V color index 0 11 5 Variable type INA Herbig Ae 3 6 AstrometryRadial velocity Rv 8 9 0 9 7 km sProper motion m RA 3 926 1 mas yr Dec 24 112 1 mas yrParallax p 6 1400 0 0571 mas 1 Distance531 5 ly 163 2 pc DetailsMass2 4 0 2 8 M Radius2 5 9 R Luminosity 38 8 L Temperature9 772 10 KAge4 1 8 MyrOther designationsAB Aur BD 30 741 HD 31293 HIP 22910 SAO 57506 11 Database referencesSIMBADdataThis star 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 The star is part of the young Taurus Auriga association 4 which is located in the Taurus Molecular Cloud 12 The star itself may recently have encountered a dense cloudlet which disrupted its debris disk and produced an additional reflection nebula 13 Contents 1 Planetary system 2 Gallery 3 References 4 Further reading 5 External linksPlanetary system editIn 2017 scientists used the Atacama Large Millimeter submillimeter Array ALMA to take an image of the protoplanetary disk around AB Aurigae The image showed a dusty disk which has a radius of about 120 astronomical units and a distinct gap Inside this gap gaseous spiral arms are detected in CO 14 3 Oppenheimer et al 2008 15 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 an object could turn out to be 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 Observations with ALMA found two gaseous spiral arms inside the disk These are best explained by an unseen planet with a semimajor axis of about 60 80 au An additional planet with a semimajor axis of 30 au and with a large pitch angle compared to the disk likely higher inclination could explain the emptiness of the inner dusty disk 3 The outer planet was still not detected as in 2022 putting an upper limit on is mass at 3 4 MJ inconsistent with the spiral structures observed in the disk 16 The planet like clump observed in April 2022 at projected separation 93 AU from star may be either an accretion disk around newly formed planet or the unstable disk region currently transforming into the planet 17 The planet observation was confirmed in July 2022 18 The AB Aurigae planetary system 15 Companion in order from star Mass Semimajor axis AU Orbital period years Eccentricity Inclination Radiusprotoplanetary disk 43 430 13 AU b 17 9 12 17 M J 93 17 0 19 0 60 27 1 58 2 2 75 R JGallery edit nbsp AB Aurigae and its dust disk seen by Hubble nbsp A light curve for AB Aurigae from MOST satellite data adapted from Cody et al 2013 19 nbsp Hubble Space Telescope images of protoplanet AB Aurigae b References edit a b c d e f Brown A G A et al Gaia collaboration August 2018 Gaia Data Release 2 Summary of the contents and survey properties Astronomy amp Astrophysics 616 A1 arXiv 1804 09365 Bibcode 2018A amp A 616A 1G doi 10 1051 0004 6361 201833051 Gaia DR2 record for this source at VizieR 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 a b c d e Tang Ya Wen et al May 2017 Planet Formation in AB Aurigae Imaging of the Inner Gaseous Spirals Observed inside the Dust Cavity The Astrophysical Journal 840 1 32 arXiv 1704 02699 Bibcode 2017ApJ 840 32T doi 10 3847 1538 4357 aa6af7 ISSN 0004 637X S2CID 119351517 a b c Mooley Kunal et al July 2013 B and A type Stars in the Taurus Auriga Star forming Region The Astrophysical Journal 771 2 24 arXiv 1306 0598 Bibcode 2013ApJ 771 110M doi 10 1088 0004 637X 771 2 110 S2CID 2176170 110 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 amp AS 34 1N Samus N N et al January 2017 General catalogue of variable stars Version GCVS 5 1 Astronomy Reports 61 1 80 88 Bibcode 2017ARep 61 80S doi 10 1134 S1063772917010085 ISSN 1063 7729 S2CID 125853869 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 S2CID 119231169 a b c d e Rodriguez Luis F et al September 2014 An Ionized Outflow from AB Aur a Herbig Ae Star with a Transitional Disk The Astrophysical Journal Letters 793 1 4 arXiv 1408 7068 Bibcode 2014ApJ 793L 21R doi 10 1088 2041 8205 793 1 L21 S2CID 118640915 L21 Li Dan et al 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 S2CID 118475064 a b Tannirkulam A et al 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 