REVIEW 4 major objections 5 minor 1 cited by
ASASSN-24fw: An 8-month long, 4.1 mag, optically achromatic and polarized dimming event
T0 review · 4 major / 5 minor · reviewed 2026-08-06 · deepseek-v4-flash
Pith's one-line read ASASSN-24fw's eight-month, 4.1-magnitude dimming was produced by an occulter of large carbonaceous or water-ice grains roughly 20 micrometers in size, not by a stellar eclipse or small dust.
desk verdict A well-observed new long, deep, achromatic, polarized eclipse, but the carbon/ice grain composition claim rests on a polarization proxy that needs a real radiative-transfer test. read the letter →
The pith
A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.
The reading
What carries the argument
The argument is carried by comparing the effective opacity $\kappa = \sqrt{\kappa_{\rm abs}(\kappa_{\rm abs}+\kappa_{\rm scat})}$ at the $g$ and $z$ wavelengths to measure achromaticity, and by using the ratio of scattering matrix elements $|Z_{12}/Z_{11}|$ at forward scattering to estimate the polarizing power of each grain composition and size. These are computed with the optool package over a grid of seven compositions and radii from 0.01 to 10,000 μm; only carbon, graphite, and water ice at ~20 μm appear in the region where both the color-change constraint and the polarization constraint are satisfied. The precession geometry is quantified using standard analytical formulas for disk precession that link the observed recurrence to a circumbinary disk precessing by 180 degrees.
What would settle it
Measure the V-band polarization of ASASSN-24fw in quiescence now that the dimming has ended: the large-grain occulter model predicts it should drop to near zero, so a persistent polarization would undercut the claim that the occulter produces the observed polarization. A second decisive test is radial-velocity monitoring, since the proposed binary predicts an F-star orbital velocity of roughly 2.6 km/s on a few-year timescale, and a non-detection would falsify the companion interpretation.
Extended reading notes
Core claim
The central claim is that the eight-month, 4.12-magnitude g-band eclipse of ASASSN-24fw is optically near-achromatic, Δ(g−z)=0.31±0.15 mag, and polarized at up to 4% in V band, and that the only dust compositions and sizes that satisfy both constraints are carbonaceous or water-ice grains at ~20 μm. Silicate grains of any size that are large enough to be achromatic do not polarize enough, while carbon dioxide ice produces too much color change. The paper concludes that the occulter is a dust structure dominated by tens-of-micrometer carbon or ice grains, most plausibly a circumbinary disk precessing around an F star–M dwarf binary, with the 43.8-year period representing half the precession period.
Load-bearing premise
The 43.8-year recurrence period, proposed on the basis of a few archival plate non-detections from 1937 and 1981, is only marginally allowed by the paper's own period search given gaps in the light-curve coverage; if this period is wrong, the precession-based geometry for the system loses its foundation.
Editorial extensions
If this is right
- A 43.8-year recurrence predicts the next eclipse around 2068, with the same symmetric, near-achromatic shape if the occulter is coherent.
- Long, deep, achromatic eclipses with polarization become direct probes of grain growth in protoplanetary and debris disks.
- Polarimetric monitoring alone could identify large-grain occulters in similar events without waiting for multiwavelength follow-up.
- The census of 46 similar systems, roughly half with mid-infrared excesses, supports dust as the common cause of long deep eclipses.
Reading between the lines
- If the 43.8-year period is confirmed by future observations, the same archival-gap technique could be applied to other candidate precessing disks, where sparse photometry currently hides long-period eclipses.
- A single polarized, gray eclipse measurement may be sufficient to infer large grains in other systems, making polarimetry a cheap screen for large-grain occulters among the known long deep eclipses.
- The predicted M dwarf companion, currently inferred from SED decomposition and line dilution, could be confirmed by high-resolution spectroscopy; such a detection would also pin down the binary orbit required by the precession model.
- Because most long deep eclipses in the survey show mid-IR excess, the systems lacking W1/W2 excess may harbor cooler dust; longer-wavelength observations would test whether dust is truly essential to all such events.
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. The paper reports an extensive multi-wavelength photometric, spectroscopic, and polarimetric campaign on ASASSN-24fw, a 13th-magnitude F star that underwent a 4.12 mag optical eclipse lasting about 8 months in 2024-2025. The eclipse is nearly achromatic, with a small blue excess of Δ(g−z)=0.31±0.15 mag, and the V-band emission is polarized by up to about 4%. The quiescent SED is modeled with DUSTY, yielding T*=6490±120 K, log(L*/Lsun)=0.828±0.005, and warm circumstellar dust; an additional 0.25 solar-mass M dwarf companion is invoked to explain the occulted SED and the dilution of infrared absorption lines. A 43.8-year period proposed by Nair & Denisenko (2024) is considered plausible. From Mie calculations of opacity and scattering matrices, the authors conclude that the occulter is composed of ~20 micron carbonaceous or water-ice grains, while silicates and CO2 ice are disfavored. The paper also compiles a sample of 46 long-deep eclipsing systems and compares their periods, durations, depths, and color-magnitude positions.
