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Astrometric confirmation of a wide low-mass companion to the planet host star HD89744

M. Mugrauer·R. Neuhäuser·T. Mazeh·E. Guenther·M. Fernández
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Abstract

In our ongoing deep infrared imaging search for faint wide secondaries of planet-candidate host stars we have confirmed astrometrically the companionship of a low-mass object to be co-moving with HD89744, a companion-candidate suggested already by Wilson et al. (2000). The derivation of the common proper motion of HD89744 and its companion, which are separated by 62.996+-0.035 arcsec, is based on about 5 year epoch difference between 2MASS and our own UKIRT/UFTI images. The companion effective temperature is about 2200 K and its mass is in the range between 0.072 and 0.081 Msun, depending on the evolutionary model. Therefore, HD89744B is either a very low mass stellar or a heavy brown dwarf companion.

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M. Mugrauer, R. Neuhäuser, T. Mazeh, E. Guenther, M. Fernández. 2004-04-15. Astrometric confirmation of a wide low-mass companion to the planet host star HD89744. https://doi.org/10.1002/asna.200410252

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