2MASS J03552337+1133437
Brown dwarf in the constellation Taurus
From Wikipedia, the free encyclopedia
2MASS J03552337+1133437 (2MASS J0355+11) is a nearby brown dwarf of spectral type L5γ,[3] located in the constellation Taurus at approximately 29.9 light-years from Earth.[2]
| Observation data Epoch J2000[1] Equinox J2000[1] | |
|---|---|
| Constellation | Taurus |
| Right ascension | 03h 55m 23.374s[2] |
| Declination | +11° 33′ 43.80″[2] |
| Characteristics | |
| Evolutionary stage | brown dwarf |
| Spectral type | L5γ[3] |
| Apparent magnitude (G) | 19.5831 |
| Apparent magnitude (J) | 14.05 |
| Apparent magnitude (H) | 12.53 |
| Apparent magnitude (K) | 11.526 |
| J−H colour index | 1.52 |
| J−K colour index | 2.52 |
| Astrometry | |
| Radial velocity (Rv) | 11.92[1] km/s |
| Proper motion (μ) | RA: 223.182 mas/yr[2] Dec.: -631.303 mas/yr[2] |
| Parallax (π) | 109.1381±0.4833 mas[2] |
| Distance | 29.9 ± 0.1 ly (9.16 ± 0.04 pc) |
| Other designations | |
| EPIC 210327027, 2MASS J03552337+1133437, WISEA J035523.53+113337.2, BNA 3[1] | |
| Database references | |
| SIMBAD | data |
Characteristics
2MASS J0355+11 was discovered in 2006 by Reid et al.[4]
It is young, has a low surface gravity and a red spectral energy distribution compared to field brown dwarfs.[5] It likely belongs to the AB Doradus moving group, which is 50 million years old.[6][7] At this age it would have a mass of about 13 MJ. Alternatively at an older age of 150 Myrs it would have a mass of about 30 MJ. It has a very red color thought to be caused by photospheric dust.[5]
A study with James Webb Space Telescope's MIRI instrument found silicate features that are shifted to bluer wavelengths compared to other brown dwarfs in the same sample. The researchers found a 10% flux difference in the mid-infrared between JWST and Spitzer spectra. But it is not clear if this is due systematic uncertainties between the instruments or real variability. Multiple MIRI observations are needed to confirm this variability.[8]
It is a radio-quiet brown dwarf, indicating an absence of stellar flares.[9] Its carbon to oxygen ratio, equal to 0.56, is similar to that of the Sun.[10]
A 2010 search for companions to L dwarfs identified this object as a candidate binary system.[11]
The interstellar comet 2I/Borisov passed 1.4 light-years (0.44 parsecs) from 2MASS J0355+11 280 thousand years before arriving in the Solar System.[12]