Significance. If the grain-composition conclusion holds, ASASSN-24fw would be a rare and valuable diagnostic of grain growth in a protoplanetary, debris, or ring-like disk, connecting eclipse chromaticity and polarimetry to grain size and composition. The observational dataset is unusually complete: dense optical light curves, near-infrared photometry, optical and infrared spectra, five epochs of polarimetry, and long-baseline archival coverage. The forward Mie calculation is a real strength: the achromaticity argument is not a fitted color but a prediction from independent optical constants. The population survey of long-deep eclipses is also a useful resource, even if the classification is necessarily heuristic. However, the central composition claim is not yet quantitatively secure because the polarization constraint is not modeled with actual radiative transfer, and several auxiliary assumptions (the 43.8-year period, the artificial inflation of SED errors, the undetected M dwarf companion) weaken the interpretive superstructure.
major comments (4)
- [§3.4, Fig. 9] The grain-composition conclusion is carried by the polarization constraint, but the paper never computes the polarization that the proposed grain population would actually produce in the eclipse geometry. The text equates the ability to polarize with |Z12/Z11| at θ=0, yet with τ~3.8 the observed light is a mixture of transmitted and multiply scattered light, so the net polarization is not set by this single-scattering ratio. The plotted values for carbon and ice at a≈20 μm are below ~1.5%, while the observed V-band polarization reaches 3.97±0.60%, implying that the proxy appears to underpredict the required polarization by a factor of several; the paper does not resolve this tension. A proper radiative-transfer calculation, including multiple scattering and the finite source, is needed before carbon/ice can be favored over silicates. I also note that the empirical polarization signal is weak: the magnitude-polarization correlation is r=0.54 and drops to r=0.02 if the last in-eclipse point is removed (Table 4), with no pre-event baseline.
- [§3.1, Fig. 4] The quiescent SED fit has an important methodological caveat: the authors state that they 'artificially increased the uncertainties on the Skymapper u band ... and the WISE 4.5 μm band' to force the model through the WISE 3.6 μm point. This means the reported reduced χ²=1.12 and the derived stellar parameters, dust temperature, and optical depth are not obtained from a homogeneous treatment of the data. The choice affects the inferred companion and dust properties used later in Sections 3.4-3.5. The authors should either fit with the native uncertainties and discuss the residuals, or justify the inflated errors with known systematics in SkyMapper u and WISE 4.5 μm photometry.
- [§3.3-3.5, Fig. 6] The 43.8-year period is not reliably established. Figure 6 shows it is only 'marginally allowed' by the light-curve gaps, and the DASCH evidence consists largely of non-detections and upper limits. The Section 3.5 precession models are built on this period and on the undetected 0.25 solar-mass companion. I recommend softening the period statement (from 'appears correct' in the Abstract to 'tentative') and presenting the circumbinary-disk precession as one possible scenario rather than the most probable one.
- [§3.2-3.3] The 0.25 solar-mass M dwarf is not directly detected; its mass and temperature are inferred from a semi-quantitative three-component SED decomposition and from dilution of the Brγ line relative to Paβ. Since the paper itself describes the model as 'semi-quantitative', the companion parameters are weakly constrained, and all Section 3.5 geometry scenarios assume this companion. A high-resolution spectrum after the eclipse, or an astrometric or radial-velocity detection, is needed to validate this component.
minor comments (5)
- [Abstract, §1] There is a typo, 'dimmimg', in the Abstract and again in Section 1; it should be 'dimming'.
- [§3.4] In the discussion of water ice, 'larger and smaller gains' should read 'larger and smaller grains'.
- [§3.5] The text refers to a '2×48.3 year precession period', which is inconsistent with the 43.8-year period used elsewhere; if the event period is 43.8 years, the precession period should be 2×43.8 years.
- [Table 6] Table 6 is extremely dense; providing a machine-readable version or separating the reference list into a supplementary table would improve usability.
- [Figure 9] The right panel of Figure 9 shows |Z12/Z11|, but the observational constraint on polarization is stated only in the text; adding a horizontal line at the observed P≈4% level would make the comparison transparent.
