TY - JOUR
T1 - Astrometric confirmation of a wide low-mass companion to the planet host star HD 89744
AU - Mugrauer, M.
AU - Neuhäuser, R.
AU - Mazeh, T.
AU - Guenther, E.
AU - Fernández, M.
PY - 2004
Y1 - 2004
N2 - 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 HD 89744, a companion-candidate suggested already by Wilson et al. (2000). The derivation of the common proper motion of HD 89744 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 M⊙, depending on the evolutionary model. Therefore, HD 89744 B is either a very low mass stellar or a heavy brown dwarf companion.
AB - 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 HD 89744, a companion-candidate suggested already by Wilson et al. (2000). The derivation of the common proper motion of HD 89744 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 M⊙, depending on the evolutionary model. Therefore, HD 89744 B is either a very low mass stellar or a heavy brown dwarf companion.
KW - Stars: individual (HD 89744)
KW - Stars: low-mass, brown dwarf
UR - http://www.scopus.com/inward/record.url?scp=11144349060&partnerID=8YFLogxK
U2 - 10.1002/asna.200410252
DO - 10.1002/asna.200410252
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AN - SCOPUS:11144349060
SN - 0004-6337
VL - 325
SP - 718
EP - 722
JO - Astronomische Nachrichten
JF - Astronomische Nachrichten
IS - 9
ER -