S2CID 45548 AB Aur SIMBAD Centre de donnees astronomiques de Strasbourg Retrieved 2021 03 05 Gagne Jonathan et al March 2018 BANYAN XI The BANYAN S Multivariate Bayesian Algorithm to Identify Members of Young Associations with 150 pc Astrophysical Journal 856 1 23 arXiv 1801 09051 Bibcode 2018ApJ 856 23G doi 10 3847 1538 4357 aaae09 ISSN 0004 637X S2CID 119185386 a b Kuffmeier M Goicovic F G Dullemond C P 2020 Late encounter events as source of disks and spiral structures Astronomy amp Astrophysics 633 A3 arXiv 1911 04833 doi 10 1051 0004 6361 201936820 S2CID 207863630 Astronomers Found Spirals Inside a Dust Gap of a Young Star Forming Disk ALMA Archived from the original on 2020 05 28 Retrieved 2020 02 22 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 S2CID 17424945 Jorquera Sebastian et al 2022 Large Binocular Telescope Search for Companions and Substructures in the Pre transitional Disk of AB Aurigae The Astrophysical Journal 926 1 71 arXiv 2201 08867 Bibcode 2022ApJ 926 71J doi 10 3847 1538 4357 ac4be4 S2CID 246240894 a b c d Currie Thayne et al 4 April 2022 Images of embedded Jovian planet formation at a wide separation around AB Aurigae Nature Astronomy 6 6 Springer Science and Business Media LLC 751 759 arXiv 2204 00633 Bibcode 2022NatAs 6 751C doi 10 1038 s41550 022 01634 x ISSN 2397 3366 S2CID 247940163 Zhou Yifan Sanghi Aniket Bowler Brendan P Wu Ya Lin Close Laird M Long Feng Ward Duong Kimberly Zhu Zhaohuan Kraus Adam L Follette Katherine B Bae Jaehan 2022 HST WFC3 Ha Direct imaging Detection of a Pointlike Source in the Disk Cavity of AB Aur The Astrophysical Journal Letters 934 1 L13 arXiv 2207 06525 Bibcode 2022ApJ 934L 13Z doi 10 3847 2041 8213 ac7fef S2CID 251064702 Cody Ann Marie Tayar Jamie Hillenbrand Lynne A Matthews Jaymie M Kallinger Thomas March 2013 Precise High cadence Time Series Observations of Five Variable Young Stars in Auriga with MOST The Astronomical Journal 145 3 79 arXiv 1302 0018 Bibcode 2013AJ 145 79C doi 10 1088 0004 6256 145 3 79 S2CID 1261183 Retrieved 29 October 2021 Further reading editTelleschi A et al 2007 The first high resolution X ray spectrum of a Herbig star AB Aurigae Astronomy and Astrophysics 468 2 541 556 arXiv astro ph 0610456 Bibcode 2007A amp A 468 541T doi 10 1051 0004 6361 20065422 S2CID 14242067 Bitner Martin A et al 2007 TEXES Observations of Pure Rotational H2 Emission from AB Aurigae The Astrophysical Journal 661 1 L69 L72 arXiv 0704 1481 Bibcode 2007ApJ 661L 69B doi 10 1086 518717 S2CID 14473137 Fukagawa Misato et al 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 S2CID 123196140 Keller L P et al 2002 Identification of iron sulphide grains in protoplanetary disks Nature 417 6885 148 150 Bibcode 2002Natur 417 148K doi 10 1038 417148a PMID 12000914 S2CID 4420339 External links editOverbye Dennis 26 March 2008 Star s Dust May Hold Clue to New Planet New York Times Retrieved 2021 03 06 Image AB Aurigae Image AB Aurigae SIMBAD Retrieved 2008 08 20 AB Aurigae jumk de Retrieved 2008 10 15 Spiral Dance in a Planetary Nursery Subaru Telescope Retrieved 2008 10 15 The Source of Stellar Magnetism news softpedia com 26 February 2007 Retrieved 2008 10 16 XMM Newton unlocks magnetic mystery iTWire Retrieved 2008 10 16 Silicate Stardust in Meteorites Planetary science research Retrieved 2008 10 16 Image Multimedia Gallery ESA ESA Retrieved 2008 10 16 ESO Telescope Sees Signs of Planet Birth European Southern Observatory Retrieved 2021 03 06 Archived Overbye Dennis 2008 03 26 Star s Dust May Hold Clue to New Planet www nytimes com Archived from the original on December 10 2008 Retrieved 2008 08 20 AB Aurigae How To Make Planets NASA Archived from the original on 29 September 2008 Retrieved 2008 08 20 Planet in Progress Evidence Of A Huge Planet Forming In Star System Science News Archived from the original on 10 October 2008 Retrieved 2008 10 15 Retrieved from https en wikipedia org w index php title AB Aurigae amp oldid 1187160968, wikipedia, wiki, book, books, library,

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