Astronomy:MWC 480

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Short description: Star in the Taurus-Auriga star forming region of the constellation Auriga
MWC 480
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A visual band light curve for MWC 480, plotted from ASAS-SN data[1]
Observation data
Equinox J2000.0]] (ICRS)
Constellation Auriga[2]
Right ascension  04h 58m 46.2656s[3]
Declination +29° 50′ 36.988″[3]
Apparent magnitude (V) 7.62[4]
Characteristics
Spectral type A3psh3+[5]
Apparent magnitude (G) 7.65[3]
Astrometry
Proper motion (μ) RA: 4.661±0.051[3] mas/yr
Dec.: −25.168±0.036[3] mas/yr
Parallax (π)6.4014 ± 0.0518[3] mas
Distance510 ± 4 ly
(156 ± 1 pc)
Absolute magnitude (MV)+2.13[2]
Details
Mass1.7-2.3[6] M☉
Radius1.67[5] R☉
Luminosity11.2[5] L☉
Temperature8250[4] K
Rotational velocity (v sin i)102.0 ± 5.0[7] km/s
Age6–7.1[6] Myr
Other designations
BD+29 774, HD 31648, HIP 23143, SAO 76866, GSC 01844-00503, 2MASS J04584626+2950370[8]
Database references
SIMBADdata

MWC 480 is a single[5] star, about 510 light-years away in the constellation of Auriga.[3] It is located in the Taurus-Auriga Star-Forming Region.[9] The name refers to the Mount Wilson Catalog of B and A stars with bright hydrogen lines in their spectra.[10] With an apparent magnitude of 7.62,[4] it is too faint to be seen with the naked eye.

Properties

File:Artist impression of the protoplanetary disc surrounding the young star MWC 480.webm MWC 480 is a young Herbig Ae/Be star, a class of young stars with spectral types of A or B, but are quite young and are still not main-sequence stars. MWC 480 is about 7 million years old.[6] It is about twice the mass of the Sun,[6] and is estimated to be about 1.67 solar radii.[5]

MWC 480 has X-ray emissions typical of a pre-main-sequence Herbig Ae/Be star but with an order of magnitude more photoelectric absorption.[5] It has a gas-dust envelope and is surrounded by a protoplanetary disc that is about 11% the mass of the Sun.[6] The disc is inclined about 37° towards the line of sight, on a position angle of about 148°.[6] Astronomers using the ALMA (Atacama Large Millimeter/submillimeter Array) have found that the protoplanetary disc surrounding MWC 480 contains large amounts of methyl cyanide (CH3CN), a complex carbon-based molecule.[11] Hydrogen cyanide (HCN) has also been detected in the disc.[12] No signs of planet formation have yet been detected.

Planetary system

In 2017, it was discovered that the brown dwarf or planet designated 2MASS J04574903+3015195 may orbit the star approximately 232,000 AU away.[13] Later in 2021, an imaging of the gas flows in the circumstellar disk has suggested a presence of shrouded Jupiter-mass planet about 245 AU from the star.[14]

The MWC 480 planetary system[13][14][15]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(years) 		Eccentricity Inclination Radius
b 13 MJ 232,165 — — — 2.57 RJ
c (unconfirmed) 1 MJ 245 — — — —

References

Sky around the young star MWC 480
  1. ↑ "ASAS-SN Variable Stars Database". ASAS-SN. https://asas-sn.osu.edu/variables/lookup. 
  2. ↑ 2.0 2.1 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A  XHIP record for this object at VizieR.
  3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  4. ↑ 4.0 4.1 4.2 Mendigutía, I.; Mora, A.; Montesinos, B.; Eiroa, C.; Meeus, G.; Merín, B.; Oudmaijer, R. D. (2012). "Accretion-related properties of Herbig Ae/Be stars". Astronomy & Astrophysics 543: A59. doi:10.1051/0004-6361/201219110. 
  5. ↑ 5.0 5.1 5.2 5.3 5.4 5.5 Grady, C. A.; Hamaguchi, K.; Schneider, G.; Stecklum, B.; Woodgate, B. E.; McCleary, J. E.; Williger, G. M.; Sitko, M. L. et al. (2010). "Locating the Accretion Footprint on a Herbig Ae Star: MWC 480". The Astrophysical Journal 719 (2): 1565–1581. doi:10.1088/0004-637X/719/2/1565. Bibcode: 2010ApJ...719.1565G. https://tigerprints.clemson.edu/physastro_pubs/143. 
  6. ↑ 6.0 6.1 6.2 6.3 6.4 6.5 Loomis, Ryan A.; Öberg, Karin I.; Andrews, Sean M.; Bergin, Edwin; Bergner, Jennifer; Blake, Geoffrey A.; Cleeves, L. Ilsedore; Czekala, Ian et al. (2020). "An Unbiased ALMA Spectral Survey of the Lk Ca 15 and MWC 480 Protoplanetary Disks". The Astrophysical Journal 893 (2): 101. doi:10.3847/1538-4357/ab7cc8. Bibcode: 2020ApJ...893..101L. 
  7. ↑ Mora, A.; Merín, B.; Solano, E.; Montesinos, B.; De Winter, D.; Eiroa, C.; Ferlet, R.; Grady, C. A. et al. (2001). "EXPORT: Spectral classification and projected rotational velocities of Vega-type and pre-main sequence stars". Astronomy and Astrophysics 378: 116. doi:10.1051/0004-6361:20011098. Bibcode: 2001A&A...378..116M. 
  8. ↑ "HD 31648". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+31648. 
  9. ↑ K. L. Luhman (2010). "The Disk Population of the Taurus Star-Forming Region". The Astrophysical Journal Supplement Series 186 (1): 111–174. doi:10.1088/0067-0049/186/1/111. Bibcode: 2010ApJS..186..111L. 
  10. ↑ "Catalog of Resolved Circumstellar Disks". Circumstellardisks.org. http://www.circumstellardisks.org/show.php?id=101. 
  11. ↑ "Complex Organic Molecules Discovered in Infant Star System". Eso.org. http://www.eso.org/public/news/eso1513/. 
  12. ↑ "Complex Organic Molecules Discovered Around Star MWC 480". Science 2.0. 7 April 2015. http://www.science20.com/news_articles/complex_organic_molecules_discovered_around_star_mwc_480-154667. 
  13. ↑ 13.0 13.1 Joncour, Isabelle (2017). "Multiplicity and clustering in Taurus star-forming region. I. Unexpected ultra-wide pairs of high-order multiplicity in Taurus". NASA ADS. https://ui.adsabs.harvard.edu/abs/2017A%26A...599A..14J/abstract. Retrieved 2026-02-08. 
  14. ↑ 14.0 14.1 Teague, Richard; Bae, Jaehan; Aikawa, Yuri; Andrews, Sean M.; Bergin, Edwin A.; Bergner, Jennifer B.; Boehler, Yann; Booth, Alice S. et al. (2021), "Molecules with ALMA at Planet-forming Scales (MAPS). XVIII. Kinematic Substructures in the Disks of HD 163296 and MWC 480", The Astrophysical Journal Supplement Series 257 (1): 18, doi:10.3847/1538-4365/ac1438, Bibcode: 2021ApJS..257...18T 
  15. ↑ Zhang, Zhoujian (2018). "The Pan-STARRS1 Proper-motion Survey for Young Brown Dwarfs in Nearby Star-forming Regions. I. Taurus Discoveries and a Reddening-free Classification Method for Ultracool Dwarfs". NASA ADS. https://ui.adsabs.harvard.edu/abs/2018ApJ...858...41Z/abstract. Retrieved 2026-02-08. 



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