Astronomy:Elias 2-27
Coordinates: 
16h 26m 45.025s, -2423° 07.75′ 430″
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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 (2016). "Spiral density waves in a young protoplanetary disk". Science 353 (6307): 1519–1521. 30 September 2016. doi:10.1126/science.aaf8296. PMID 27708098. Bibcode: 2016Sci...353.1519P.
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 "2MASS J16264502-2423077". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=2MASS+J16264502-2423077.
- ↑ 2.0 2.1 2.2 2.3 Paneque-Carreño, T.; Pérez, L. M.; Benisty, M.; Hall, C.; Veronesi, B.; Lodato, G.; Sierra, A.; Carpenter, J. M. et al. (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, doi:10.3847/1538-4357/abf243, Bibcode: 2021ApJ...914...88P
- ↑ 3.0 3.1 Max Planck Institute (6 October 2016). "Astronomers Discover Density Waves in Protoplanetary Disk Surrounding Elias 2-27". SciTechDaily. http://scitechdaily.com/astronomers-discover-density-waves-in-protoplanetary-disk-surrounding-elias-2-27/.
- ↑ Charles Blue (29 September 2016). "Image Release: Spiral Arms Embrace Young Star". National Radio Astronomy Observatory. https://public.nrao.edu/news/pressreleases/2016-alma-elias-spiral.
- ↑ "Spirals with a Tale to Tell". https://www.eso.org/public/images/potw1640a/.
- ↑ "Protoplanetary disc's spiral arms embrace young star". Astronomy Now. 1 October 2016. https://astronomynow.com/tag/elias-2-27/.
- ↑ 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, doi:10.3847/2041-8213/abfe6a, Bibcode: 2021ApJ...914L..27V
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