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arxiv: 2604.05907 · v1 · submitted 2026-04-07 · 🌌 astro-ph.EP

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The Transit Timing and Transmission Spectrum of Hot Jupiter WASP-43 b from a decade of Multi-band Transit Follow-up Observations

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Pith reviewed 2026-05-10 18:54 UTC · model grok-4.3

classification 🌌 astro-ph.EP
keywords WASP-43 bhot Jupitertransit timing variationsorbital decaytransmission spectroscopyatmospheric retrievalmulti-instrument observations
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The pith

Observations of hot Jupiter WASP-43 b over a decade show no significant orbital decay while revealing modeling difficulties when combining atmospheric spectra from multiple instruments.

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

The paper combines 35 new ground-based transit light curves of WASP-43 b with existing ground, TESS, HST, and JWST data to update the planet's parameters and search for timing changes. Analysis of 188 mid-transit times finds no clear signs that the orbit is decaying. Atmospheric retrievals on the HST transmission spectrum alone link higher temperatures to higher water abundances, but adding data from other instruments creates wavelength-dependent complexities that prevent firm atmospheric conclusions. The work shows that consistent high-precision observations across instruments will be required to resolve these issues for this planet.

Core claim

Transit timing variations measured from 188 mid-transit times spanning a decade exhibit no significant evidence of orbital decay. Atmospheric retrievals applied to HST/WFC3 G141 transmission spectra indicate that solutions with higher temperatures are associated with higher water abundances, but combining these spectra with ground-based, TESS, and JWST observations across a wide wavelength range introduces substantial modeling challenges that limit atmospheric characterization.

What carries the argument

Collection and joint analysis of 188 mid-transit times from multi-band observations, together with atmospheric retrieval modeling performed on HST spectra and then extended to broader wavelength datasets.

If this is right

  • The orbit of WASP-43 b remains stable with no detectable decay over the ten-year baseline.
  • Higher-temperature atmospheric models for this planet correspond to higher water abundances when using HST data alone.
  • Broad-wavelength datasets increase the number of free parameters and degeneracies in atmospheric retrievals.
  • High-precision, multi-instrument observations will be needed to break current degeneracies in the atmosphere of this target.

Where Pith is reading between the lines

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

  • Similar timing analyses on other short-period hot Jupiters could test whether the lack of decay seen here is typical or exceptional.
  • Unquantified instrument-to-instrument differences may affect retrieval results for many exoplanets observed with mixed ground and space facilities.
  • Future work could test whether restricting retrievals to narrow, well-calibrated wavelength windows yields more stable abundance estimates before attempting full-spectrum fits.
  • Repeated observations with a single stable instrument over time could isolate whether the temperature-water correlation persists independently of dataset combination.

Load-bearing premise

Standard transit-fitting software and atmospheric retrieval models can be applied to observations from different instruments without introducing large unaccounted systematics that alter the combined results.

What would settle it

A new set of transit times collected over the next several years that either shows a clear, steady decrease in orbital period or yields consistent water abundance and temperature values when retrievals are run on uniformly calibrated spectra from all instruments.

Figures

Figures reproduced from arXiv: 2604.05907 by Akshay Priyadarshi, Ananpol Sudsap, Boonyarit Choonhakit, Eamonn Kerins, Ekburus Boonsoy, Fan Yang, Iain McDonald, Ida Janiak, Ing-Guey Jiang, Napaporn A-thano, Nuanwan Sanguansak, Orarik Tasuya, Patcharawee Munsaket, Rattiyakorn Rattanasai, Ronnakrit Rattanamala, Sawatkamol Pichadee, Siramas Komonjinda, Smanchan Chandaiam, Supachai Awiphan, Suwanit Wutsang, Thammasorn Padjaroen, Vik S Dhillon, Yasir Abdul Qadir, Yogesh C. Joshi.

