Oph-IRS 48

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Oph-IRS 48
Artist’s impression of the comet factory seen by ALMA.jpg
Artist's impression of Oph-IRS 48's dust disk
Observation data
Epoch J2000      Equinox J2000
Constellation Ursa Major
Right ascension 16h 27m 37.18s[1]
Declination −24° 30′ 35.3″[1]
Apparent magnitude (V) 14.80[2]
Spectral type A0[1]
Distance390 ly
(120[1] pc)
Luminosity14.3 L
Other designations
IRAS 16245-2423, 2MASS J16273718-2430350
Database references

Oph-IRS 48 is a star surrounded by an extraordinary protoplanetary disk, 390 to 400 light years from Earth in the constellation of Ophiuchus.[3] The disk has revolutionized the view of planet formation in astronomy. Studies have shown that the millimeter dust particles are gathered in a crescent shape, while the gas (traced by CO molecules) and small dust grains follow a full disk ring structure .[4][5][6] The centimeter grains are even more concentrated inside the crescent.[7] This structure is consistent with theoretical predictions of dust trapping. Also the chemical composition has been studied, with molecules like H2CO being present.[8] The dust trap is thought to be conducting the process of planet formation in this young system.


  1. ^ a b c d e Bruderer, Simon; et al. (2014). "Gas structure inside dust cavities of transition disks: Ophiuchus IRS 48 observed by ALMA". Astronomy and Astrophysics. 562. arXiv:1312.2756Freely accessible. Bibcode:2014A&A...562A..26B. doi:10.1051/0004-6361/201322857. 
  2. ^ "2MASS J16273718-2430350". SIMBAD. Centre de données astronomiques de Strasbourg. 
  3. ^ ALMA Discovers Comet Factory.
  4. ^ ALMA Discovers Comet Factory.
  5. ^ Simon Bruderer , Nienke van der Marel, Ewine F. van Dishoeck and Tim A. van Kempen, Gas structure inside dust cavities of transition disks: Oph IRS 48 observed by ALMA, Astronomy and Astrophysics. 12/2013; p562.
  6. ^ 'Dust Trap' around Distant Star May Solve Planet Formation Mystery.
  7. ^ jp-carousel-117541.
  8. ^ Nienke van der Marel (1), Ewine F. van Dishoeck (1 and 2), Simon Bruderer (2), Tim A. van Kempen , Warm formaldehyde in the Oph IRS 48 transitional disk.