Wikipedia
2MASS 1507−1627
2MASS J15074769−1627386 (also abbreviated to 2MASS 1507−1627) is a brown dwarf in the constellation Libra, located about 23.9 light-years from Earth. It was discovered in 1999 by I. Neill Reid et al.[4] It belongs to the spectral class L5; its surface temperature is 1,300 to 2,000 kelvins. As with other brown dwarfs of spectral type L, its spectrum is dominated by metal hydrides and alkali metals. Its spectrum also has a weak silicate absorption band and highly variable water absorption band, indicating a complicated clouds and haze structures.[5]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Libra |
| Right ascension | 15h 07m 47.69s |
| Declination | −16° 27′ 38.6″ |
| Apparent magnitude (V) | 22.136 |
| Characteristics | |
| Evolutionary stage | brown dwarf |
| Spectral type | L5 |
| Apparent magnitude (R) | 18.928±0.097 |
| Apparent magnitude (J) | 12.830 ± 0.027 |
| Apparent magnitude (H) | 11.895 ± 0.024 |
| Apparent magnitude (K) | 11.312 ± 0.026 |
| Astrometry | |
| Radial velocity (Rv) | -39.85[1] km/s |
| Proper motion (μ) | RA: -151.645[1] mas/yr Dec.: -895.714[1] mas/yr |
| Parallax (π) | 134.9474 ± 0.2611 mas[2] |
| Distance | 24.17 ± 0.05 ly (7.41 ± 0.01 pc) |
| Details[3] | |
| Radius | 0.08 R☉ |
| Surface gravity (log g) | 5.5 cgs |
| Temperature | 1600 K |
| Other designations | |
2MASS J15074769-1627386, 2MASSW J1507476162738, 2MUCD 11296, 2MASSI J1507476−162738, Gaia DR2 6306068659857135232 | |
| Database references | |
| SIMBAD | data |
The brown dwarf is suspected to have a substellar companion (planet) on wide orbit with period over 10 years.[6]
References edit
- ^ a b c "2MASSW J1507476-162738". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 16 October 2020.
- ^ Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
- ^ Stephens, D. C.; Leggett, S. K.; Cushing, Michael C.; Marley, Mark S.; Saumon, D.; Geballe, T. R.; Golimowski, David A.; Fan, Xiaohui; Noll, K. S. (2009), "The 0.8–14.5 μm Spectra of Mid-L to Mid-T Dwarfs: Diagnostics of Effective Temperature, Grain Sedimentation, Gas Transport, and Surface Gravity", The Astrophysical Journal, 702 (1): 154–170, arXiv:0906.2991, Bibcode:2009ApJ...702..154S, doi:10.1088/0004-637X/702/1/154, S2CID 118650774
- ^ Reid, I. Neill; Kirkpatrick, J. Davy; Gizis, J. E.; Dahn, C. C.; Monet, D. G.; Williams, Rik J.; Liebert, James; Burgasser, Adam J. (2000), "Four nearby L dwarfs", The Astronomical Journal, 119 (1): 369–377, arXiv:astro-ph/9909336, Bibcode:2000AJ....119..369R, doi:10.1086/301177, S2CID 12306473
- ^ Yang, Hao; Apai, Dániel; Marley, Mark S.; Saumon, Didier; Morley, Caroline V.; Buenzli, Esther; Artigau, Étienne; Radigan, Jacqueline; Metchev, Stanimir; Burgasser, Adam J.; Mohanty, Subhanjoy; Lowrance, Patrick J.; Showman, Adam P.; Karalidi, Theodora; Flateau, Davin; Heinze, Aren N. (2014), "HST Rotational Spectral Mapping of Two L-Type Brown Dwarfs: Variability in and Out of Water Bands Indicates High-Altitude Haze Layers", The Astrophysical Journal, 798: L13, arXiv:1411.2911, doi:10.1088/2041-8205/798/1/L13, S2CID 26179429
- ^ Prato, L.; Mace, G. N.; Rice, E. L.; McLean, I. S.; Kirkpatrick, J. Davy; Burgasser, Adam J.; Kim, Sungsoo S. (2015), "Radial velocity variability of field brown dwarfs", The Astrophysical Journal, 808 (1): 12, arXiv:1506.02771, Bibcode:2015ApJ...808...12P, doi:10.1088/0004-637X/808/1/12, S2CID 26692089
External links edit
- Entry at DwarfArchives.org 2019-06-10 at the Wayback Machine