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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 3.

Degeneracy between filling-factor differences between the polar and equatorial regions and the temperature contrast (Figure 1). Each curve shows the error in transit depth due to the TLS effect for an assumed polar filling factor (fpole; line color) and equatorial filling factor (feq; line style). For example, the solid yellow line has 100% filling factor at the poles (yellow) and 10% filling factor at the equator (solid line). This degeneracy makes it challenging to fit simple temperature and filling-factor models with observed data.

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