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WASP-4b Arrived Early for the TESS Mission

  • Authors: L.G. Bouma, J.N. Winn, C. Baxter, W. Bhatti, F. Dai, T. Daylan, J.-M. Désert, M.L. Hill, S.R. Kane, K.G. Stassun, J. Villasenor, G.R. Ricker, R. Vanderspek, D.W. Latham, S. Seager, J.M. Jenkins, Z. Berta-Thompson, K. Colón, M. Fausnaugh, Ana Glidden, N. Guerrero, J.E. Rodriguez, J.D. Twicken, and B. Wohler

2019 The Astronomical Journal 157 217.

  • Provider: AAS Journals

Caption: Figure 8.

There is no evidence for a systematic offset between TESS times and the barycentric reference. While the WASP-4b transits fell about 82 s earlier than expected, other well-observed hot Jupiters, in particular WASP-6b and WASP-18b, arrived on time. Ticks are observed TESS transit midtimes; the orange distribution is a Gaussian centered on zero with standard deviation (﹩{\sigma }_{\mathrm{pre} \mbox{-} {TESS}}﹩) calculated from the pre-TESS transit times. The blue distribution is a Gaussian centered on the weighted average of the TESS times, with width equal to the uncertainty in the mean, that is, the standard deviation of the TESS residual times divided by ﹩\sqrt{N-1}﹩, with N the number of transits.

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