Oph-IRS 48

Oph-IRS 48

Artist's impression of Oph-IRS 48's dust disk
Observation data
Epoch J2000      Equinox J2000
Constellation Ophiuchus
Right ascension 16h 27m 37.18s[1]
Declination −24° 30′ 35.3″[1]
Apparent magnitude (V) 14.80[2]
Characteristics
Spectral type B5-F2[1]
Astrometry
Proper motion (μ) RA: −9.190[2] mas/yr
Dec.: −23.995[2] mas/yr
Parallax (π)7.4375 ± 0.1157 mas[2]
Distance439 ± 7 ly
(134 ± 2 pc)
Details[1]
Mass2 M☉
Luminosity14.3 L☉
Other designations
IRAS 16245-2423, 2MASS J16273718-2430350 Gaia DR2 6049145880875631744
Database references
SIMBADdata

Oph-IRS 48 is a star surrounded by a protoplanetary disk, about 444 light-years from Earth in the constellation of Ophiuchus.[3] The disk has changed 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.[3][4][5] The centimeter grains are even more concentrated inside the crescent.[6] This structure is consistent with theoretical predictions of dust trapping. Also the chemical composition has been studied, with molecules like H2CO being present.[7] The dust trap is thought to be conducting the process of planet formation in this young system.

References

  1. ^ a b c d Bruderer, Simon; et al. (2014). "Gas structure inside dust cavities of transition disks: Ophiuchus IRS 48 observed by ALMA". Astronomy and Astrophysics. 562: A26. arXiv:1312.2756. Bibcode:2014A&A...562A..26B. doi:10.1051/0004-6361/201322857. S2CID 21707964.
  2. ^ a b c d "2MASS J16273718-2430350". SIMBAD. Centre de données astronomiques de Strasbourg.
  3. ^ a b ALMA Discovers Comet Factory.
  4. ^ 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.
  5. ^ 'Dust Trap' around Distant Star May Solve Planet Formation Mystery.
  6. ^ jp-carousel-117541.
  7. ^ 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.


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