Elias 2-27
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Ophiuchus |
| Right ascension | 16h 26m 45.025s[1] |
| Declination | −24° 23′ 07.75″[1] |
| Apparent magnitude (V) | 13.32[1] |
| Characteristics | |
| Evolutionary stage | Pre-main-sequence star |
| Spectral type | M0[1] |
| Astrometry | |
| Distance | 378 ly (116+19 −10[2] pc) |
| Details[2] | |
| Mass | 0.46+0.02 −0.03 M☉ |
| Radius | 2.3 R☉ |
| Temperature | 3850 K |
| Age | 0.8 Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Elias 2-27 (2MASS J16264502-2423077)[1] is a YSO star[1] with a protoplanetary disk around it, located in the Ophiuchus Molecular Cloud (ρ Oph Cld, 5 Oph Cld, Ophiuchus Dark Cloud), a star-forming region in the Ophiuchus constellation, some 450 light-years (140 parsecs) away. This star system became the first ever observed with density waves in the disk, giving it a spiral structure. Elias 2-27 is located near the double star Rho Ophiuchi (5 Ophiuchi).[3][4]
Disk
In 2016, it was discovered that disk perturbations from density waves organized the disk debris into a pinwheel structure, with sweeping spiral arms; using observations from the Atacama Large Millimeter Array (ALMA) radio telescope. This marks the first instance of such an observation in a protoplanetary disk, though they have been previously predicted. The spiral arms start at 100 AU (9.3×109 mi; 1.5×1010 km) and extend out to 300 AU (2.8×1010 mi; 4.5×1010 km).[6][3] The disk has a 14 AU wide gap at 69 AU radius with a reduced amount of dust.[2] The disk is very massive at 0.08±0.04M☉.[7]
| Companion (in order from star) | Mass | Semimajor axis (AU) | Orbital period (days) | Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| protoplanetary disk | 5–300 AU | 56.2±0.8° | — | |||
Further reading
- Laura M. Pérez; et al. (2016). "Spiral density waves in a young protoplanetary disk". Science. 353 (6307) (published 30 September 2016): 1519–1521. arXiv:1610.05139. Bibcode:2016Sci...353.1519P. doi:10.1126/science.aaf8296. PMID 27708098. S2CID 38667381.
References
- ^ a b c d e f g "2MASS J16264502-2423077". SIMBAD. Centre de données astronomiques de Strasbourg.
- ^ a b c d Paneque-Carreño, T.; Pérez, L. M.; Benisty, M.; Hall, C.; Veronesi, B.; Lodato, G.; Sierra, A.; Carpenter, J. M.; Andrews, S. M.; Bae, Jaehan; Henning, Th.; Kwon, W.; Linz, H.; Loinard, L.; Pinte, C.; Ricci, L.; Tazzari, M.; Testi, L.; Wilner, D. (2021), "Spiral Arms and a Massive Dust Disk with Non-Keplerian Kinematics: Possible Evidence for Gravitational Instability in the Disk of Elias 2–27", The Astrophysical Journal, 914 (2): 88, arXiv:2103.14048, Bibcode:2021ApJ...914...88P, doi:10.3847/1538-4357/abf243, S2CID 232380120
- ^ a b Max Planck Institute (6 October 2016). "Astronomers Discover Density Waves in Protoplanetary Disk Surrounding Elias 2-27". SciTechDaily.
- ^ Charles Blue (29 September 2016). "Image Release: Spiral Arms Embrace Young Star". National Radio Astronomy Observatory.
- ^ "Spirals with a Tale to Tell". www.eso.org. Retrieved 6 October 2016.
- ^ "Protoplanetary disc's spiral arms embrace young star". Astronomy Now. 1 October 2016.
- ^ Veronesi, Benedetta; Paneque-Carreño, Teresa; Lodato, Giuseppe; Testi, Leonardo; Pérez, Laura M.; Bertin, Giuseppe; Hall, Cassandra (2021), "A Dynamical Measurement of the Disk Mass in Elias 2–27", The Astrophysical Journal Letters, 914 (2): L27, arXiv:2104.09530, Bibcode:2021ApJ...914L..27V, doi:10.3847/2041-8213/abfe6a, S2CID 233307149
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Constellation of Ophiuchus
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