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High-resolution Dayside Spectroscopy of the Ultrahot Jupiter WASP-178 b with Gemini South/GHOST

  • Authors: Caitlin E. Bell, Emily K. Deibert, Adam B. Langeveld, Ernst de Mooij, Ray Jayawardhana, Laura Flagg, Jake D. Turner

Caitlin E. Bell et al 2026 The Astronomical Journal 172 .

  • Provider: AAS Journals

Caption: Figure 8.

The results of cross correlating our data with the Ca model. The subplots are as described in the caption of Figure 5, though note that the color bar scales are not the same as in Figure 5. Although the individual nights and arms do not yield a peak correlation near the expected location of the planetary signal, we find that the combination of the blue and red arms in the first night of observations (top-right plot) along with the combination of both cameras and both nights (bottom-right plots) yield tentative detections >3σ near the expected planetary location. In particular, the final combined significance of the correlation peak is 4.3σ at ﹩{K}_{{\rm{p}}}=167.{0}_{-2.9}^{+6.0}﹩ km s−1 and RV = 0.1﹩{}_{-4.8}^{+2.0}﹩ km s−1.

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