TY - JOUR
T1 - A low-mass stellar companion of the planet host star HD 75289
AU - Mugrauer, M.
AU - Neuhäuser, R.
AU - Mazeh, T.
AU - Alves, J.
AU - Guenther, E.
PY - 2004/10
Y1 - 2004/10
N2 - We report on the detection of a new low-mass stellar companion of HD 75289, a G0V star that harbors one known radial-velocity planet (Udry et al. 2000, A&A, 356, 590). Comparing an image from 2MASS with an image we obtained with SofI at the ESO 3.58 m NTT three years later, we detected a co-moving companion located 21.465±0.023 arcsec (621±10 AU at 29 pc) east of HD 75289. A second SofI image taken 10 months later confirmed the common proper motion of HD 75289 B with its host star. The infrared spectrum and colors of the companion are consistent with an M 2 to M 5 main-sequence star at the distance of HD 75289. No further (sub)stellar companion down to H = 19 mag could be detected. With the SofI detection limit we can rule out additional stellar companions beyond 140 AU and substellar companions with masses m ≥ 0.050 M≥ from 400 AU up to 2000 AU.
AB - We report on the detection of a new low-mass stellar companion of HD 75289, a G0V star that harbors one known radial-velocity planet (Udry et al. 2000, A&A, 356, 590). Comparing an image from 2MASS with an image we obtained with SofI at the ESO 3.58 m NTT three years later, we detected a co-moving companion located 21.465±0.023 arcsec (621±10 AU at 29 pc) east of HD 75289. A second SofI image taken 10 months later confirmed the common proper motion of HD 75289 B with its host star. The infrared spectrum and colors of the companion are consistent with an M 2 to M 5 main-sequence star at the distance of HD 75289. No further (sub)stellar companion down to H = 19 mag could be detected. With the SofI detection limit we can rule out additional stellar companions beyond 140 AU and substellar companions with masses m ≥ 0.050 M≥ from 400 AU up to 2000 AU.
KW - Stars: low-mass, brown dwarfs
KW - Stars: planetary systems
UR - http://www.scopus.com/inward/record.url?scp=4744348280&partnerID=8YFLogxK
U2 - 10.1051/0004-6361:20041009
DO - 10.1051/0004-6361:20041009
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AN - SCOPUS:4744348280
SN - 0004-6361
VL - 425
SP - 249
EP - 253
JO - Astronomy and Astrophysics
JF - Astronomy and Astrophysics
IS - 1
ER -