The Transit Timing and Transmission Spectrum of Hot Jupiter WASP-43 b from a Decade of Multiband Transit follow-up Observations
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 TESS, Hubble Space Telescope (HST), and JWST, to refine the planetary parameters of WASP-43 b. A total of 188 midtransit times, measured with TransitFit , were analyzed for potential timing variations. The transit timing variations do not show any significant evidence of orbital decay. Atmospheric retrievals using 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, TESS, and 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.
Authors
- Vik. S. Dhillon
- Smanchan Chandaiam
- Ronnakrit Rattanamala (ORCID: https://orcid.org/0009-0006-3356-0348)
- O. Tasuya
- Napaporn A-thano (ORCID: https://orcid.org/0000-0001-7234-7167)
- Patcharawee Munsaket
- Suwanit Wutsang
- Akshay Priyadarshi (ORCID: https://orcid.org/0000-0003-1143-0877)
- Supachai Awiphan (ORCID: https://orcid.org/0000-0003-3251-3583)
- Siramas Komonjinda (ORCID: https://orcid.org/0000-0001-7987-017X)
- Yasir Abdul Qadir (ORCID: https://orcid.org/0000-0001-5162-4225)
- Rattiyakorn Rattanasai
- Nuanwan Sanguansak
- Ekburus Boonsoy
- Ananpol Sudsap
- Thammasorn Padjaroen
- Ida Janiak
- Sawatkamol Pichadee
- Iain McDonald (ORCID: https://orcid.org/0000-0003-0356-0655)
- Ing-Guey Jiang (ORCID: https://orcid.org/0000-0001-7359-3300)
- Fan Yang (ORCID: https://orcid.org/0000-0002-6039-8212)
- Boonyarit Choonhakit
- Yogesh C. Joshi (ORCID: https://orcid.org/0000-0001-8657-1573)
- Eamonn Kerins (ORCID: https://orcid.org/0000-0002-1743-4468)
Institutions
- Centre National de la Recherche Scientifique (FR)
- National Science and Technology Development Agency (TH)
- University of Turku (FI)
- The Open University (GB)
- National Tsing Hua University (TW)
- Commissariat à l'Énergie Atomique et aux Énergies Alternatives (FR)
- Université Paris-Saclay (FR)
- Aryabhatta Research Institute of Observational Sciences (IN)
- University of Manchester (GB)
- Astrophysique, Instrumentation et Modélisation (FR)
- CEA Paris-Saclay (FR)
- Instituto de Astrofísica de Canarias (ES)
- Nakhon Ratchasima Rajabhat University (TH)
- Institut de Recherche sur les Lois Fondamentales de l'Univers (FR)
- Chiang Mai University (TH)
- Suranaree University of Technology (TH)
- National Astronomical Research Institute of Thailand (TH)
- University of Sheffield (GB)
Publication Details
- Journal
- The Astronomical Journal
- Published
- 2026-05-01
- DOI
- https://doi.org/10.3847/1538-3881/ae5b78
- Primary Topic
- Stellar, planetary, and galactic studies
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- National Astronomical Research Institute of Thailand
- Thailand Science Research and Innovation