英文互译镜像站

Oph-IRS 48

Last updated
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 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]
Distance 439 ± 7  ly
(134 ± 2  pc)
Details [1]
Mass 2  M☉
Luminosity 14.3  L☉
Other designations
IRAS 16245-2423, 2MASS J16273718-2430350 Gaia DR2 6049145880875631744
Database references
SIMBAD data

Oph-IRS 48, nicknamed the Cosmic Croissant for its unique shape, 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. 1 2 3 4 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. 1 2 3 4 "2MASS J16273718-2430350". SIMBAD . Centre de données astronomiques de Strasbourg.
  3. 1 2 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.
This page is based on this Wikipedia article
Text is available under the CC BY-SA 4.0 license; additional terms may apply.
Images, videos and audio are available under their respective licenses.
时间因子转换镜像 镜像程序 站群镜像程序 YES镜站站群引擎 泛域名镜像