REVIEW 3 major objections 4 minor 7 cited by
TiDES: The 4MOST Time Domain Extragalactic Survey
T0 review · 3 major / 4 minor · reviewed 2026-08-10 · deepseek-v4-flash
Pith's one-line read The planned TiDES survey could build a 143,000-supernova Hubble diagram and pin dark energy's equation-of-state parameter to 1.2 per cent.
desk verdict A transparent, well-built survey-design forecast; the sub-2% w headline is statistical-only and assumes perfect photometric typing, but the paper states both assumptions clearly. 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 an end-to-end catalogue-level simulation pipeline rather than by a single analytic identity. LSST OpSim observing patterns are converted into SNANA inputs, which generate realistic light curves from spectral templates and a host-galaxy library; a TiDES selection function mimics real-time triggering of live transients and faded-host targets; the 4MOST Facility Simulator (4FS) allocates fibres and schedules a mock five-year survey alongside other 4MOST programmes; and mock spectra are produced with the 4MOST exposure-time calculator and judged against per-survey Spectral Success Criteria—mean SNR of 5 per 15 Å for live SN classification, SNR of 3 per Å for host-galaxy redshifts, and SNR of 10 per 15 Å for AGN. For cosmology, the surviving SNe Ia are fit with SALT2, distances are estimated with the Tripp formula, selection effects are corrected with BBC, and parameters are extracted with the wfit minimiser in SNANA. This chain converts fibre-hour accounting into a predicted $\sigma(w)$.
What would settle it
A concrete calculation that would settle the claim: pass the simulated LSST light curves through a realistic photometric classifier with a measured confusion matrix, re-run the same bias-correction and cosmological fit, and compare the recovered uncertainty on $w$ with the paper's 0.012; if realistic contamination pushes $\sigma(w)$ above 2 per cent, the headline forecast depends on the perfect-typing assumption.
Extended reading notes
Core claim
The paper's central claim is that the TiDES fibre budget—roughly 30–35 low-resolution fibres per 4MOST pointing, about 250,000 fibre-hours over five years—is sufficient to create a SN Ia sample an order of magnitude larger than today's best surveys. In the simulations, the live-transient programme yields about 18,000 SNe Ia with spectra at SNR per 15 Å of at least 3 (12,600 of them pass the SALT2 'cosmologically useful' cuts), while the host-galaxy programme yields about 131,000 photometrically identified SNe Ia with host spectroscopic redshifts. Combining these with a low-redshift sample of 2,400 SNe Ia and a Planck prior, the paper forecasts $\sigma(w)=0.012$ for a flat $w$CDM model, quoting this as a sub-2 per cent measurement and a factor-of-ten improvement over a DES-SN5YR-like simulation; for a flat $w_0w_a$CDM model the figure of merit is 85, or 99 when combined with a DESI BAO Y1 prior, and is 15 times larger than the DES-SN5YR figure of merit. The paper also claims this one survey will enlarge the spectroscopically confirmed transient population by an order of magnitude, including over 9,000 core-collapse SNe and about 3,000 hydrogen-poor superluminous SNe, and will deliver one of the largest reverberation-mapped AGN samples over $0.1<z<2.5$, with 700–1,000 targets across the four deep fields.
Load-bearing premise
The 131,000-host supernova sample—the bulk of the Hubble diagram—is assumed to be perfectly classified as standard type Ia supernovae from their light curves alone; if even a small fraction of those events are actually a different kind of explosion, the distance estimates and the sub-2 per cent dark-energy claim would not hold.
Editorial extensions
If this is right
- If the forecast holds, SN Ia cosmology becomes statistics-limited far below current systematic budgets, shifting the field's bottleneck to photometric typing purity, bias corrections, and distance-estimator systematics.
- The roughly 12,600 live SN Ia spectra will form a large, homogeneous training set for photometric classifiers, potentially extending the cosmological sample beyond TiDES hosts to the full LSST SN Ia population.
- The order-of-magnitude expansion of spectroscopically confirmed transients, including rare classes such as calcium-strong transients and tidal disruption events, would sharpen measured rates and map the luminosity–timescale plane far more completely than current samples.
- The AGN reverberation-mapping sample provides a second, independent standardisable candle out to $z\sim2.5$, allowing a cross-check of the SN Ia dark-energy measurement and dynamical supermassive black hole masses at cosmic noon.
- Host-galaxy spectroscopy will tie SN Ia distances to environmental properties such as stellar mass, metallicity, and star-formation rate, enabling tests of whether environment-dependent corrections reduce Hubble residuals.
Reading between the lines
- The paper's headline forecast treats the 131,000-object host-redshift sample as perfectly typed from light curves; a natural next calculation is to inject a realistic classifier confusion matrix into the BBC pipeline and quantify how much of $\sigma(w)=0.012$ is carried by that assumption.
