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Closely Matched Dither Positions in Science-reference Frame Pairs Can Prevent False Positives with JWST MIRI Direct Imaging

  • Authors: Sam Hopper, Rachel Bowens-Rubin

Sam Hopper and Rachel Bowens-Rubin 2026 Research Notes of the AAS 10 .

  • Provider: AAS Journals

Caption: Figure 1.

Performance Results of Wolf 359 Dither Pairings. Top. Four subtracted PSFs of 2025 April Wolf 359 dither 4 paired with 2024 December Wolf 359 dither 1 (leftmost) through 4 (rightmost) with their pixel position difference labeled above. As pixel position difference between dithers decreases the wavefront error improves, especially for separations inwards of ∼10–15 pixels. Bottom. The computed apparent F2100W magnitude contrast curves as a function of separation in pixels and arcseconds. Singular dither pairings (dotted lines) pixel differences are represented by the color bar, where the redder the color, the smaller the pixel difference. An inverse variance weighting of the four smallest pixel difference pairings (solid black line) and the four largest pixel difference pairings (solid orange line) are also displayed. By closely matching the dithers, the contrast improves by an average of ∼0.9 ± 0.2 mag across the 0﹩\mathop{.}\limits^{^{\prime\prime} }﹩5–4﹩\mathop{.}\limits^{^{\prime\prime} }﹩4 range.

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