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Updated Mutual Inclination Measurement for 14 Her b and c

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arxiv 2506.13580 v1 pith:64BSZ7IH submitted 2025-06-16 astro-ph.EP

Guang-Yao Xiao , Fabo Feng This is my paper
classification astro-ph.EP
keywords astrometrycircinclinationmutualorbitalsystemabsoluteadditional
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abstract

The mutual inclination $\psi$ between orbits within multi-planetary systems is difficult to measure directly. Through a joint analysis of RVs, Hipparcos-Gaia absolute astrometry and relative astrometry of JWST, \citet{Bardalez2025} recently found two possible values of $\psi_{bc}={32_{-15.1}^{+13.6}}^{\circ}$ and $\psi_{bc}={145.0_{-11.1}^{+15.8}}^{\circ}$ for the nearby, non-transit planet system, 14\,Her. By incorporating additional astrometry from Gaia second data release (DR2), we have further constrained the orbital orientation of 14\,Her\,b, resulting in a definitive and unambiguous mutual inclination of $\psi_{bc}={35.3_{-7.3}^{+6.8}}^{\circ}$. The unusual misaligned orbital architecture of 14\,Her system may serve as a benchmark for dynamical studies.

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