Astronomy:G 196-3
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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[1] mas |
| Distance | 71.12 ± 0.06 ly (21.80 ± 0.02 pc) |
| Absolute magnitude (MV) | 13.33 |
| Other designations | |
TYC 3440-13-1, NLTT 23293 | |
| 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
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 | 15+30 −4 MJ |
390 | — | — | — | — |
See also
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 2.0 2.1 Rafael Rebolo (1998). "Discovery of a Low-Mass Brown Dwarf Companion of the Young Nearby Star G 196-3". Science 282 (5392): 1309–1312. doi:10.1126/science.282.5392.1309. PMID 9812893. Bibcode: 1998Sci...282.1309R.
- ↑ 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". Berlin/Heidelberg: Springer. pp. 125. doi:10.1007/978-3-642-56672-1_12. ISBN 978-3-642-56672-1. Bibcode: 2001udns.conf..125K.
- ↑ "G 196-3". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=G+196-3.
- ↑ "Lowell Proper Motion Survey 8991 Northern Stars (Giclas 1971) ReadMe". Centre de Donnes Astronomiques. http://vizier.u-strasbg.fr/viz-bin/VizieR-S?G%20196-3A.
- ↑ "G196-3B : the second discovery of a brown dwarf around a low-mass star". Instituto de Astrofísica de Canarias (IAC). http://www.iac.es/telescopes/cain/cain_resultados.html#G196-3B%20:%20the%20second%20discovery%20of%20a%20brown%20dwarf%20around%20a%20low-ma.
- ↑ 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. http://www.ing.iac.es/PR/AR1998/high_98.html.
- ↑ "Resultados más relevantes". IAC. http://www.iac.es/telescopes/cain/cain_resultados.html.
- ↑ "196-3B". ExtraSolar.net. http://www.extrasolar.net/planettour.asp?StarCatID=browndwarf&PlanetID=98.
- ↑ 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. doi:10.1086/379849. Bibcode: 2004ApJ...600.1020M. http://www.iop.org/EJ/article/0004-637X/600/2/1020/17726.text.html.
- ↑ Allers; Liu; Dupuy; Cushing (2009). "Discovery of Young Dwarf L Binary". Astrophysical Journal 715 (561): 561–571. doi:10.1088/0004-637X/715/1/561. Bibcode: 2010ApJ...715..561A.
- ↑ "2MASSW J1004207+502300". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=2MASSW+J1004207%2B502300.
- ↑ "Spectral energy distribution simulations of a possible ring structure around the young, red brown dwarf G 196-3 B", Monthly Notices of the Royal Astronomical Society 464 (1): 1108–1118, 2017, doi:10.1093/mnras/stw2308
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