Astronomy:HD 11964
HD 11964 is a binary star system located 110[1] light-years away from the Sun in the equatorial constellation of Cetus. It is visible in binoculars or a telescope but is too faint to be seen with the naked eye, having an apparent visual magnitude of 7.51.[2] The system is drifting closer to the Sun with a radial velocity of −9 km/s.[5] Two extrasolar planets have been confirmed to orbit the primary.
Properties
The primary, component A, is a G-type main-sequence star with a stellar classification of G9VCN+1.[3] The suffix notation indicates an overabundance of the cyano radical in the spectrum. Houk and Swift (1999) found a class of G8IV, suggesting it is instead a more evolved subgiant star.[10] It is around seven[6] billion years old and is spinning slowly with a projected rotational velocity of 1.5 km/s.[5] The star has 1.1[6] times the mass of the Sun and 2.2[7] times the Sun's radius. It is radiating 2.9[6] times the luminosity of the Sun from its photosphere at an effective temperature of 5,321 K.[5]
A wide binary companion star was discovered in 2000.[11] This secondary, designated component B, has a visual magnitude of 11.11 and lies at an angular separation of 29.7″ along a position angle of 134°, as of 2015.[12] It is a red dwarf with a class of M0V,[4] and has just 0.6 times the Sun's radius. It is radiating 0.085 times the Sun's luminosity at an effective temperature of 4,033 K.[1]
Planetary system
In August 2005, two planets were discovered orbiting the star, the innermost like Neptune and another like Jupiter orbiting at 3.34 AU. However, the second planet (HD 11964 b) was not confirmed until May 2007. In September 2007, P.C. Gregory claimed that there was a third planet in the system on the basis of Bayesian analysis of the radial velocity data. The planet was claimed to have a mass similar to that of Saturn and located in a 360-day orbit. Gregory cautioned that the close match between the period of this planet to being exactly a year meant that the radial velocity variations may have been caused by insufficient correction for the motion of the Earth in orbit around the Sun.[13] The planet was not detected in re-reduced data in an analysis published in the Astrophysical Journal in 2009.[14]
Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
c | ≥ 0.11 MJ | 0.229 | 37.82 | 0.15 | — | — |
b | ≥ 0.61±0.1 MJ | 3.34±0.4 | 2,110±70 | 0.06±0.2 | — | — |
See also
- HD 11977
- List of extrasolar planets
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 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 records at VizieR:
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A.
- ↑ 3.0 3.1 Gray, R. O. et al. (July 2006). "Contributions to the Nearby Stars (NStars) Project: spectroscopy of stars earlier than M0 within 40 pc-The Southern Sample". The Astronomical Journal 132 (1): 161–170. doi:10.1086/504637. Bibcode: 2006AJ....132..161G.
- ↑ 4.0 4.1 Alonso-Floriano, F. J.; Morales, J. C.; Caballero, J. A.; Montes, D.; Klutsch, A.; Mundt, R.; Cortés-Contreras, M.; Ribas, I. et al. (2015). "CARMENES input catalogue of M dwarfs". Astronomy & Astrophysics 577: A128. doi:10.1051/0004-6361/201525803. Bibcode: 2015A&A...577A.128A. http://goedoc.uni-goettingen.de/goescholar/bitstream/handle/1/12402/aa25803-15.pdf.[yes|permanent dead link|dead link}}]
- ↑ 5.0 5.1 5.2 5.3 5.4 5.5 5.6 5.7 Jofré, E. et al. (2015). "Stellar parameters and chemical abundances of 223 evolved stars with and without planets". Astronomy & Astrophysics 574: A50. doi:10.1051/0004-6361/201424474. Bibcode: 2015A&A...574A..50J.
- ↑ 6.0 6.1 6.2 6.3 6.4 6.5 Ghezzi, L. et al. (December 2010), "Metallicities of Planet-hosting Stars: A Sample of Giants and Subgiants", The Astrophysical Journal 725 (1): 721–733, doi:10.1088/0004-637X/725/1/721, Bibcode: 2010ApJ...725..721G
- ↑ 7.0 7.1 van Belle, Gerard T.; von Braun, Kaspar (2009). "Directly Determined Linear Radii and Effective Temperatures of Exoplanet Host Stars". The Astrophysical Journal 694 (2): 1085–1098. doi:10.1088/0004-637X/694/2/1085. Bibcode: 2009ApJ...694.1085V.
- ↑ Mann, Andrew W. et al. (February 2013). "Prospecting in Late-type Dwarfs: A Calibration of Infrared and Visible Spectroscopic Metallicities of Late K and M Dwarfs Spanning 1.5 dex". The Astronomical Journal 145 (2): 15. doi:10.1088/0004-6256/145/2/52. 52. Bibcode: 2013AJ....145...52M.
- ↑ "HD 11964". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+11964.
- ↑ Houk, N.; Swift, C. (1999). "Michigan catalogue of two-dimensional spectral types for the HD Stars". Michigan Spectral Survey 5. Bibcode: 1999MSS...C05....0H.
- ↑ Allen, C. et al. (2000). "Wide binaries among high-velocity and metal-poor stars". Astronomy and Astrophysics 356 (2): 529–540. Bibcode: 2000A&A...356..529A. http://aa.springer.de/papers/0356002/2300529/small.htm. Retrieved 2008-10-07.
- ↑ Mason, B. D. et al. (2014). "The Washington Visual Double Star Catalog". The Astronomical Journal 122 (6): 3466. doi:10.1086/323920. Bibcode: 2001AJ....122.3466M. http://vizier.u-strasbg.fr/viz-bin/VizieR?-source=B/wds. Retrieved 2015-07-22.
- ↑ Gregory, P. C. (2007). "A Bayesian periodogram finds evidence for three planets in HD 11964". Monthly Notices of the Royal Astronomical Society 381 (4): 1607–1616. doi:10.1111/j.1365-2966.2007.12361.x. Bibcode: 2007MNRAS.381.1607G.
- ↑ 14.0 14.1 Wright, J. T. et al. (2009). "Ten New and Updated Multi-planet Systems, and a Survey of Exoplanetary Systems". The Astrophysical Journal 693 (2): 1084–1099. doi:10.1088/0004-637X/693/2/1084. Bibcode: 2009ApJ...693.1084W.
External links
- Extrasolar Planet Interactions by Rory Barnes & Richard Greenberg, Lunar and Planetary Lab, University of Arizona
Coordinates: 01h 57m 09.6064s, −10° 14′ 32.739″
![]() | Original source: https://en.wikipedia.org/wiki/HD 11964.
Read more |