arxiv: 2604.02405 · v2 · submitted 2026-04-02 · 🌌 astro-ph.IM · gr-qc

Recognition: no theorem link

Site selection constraints and options for LILA-Pioneer and LILA-Horizon

James Trippe , Ronald Polidan , Teviet Creighton , Philippe Lognonn\'e , Mark Panning , Volker Quetschke , Kris Izquierdo , Brett Shapiro

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Karan Jani

Authors on Pith no claims yet

Pith reviewed 2026-05-13 20:39 UTC · model grok-4.3

classification 🌌 astro-ph.IM gr-qc

keywords Moongravitational wavessite selectionLILAlunar interferometerdeciHz gravitational waveslunar instrumentation

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The pith

Many viable sites on the Moon exist for both LILA-Pioneer and LILA-Horizon gravitational wave detectors.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper examines where on the lunar surface the LILA instruments can be placed. It shows that the low-frequency nature of the deciHz gravitational wave signals allows the Moon's natural precession to provide triangulation, so exact location does not affect the core science return. Practical limits still apply, such as distance from human activity, shielding from dust and temperature swings, access by rovers, and clear communication paths. The analysis identifies multiple candidate locations that satisfy these limits for both the simpler L-shaped Pioneer strainmeter and the more advanced triangular Horizon interferometer.

Core claim

Candidate sites are shown for both LILA-Pioneer and LILA-Horizon, demonstrating that many options exist for deployment of both tools, because the detection frequency is low enough that the Moon's precession around the Earth and Sun suffices for triangulation without site-specific requirements.

What carries the argument

The practical constraints of isolation from anthropogenic noise, protection from the lunar environment, accessibility for lunar terrain vehicles, and line-of-sight communications, which restrict but do not eliminate possible deployment locations.

If this is right

The LILA project concepts remain feasible because multiple sites meet the operational requirements for either instrument.
LILA-Pioneer can be placed at several locations given its simpler L-shaped layout.
LILA-Horizon's triangular geometry also has multiple suitable sites that preserve line-of-sight and access.
Site choice does not limit the ability to use lunar precession for source localization.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

The same constraint categories could be applied to site selection for other long-baseline lunar instruments.
The existence of many options may allow planners to prioritize secondary factors such as scientific synergy with other lunar missions.
Future expansions of the LILA array could draw from the same pool of candidate regions without new site surveys.

Load-bearing premise

The listed practical considerations are the dominant constraints and the identified candidate sites adequately satisfy them for long-term operation.

What would settle it

A survey or measurement showing that every listed candidate site fails at least one constraint, such as excessive seismic noise from future lunar activity or blocked line-of-sight to Earth.

Figures

Figures reproduced from arXiv: 2604.02405 by Brett Shapiro, James Trippe, Karan Jani, Kris Izquierdo, Mark Panning, Philippe Lognonn\'e, Ronald Polidan, Teviet Creighton, Volker Quetschke.

**Figure 1.** Figure 1: Geometry used in calculation of the altitude (a) that detector S1 needs to sit above S2. M is the center of the Moon, R is the radius of the Moon, L is the arm length of the detector, θ is the additional angle of inclination desired above the tangent to give margin, H is the horizon point with no margin, and h is the height of H. detectors (e.g. Laser Interferometer Gravitational Observatory (LIGO)) [7, 8,… view at source ↗

**Figure 2.** Figure 2: Sites found in the search using the required criteria from Section 2.8. Red circles indicate possible LILA-Pioneer sites while blue indicates possible LILA-Horizon sites. The green lines indicate arm distributions extending from a single vertex. An example demployment using the Monge crater data point is shown in [PITH_FULL_IMAGE:figures/full_fig_p007_2.png] view at source ↗

**Figure 3.** Figure 3: Example zoom-in of the Monge site to illustrate a deployment of LILA-Pioneer. The primary instrument lies at the vertex of the triangle, marked with a black box. The retroreflectors are placed via rover 5 km apart at a 55◦ angle. The primary instrument lays about 500m above the two retroreflectors. 4. Discussion Many sites for LILA-Pioneer were found that satisfied the required considerations and give seve… view at source ↗

read the original abstract

The Earth's Moon presents a uniquely advantageous environment for detecting astrophysical gravitational waves (GWs), particularly in the scientifically interesting deciHz regime. The Laser Interferometer Lunar Antennae (LILA) project plans to perform GW measurements on the lunar surface, using the Moon's unique seismic quietness to access the deciHz regime. Two mission concepts are considered: the initial LILA-Pioneer L-shaped strainmeter and the more advanced LILA-Horizon triangular interferometer. Because the detection frequency is so low, LILA requires only the Moon's precession around the Earth and Sun to triangulate (unlike Earth-based detectors). Thus, the science return of LILA is site-agnostic; however, significant constraints are imposed by practical considerations. These include the need for isolation from anthropogenic noise, protection from the lunar environment, accessibility for lunar terrain vehicles, and line-of-sight. Candidate sites are shown for both LILA-Pioneer and LILA-Horizon, demonstrating that many options exist for deployment of both tools.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Desk Editor's Note private letter to a colleague

