SIMBAD references

2008ApJ...674.1117W - Astrophys. J., 674, 1117-1129 (2008/February-3)

The frequency of large-radius hot and very hot Jupiters in ω Centauri.

WELDRAKE D.T.F., SACKETT P.D. and BRIDGES T.J.

Abstract (from CDS):

We present the results of a deep, wide-field search for transiting hot Jupiter (HJ) planets in the globular cluster ω Centauri. As a result of a 25 night observing run with the ANU 40 inch (1 m) 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 52'x52' (0.75 deg2) 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 allow us to determine the sensitivity of our survey to planets with radii ∼1.5 RJup 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 1 day<P<3 days can be no more than FVHJ<1/1040 in ω Cen. For HJs and VHJs distributed uniformly over the orbital period range 1 day<P<5 days, FVHJ+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.

Abstract Copyright:

Journal keyword(s): Galaxy: Globular Clusters: Individual: NGC Number: NGC 5139 - Galaxy: Globular Clusters: Individual: Name: ω Centauri - Stars: Planetary Systems - Techniques: Photometric

Simbad objects: 7

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