期刊
ASTRONOMY & ASTROPHYSICS
卷 425, 期 1, 页码 249-253出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20041009
关键词
stars : low-mass, brown dwarfs; stars : planetary systems
We report on the detection of a new low-mass stellar companion of HD 75289, a GOV 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 Soft detection limit we can rule out additional stellar companions beyond 140 AU and substellar companions with masses m greater than or equal to 0.050 M-circle dot from 400 AU up to 2000 AU.
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