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Revised Mass and Orbit of ε Eridani b: A 1 MJup Planet on a Near-circular Orbit

  • Authors: William Thompson, Eric L. Nielsen, Jean-Baptiste Ruffio, Sarah Blunt, Christian Marois

William Thompson et al 2025 The Astronomical Journal 170 .

  • Provider: AAS Journals

Caption: Figure 2.

A comparison between posteriors from the seven orbit models, listed in the legend. We find no obvious discrepancy between any data set. The bottom-left panel is a corner plot, and the top-right panel shows the predicted location on 2025 January 1, near the planet’s maximum separation from the star and the epoch of recent JWST observations. All contours encompass the volume contained within the 1σ two-dimensional Gaussian equivalent. The inclination and position angle of the outer disk model from M. Booth et al. (2023) fitted to ALMA data is overplotted as dashed lines. The ❉ indicates two models containing only RV data and only absolute astrometry data, respectively, and whose posteriors are therefore completely independent. The models indicated by ✦ include RV data, but distinct sets of astrometric data, making the position angles effectively independent. The posterior represented by black contours include all available RV and astrometric data. We draw the reader’s attention in particular to the Ω vs. i and Ω vs. m subpanels, which illuminate how each data source progressively constrains the orientation of the orbit.

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