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arxiv: 1907.04897 · v1 · pith:J7H6SPO3new · submitted 2019-07-10 · 🌌 astro-ph.IM · astro-ph.EP

WAET: low-cost ground based telescopes for accelerated exoplanet direct imaging

Benjamin Monreal , Dominic Oddo , Christian Rodriguez This is my paper

Pith reviewed 2026-05-24 23:14 UTC · model grok-4.3

classification 🌌 astro-ph.IM astro-ph.EP
keywords exoplanet direct imagingasymmetric apertureground-based telescopelow-cost instrumentsWAEThWAEToptical telescope designdirect imaging
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The pith

An extremely asymmetric 100-by-2 meter aperture delivers new exoplanet imaging reach for $150 million.

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

The paper proposes a ground-based telescope called WAET that uses an extremely asymmetric aperture shape instead of conventional round or symmetric designs. This layout is presented as a way to achieve improved direct imaging of exoplanets while keeping construction costs far below those of traditional large telescopes. The specific hWAET version, 100 meters long by 2 meters wide, is estimated to cost about 150 million dollars to build during the 2020s. Sympathetic readers would care because the design suggests a route to faster exoplanet discoveries from the ground without waiting for much larger budgets or space-based platforms.

Core claim

The WAET is a new ground-based optical telescope layout with an extremely asymmetric aperture, which results in new exoplanet imaging reach at very low cost. The authors suggest that hWAET, a 100x2 telescope, can be built for $150M in the 2020s, and >300m versions merit further R&D.

What carries the argument

The extremely asymmetric aperture layout of the WAET, which carries the argument for new imaging performance at low cost.

Load-bearing premise

The extremely asymmetric aperture delivers usable exoplanet imaging performance without major losses in light collection, resolution, or added technical difficulties.

What would settle it

A side-by-side simulation or on-sky test that measures the achieved contrast and inner working angle for exoplanet detection in the WAET design versus a conventional aperture of comparable total area or cost.

Figures

Figures reproduced from arXiv: 1907.04897 by Benjamin Monreal, Christian Rodriguez, Dominic Oddo.

Figure 1
Figure 1. Figure 1: WAET optical layout. Starlight (shown as coming from zenith) reflects once off a tilted [PITH_FULL_IMAGE:figures/full_fig_p004_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: Sky coverage and pointing parameters for two illustrative WAET site choices. In both [PITH_FULL_IMAGE:figures/full_fig_p006_2.png] view at source ↗
Figure 5
Figure 5. Figure 5: Left: A preliminary, unoptimized sky survey showing hWAET and kWAET discovery [PITH_FULL_IMAGE:figures/full_fig_p009_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: WAET cost scaling laws (2017 USD) as a function of area (top) or longest-dimension [PITH_FULL_IMAGE:figures/full_fig_p011_6.png] view at source ↗
read the original abstract

The Wide Aperture Exoplanet Telescope (WAET) is a new ground-based optical telescope layout with an extremely asymmetric aperture, which results in new exoplanet imaging reach at very low cost. We suggest that hWAET, a 100x2 telescope, can be built for $150M in the 2020s, and >300m versions merit further R&D.

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.

Referee Report

3 major / 0 minor

Summary. The manuscript proposes the Wide Aperture Exoplanet Telescope (WAET) concept featuring an extremely asymmetric aperture layout. It suggests that a 100 m × 2 m version (hWAET) can be built for $150M in the 2020s and delivers new exoplanet direct imaging reach at very low cost, with >300 m versions also meriting further R&D.

Significance. If the performance and cost claims were substantiated through analysis, the asymmetric-aperture approach could lower barriers to high-contrast imaging and enable more accessible facilities. The manuscript provides no such substantiation, so the assessed significance remains speculative.

major comments (3)
  1. [Abstract] Abstract: the central claim that the 100×2 m asymmetric aperture 'results in new exoplanet imaging reach' is stated without any derivation, simulation, PSF calculation, or contrast estimate to support it.
  2. [Abstract] Abstract: the $150M cost figure for hWAET and the implied performance advantage are presented with no supporting breakdown, error analysis, or comparison to the ~200 m² collecting area (equivalent to a ~16 m filled aperture).
  3. [Abstract] Abstract / main text: no analysis is given of the highly anisotropic PSF expected from a 100 m × 2 m rectangular aperture, nor of its compatibility with coronagraphs or differential-imaging methods needed to reach 10^{-7}–10^{-8} contrast at 0.5–2 arcsec.

Simulated Author's Rebuttal

3 responses · 0 unresolved

We thank the referee for their review and the opportunity to respond. Our manuscript presents a conceptual proposal for the WAET architecture rather than a detailed engineering study. We address each major comment below.

read point-by-point responses

  1. Referee: [Abstract] Abstract: the central claim that the 100×2 m asymmetric aperture 'results in new exoplanet imaging reach' is stated without any derivation, simulation, PSF calculation, or contrast estimate to support it.

    Authors: The manuscript is framed as a high-level concept paper introducing the asymmetric-aperture idea and its potential for low-cost exoplanet imaging. The central claim is presented as a motivation for further R&D rather than a substantiated performance prediction. Detailed derivations, simulations, and contrast estimates are acknowledged as necessary next steps but lie outside the scope of this initial proposal. revision: no

  2. Referee: [Abstract] Abstract: the $150M cost figure for hWAET and the implied performance advantage are presented with no supporting breakdown, error analysis, or comparison to the ~200 m² collecting area (equivalent to a ~16 m filled aperture).

    Authors: The $150M figure is an order-of-magnitude estimate intended to convey the low-cost potential relative to conventional filled apertures of comparable collecting area. No detailed breakdown or error analysis is provided because the paper focuses on the novel aperture geometry rather than a full cost model. The equivalent collecting area is implicit in the stated dimensions and can be noted explicitly if required. revision: no

  3. Referee: [Abstract] Abstract / main text: no analysis is given of the highly anisotropic PSF expected from a 100 m × 2 m rectangular aperture, nor of its compatibility with coronagraphs or differential-imaging methods needed to reach 10^{-7}–10^{-8} contrast at 0.5–2 arcsec.

    Authors: The anisotropic PSF and coronagraph compatibility are recognized as critical technical issues that would require dedicated analysis. The manuscript introduces the aperture concept at a conceptual level with the expectation that such studies would follow. A short paragraph acknowledging these open questions can be added in revision if the editor considers it essential for clarity. revision: partial

Circularity Check

0 steps flagged

No circularity: concept paper with no derivations or equations

full rationale

The provided abstract and description contain no equations, derivations, fitted parameters, or load-bearing self-citations. The central claim is a cost and performance suggestion for an asymmetric aperture telescope, presented without any mathematical chain that could reduce to its inputs by construction. No self-definitional steps, fitted-input predictions, or ansatz smuggling are present. This is a normal non-finding for a high-level concept paper.

Axiom & Free-Parameter Ledger

1 free parameters · 0 axioms · 1 invented entities

Abstract-only review provides no detailed parameters, axioms, or entities; the cost figure and performance claim appear as unelaborated suggestions.

free parameters (1)
  • hWAET construction cost
    The $150M figure is stated without breakdown or justification in the abstract.
invented entities (1)
  • WAET asymmetric aperture layout no independent evidence
    purpose: To achieve new exoplanet imaging reach at low cost
    Newly proposed telescope geometry with no independent evidence cited in abstract.

pith-pipeline@v0.9.0 · 5584 in / 1185 out tokens · 27030 ms · 2026-05-24T23:14:17.893286+00:00 · methodology

discussion (0)

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Reference graph

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