REVIEW 3 major objections 3 minor 1 cited by
AT2022sxl: A Candidate Repeating Tidal Disruption Event in Possible Association with Two High-Energy Neutrino Events
T0 review · 3 major / 3 minor · reviewed 2026-08-05 · deepseek-v4-flash
Pith's one-line read AT2022sxl is a candidate repeating tidal disruption event whose two optical flares, 7.2 years apart, match two IceCube neutrino alerts.
desk verdict Candidate repeating TDE worth a referee, but the neutrino association is unproven without a chance-coincidence calculation. 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 central objects are the multi-epoch optical and mid-infrared light curves of AT2022sxl plus two optical spectra, one taken near the second optical peak and one at quiescence. The light curves establish the ~7.2-year recurrence and the ~200-day MIR delay; the spectral comparison isolates the TDE's broad emission lines from the host galaxy's narrow lines; and the IceCube Bronze events act as the spatial-temporal link connecting the flares to high-energy neutrinos.
What would settle it
Compute the chance-coincidence probability of two unrelated Bronze events falling within AT2022sxl's localization and within the ~200-day MIR window using IceCube's all-sky Bronze event rate; if that probability is not small, the association fails. Alternatively, a third optical/MIR flare with no coincident neutrino would weaken the claimed pattern.
Extended reading notes
Core claim
AT2022sxl is a candidate repeating TDE: the optical light curve shows two distinct flares with peaks ~7.2 yr apart, each followed by a ~200-day-delayed mid-infrared flare. At the second optical peak, a spectrum shows broad emission in H$\alpha$, H$\beta$, and He I $\lambda$5876 on top of a composite host galaxy at z=0.23, while a later quiescent spectrum shows the narrow host lines alone, confirming the TDE origin of the broad components. The paper reports that two Bronze-type IceCube neutrino events are positionally consistent with AT2022sxl and temporally aligned with the second flare and its delayed MIR flare. Together these make AT2022sxl a candidate repeating TDE and a possible neutrino
Load-bearing premise
The neutrino association rests on accepting two low-significance IceCube Bronze events with large angular uncertainties as reliable positional and temporal matches; if they are chance coincidences, the neutrino-TDE connection and the MIR-prerequisite suggestion lose their main support.
Editorial extensions
If this is right
- If AT2022sxl is genuinely repeating, TDEs can recur on timescales of a few years, consistent with partial disruption of a star on an eccentric orbit.
- The ~200-day MIR delay implies dust formation or reprocessing after each optical flare, giving a predictable sequence for future multi-wavelength observations.
- A real neutrino match would add AT2022sxl to the small sample of TDE-neutrino associations and tighten the empirical link between MIR-luminous TDEs and neutrino production.
- The next optical/MIR flare can be predicted roughly on the ~7.2-year cycle and should be monitored with X-ray, UV, and neutrino telescopes.
- Comparing the two flares' spectra and light curves can test whether the same star is being repeatedly partially disrupted.
Reading between the lines
- An implicit extension is that archival IceCube Bronze events could be systematically matched to known TDE light curves; AT2022sxl suggests low-significance events should not be ignored when multiple independent events align.
- The paper's MIR-prerequisite suggestion points to a testable prediction: future TDE-neutrino associations should preferentially show bright dust-echo emission, while optically bright but MIR-dim TDEs should produce few neutrinos.
- If the ~7.2-year recurrence is set by the orbital period of the partially disrupted star, the same object might produce additional flares at predictable epochs, offering a real-time search for neutrinos at the next peak.
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. The manuscript reports AT2022sxl as a candidate repeating tidal disruption event (TDE) found in large-field optical survey data, with two optical flares separated by ~7.2 yr and associated mid-infrared flares delayed by ~200 day. Two optical spectra are presented: one near the second optical peak from TNS and one at quiescent flux obtained with GTC. The authors classify the host as a composite galaxy at z=0.23 and the TDE as likely H+He type based on broad H-alpha, H-beta, and He I components. The central novel claim is that two IceCube Bronze-type neutrino events match AT2022sxl in position and in time with the second flare, especially the delayed MIR flare. From this, the authors suggest that luminous MIR emission is a prerequisite for neutrino production in TDEs. The full text supplied is corrupted mojibake; only the abstract is readable.
Significance. If the repeating-TDE classification and the neutrino association hold, AT2022sxl would be one of the few TDEs with a plausible high-energy neutrino counterpart, and the MIR-prerequisite suggestion would be a testable phenomenological claim. The repeating-TDE part has independent support from two optical flares and two spectra, and the use of external IceCube data avoids parameter circularity. However, the broader significance rests on the statistical robustness of the neutrino coincidence, which is not reported, and on a small sample of MIR-luminous TDEs. The paper's value at present is therefore that of a candidate/report: interesting but not yet quantitatively established.
major comments (3)
- [Full text (as supplied)] The full text is unreadable mojibake; equations, tables, figures, and all quantitative details are garbled. This prevents verification of the claimed 7.2 yr separation, the ~200 day MIR delays, the spectral decomposition, and the neutrino coincidence. A readable manuscript with all supporting material must be provided before the claims can be assessed.
