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Article overview
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The Frequency of Large Radius Hot and Very Hot Jupiters in omega Centauri | | David T F Weldrake
; Penny D Sackett
; Terry J Bridge
; | | Date: |
18 Oct 2007 | | Abstract: | We present the results of a deep, wide-field search for transiting ’Hot
Jupiter (HJ)’ planets in the globular cluster omega Centauri. As a result of a
25-night observing run with the ANU 40-inch telescope at Siding Spring
Observatory, a total of 109,726 stellar time series composed of 787 independent
data points were produced with differential photometry in a 52x52’ (0.75 deg^2)
field centered on the cluster core, but extending well beyond. Taking into
account the size of transit signals as a function of stellar radius, 45,406
stars have suitable photometric accuracy (<=0.045 mag to V=19.5) to search for
transits. Of this sample, 31,000 stars are expected to be main sequence cluster
members. All stars, both cluster and foreground, were subjected to a rigorous
search for transit signatures; none were found. Extensive Monte Carlo
simulations based on our actual data set allows us to determine the sensitivity
of our survey to planets with radii ~1.5R_Jup, and thus place statistical upper
limits on their occurrence frequency ’F’. Smaller planets are undetectable in
our data. At 95% confidence, the frequency of Very Hot Jupiters (VHJs) with
periods P satisfying 1d<P<3d can be no more than F_VHJ < 1/1040 in omega Cen.
For HJ and VHJ distributed uniformly over the orbital period range 1d<P<5d,
F_VHJ+HJ < 1/600. Our limits on large, short-period planets are comparable to
those recently reported for other Galactic fields, despite being derived with
less telescope time. | | Source: | arXiv, 0710.3461 | | Services: | Forum | Review | PDF | Favorites | |
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