2MASSW J2148+4003
 | |
| Observation data Epoch J2000.0 Equinox ICRS | |
|---|---|
| Constellation | Cygnus |
| Right ascension | 21h 48m 16.30s[1] |
| Declination | +40° 03′ 59.3″[1] |
| Characteristics | |
| Evolutionary stage | Brown dwarf |
| Spectral type | L6pec[2] |
| Astrometry | |
| Parallax (π) | 123.2758±0.4557 mas[3] |
| Distance | 26.46 ± 0.10 ly (8.11 ± 0.03 pc) |
| Other designations | |
| 2MASSW J21481628+4003593, 2MASS J21481628+4003593, WISEA J214817.01+400404.1, TIC 305387751, Gaia DR3 1954170404122975232[1] | |
| Database references | |
| SIMBAD | data |
2MASSW J21481628+4003593 (also known as 2MASSW J2148+4003) is a nearby L-type brown dwarf located in the constellation of Cygnus. It is notable for its peculiar, dusty atmosphere indicative of high metallicity.[4][5][6]
Observation
The object was discovered in 2008 during a proper-motion survey using multiepoch data from the Two Micron All Sky Survey (2MASS), which covered approximately 4700 square degrees of sky near the Galactic plane.[4]
Optical spectroscopy classifies 2MASS J21481628+4003593 as spectral type L6, with some classifications noting it as L6 peculiar due to its atypical features. In the near-infrared, it displays a triangular-shaped H-band continuum, strong carbon monoxide absorption, and an unusually red J − Ks color of 2.38 ± 0.06.[4] Mid-infrared observations show prominent silicate absorption features between 9 and 11 μm, attributed to thick condensate clouds in its atmosphere.[7]
These properties are interpreted as arising from enhanced dust content due to high metallicity, rather than low surface gravity from youth.[7] Atmospheric models suggest an effective temperature (Teff) of approximately 1500 K and solar to supersolar metallicity.[8]
References
- 1 2 3 "2MASSW J2148162+400359". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 12 March 2026.
- ↑ Kirkpatrick, J. Davy; Looper, Dagny L.; Burgasser, Adam J.; Schurr, Steven D.; Cutri, Roc M.; Cushing, Michael C.; Cruz, Kelle L.; Sweet, Anne C.; Knapp, Gillian R.; Barman, Travis S.; Bochanski, John J.; Roellig, Thomas L.; McLean, Ian S.; McGovern, Mark R.; Rice, Emily L. (1 September 2010). "Discoveries from a Near-Infrared Proper Motion Survey Using Multi-Epoch Two Micron All-Sky Survey Data". The Astrophysical Journal Supplement Series. 190 (1): 100–146. arXiv:1008.3591. Bibcode:2010ApJS..190..100K. doi:10.1088/0067-0049/190/1/100. ISSN 0067-0049.
- ↑ European Space Agency; collaboration, Gaia (2018), Gaia DR2, Centre de Donnees Strasbourg (CDS), doi:10.26093/CDS/VIZIER.1345, retrieved 13 March 2026
- 1 2 3 Looper, Dagny L.; Kirkpatrick, J. Davy; Cutri, Roc M.; Barman, Travis; Burgasser, Adam J.; Cushing, Michael C.; Roellig, Thomas; McGovern, Mark R.; McLean, Ian S.; Rice, Emily; Swift, Brandon J.; Schurr, Steven D. (10 October 2008). "Discovery of Two Nearby Peculiar L Dwarfs from the 2MASS Proper-Motion Survey: Young or Metal-Rich?". The Astrophysical Journal. 686 (1): 528–541. arXiv:0806.1059. Bibcode:2008ApJ...686..528L. doi:10.1086/591025. ISSN 0004-637X.
- ↑ Balmer, William O.; Kammerer, Jens; Pueyo, Laurent; Perrin, Marshall D.; Girard, Julien H.; Leisenring, Jarron M.; Lawson, Kellen; Dennen, Henry; van der Marel, Roeland P.; Beichman, Charles A.; Bryden, Geoffrey; Llop-Sayson, Jorge; Valenti, Jeff A.; Lothringer, Joshua D.; Lewis, Nikole K. (1 April 2025). "JWST-TST High Contrast: Living on the Wedge, or, NIRCam Bar Coronagraphy Reveals CO 2 in the HR 8799 and 51 Eri Exoplanets' Atmospheres". The Astronomical Journal. 169 (4): 209. doi:10.3847/1538-3881/adb1c6. ISSN 0004-6256.
- ↑ Oliveros-Gomez, Natalia; Manjavacas, Elena; Bardalez Gagliuffi, Daniella C.; Karalidi, Theodora; Vos, Johanna M.; Faherty, Jacqueline K. (1 June 2024). "An Informed and Systematic Method to Identify Variable Mid-L Dwarfs". The Astrophysical Journal. 967 (2): 149. arXiv:2404.02140. Bibcode:2024ApJ...967..149O. doi:10.3847/1538-4357/ad39e4. ISSN 0004-637X.
- 1 2 Suárez, Genaro; Metchev, Stanimir (8 June 2023). "Ultracool dwarfs observed with the Spitzer Infrared Spectrograph – III. Dust grains in young L dwarf atmospheres are heavier". Monthly Notices of the Royal Astronomical Society. 523 (3): 4739–4747. doi:10.1093/mnras/stad1711. ISSN 0035-8711.
- ↑ Witte, S.; Helling, Ch; Barman, T.; Heidrich, N.; Hauschildt, P. H. (1 May 2011). "Dust in brown dwarfs and extra-solar planets - III. Testing synthetic spectra on observations". Astronomy & Astrophysics. 529: A44. Bibcode:2011A&A...529A..44W. doi:10.1051/0004-6361/201014105. ISSN 0004-6361.