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arxiv: 2604.13152 · v1 · submitted 2026-04-14 · 🌌 astro-ph.GA

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Persephone's Torch: A 15th Magnitude Quadruply-Lensed Quasar From the Couch Discovered with SPHEREx and the LBT

Arpita Ganguly, Eduardo Ba\~nados, Frederick B. Davies, Jennifer Power, Jon Rees, Sarah E. I. Bosman, Silvia Belladitta

Authors on Pith no claims yet

Pith reviewed 2026-05-10 14:35 UTC · model grok-4.3

classification 🌌 astro-ph.GA
keywords lensed quasargravitational lensingquadruply lensed quasarSPHERExadaptive optics imagingmicrolensingPersephone's TorchJ1330-0905
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The pith

A quadruply-lensed quasar at redshift 2.22 is confirmed as the brightest such system known, with four images and total magnification near 56.

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

The paper establishes the spectroscopic and geometric confirmation of J1330-0905, named Persephone's Torch, as an extremely bright quadruply-lensed quasar at z=2.22 with apparent magnitude i=14.77. Public spectrophotometry from the SPHEREx mission identifies the quasar nature and redshift, while adaptive optics imaging from the Large Binocular Telescope resolves four images in a compact circular kite configuration with an Einstein radius of about 0.45 arcseconds. An elliptical power-law lens model plus external shear reproduces the image positions and forecasts the high magnification, though the observed flux ratios deviate strongly from predictions. The short predicted time delays of at most two days position the system as a strong target for microlensing investigations. This case illustrates how all-sky infrared spectrophotometry can reveal bright lensed objects overlooked in prior surveys.

Core claim

The central claim is that J1330-0905 is a quadruply-lensed quasar at redshift 2.22 whose four images are resolved by LBT adaptive optics in a compact configuration, with SPHEREx spectrophotometry providing the redshift and quasar classification from public data alone. The system is the brightest gravitationally lensed quasar yet found, and an elliptical power-law mass distribution plus external shear fits the image locations while predicting a total magnification of approximately 56, despite anomalous flux ratios among the images.

What carries the argument

SPHEREx full-sky infrared spectrophotometry combined with LBT adaptive optics imaging, which together establish the single-source quasar nature, measure the redshift, resolve the four images, and enable the elliptical power-law plus external shear mass model.

If this is right

  • The anomalous image flux ratios combined with time delays of at most two days enable future microlensing monitoring campaigns to probe the quasar structure and lens substructure.
  • The total magnification of approximately 56 makes the background quasar appear unusually bright for detailed follow-up at optical and infrared wavelengths.
  • The compact Einstein radius of 0.45 arcseconds and accurate mass model fit demonstrate that simple lens models can still describe systems with highly anomalous flux ratios.
  • SPHEREx-style all-sky spectrophotometry can identify other bright lensed quasars that optical surveys have missed due to their compactness or color.

Where Pith is reading between the lines

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

  • Monitoring campaigns could measure the short time delays directly and test whether the flux anomalies persist across wavelengths or vary with time.
  • The system adds a high-magnification anchor point that could refine statistical predictions for the number of bright lensed quasars detectable in future infrared surveys.
  • If the mass model holds, the predicted image positions offer a clean target for high-resolution imaging to search for the lensing galaxy and any nearby perturbers.

Load-bearing premise

The four resolved images and the spectrophotometric signal all belong to one background quasar at redshift 2.22 instead of unrelated objects or chance alignments, and the elliptical power-law plus external shear model correctly describes the lens geometry.

What would settle it

Obtaining separate spectra of each of the four images and finding inconsistent redshifts or entirely different spectral features would disprove that they are multiple images of a single quasar at z=2.22.

Figures

Figures reproduced from arXiv: 2604.13152 by Arpita Ganguly, Eduardo Ba\~nados, Frederick B. Davies, Jennifer Power, Jon Rees, Sarah E. I. Bosman, Silvia Belladitta.

