A low-mass stellar companion of the planet host star HD 75289
- Author(s)
- M. Mugrauer, R. Neuhäuser, T. Mazeh, J. Alves, E. Guenther
- Abstract
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. \cite{Udry00}, 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.
Based on observations obtained on La Silla in ESO programs 68.C-008 and
70.C-0116(A).
- Organisation(s)
- Department of Astrophysics
- External organisation(s)
- Thüringer Landessternwarte Tautenburg, European Southern Observatory (Germany), Friedrich-Schiller-Universität Jena, Tel Aviv University
- Journal
- Astronomy & Astrophysics
- Volume
- 425
- Pages
- 249-253
- ISSN
- 0004-6361
- DOI
- https://doi.org/10.1051/0004-6361:20041009
- Publication date
- 10-2004
- Peer reviewed
- Yes
- Keywords
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/d8613da5-52be-4830-86e2-9ec97a66edbc