A Mass for the Extrasolar Planet ɛ Eri b

Details A Mass for the Extrasolar Planet ɛ Eri b A Mass for the Extrasolar Planet ɛ Eri b

Nov 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004dps....36.4202b&link_type=abstract

American Astronomical Society, DPS meeting #36, #42.02; Bulletin of the American Astronomical Society, Vol. 36, p.1172

Astronomy and Astrophysics

Astronomy

Scientific paper

Using FGS 1r, a white-light interferometer on HST, we carried out narrow-field relative astrometry of ɛ Eri, a star possibly hosting a planetary mass companion (Hatzes et al. 2000, ApJL,544, 145). Following the approach used to establish the mass of the extrasolar planet Gl 876 b (Benedict et al. 2002, ApJL, 581, 115), we combine three years of HST astrometric observations with ground-based primary star high-precision radial velocities from McDonald, Lick, and CFHT Observatories, spanning more than one companion period. Unlike our previous approach, this study also includes ground-based, lower per-observation precision astrometry. Nearly fifteen years of Allegheny Observatory MAP data considerably extend our time span. At a minimum, these data improve the precision of our final proper motion, a signature, along with parallax, that must be removed to yield orbital acceleration. We present the major result of our final analysis, the mass of ɛ Eri b.
The 'Are These Planets or Not?' Team for this particular object consists of the authors and co-I's; A. Hatzes, W. Cochran, G. Marcy, P. Butler, G. Walker, and B. Campbell. This research is supported by grant GO-9969 from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA

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