- Once real data arrive, the overlap between TiDES-Live and TiDES-Hosts provides a built-in empirical check of photometric typing purity—spectroscopically classified SNe within the host-selected sample can be used to measure contamination directly and re-weight the Hubble diagram.
- The AGN programme's yield depends on maintaining the simulated 14-day cadence and season lengths in the deep fields; if the actual 4MOST schedule delivers shorter baselines, the number of recovered lags and the reach of the $z\sim2.5$ Hubble diagram will shrink accordingly.
- Because other 4MOST surveys will observe millions of galaxies, many SN hosts will acquire redshifts without TiDES fibre-hours, so the effective host sample may be larger or cheaper than simulated, which would justify re-optimising the fibre split among the three TiDES programmes.
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. The paper introduces TiDES, the 4MOST Time Domain Extragalactic Survey, and uses end-to-end catalogue-level simulations of LSST and 4MOST to forecast the survey's yields and cosmological reach. Three programmes are described: TiDES-Live (spectroscopy of live transients), TiDES-Hosts (host-galaxy redshifts for photometrically classified SNe), and TiDES-RM (reverberation mapping of AGN in the LSST deep drilling fields). The cosmology forecast combines ~12,600 spectroscopically confirmed SNe Ia with ~131,000 photometric SNe Ia having host-galaxy redshifts and an external low-z sample of 2,400 SNe, then applies SALT2 light-curve fits, BBC bias corrections, and wfit to derive constraints. In a flat wCDM model with a CMB prior, the authors report a statistical-only uncertainty of sigma(w)=0.012, a factor of 10 smaller than their DES-SN5YR comparison, and a w0-wa Figure of Merit of 85 (99 with a DESI-BAO-Y1-like prior).
Significance. If the forecast is realized, TiDES would deliver a Hubble diagram of order 143,000 SNe Ia, an order-of-magnitude leap over current SN Ia samples. The paper's strengths are its transparent simulation chain, the use of the 4MOST facility simulator and exposure-time calculator to produce mock spectra, the explicit inclusion of multiple non-Ia transient classes in the simulation, and the clear statement in Section 5.3 that the quoted constraints are statistical-only. The central claim, however, rests on several assumptions that are acknowledged but not stress-tested, most importantly perfect photometric typing of the 131,000-host sample that dominates the cosmological forecast. The abstract also presents the headline precision without the statistical-only caveat. The result is a useful survey description and a defensible first forecast, but the sub-2% w claim is not yet established as robust against realistic classification contamination.
major comments (3)
- [§5 (first paragraph) and §5.2] The assumption of perfect photometric typing for the ~131,000 host-sample SNe Ia is load-bearing. The forecast pipeline in Sections 5.1-5.3 applies SALT2 quality cuts and BBC bias corrections but includes no contamination term: the simulated non-Ia populations of Table 1 are removed perfectly by construction, as stated in the opening of Section 5. Realistic photometric classifiers have a few per cent contamination, dominated by core-collapse SNe at z>0.3 and by 91bg/Iax events at low z; even 1% contamination of the 131,000-host sample would inject ~1,300 non-Ia events with biased distance estimates that the 1D BBC corrections, estimated from the same contamination-free simulation, cannot remove. The paper should include a contamination-inclusive forecast or an analytic degradation estimate before claiming sub-2% w precision; as written, the claim is an upper limit under a perfect-classification scenario.
- [Abstract and §6] The abstract's claim of being 'capable of a sub-2 per cent measurement of the equation-of-state of dark energy' omits the qualifier that this is a statistical-only uncertainty, even though Section 5.3 and the final bullet of Section 6 explicitly describe the result as 'statistical-only precision.' Section 1 itself notes that current SN samples have a systematic error budget comparable to the statistical uncertainty. The abstract and the first paragraph of Section 6 should state the statistical-only caveat, otherwise the headline claim is materially stronger than the forecast supports.
- [§5 (external low-z sample)] The forecast includes an external low-z sample of 2,400 SNe, but the text immediately notes that this sample size 'will only be achieved towards the end of 10-years of LSST operations, even though TiDES is expected to conclude after the first five years of LSST.' The contours in Figures 12 and 13 therefore do not represent a standalone 5-year TiDES projection; they assume a post-TiDES external sample whose availability is itself a scheduling assumption. The paper should present this explicitly as a scenario with an external low-z sample and, ideally, show how the constraints degrade without it.
minor comments (4)
- [§4.2] There is a typo in the sentence 'we assume every galaxy reaching our SSC has had a redshift sucessfully measured': 'sucessfully' should be 'successfully'.
- [§5.3] The code name 'wfit.exe' should be formatted as a code/software name without the '.exe' suffix, or the suffix should be explained if it is intentional.
