Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008dps....40.0408b&link_type=abstract
American Astronomical Society, DPS meeting #40, #4.08; Bulletin of the American Astronomical Society, Vol. 40, p.393
Astronomy and Astrophysics
Astronomy
Scientific paper
We present a progress report on our ongoing efforts to produce actual exoplanet masses (as opposed to M sin i). We obtain masses through astrometry of host star perturbations. The Fine Guidance Sensors aboard Hubble Space Telescope provide millisecond of arc per observation precision. Our five targets include HD 38529, HD 47536, HD 136118, HD 145675, and HD 168443. Specific results presented at this meeting will include masses for components of HD 47536 and HD 136118 (Martioli et al. 2008, in preparation). Published radial velocities and high-cadence velocities from the Hobby-Eberly Telescope permit us to characterize the orbits of companions with periods far longer than our roughly 2 year span of HST data. These velocities also occasionally yield previously unknown companions, which, if not properly taken into account, would have introduced noise into our simultaneous astrometry-radial velocity modeling. This project originally had six host star targets. HST astrometry of the first of these, HD 33636 (Bean et al. 2007, AJ, 134, 749), identified the presumed planetary mass companion HD 33636 b as an M dwarf star, HD 33636 B.
This work is supported by NASA through the Space Telescope Science Institute General Observer program grants: GO-09407, -09971, -10103, -10610, -10989, and -11210.
Armstrong Andrew
Bean Jacob L.
Benedict George F.
Martioli Eder
McArthur Barbara E.
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