V4046 Sagittarii
V4046 Sagittarii is a young binary consisting of two K-type main-sequence stars. The two stars are about 271 light-years (83 parsecs) away from the Earth.[3] The two stars orbit each other every 2.42 days on a circular orbit.[3]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Sagittarius |
| Right ascension | 18h 14m 10.4660s[1] |
| Declination | −32° 47′ 34.496″[1] |
| Apparent magnitude (V) | 10.68[2] |
| Characteristics | |
| Spectral type | K5Ve / K7Ve[3] |
| Variable type | T Tauri[3] |
| Astrometry | |
| Radial velocity (Rv) | −6.94[3] km/s |
| Distance | 271 ly (83[3] pc) |
| Orbit[3] | |
| Period (P) | 2.4213305(40) d |
| Semi-major axis (a) | 9.24 M☉ |
| Eccentricity (e) | ≤0.01 |
| Inclination (i) | 35° |
| Periastron epoch (T) | JD 2452380.867 ± 0.03 |
| Details | |
| Mass | 0.912 / 0.873[3] M☉ |
| Surface gravity (log g) | 4.0 / 4.0[3] cgs |
| Temperature | 4370 / 4100[3] K |
| Rotational velocity (v sin i) | 14.2 / 13.7[3] km/s |
| Age | ~12[4] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
V4046 Sagittarii is surrounded by a massive protoplanetary disk. The disk has a radius of about 370 astronomical units (au) with about 40 Earth masses of dust in the disk. V4046 Sagittarii is one of four pre-main-sequence star systems within 100 parsecs with protoplanetary disks, the others being TW Hydrae, HD 141569, and 49 Ceti. The two stars are still accreting matter from the disk, and gas giant planets may be forming in the disk as well.[4]
The red dwarf binary GSC 07396-00759 is separated about 2.82″ from V4046 Sagittarii. Since it has a similar motion throughout space with V4046 Sagittarii, GSC 07396-00759 is assumed to be gravitationally bound (although weakly) to V4046 Sagittarii. The two systems are separated by at least 12,350 astronomical units (0.1953 ly) away, and the orbital period would be on the order of 100,000 years.[5]
References
- Hog, E. (1998). "The Tycho Reference Catalogue". Astronomy and Astrophysics. 335: L65. Bibcode:1998A&A...335L..65H.
- Høg, E.; et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H.
- Stempels, H. C.; Gahm, G. F. (2004). "The close T Tauri binary V 4046 Sagittarii". Astronomy & Astrophysics. 421 (3): 1159. Bibcode:2004A&A...421.1159S. doi:10.1051/0004-6361:20034502.
- Rodriguez, David R.; Kastner, Joel H.; Wilner, David; Qi, Chunhua (2010). "Imaging the Molecular Disk Orbiting the Twin Young Suns of V4046 Sgr". The Astrophysical Journal. 720 (2): 1684. arXiv:1007.3993. Bibcode:2010ApJ...720.1684R. doi:10.1088/0004-637X/720/2/1684. S2CID 118379005.
- Kastner, J. H.; Sacco, G. G.; Montez, R.; Huenemoerder, D. P.; Shi, H.; Alecian, E.; Argiroffi, C.; Audard, M.; Bouvier, J.; Damiani, F.; Donati, J.-F.; Gregory, S. G.; Güdel, M.; Hussain, G. A. J.; Maggio, A.; Montmerle, T. (2011). "GSC 07396-00759 = V4046 Sgr C[D]: A Wide-separation Companion to the Close T Tauri Binary System V4046 Sgr AB". The Astrophysical Journal. 740 (1): L17. arXiv:1109.3389. Bibcode:2011ApJ...740L..17K. doi:10.1088/2041-8205/740/1/L17. S2CID 14660453.
External links
- "V4046 Sagittarii". Retrieved 2010-10-06.
- Huang, Jane; Öberg, Karin I.; Qi, Chunhua; Aikawa, Yuri; Andrews, Sean M.; Furuya, Kenji; Guzmán, Viviana V.; Loomis, Ryan A.; Van Dishoeck, Ewine F.; Wilner, David J. (2017). "An ALMA Survey of DCN/H13CN and DCO+/H13CO+ in Protoplanetary Disks". The Astrophysical Journal. 835 (2): 231. arXiv:1701.01735. Bibcode:2017ApJ...835..231H. doi:10.3847/1538-4357/835/2/231. S2CID 54805047.