Astronomy:2MASS 1507−1627
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Short description: Star in the constellation Libra
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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[2] mas |
| 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 |
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]
The brown dwarf is suspected to have a substellar companion (planet) on wide orbit with period over 10 years.[6]
References
- ↑ 1.0 1.1 1.2 "2MASSW J1507476-162738". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=2MASSW+J1507476-162738.
- ↑ Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G. 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 et al. (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, doi:10.1088/0004-637X/702/1/154, Bibcode: 2009ApJ...702..154S
- ↑ 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, doi:10.1086/301177, Bibcode: 2000AJ....119..369R
- ↑ Yang, Hao; Apai, Dániel; Marley, Mark S.; Saumon, Didier; Morley, Caroline V.; Buenzli, Esther; Artigau, Étienne; Radigan, Jacqueline et al. (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, doi:10.1088/2041-8205/798/1/L13
- ↑ 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, doi:10.1088/0004-637X/808/1/12, Bibcode: 2015ApJ...808...12P
External links
Coordinates: 
15h 07m 47.69s, −16° 27′ 38.6″
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