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

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.

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Publication Details

Journal
Maryland Shared Open Access Repository (USMAI Consortium)
Published
2025-12-01
DOI
https://doi.org/10.13016/m2revn-dsxr
Primary Topic
Stellar, planetary, and galactic studies
Type
article
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article

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

Roeland P. van der Marel, Kevin B. Stevenson, Ryan C. Challener, Ana Glidden et al.
Maryland Shared Open Access Repository (USMAI Consortium)
Stellar, planetary, and galactic studies
article

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

Roeland P. van der Marel, Kevin B. Stevenson, Ryan C. Challener, Ana Glidden, Kristin S. Sotzen, Lili Alderson, Zifan Lin, Shang-Min Tsai, Edward W. Schwieterman, Jingcheng Huang, Nikole K. Lewis, Thomas J. Fauchez, Jeff A. Valenti, Consortium on Habitability, Atmospheres of M.-dwarf Planets (CHAMPs), Marshall Perrin, Natalie H. Allen, L. C. Mayorga, Dana R. Louie, C. Matt Mountain, Elijah Mullens, Sarah Peacock, Sarah M. Hörst, Daniel Valentine, Jacob Lustig-Yaeger, Amélie Gressier, Avi M. Mandell, Jayesh Goyal, Hannah R. Wakeford
article en

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.

Maryland Shared Open Access Repository (USMAI Consortium)
Openalex Percentile: Top 26%
Stellar, planetary, and galactic studies
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Non-detection of Nightside Emission from HAT-P-26b due to Stellar Contamination — Roeland P. van der Marel, Kevin B. Stevenson, et al. · Maryland Shared Open Access Repository (USMAI Consortium) (2025) | TGRS Research Map | TGRS