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The Tale of a Hungry Subgiant and Its Brown Dwarf: Interior Radiative Damping Dominates the Tidal Evolution of TOI-5882

  • Authors: Ritvik Sai Narayan, Melinda Soares-Furtado, Richard H. D. Townsend

Ritvik Sai Narayan et al 2026 The Astrophysical Journal Letters 1005 .

  • Provider: AAS Journals

Caption: Figure 4.

Angular-momentum luminosity ﹩\langle {{ \mathcal L }}_{J}\rangle ﹩ (black solid line) as a function of fractional stellar radius for the primary TOI-5882. To ensure consistency with Figures 2 and 3, these profiles are computed using the same stellar model, forced at the model-predicted orbital period of Porb ≈ 5.95 days. The right panel shows the GYRE-tides calculation with only radiative damping, while the left panel includes both radiative and viscous damping. The blue shaded region represents the gravitational component of the luminosity ﹩{\langle {{ \mathcal L }}_{J}\rangle }_{{\rm{grav}}}﹩ and the red shaded region shows the wave component ﹩{\langle {{ \mathcal L }}_{J}\rangle }_{{\rm{wave}}}﹩. The horizontal dashed line marks the surface value of ﹩\langle {{ \mathcal L }}_{J}\rangle ﹩, which is equal and opposite to the net torque ﹩\langle { \mathcal T }\rangle ﹩ on the star. The hatched region shows the convective zone of the star and the orange shaded zone represents the hydrogen-burning shell.

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