- [Table 1 caption] The table caption contains a stray space in 'T able 1'; it should read 'Table 1'.
- [§6 and Figure 12 caption] In the Section 6 bullet, 'equations-of-state parameter' should be 'equation-of-state parameter', and 'at-least 143 000 objects' should be 'at least 143 000 objects'; in Figure 12, 'dotted-dashed contours' is more conventionally rendered as 'dot-dashed contours'.
Circularity Check
No significant circularity: TiDES's sub-2% w forecast is a self-contained simulation projection, not a fitted result.
full rationale
The paper's central claim, a statistical-only uncertainty of 0.012 on w, is a forecast derived from an explicit end-to-end simulation pipeline described in Sections 3 through 5, not a measurement fitted to the quantity it claims to predict. SNe Ia are simulated with SALT2 using assumed cosmology, rates, and templates; LSST and 4MOST strategies are simulated; light curves are fit with SALT2; BBC bias corrections are estimated from the same simulated survey and applied; and the final covariance is computed with wfit. Estimating selection corrections from the same simulation is self-referential in the sense that the forecast inherits all simulation assumptions, but it is not definitionally circular: the output uncertainty is computed from the statistical covariance of the simulated sample, not assumed as an input, and no fitted parameter is renamed as a prediction. The assumption of perfect photometric typing for the 131,000-host sample is a strong limitation on the realism of the forecast, and the abstract's 'sub-2 per cent' phrasing drops the 'statistical-only' caveat stated in Section 5.3, but these are accuracy and robustness concerns, not circularity. Self-citations in the paper, such as V19 templates and Frohmaier et al. rates, supply externally anchored empirical inputs rather than the target result. The comparison against a DES-SN5YR-like simulation and the external low-z sample provides an external benchmark. Therefore, no specific circular step can be quoted, and the score is 0.
Assumptions & free parameters
free parameters (6)
- SN Ia stretch-luminosity coefficient alpha =
0.14
- SN Ia colour-luminosity coefficient beta =
3.1
- SN Ia absolute magnitude M_B =
-19.365 mag
- SN Ia volumetric rate normalization =
Frohmaier et al. (2019) Eq. 6
- AGN lag-luminosity relation parameters =
Bentz et al. (2009) with 0.9 Mg II scaling; Penton et al. (2022) for C IV
- Target selection thresholds =
r < 22.5, SNR15A >= 3 or 5, host r <= 24, etc.
assumptions (7)
- domain assumption Flat wCDM cosmology with Omega_M = 0.315 and H0 = 70 km/s/Mpc
- domain assumption SALT2 SED model accurately represents SN Ia spectra and light curves
- domain assumption LSST OpSim v3.4 baseline and the 4MOST mock strategy are representative of the real surveys
- ad hoc to paper Perfect photometric typing for host-sample SNe Ia
- ad hoc to paper Every galaxy reaching the SNR>=3 per Angstrom criterion has a reliable redshift
- ad hoc to paper The external low-z sample (2,400 SNe) will be available during TiDES analysis
- domain assumption AGN reverberation mapping will recover lags for the selected targets
Cite this review
Pith. "Pith review of TiDES: The 4MOST Time Domain Extragalactic Survey." pith.science (2026). https://pith.science/paper/V27TNA3R
@misc{pith2026250116311,
author = {Pith},
title = {Pith review of: TiDES: The 4MOST Time Domain Extragalactic Survey},
year = {2026},
howpublished = {\url{https://pith.science/paper/V27TNA3R}},
note = {Machine review of arXiv:2501.16311}
}
abstract
The Time Domain Extragalactic Survey (TiDES) conducted on the 4-metre Multi-Object Spectroscopic Telescope (4MOST) will perform spectroscopic follow-up of extragalactic transients discovered in the era of the NSF-DOE Vera C. Rubin Observatory. TiDES will conduct a 5-year survey, covering ${>}14\,000\,\mathrm{square\, degrees}$, and use around 250 000 fibre hours to address three main science goals: (i) spectroscopic observations of ${>}$30 000 live transients, (ii) comprehensive follow-up of ${>}$200 000 host galaxies to obtain redshift measurements, and (iii) repeat spectroscopic observations of Active Galactic Nuclei to enable reverberation mapping studies. The live spectra from TiDES will be used to reveal the diversity and astrophysics of both normal and exotic supernovae across the luminosity-timescale plane. The extensive host-galaxy redshift campaign will allow exploitation of the larger sample of supernovae and improve photometric classification, providing the largest-ever sample of type Ia supernovae, capable of a sub-2 per cent measurement of the equation-of-state of dark energy. Finally, the TiDES reverberation mapping experiment of 700-1,000 AGN will complement the SN Ia sample and extend the Hubble diagram to $z\sim2.5$.
Figures
Figures from the paper (8 more)
Forward citations
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