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Peer-reviewedCC BY 4.0Monthly Notices of the Royal Astronomical Society

Resolving power of effective rheologies of planetary interiors with an application to the Moon

  • Yeva Gevorgyan1
  1. 1King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900 ,
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Abstract

Layered viscoelastic interiors control the frequency dependence of planetary tidal dissipation, but repeated layered Love-number calculations are expensive in long-term orbital and spin integrations. Equivalent homogeneous rheologies provide a cheaper representation of the same response, but their effective parameters do not by themselves identify the interior layers they represent. We develop a local interpretation of such parameters by differentiating the layered-to-homogeneous construction about a fixed-geometry baseline, perturbing only selected layer rigidities and viscosities. We use the pole-residue representation of the degree-two Love number to construct a physical-to-effective transfer matrix. We then use its singular values, resolution matrix, and mode-dominance matrix to determine which physical perturbations are visible in the Love-number response and how they appear in effective-rheology coordinates. Applied to a five-layer lunar model, the full degree-two response is sensitive to seven of eight solid-layer rheological parameters. The single near-null direction is the inner-core rigidity, consistent with shielding by the fluid outer core and with the weak dependence of Love numbers on core elastic structure. Over the LLR frequency interval, fewer physical directions are visible. To first order, the elastic spring, isolated dashpot, and two Voigt elements reproduce the nine-pole response over this interval. Finite perturbations confirm the tangent prediction to within a few percent, with the validity radius limited by a nearly degenerate pair of long-timescale modes.

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Cite

BibTeXRIS
BibTeX
@article{gevorgyan2026resolving,
  title = {{Resolving power of effective rheologies of planetary interiors with an application to the Moon}},
  author = {Yeva Gevorgyan},
  journal = {Monthly Notices of the Royal Astronomical Society},
  year = {2026},
  month = oct,
  doi = {10.1093/mnras/stag2068},
  url = {https://academic.oup.com/mnras/advance-article/doi/10.1093/mnras/stag2068/9004092},
  note = {CC BY 4.0},
}
RIS
TY  - JOUR
TI  - Resolving power of effective rheologies of planetary interiors with an application to the Moon
AU  - Yeva Gevorgyan
PY  - 2026
DA  - 2026/10/28
JO  - Monthly Notices of the Royal Astronomical Society
DO  - 10.1093/mnras/stag2068
UR  - https://academic.oup.com/mnras/advance-article/doi/10.1093/mnras/stag2068/9004092
AB  - Layered viscoelastic interiors control the frequency dependence of planetary tidal dissipation, but repeated layered Love-number calculations are expensive in long-term orbital and spin integrations. Equivalent homogeneous rheologies provide a cheaper representation of the same response, but their effective parameters do not by themselves identify the interior layers they represent. We develop a local interpretation of such parameters by differentiating the layered-to-homogeneous construction about a fixed-geometry baseline, perturbing only selected layer rigidities and viscosities. We use the pole-residue representation of the degree-two Love number to construct a physical-to-effective transfer matrix. We then use its singular values, resolution matrix, and mode-dominance matrix to determine which physical perturbations are visible in the Love-number response and how they appear in effective-rheology coordinates. Applied to a five-layer lunar model, the full degree-two response is sensitive to seven of eight solid-layer rheological parameters. The single near-null direction is the inner-core rigidity, consistent with shielding by the fluid outer core and with the weak dependence of Love numbers on core elastic structure. Over the LLR frequency interval, fewer physical directions are visible. To first order, the elastic spring, isolated dashpot, and two Voigt elements reproduce the nine-pole response over this interval. Finite perturbations confirm the tangent prediction to within a few percent, with the validity radius limited by a nearly degenerate pair of long-timescale modes.
SN  - 0035-8711
SN  - 1365-2966
ER  -