Astronomy:Substellar companion
Substellar companion is a generic term for an astronomical body orbiting a star.
It can describe a celestial bodies too small to be a star, but too big to be called a planet.[1] Alternatively, it is a substellar object such as exoplanet or brown dwarf that is orbiting a star.[2] Objects as low as 8-23 Jupiter masses have been called a substellar companion.[3]
Objects orbiting a star are often called a planet below 13 Jupiter masses and brown dwarf above that.[4] Companions at that planet-brown dwarf borderline have been called Super-Jupiters, such around the star Kappa Andromedae.[5] Nevertheless, objects as small as 8 Jupiter masses have been called a brown dwarf.[6]
A substellar companion is thought to exist in the binary star system SDSS 1212.[7] Substellar companions have been confirmed by analyzing astrometric data from Hipparcos.[8]
See also
- Red dwarf
- Sub-stellar object
- List of planet types
References
- ↑ 1.0 1.1 STScI-1995-48
- ↑ Mugrauer, M., et al - Direct detection of a substellar companion to the young nearby star PZ Telescopii (2010)
- ↑ S. Geier, et al - Discovery of a Close Substellar Companion to the Hot Subdwarf Star HD 149382 (2009)
- ↑ Nomenclature: Brown Dwarfs, Gas Giant Planets, and ?, Brown Dwarfs, Proceedings of IAU Symposium #211, held 20–24 May 2002 at University of Hawaii, Honolulu, Boss, A. P., Basri, G., Kumar, S. S., Liebert, J., Martín, E. L., Reipurth, B
- ↑ Astronomers Directly Image Massive Star's 'Super-Jupiter'11.19.12
- ↑ Discovery of a Planetary-Mass Brown Dwarf with a Circumstellar Disk, Luhman, et al., 2005
- ↑ Detection of Substellar Companion in Interacting Binary
- ↑ Sabine Reffert, Andreas Quirrenbach - Mass constraints on substellar companion candidates from the re-reduced Hipparcos intermediate astrometric data: Nine confirmed planets and two confirmed brown dwarfs (2011)
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