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A Century of Radial-velocity and Astrometric Monitoring of 70 Oph AB: New PFS Data and Constraints on Possible Planetary Companions

  • Authors: Yiting Li, Michael R. Meyer, Skylar D'Angiolillo, Stephen R. Kane, R. Paul Butler, Stephen A. Shectman, Eric E. Mamajek, Johanna Teske, Jack Lubin, Paul Robertson, Jessie L. Christiansen, Howard Isaacson, Caleb K. Harada, Bradford Holden, William D. Cochran, Michael Endl, Jennifer Burt, Juliette Becker, Alyssa Jankowski, Peter Tuthill, Catherine A. Clark, Rachael M. Roettenbacher, Eric Nielsen, Eduardo Bendek, Armen Tokadjian, William Roberson, Kaitlin M. Kratter, Edwin Bergin, Dave Osip, Jeffrey D. Crane, Alex Davis, Gautam Vasisht

Yiting Li et al 2026 The Astrophysical Journal 1009 .

  • Provider: AAS Journals

Caption: Figure 11.

Posterior distributions for the QP GP activity model fit to the RVs of 70 Oph A. The GP hyperparameters include the amplitude (η1), exponential decay timescale (η2), periodic timescale (η3), and coherence scale (η4). Instrument-specific velocity offsets (γ) and jitter terms (σ) for Keck/HIRES, PFS, APF, and McDonald are also shown. The diagonal panels show the marginalized posterior distributions, while the off-diagonal panels display the joint posterior correlations. The periodic timescale is tightly constrained at ∼19.8 days, consistent with stellar rotation.

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