Non-detection of Nightside Emission from HAT-P-26b due to Stellar Contamination

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https://iopscience.iop.org/article/10.3847/2515-5172/ae2fdc

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https://doi.org/10.3847/2515-5172/ae2fdc
 http://hdl.handle.net/11603/41578

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UMBC Center for Space Sciences and Technology (CSST) / Center for Research and Exploration in Space Sciences & Technology II (CRSST II)

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https://orcid.org/0000-0002-1046-025X

Date

2025-12

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journal articles
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Citation of Original Publication

Sotzen, Kristin S., Jacob Lustig-Yaeger, Kevin B. Stevenson, et al. “Non-Detection of Nightside Emission from HAT-P-26b Due to Stellar Contamination.” Research Notes of the AAS 9, no. 12 (2025): 352. https://doi.org/10.3847/2515-5172/ae2fdc.

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This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.
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Abstract

We report a non-detection of nightside emission from the warm super-Neptune HAT-P-26 b. Following a similar approach to that presented by J. Lustig-Yaeger et al. for WASP-17 b, we attempted to extract the nightside emission spectrum using the in-eclipse spectrum removal method to detect planetary infrared excess (PIE). However, our methods did not yield a reliable nightside spectrum for HAT-P-26 b, and instead the results appear consistent with contamination due to small changes in the star between transit and eclipse visits. This null result helps to illuminate astrophysical challenges that complicate applications of the PIE technique and highlight the need for close-in-time transit and eclipse observations for this analysis method.