G 196-3
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Ursa Major |
| Right ascension | 10h 04m 21.4629s[1] |
| Declination | 50° 23′ 13.3872″[1] |
| Apparent magnitude (V) | 13.3 |
| Characteristics | |
| Spectral type | M3V |
| U−B color index | +1.67 |
| B−V color index | +1.16 |
| Astrometry | |
| Radial velocity (Rv) | 11.7 km/s |
| Proper motion (μ) | RA: −141.177±0.055[1] mas/yr Dec.: −202.394±0.053[1] mas/yr |
| Parallax (π) | 45.8611 ± 0.0388 mas[1] |
| Distance | 71.12 ± 0.06 ly (21.80 ± 0.02 pc) |
| Absolute magnitude (MV) | 13.33 |
| Other designations | |
| Database references | |
| SIMBAD | data |
G 196-3 is a young low-mass M dwarf type star which is about 100 million years old. The star is located within the Ursa Major constellation about 71.1 light years away[1] from the Earth. During observations by Instituto de Astrofísica de Canarias in Tenerife, Spain in 1998, a substellar-mass object was discovered to orbit approximately 300 astronomical units (AU) from the star. It was detected using direct imaging.[2][3][4][5]
Substellar companion
[edit]Observations of the substellar object were performed on January 25, 1998 where a faint red companion was present 16.2 arc seconds southwest of the star. A comparison of images taken at different wavelengths was done using low-intermediate-resolution spectroscopy confirmed the presence of a substellar object which was named G 196-3B. The Further observations confirmed the discovery when the team of Rafael Rebolo obtained R & I broadband photometry on March 19, 1998. The TCS Telescope showed its very cool nature in near-infrared (K Band). The comparison of the optical and infrared magnitudes including dust condensation has allowed astronomers to conclude that the substellar object was 25–10+15 Jupiter masses or simply 25 masses that of the Jovian-planet Jupiter. This was the second[6][7] discovery of a brown dwarf that was found around a low-mass star whose age[8] was relatively young. The separation of the star and the substellar object has suggested that both were parts of a fragment from a collapsing cloud although another possible scenario suggests that it originated from a dissipated protoplanetary disk.[9][2][10][11][12][13]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| B | 26±1 MJ | 350±1 | — | — | — | 1.36±0.23 RJ |
See also
[edit]References
[edit]- ^ a b c d e f Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ a b Rafael Rebolo; et al. (1998). "Discovery of a Low-Mass Brown Dwarf Companion of the Young Nearby Star G 196-3". Science. 282 (5392): 1309–1312. arXiv:astro-ph/9811413. Bibcode:1998Sci...282.1309R. doi:10.1126/science.282.5392.1309. PMID 9812893. S2CID 10595230.
- ^ Kirkpatrick, J. Davy; Gizis, John E.; Burgasser, Adam J.; Wilson, John C.; Dahn, Conard C.; Monet, David G.; Reid, I. Neill; Liebert, James (2001). "Low-Luminosity Companions to Nearby Stars: Status of the 2MASS Data Search". In Jones, Hugh R. A.; Steele, Iain A. (eds.). Ultracool Dwarfs: New Spectral Types L and T. Berlin/Heidelberg: Springer. p. 125. Bibcode:2001udns.conf..125K. doi:10.1007/978-3-642-56672-1_12. ISBN 978-3-642-56672-1.
- ^ "G 196-3". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2010-02-18.
- ^ "Lowell Proper Motion Survey 8991 Northern Stars (Giclas 1971) ReadMe". Centre de Donnes Astronomiques. Retrieved 2010-02-09.
- ^ "G196-3B : the second discovery of a brown dwarf around a low-mass star". Instituto de Astrofísica de Canarias (IAC). Retrieved 2010-02-22.
- ^ R. Rebolo (2000). "Lithium in Brown Dwarfs". The Light Elements and Their Evolution, Proceedings of IAU Symposium 198, Held 22-26 Nov 1999, Natal, Brazil. Edited by L. Da Silva, R. De Medeiros, & M Spite, 2000. 198: 299. Bibcode:2000IAUS..198..299R.
- ^ "ING Scientific Highlights in 1998". Isaac Newton Group of Telescopes. Retrieved 2010-02-18.
- ^ "Resultados más relevantes". IAC. Retrieved 2010-02-18.
- ^ "196-3B". ExtraSolar.net. Archived from the original on 2010-09-21. Retrieved 2010-02-18.
- ^ McGovern, Mark R.; Kirkpatrick, J. Davy; McLean, Ian S.; Burgasser, Adam J.; Prato, L.; Lowrance, Patrick J. (2004). "Identifying Young Brown Dwarfs Using Gravity-Sensitive Spectral Features". The Astrophysical Journal. 600 (2): 1020–1024. arXiv:astro-ph/0309634. Bibcode:2004ApJ...600.1020M. doi:10.1086/379849. S2CID 475796.
- ^ Allers; Liu; Dupuy; Cushing (2009). "Discovery of Young Dwarf L Binary". Astrophysical Journal. 715 (561): 561–571. arXiv:0912.4687. Bibcode:2010ApJ...715..561A. doi:10.1088/0004-637X/715/1/561. S2CID 116058913.
- ^ "2MASSW J1004207+502300". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2010-02-18.
- ^ "G 196-3 Overview". NASA Exoplanet Archive.
- ^ Filippazzo, Joseph C.; Rice, Emily L.; Faherty, Jacqueline; Cruz, Kelle L.; Van Gordon, Mollie M.; Looper, Dagny L. (2015-09-10). "Fundamental Parameters and Spectral Energy Distributions of Young and Field Age Objects with Masses Spanning the Stellar to Planetary Regime". The Astrophysical Journal. 810 (2): 158. arXiv:1508.01767. doi:10.1088/0004-637X/810/2/158. ISSN 1538-4357.
