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Kinematics of the SWEEPS transiting planet candidates

  • Will Clarkson (a1), Kailash Sahu (a1), Jay Anderson (a2), T. Ed Smith (a1), Thomas M. Brown (a1), Stefano Casertano (a1), R Michael Rich (a3), Howard E. Bond (a1), Mario Livio (a1), Dante Minniti (a4), Nino Panagia (a1), Alvio Renzini (a5), Jeff Valenti (a1) and Manuela Zoccali (a4)...

Abstract

In 2004 a deep sequence of HST images of the Bulge was used to identify sixteen transiting extrasolar planet candidates (the SWEEPS candidates; Sahu et al. 2006), of which at least seven are likely to be true planets. Of these, SWEEPS-4 is almost certainly in the disk, and was shown through radial velocity followup to contain a planetary companion; the identification of the remaining fifteen candidates was left undetermined.

We have used a repeat visit in 2006 to attach proper motions to some 180,000 objects, including all sixteen SWEEPS candidates. This has allowed us to build a sample of bulge stars to unprecedented purity. A population of more than 13,000 bulge objects is kinematically isolated, with fewer than thirty disk contaminants. We use the mean bulge and disk populations to test the balance of kinematic associations for the sixteen SWEEPS candidates. Assuming both the detectability and the astrophysical false-positive fraction to be similar for disk and bulge, we find the fraction of stars with planets in the bulge to be consistent with that in the disk.

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References

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Clarkson, W. I., Sahu, K. C., Anderson, J. et al. 2008 ApJ accepted http://www.stsci.edu/~clarkson/pm12/pm12.ps.gz
Kuijken, K. & Rich, R. M. 2002, AJ 124, 2054
Metchev, S. A. & Grindlay, J. E. 2002, MNRAS 335, 73
Rich, R.M., Reitzel, D.B., Howard, C.D, Zhao, H-S. 2007, ApJ 658, L29
Sahu, K.C. et al. , 2006, Nature 443, 534
Vieira, K. et al. , 2007 AJ 134, 1432
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Kinematics of the SWEEPS transiting planet candidates

  • Will Clarkson (a1), Kailash Sahu (a1), Jay Anderson (a2), T. Ed Smith (a1), Thomas M. Brown (a1), Stefano Casertano (a1), R Michael Rich (a3), Howard E. Bond (a1), Mario Livio (a1), Dante Minniti (a4), Nino Panagia (a1), Alvio Renzini (a5), Jeff Valenti (a1) and Manuela Zoccali (a4)...

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