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A Spitzer Space Telescope Exploration Science Program to Search for Y-dwarf Variability

  • Authors: Michael C. Cushing, Jesica L. Trucks, Kevin K. Hardegree-Ullman, Adam J. Burgasser, Sean J. Carey, Jonathan J. Fortney, Christopher R. Gelino, John E. Gizis, J. Davy Kirkpatrick, Sandy Leggett, Gregory N. Mace, Mark S. Marley, Caroline V. Morley

Michael C. Cushing et al 2026 The Astronomical Journal 172 .

  • Provider: AAS Journals

Caption: Figure 2.

Epoch 1 periodograms for the 16 Y dwarfs in our sample. The gray dashed lines give the 5% (95% confidence) false alarm levels, which give the power levels above which we would expect to see power less than 5% of the time under the null hypothesis of pure Gaussian noise (no variable signal). Any object with power in its periodogram above this level is considered variable.

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