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 Spiral Arms and a Massive Dust Disk with non-Keplerian Kinematics: Possible Evidence for Gravitational Instability in the Disk of Elias 2-27, 2021, arXiv:2103.14048
- ^ 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.
- ^ A dynamical measurement of the disk mass in Elias 2-27, 2021, arXiv:2104.09530