Circularity Check
No significant circularity: the grain-size/composition conclusion is a forward Mie/optical-constants calculation compared against independent photometry and polarimetry, not a fit re-labeled as a prediction.
full rationale
The central claim - that the occulter is dominated by ~20 micron carbonaceous or water-ice grains - is derived by computing (kappa_g - kappa_z)/kappa_g and |Z12/Z11| with optool for seven compositions using published optical constants (Dorschner et al. 1995; Draine 2003a,b; Zubko et al. 1996; Warren & Brandt 2008), then comparing those forward predictions to the measured color change Delta(g-z)=0.31+/-0.15 mag and V-band polarization up to 4%. No parameter of the grain model is fitted to the eclipse colors, so the inference is not circular by construction. The geometric interpretation inherits the 43.8-year period proposed by Nair & Denisenko (2024), an external non-author ATel, and the paper's own period search only finds it 'marginally allowed'; that is an acknowledged external uncertainty, not a self-referential reduction. The M dwarf companion is a model component introduced to fill the near-IR excess of the minimum SED and is later used in the geometric scenarios; this creates a self-consistency burden but does not equate a predicted quantity with an input by definition. The paper also explicitly notes the fragility of the polarization correlation (r drops to 0.02 if the last point is excluded) and the proxy nature of |Z12/Z11|, which are correctness/robustness concerns rather than circularity. Self-citations (ASAS-SN ATels, Adams et al. 2017, Kochanek 2014a,b, Petz & Kochanek 2025) are contextual, methodological, or parameter-free analytic results and are not load-bearing for the central grain-size conclusion.
Assumptions & free parameters
free parameters (8)
- Quiescent SED stellar luminosity L* =
log(L*/Lsun)=0.828±0.005
- Effective temperature T* =
6490±120 K
- Circumstellar dust optical depth tau_V =
0.249±0.017
- Dust temperature Td =
552±16 K
- Ingress optical-depth power-law index gamma =
best near 3-5, chi2 minimized at gamma=4
- Ingress optical depth scale tau0 =
2.40 (fixed)
- Ingress velocity v and scale length r0 =
degenerate, contours shown in Fig. 8
- Occulter grain radius a =
~20 micrometers
assumptions (5)
- ad hoc to paper The occulter optical depth profile near the edge is a power law with negative exponent (tau = tau0 (r/r0)^-gamma).
- domain assumption Mie theory and tabulated optical constants for pyroxene, olivine, astrosil, carbon, graphite, water ice, and CO2 ice are applicable to the grain population.
- domain assumption The quiescent SED can be modeled with a spherical DUSTY shell of graphitic grains with an MRN size distribution.
- domain assumption The recurrence period of 43.8 years proposed by Nair and Denisenko (2024) is correct.
- ad hoc to paper The binary companion is a 0.25 solar-mass M dwarf and the occulter is a circumbinary disk precessing with period 2 times 43.8 years.
invented entities (2)
-
0.25 solar-mass M dwarf companion
-
Precessing circumbinary dust disk (the occulter)
Cite this review
Pith. "Pith review of ASASSN-24fw: An 8-month long, 4.1 mag, optically achromatic and polarized dimming event." pith.science (2026). https://pith.science/paper/RXRKE2JG
@misc{pith2026250703080,
author = {Pith},
title = {Pith review of: ASASSN-24fw: An 8-month long, 4.1 mag, optically achromatic and polarized dimming event},
year = {2026},
howpublished = {\url{https://pith.science/paper/RXRKE2JG}},
note = {Machine review of arXiv:2507.03080}
}
abstract
We discuss ASASSN-24fw, a 13th-magnitude star that optically faded by $\Delta g = 4.12 \pm 0.02$ mag starting in September 2024 after over a decade of quiescence in ASAS-SN. The dimmimg lasted $\sim$8 months before returning to quiescence in late May 2025. The spectral energy distribution (SED) before the event is that of a pre-main sequence or a modestly evolved F star with some warm dust emission. The shape of the optical SED during the dim phase is unchanged and the optical and near-infrared spectra are those of an F star. The SED and the dilution of some of the F star infrared absorption features near minimum suggest the presence of a $\sim$0.25$M_\odot$ M dwarf binary companion. The 43.8 year period proposed by Nair & Denisenko (2024) appears correct and is probably half the precession period of a circumbinary disk. The optical eclipse is nearly achromatic, although slightly deeper in bluer filters, $\Delta (g-z)=0.31\pm0.15$ mag, and the $V$ band emission is polarized by up to 4%. The materials most able to produce such small optical color changes and a high polarization are big ($\sim$20 $\mu$m) carbonaceous or water ice grains. Particle distributions dominated by big grains are seen in protoplanetary disks, Saturn-like ring systems and evolved debris disks. We also carry out a survey of occultation events, finding 46 additional systems, of which only 7 (4) closely match $\varepsilon$ Aurigae (KH 15D), the two archetypes of stars with long and deep eclipses. The full sample is widely distributed in an optical color-magnitude diagram, but roughly half show a mid-IR excess. It is likely many of the others have cooler dust since it seems essential to produce the events.
Figures
Figures from the paper (9 more)
Forward citations
Cited by 1 Pith paper
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A Systematic Search for Main-Sequence Dipper Stars Using the Zwicky Transient Facility
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Reference graph
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