- [Abstract (neutrino association)] No chance-coincidence probability is given for the two IceCube Bronze events. Bronze events have large angular uncertainties and low individual significance. The abstract claims a positional and temporal match without quoting per-event or joint p-values, trial factors, or the neutrino error radii. Without this, the 'possible association' and the MIR-prerequisite conclusion are statistically unsupported.
- [Abstract and Discussion (MIR prerequisite)] The conclusion that luminous MIR emission is a prerequisite for neutrino production in TDEs is based on a small sample that includes AT2022sxl itself. The abstract reports no systematic control sample, no quantitative definition of 'luminous MIR', and no discussion of survey cadence or selection effects. This is a load-bearing interpretive claim and needs either a statistical comparison or a clearly framed hypothesis-generating caveat.
minor comments (3)
- [Abstract] The spectral classification is stated as 'H+He type' without defining the classification scheme or giving line-fit parameters; this should be specified in the text.
- [Abstract] The host classification 'composite galaxy' is asserted without showing the diagnostic line ratios; if present in the corrupted text, the relevant figure/table must be made legible.
- [General] The manuscript should cite the IceCube alert stream documentation and specify how Bronze alerts are selected, since the association claim relies on the statistical meaning of this alert class.
Circularity Check
No circularity: the neutrino association and MIR-prerequisite suggestion are derived from external IceCube data and the observed light curves, not from a fitted parameter or self-referential definition.
full rationale
The paper's central derivation is the discovery of two optical flares separated by ~7.2 yr, corresponding MIR flares delayed by ~200 d, and two Bronze-type IceCube neutrino events that match the TDE position and timing. These inputs (external IceCube alerts, optical survey photometry, MIR light curves, and spectra) are not constructed from the conclusions. The claimed neutrino match is an observed spatial/temporal coincidence with external data, and no parameter is fitted to force that match. The MIR-luminosity 'prerequisite' statement is an interpretive generalization based on the small sample of putative neutrino-emitting TDEs; it is a concluding inference rather than an input used in the derivation, so it is not circular in the formal sense. No load-bearing self-citation, ansatz-smuggling, or uniqueness-import from the authors is present. Concerns about the absence of a chance-coincidence probability for the Bronze events are statistical-evidence questions, not circularity.
Assumptions & free parameters
assumptions (4)
- domain assumption The two optical flares belong to the same nuclear transient source, a repeating TDE, and not to independent AGN or supernova activity.
- domain assumption IceCube Bronze neutrino events are reliable enough for astrophysical association despite their large localization and lower significance.
- domain assumption The redshift z=0.23 and the composite-galaxy host classification from the spectra are accurate.
- domain assumption The MIR flares are physically tied to the optical flares with a ~200 day delay, not independent dust variability.
Cite this review
Pith. "Pith review of AT2022sxl: A Candidate Repeating Tidal Disruption Event in Possible Association with Two High-Energy Neutrino Events." pith.science (2026). https://pith.science/paper/BLEKM2PU
@misc{pith2026250809408,
author = {Pith},
title = {Pith review of: AT2022sxl: A Candidate Repeating Tidal Disruption Event in Possible Association with Two High-Energy Neutrino Events},
year = {2026},
howpublished = {\url{https://pith.science/paper/BLEKM2PU}},
note = {Machine review of arXiv:2508.09408}
}
abstract
We report a candidate repeating tidal disruption event (TDE), AT2022sxl, found from large-field optical survey data. Two flares with a separation time of $\sim$7.2\,yr between the two optical peaks are observed. Related mid-infrared (MIR) flares, with delay times of $\sim$200\,day are also seen. We analyze two optical spectra of the TDE source, onenear the optical peak of the second flare from the Transient Name Server and one at the quiescent flux level after the second flare. The latter was taken by us with the 10.4-m Gran Telescopio Canarias. Comparing the features of the two spectra, we identify that the host is likely a composite galaxy at redshift 0.23 and the TDE event, probably an H+He type, mainly powered broad components in the emission lines of H$\alpha$, H$\beta$, and He~I $\lambda$5876. More interestingly, we find that two Bronze-type neutrino events, detected by the IceCube neutrino observatory, match the TDE in position and the second flare, especially the delayed MIR flare, in time. We discuss the MIR luminosity properties of the currently reported (candidate) neutrino-emitting TDEs and suggest that luminous MIR emission is a prerequisite for neutrino production in TDEs.
Forward citations
Cited by 1 Pith paper
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IGR J12580+0134: A Possible Repeated Partial Tidal Disruption Event Inferred from Late-Time Radio Re-brightenin
IGR J12580+0134 is proposed as a repeating partial tidal disruption event candidate, with two radio flares separated by ~1513 days and a possible third rebrightening.
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Reviewed August 5, 2026 · model on record in the stance chip above.
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