Elias 2-27

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]

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
Distance378 ly
(116+19
−10[2] pc)
Details[2]
Mass0.46+0.02
−0.03 M☉
Radius2.3 R☉
Temperature3850 K
Age0.8 Myr
Other designations
Gaia DR2 6049161819498750208, 2MASS J16264502-2423077[1]
Database references
SIMBADdata

Disk
Protoplanetary disk surrounding the young star Elias 2-27, located some 450 light years away.[5]

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]

The planetary system[2]
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 (published 30 September 2016). 353 (6307): 1519–1521. arXiv:1610.05139. Bibcode:2016Sci...353.1519P. doi:10.1126/science.aaf8296. PMID 27708098. S2CID 38667381.

References
  1. "2MASS J16264502-2423077". SIMBAD. Centre de données astronomiques de Strasbourg.
  2. 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, doi:10.3847/1538-4357/abf243, S2CID 232380120
  3. Max Planck Institute (6 October 2016). "Astronomers Discover Density Waves in Protoplanetary Disk Surrounding Elias 2-27". SciTechDaily.
  4. Charles Blue (29 September 2016). "Image Release: Spiral Arms Embrace Young Star". National Radio Astronomy Observatory.
  5. "Spirals with a Tale to Tell". www.eso.org. Retrieved 6 October 2016.
  6. "Protoplanetary disc's spiral arms embrace young star". Astronomy Now. 1 October 2016.
  7. 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, doi:10.3847/2041-8213/abfe6a, S2CID 233307149
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