Figure 1
Figure 1. Figure 1: Gaia XP spectrum (left) and SPHEREx spectrophotometry (right) of J1330−0905. Common broad emission line features redshifted to z = 2.22 are labeled with vertical dashed lines. public survey data (Gaia, Gaia Collaboration et al. 2016; WISE, Wright et al. 2010; Mainzer et al. 2011; the Panoramic Survey Telescope and Rapid Response Sys￾tem (Pan-STARRS) survey, Chambers et al. 2016) as part of the larger QUasa… view at source ↗
Figure 2
Figure 2. Figure 2: Color-composite JHK LBT/LUCI1 image of the J1330−0905 field (left) and zoomed-in cutout (right) with a logarithmic stretch to highlight faint features. We label the individual images ABCD from brightest (lower left) to faintest (top) along with the presumptive lens galaxy G (middle). phone’s Torch3 . The combination of the four images, i = 14.77 in Pan-STARRS, is the brightest total mag￾nitude of any gravi… view at source ↗
Figure 4
Figure 4. Figure 4: Light curve of J1330−0905 from ZTF in i-band (black), r-band (red), and g-band (green). More recent photometry from SPHEREx is binned to match the i-band (points with uncertain￾ties). The measurements include all four lensed images. Another piece of evidence which could have been used to support the quasar nature of J1330−0905 is its vari￾ability. In [PITH_FULL_IMAGE:figures/full_fig_p004_4.png] view at source ↗
read the original abstract

Here we report the spectroscopic and geometric confirmation of an extremely bright ($i=14.77$) and compact (Einstein radius of $\sim0.45''$) quadruply-lensed quasar at $z=2.22$, J1330$-$0905, which we dub Persephone's Torch. The system had been previously selected as a candidate lensed quasar based on large-area survey data; here we confirm its quasar nature and redshift using public spectrophotometry from the SPHEREx mission, a.k.a. "from the couch". Adaptive optics imaging with LBT/LUCI resolves four images in a "circular kite" configuration. The system is the brightest gravitationally-lensed quasar system ever found. While an elliptical power-law mass distribution plus external shear accurately reproduces the locations of the images and lensing galaxy, and predicts a total magnification of $\sim56$, the brightnesses of the lensed images present highly anomalous flux ratios. Together with short time delays between images ($\leq 2$ days), this makes Persephone's Torch a promising candidate for future microlensing studies. Our discovery highlights the potential of SPHEREx full-sky infrared spectrophotometry to uncover extraordinarily bright objects that have otherwise been overlooked.

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

2 major / 2 minor

Summary. The manuscript reports the discovery and confirmation of an extremely bright (i=14.77) quadruply-lensed quasar J1330−0905 at z=2.22, dubbed Persephone's Torch, using public SPHEREx spectrophotometry for redshift and quasar identification together with LBT adaptive-optics imaging that resolves four images in a circular-kite configuration. An elliptical power-law lens model plus external shear reproduces the image positions and lens-galaxy location, predicts a total magnification of ∼56, and yields short time delays (≤2 days), while the anomalous flux ratios are attributed to microlensing; the system is claimed to be the brightest known lensed quasar.

Significance. If the single-source lensing interpretation is secure, the result is significant: it supplies the brightest known quadruply-imaged quasar, ideal for microlensing and time-delay cosmography studies, and illustrates the power of SPHEREx full-sky infrared spectrophotometry to recover bright, compact systems overlooked by optical surveys. The public-data approach and the compact Einstein radius (∼0.45″) are particular strengths.

major comments (2)
  1. [§3] §3 (SPHEREx spectrophotometry): the redshift z=2.22 and quasar classification rest on blended, unresolved spectrophotometry of the entire system. No per-image spectra are presented, so the possibility that the four LBT point sources are unrelated objects whose combined light mimics a single quasar spectrum is not directly excluded.
  2. [§4] §4 (lens modeling): the elliptical power-law plus external-shear model fits the four image positions and the lens-galaxy location but fails to reproduce the observed flux ratios (attributed to microlensing). Without an independent check from measured time delays or flux-ratio consistency, the geometric confirmation of a single macro-lens remains partially unverified.
minor comments (2)
  1. [Abstract] Abstract: the unqualified statement that the system is 'the brightest gravitationally-lensed quasar system ever found' should include a brief comparison to the previous record holder and a supporting reference.
  2. [Figure 1] Figure 1 or 2 (LBT imaging): labeling the four images (A–D) and the lens galaxy position directly on the figure would improve clarity for readers.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for their careful and constructive review. We address each major comment below and have revised the manuscript to incorporate clarifications where appropriate while preserving the core claims supported by the public data.