Figure 1
Figure 1. Figure 1: Left panels: The normalized, phase-folded transit light curves of WASP-43 b from the 2.4-m and 1-m TNT observa￾tions in the SPEARNET telescope network, shown as grey dots. The best-fitting model from TransitFit is displayed as a solid line. Right panels: Residuals of the light curves after model subtraction. Both the light curves and residuals are vertically offset for clarity. The corresponding residuals … view at source ↗
Figure 2
Figure 2. Figure 2: The normalized, phase-folded transit light curves of WASP-43 b are shown for HST/WFC3 G141 observations on November 15, 2013 (upper left), TESS observations within Sector 9 (upper right), and JWST/MIRI (bottom). The observational data are presented as dots, and the best-fitting model from TransitFit is shown as solid lines. Both the light curves and the corresponding residuals (right panels) are vertically… view at source ↗
Figure 3
Figure 3. Figure 3: The O − C diagram and best-fitting timing models for WASP-43 b, including data from the literature (grey circles), HST (pink circles), TESS (blue circles), JWST (green circles), and this study (red circles), are shown. The orange line represents the timing residuals of the orbital decay model. 10−3 10−2 10−1 Frequency [cycle/period] 0.0 0.1 0.2 0.3 0.4 Power FAP = 9 x 10−7 % FAP = 0.1 % FAP = 0.5 % [PITH_… view at source ↗
Figure 4
Figure 4. Figure 4: The GLS periodograms were calculated for the timing residuals of a total of 188 epochs. The dashed line indicates the FAP levels. The highest power peak was found at a frequency of 0.01657 ± 0.00001 cycles/day, with a FAP of 9 × 10−7%. that the lowest ∆χ 2 red values are close to the upper mass limit corresponding to a TTV amplitude of 15 seconds. In the unstable orbit region with an orbital period rang￾in… view at source ↗
Figure 5
Figure 5. Figure 5: The O − C diagram for the TESS data sets. (a) The O − C data from observations in TESS three sectors over a five-year interval. (b)-(e) The O − C data plotted by individual sectors for clearer visibility. work TauREx3 (Al-Refaie et al. 2021) 9 , which uses the nested sampling routines from MultiNest (Feroz et al. 2009) with 1000 live points to determine the atmospheric parameters. For the transmission spec… view at source ↗
Figure 6
Figure 6. Figure 6: The GLS periodograms of the timing residuals for TESS data show that the highest power peak was found at a frequency of 0.33017 ± 0.00005 cycles/day with a False Alarm Probability (FAP) of 29.7% [PITH_FULL_IMAGE:figures/full_fig_p014_6.png] view at source ↗
Figure 7
Figure 7. Figure 7: Upper mass limit of the perturbing planet in the WASP-43 system. The best ∆χ 2 red values, binned with a period ratio of 0.05, are shown as the black dotted line. The upper mass limits for TTV amplitudes of 5, 15, and 25 seconds are represented by the blue dash-dotted, green dashed, and red solid lines, respectively. The white vertical line represents the orbital period of WASP-43 b. The black vertical lin… view at source ↗
Figure 8
Figure 8. Figure 8: The HST transmission spectrum of WASP-43 b, reduced using Iraclis (pink) and TransitFit (dark-red). STScI is operated by the AURA, Inc., under NASA con￾tract NAS 5–26555. The specific observations analyzed can be accessed via https://doi.org/10.17909/T97P46 and https://doi.org/10.17909/t9-nmc8-f686, respec￾tively. This work also used the data based on obser￾vations made with the NASA/ESA/CSA James Webb Spa… view at source ↗
Figure 9
Figure 9. Figure 9: The best-fit transmission spectrum model of WASP-43 b derived from HST data. The synthetic model generated by TauREx is shown as a solid blue line, with the corresponding 1σ confidence region indicated by the blue shading. The binned best-fit model values are shown as blue squares. The transit depths computed with Iraclis and TransitFit are shown as pink and dark-red dots, respectively [PITH_FULL_IMAGE:fi… view at source ↗
Figure 10
Figure 10. Figure 10: The best-fit transmission spectrum model of WASP-43 b, calculated for the combined dataset including ground￾based observations (grey dots), TESS (light-blue dots), HST processed with Iraclis (pink dots), HST processed with TransitFit (dark-red dots), and JWST (green dots). The synthetic model generated by TauREx is shown as a solid blue line, with the corresponding 1σ confidence region indicated by the bl… view at source ↗
read the original abstract

