Astrometric confirmation of a wide low-mass companion to the planet host star HD89744
作者： M. Mugrauer , R. Neuhäuser , T. Mazeh , E. Guenther , M. Fernández
关键词: Brown dwarf 、 Low Mass 、 Effective temperature 、 Proper motion 、 Astrophysics 、 Planet 、 Star (graph theory) 、 Stars 、 Epoch (astronomy) 、 Physics
摘要: In our ongoing deep infrared imaging search for faint wide secondaries of planet-candidate host stars we have confirmed astrometrically the companionship a low-mass object to be co-moving with HD89744, companion-candidate suggested already by Wilson et al. (2000). The derivation common proper motion HD89744 and its companion, which are separated 62.996+-0.035 arcsec, is based on about 5 year epoch difference between 2MASS own UKIRT/UFTI images. companion effective temperature 2200 K mass in range 0.072 0.081 Msun, depending evolutionary model. Therefore, HD89744B either very low stellar or heavy brown dwarf companion.
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