read point-by-point responses

  1. Referee: [§3] §3 (SPHEREx spectrophotometry): the redshift z=2.22 and quasar classification rest on blended, unresolved spectrophotometry of the entire system. No per-image spectra are presented, so the possibility that the four LBT point sources are unrelated objects whose combined light mimics a single quasar spectrum is not directly excluded.

    Authors: We agree that the SPHEREx spectrophotometry is blended and unresolved. The LBT adaptive-optics imaging, however, resolves four distinct point sources in a circular-kite configuration centered on an extended object consistent with the lens galaxy. The blended spectrum shows clear, single-redshift quasar emission lines at z=2.22 with no evidence of multiple components. The probability of four unrelated objects aligning in this precise geometry with a foreground galaxy is extremely low. We have added a paragraph to the revised Section 3 quantifying this low chance-alignment probability and noting that resolved spectroscopy would require future observations beyond the scope of this public-data discovery. revision: partial

  2. Referee: [§4] §4 (lens modeling): the elliptical power-law plus external-shear model fits the four image positions and the lens-galaxy location but fails to reproduce the observed flux ratios (attributed to microlensing). Without an independent check from measured time delays or flux-ratio consistency, the geometric confirmation of a single macro-lens remains partially unverified.

    Authors: The model is constrained by the four image positions and the lens-galaxy centroid, which together provide geometric confirmation of the macro-lens independent of fluxes. The mismatch in flux ratios is expected and is routinely attributed to microlensing in lensed quasars; we discuss this explicitly. The model predicts short time delays (≤2 days), enabling future monitoring to supply independent verification. We have expanded the text in the revised Section 4 to clarify that positional agreement constitutes the geometric confirmation while microlensing accounts for the flux anomalies. revision: partial

Circularity Check

0 steps flagged

Observational discovery paper with standard lens modeling shows no significant circularity

full rationale

The paper is an observational confirmation of a lensed quasar candidate using new SPHEREx spectrophotometry for redshift and LBT AO imaging to resolve four images. Image positions are fitted with a standard elliptical power-law + shear model to confirm consistency with a single lens, but this is not a derivation or prediction that reduces to prior inputs by construction. No self-citations are load-bearing for the central claim, no ansatz is smuggled, and no fitted parameters are renamed as independent predictions. The central result (discovery and confirmation of the system) is self-contained against external data.

Axiom & Free-Parameter Ledger

2 free parameters · 1 axioms · 0 invented entities

The central claim rests on standard gravitational lensing theory and a small number of fitted parameters in the lens mass model; no new entities are postulated.

free parameters (2)
  • power-law index of lens mass distribution
    Fitted to match observed image positions in the elliptical power-law plus shear model.
  • external shear magnitude and direction
    Fitted parameters to reproduce the image configuration and predict magnification.
axioms (1)
  • standard math General relativity accurately describes gravitational lensing by galaxies
    Invoked to model image positions and magnification with a power-law mass profile.

pith-pipeline@v0.9.0 · 5562 in / 1389 out tokens · 26499 ms · 2026-05-10T14:35:07.072657+00:00 · methodology

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Forward citations

Cited by 1 Pith paper

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

  1. Beyond collective fluctuations: probing micro-image swarms in lensed quasars with intensity interferometry

    astro-ph.CO 2026-05 unverdicted novelty 7.0

    Intensity interferometry offers a way to measure micro-image swarm sizes in lensed quasars, revealing stellar and compact dark matter mass functions beyond collective intensity fluctuations.

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