AAS 201st Meeting, January, 2003
Session 46. Planetary Systems: Observations and Models
Poster, Tuesday, January 7, 2003, 9:20am-6:30pm, Exhibit Hall AB

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[46.13] Long baseline interferometric observations of HD~195019: no K dwarf companion detected

C.D. Koresko (Interferometry Science Ceneter, Caltech), B. Mennesson (JPL, Caltech), A.F. Boden, R.L. Akeson (Interferometry Science Ceneter, Caltech), D.A. Fischer (UC, Berkeley), R.P. Butler (DTM, CIW), G.W. Marcy (UC, Berkeley), S.S. Vogt (UCO/Lick Observatory)

Radial velocity measurements of the G3 V/IV star HD 195019 revealed the presence of an orbiting companion with m sin i = 3.5 Jupiter masses and a period of 18 days (Fischer et al. 1999). A subsequent search for astrometric wobble using Hipparcos data suggested that the companion may be a K dwarf star with a mass of 0.7 Msun in a nearly pole-on orbit (Han et al. 2001). Here we present new visibility measurements obtained at the Palomar Testbed Interferometer which rule, out at the 99% confidence level, any companion in an orbit consistent with the spectroscopic data and having more than 2% of the flux of the primary star in the near-infrared K band. This upper flux limit corresponds to an upper mass limit of 0.35 Msun for the companion.

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© 2002. The American Astronomical Soceity.