We present a new set of 35 transit light curves of the hot Jupiter WASP-43~b, obtained through the SPEARNET network. These datasets were analyzed together with previously published ground-based observations, as well as space-based data from \emph{TESS}, \emph{HST}, and \emph{JWST}, to refine the planetary parameters of WASP-43~b. A total of 188 mid-transit times, measured with \texttt{TransitFit}, were analyzed for potential timing variations. The transit timing variations do not show any significant evidence of orbital decay. Atmospheric retrievals using \emph{HST}/WFC3 G141 transmission spectra suggest that higher-temperature solutions are associated with higher water abundances. However, when these data are combined with observations from ground-based telescopes, \emph{TESS}, and \emph{JWST}, the increased modeling complexity across the broad wavelength baseline presents significant challenges for atmospheric characterization. These results highlight that high-precision, multi-instrument datasets will be necessary to break existing degeneracies in the atmospheric modeling of this target in the future.

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

0 major / 3 minor

Summary. This paper reports 35 new multi-band transit light curves of hot Jupiter WASP-43 b from the SPEARNET network, combined with archival ground-based, TESS, HST, and JWST observations. A total of 188 mid-transit times measured with TransitFit are analyzed for timing variations, yielding no significant evidence of orbital decay. Atmospheric retrievals on HST/WFC3 G141 transmission spectra indicate that higher-temperature solutions correlate with higher water abundances, while noting that combining data across instruments introduces substantial modeling challenges and degeneracies.

Significance. If the results hold, the decade-long timing baseline supplies a clear null detection on orbital decay for this well-studied hot Jupiter, adding to constraints on tidal evolution. The atmospheric section usefully illustrates degeneracies in retrievals and the limits of current multi-instrument datasets. Credit is due for the large homogeneous timing sample, use of standard software (TransitFit) for reproducibility, and the appropriately cautious framing of the HST-only retrieval result rather than overclaiming a multi-instrument solution.

minor comments (3)
  1. [Abstract] Abstract: the statement that 'higher-temperature solutions are associated with higher water abundances' would be strengthened by a brief parenthetical note on the retrieval code or free parameters used (e.g., whether clouds or metallicity were fixed).
  2. [TTV analysis] TTV analysis section: while the null result on decay is stated, the manuscript should report the quantitative upper limit on any period derivative (e.g., dP/dt < X s/yr at 3σ) or the likelihood ratio between constant-period and decaying-orbit models to make the 'no significant evidence' claim more precise.
  3. [Atmospheric retrieval] Atmospheric retrieval section: an explicit statement of how the reported temperature-water correlation was quantified (e.g., Spearman coefficient or marginalized posterior) would help readers evaluate its robustness given the acknowledged degeneracies.

Simulated Author's Rebuttal

0 responses · 0 unresolved

We thank the referee for their positive assessment of the manuscript, including recognition of the homogeneous timing sample, use of TransitFit for reproducibility, and the appropriately cautious framing of the HST-only retrieval results. We appreciate the recommendation for minor revision.

Circularity Check

0 steps flagged

No significant circularity in derivation chain

full rationale

The paper reports direct measurements of 188 mid-transit times from multi-instrument data using the standard TransitFit package, yielding a null result on orbital decay with no claimed detection or tight constraint. Atmospheric retrievals on HST/WFC3 G141 spectra are presented as empirical associations (higher T with higher H2O) accompanied by explicit caveats on degeneracies when combining with ground-based/TESS/JWST data. No steps reduce by construction to fitted inputs, no uniqueness theorems or ansatzes are imported via self-citation, and no predictions are statistically forced from subsets of the same data. All claims derive from external observations and established analysis methods without internal redefinition or load-bearing self-references.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

The work rests on standard domain assumptions in transit photometry and atmospheric retrieval; no novel entities are introduced. Specific free parameters typical of light-curve fitting (limb darkening, baseline trends) are implied but not enumerated in the abstract.

axioms (1)
  • domain assumption Standard assumptions in transit photometry and atmospheric retrieval hold across instruments
    The analysis assumes no significant unaccounted instrumental systematics when combining ground-based, TESS, HST, and JWST data.

pith-pipeline@v0.9.0 · 5648 in / 1102 out tokens · 64655 ms · 2026-05-10T18:54:17.998484+00:00 · methodology

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