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Leveraging Impact Parameter to Mitigate the Transit Light Source Effect: Early Insights from TRAPPIST-1

  • Authors: Ana Glidden, Alexander I. Shapiro, Sara Seager, Nadiia Kostogryz, Valeriy Vasilyev, Roeland P. van der Marel, J. de Wit, Benjamin V. Rackham, Prajwal Niraula, Natalie H. Allen, Jingcheng Huang, Nikole K. Lewis, Zifan Lin, Jacob Lustig-Yaeger, Ryan J. MacDonald, Brett M. Morris, Elijah Mullens, Kevin B. Stevenson, Jeff A. Valenti, Daniel Valentine, Hannah R. Wakeford, C. Matt Mountain

Ana Glidden et al 2026 The Astrophysical Journal Letters 1008 .

  • Provider: AAS Journals

Caption: Figure 2.

The maximum peak-to-peak amplitude of the TLS effect over a range of impact parameters and spot-coverage fractional differences between the polar and equatorial regions for our fiducial two-zone model. As a representative example, we assume cold spots (ΔT = −100 K) and an equatorial band up to 15∘. We fix fpole to 0.5 and allow feq to range from 0 to 0.5. The inner (low-b) planets demonstrate up to ∼2 ×  the TLS as the outer planets.

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