This is a descriptive site survey showing multiple workable lunar locations for LILA but without quantitative verification of the constraints.

read the letter

The core point is that the LILA project has mapped out practical constraints for placing its gravitational wave instruments on the Moon and identified several candidate sites that appear to satisfy them for both the Pioneer L-shaped strainmeter and the Horizon triangular setup. The science case stays site-agnostic because the Moon's orbital motion around Earth and Sun supplies the triangulation needed at deciHz frequencies, so the paper rightly shifts focus to engineering limits like isolation from future human activity, protection from the environment, rover access, and line-of-sight needs. It does a clean job separating those two threads and concludes that deployment options are not scarce. That separation is useful and keeps the discussion grounded. The main limitation is depth. The work stays at the level of listing constraints and naming sites without supplying the actual measurements, noise budgets, terrain data, or stability checks that would let a reader judge how well the candidates really hold up over mission lifetimes. If the full text includes maps or supporting calculations, they are not prominent enough to change the high-level feel. This paper is aimed at lunar mission planners and instrument teams who need to know whether hardware placement is even feasible before deeper design work. It is not a scientific result that advances the field on its own, but it is a necessary planning step. I would send it to peer review so the community can check the site data and add any missing quantitative support before the project moves forward.

Referee Report

1 major / 0 minor

Summary. The manuscript presents a feasibility study for site selection of the LILA-Pioneer L-shaped strainmeter and LILA-Horizon triangular interferometer on the lunar surface for deciHz gravitational wave detection. It outlines practical constraints such as isolation from anthropogenic noise, protection from the lunar environment, accessibility for lunar terrain vehicles, and line-of-sight requirements. The paper identifies candidate sites for both instruments and concludes that numerous viable options exist for deployment, noting that the science return is independent of site due to the use of lunar precession for triangulation.

Significance. If the proposed candidate sites are verified to meet the specified constraints, this feasibility study would be significant for advancing the LILA project by illustrating the availability of numerous deployment options. It usefully distinguishes between science requirements, which are site-independent, and engineering constraints, providing a practical roadmap for site selection in lunar interferometry missions.

major comments (1)

Abstract and candidate sites discussion: The central claim that candidate sites exist and demonstrate many options is not supported by quantitative data, error analysis, or explicit verification that the sites satisfy constraints such as specific noise isolation levels or line-of-sight distances; the manuscript remains descriptive without these details.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for their constructive review. We agree that the manuscript would be strengthened by adding quantitative data, explicit verifications, and error analysis to support the identification of candidate sites. We will revise accordingly.

read point-by-point responses

Referee: Abstract and candidate sites discussion: The central claim that candidate sites exist and demonstrate many options is not supported by quantitative data, error analysis, or explicit verification that the sites satisfy constraints such as specific noise isolation levels or line-of-sight distances; the manuscript remains descriptive without these details.

Authors: We acknowledge that the current manuscript is largely descriptive in its presentation of sites. In the revised version we will add quantitative assessments for the listed candidate sites, including calculated noise isolation levels (based on distance from potential anthropogenic sources such as lunar bases or landers), explicit line-of-sight distance measurements, and available error estimates or uncertainty ranges. These additions will provide the explicit verification requested and more rigorously support the conclusion that multiple viable options exist. The sites were identified by applying the stated constraints to lunar topographic and environmental maps; we will now document the numerical outcomes of that process. revision: yes

Circularity Check

0 steps flagged

No significant circularity in descriptive feasibility study

full rationale

This manuscript is a purely descriptive enumeration of engineering constraints (anthropogenic noise isolation, environmental protection, LTV accessibility, line-of-sight) and a listing of candidate lunar sites for LILA-Pioneer and LILA-Horizon. No equations, fitted parameters, predictions, derivations, or self-citations appear in the load-bearing claims. The science-return site-agnosticism is stated separately from the practical constraints, and candidate sites are presented as options without any reduction to tautological inputs or prior self-referential results. The analysis is therefore self-contained with no circular steps.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

The central claim rests on the domain assumption that lunar seismic quietness enables deciHz GW detection and that the enumerated practical constraints are both necessary and sufficient to evaluate sites. No free parameters or invented entities are introduced.

axioms (1)

domain assumption The Moon's seismic quietness provides access to the deciHz gravitational wave regime
Invoked in the abstract as the basis for the LILA project.

pith-pipeline@v0.9.0 · 5507 in / 1181 out tokens · 39680 ms · 2026-05-13T20:39:25.898718+00:00 · methodology

discussion (0)

Forward citations

Cited by 1 Pith paper

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

Black Hole Binary Detection Landscape for the Laser Interferometer Lunar Antenna (LILA): Signal-to-Noise Calculations & Science Cases
astro-ph.HE 2026-05 unverdicted novelty 5.0

LILA can detect IMBH binaries at redshifts 20-30, IMRIs, and provide months-to-years early warnings with high-SNR events for gravity tests.

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