HD 11964 c

HD 11964 c

Discovery
Discovered by	Butler et al.
Discovery site	California, United States
Discovery date	5 August 2005 Confirmed 27 May 2007
Detection method	Doppler spectroscopy
Orbital characteristics
Semi-major axis	0.229 AU (34,300,000 km)[1]
Eccentricity	0.15[1]
Orbital period (sidereal)	37.82[1] d
Time of periastron	2,454,370 ± 380[1]
Argument of periastron	102[1]
Semi-amplitude	4.65 ± 0.59[1]
Star	HD 11964

HD 11964 c is an extrasolar planet approximately 110 light-years away in the constellation of Cetus. The planet was discovered in a close-orbit around the yellow subgiant star HD 11964. The planet has a minimum mass 35 times the mass of Earth and is located in a mildly eccentric orbit which takes almost 38 days to complete. HD 11964 c was a possible planet discovered on the same day as HD 11964 b in 2005. HD 11964 c was first proposed in a paper published in 2007,^[2] and finally confirmed with new data presented in a review of multi-planet systems which appeared on the arXiv preprint website in 2008.^[1]

Some sources have used the designation "HD 11964 b" for this planet,^[3][4] however in their review of the properties of multi-planet extrasolar planetary systems, the discovery team has stated that the correct designation for this planet is HD 11964 c and the reversed system was due to confusion related to private communications between various groups of astronomers.^[1]

References

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. arXiv:0812.1582. Bibcode:2009ApJ...693.1084W. doi:10.1088/0004-637X/693/2/1084. S2CID 18169921.
2. Wright, J.T.; et al. (2007). "Four New Exoplanets and Hints of Additional Substellar Companions to Exoplanet Host Stars". The Astrophysical Journal. 657 (1): 533–545. arXiv:astro-ph/0611658. Bibcode:2007ApJ...657..533W. doi:10.1086/510553. S2CID 35682784.
3. Raghavan, D.; et al. (2006). "Two Suns in The Sky: Stellar Multiplicity in Exoplanet Systems". The Astrophysical Journal. 646 (1): 523–542. arXiv:astro-ph/0603836. Bibcode:2006ApJ...646..523R. doi:10.1086/504823. S2CID 5669768. Archived from the original on 2020-04-28. Retrieved 2009-03-16.
4. Schneider, J. "Notes for planet HD 11964 b". Extrasolar Planets Encyclopaedia. Retrieved 2008-12-15.