MWC 480 is a single[3] star, about 500 light-years away in the constellation of Auriga. It is located in the Taurus-Auriga Star-Forming Region.[7] The name refers to the Mount Wilson Catalog of B and A stars with bright hydrogen lines in their spectra.[8] With an apparent magnitude of 7.62,[2] it is too faint to be seen with the naked eye.
Star in the Taurus-Auriga star forming region of the constellation Auriga
Artist impression of the protoplanetary disc surrounding MWC 480.
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.[4] It is about twice the mass of the Sun,[4] and is estimated to be about 1.67 solar radii.[3]
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.[3] It has a gas-dust envelope and is surrounded by a protoplanetary disc that is about 11% the mass of the Sun.[4] The disc is inclined about 37° towards the line of sight, on a position angle of about 148°.[4] 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.[9] Hydrogen cyanide (HCN) has also been detected in the disc.[10] No signs of planet formation have yet been detected.
Planetary system
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.[11]
Grady, C. A.; Hamaguchi, K.; Schneider, G.; Stecklum, B.; Woodgate, B. E.; McCleary, J. E.; Williger, G. M.; Sitko, M. L.; Ménard, F.; Henning, Th.; Brittain, S.; Troutmann, M.; Donehew, B.; Hines, D.; Wisniewski, J. P.; Lynch, D. K.; Russell, R. W.; Rudy, R. J.; Day, A. N.; Shenoy, A.; Wilner, D.; Silverstone, M.; Bouret, J.-C.; Meusinger, H.; Clampin, M.; Kim, S.; Petre, R.; Sahu, M.; Endres, M.; Collins, K. A. (2010). "Locating the Accretion Footprint on a Herbig Ae Star: MWC 480". The Astrophysical Journal. 719 (2): 1565–1581. Bibcode:2010ApJ...719.1565G. doi:10.1088/0004-637X/719/2/1565.
Loomis, Ryan A.; Öberg, Karin I.; Andrews, Sean M.; Bergin, Edwin; Bergner, Jennifer; Blake, Geoffrey A.; Cleeves, L. Ilsedore; Czekala, Ian; Huang, Jane; Le Gal, Romane; Ménard, Francois; Pegues, Jamila; Qi, Chunhua; Walsh, Catherine; Williams, Jonathan P.; Wilner, David J. (2020). "An Unbiased ALMA Spectral Survey of the Lk Ca 15 and MWC 480 Protoplanetary Disks". The Astrophysical Journal. 893 (2): 101. arXiv:2006.16187. Bibcode:2020ApJ...893..101L. doi:10.3847/1538-4357/ab7cc8. S2CID219077531.
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