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]
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 ° | — |