Open Source High-Resolution Exoplanet Atmosphere Retrievals with POSEIDON
arXiv:2505.09933 · doi:10.3847/1538-3881/adcac7
Abstract
High-resolution spectroscopy (R > 25,000) has opened new opportunities to characterize exoplanet atmospheres from the ground. By resolving individual lines in planetary emission and transmission spectra, one can sensitively probe the chemical inventory and temperature structure of exoplanets. However, a significant challenge to reliable and reproducible atmospheric inferences from high-resolution datasets has been the lack of open source codes for high-resolution retrievals. Here, we present a unified high-resolution retrieval framework, for both emission and transmission spectroscopy, made publicly available within the open source POSEIDON retrieval code. Our high-resolution retrieval framework is fast (typically < 12 hours), accessible (no GPUs required), and well-documented via Python notebooks. We validate our framework by reproducing previous emission retrievals of the hot Jupiter WASP-77Ab and transmission retrievals of the ultra-hot Jupiter WASP-121b. Our results are broadly consistent with those of published works when making the same data detrending assumptions, but we demonstrate that user choices can subtly propagate into retrieved chemical abundances.
Documentation available at https://poseidon-retrievals.readthedocs.io/en/latest/content/retrieval_tutorials.html#high-resolution-retrievals-new
References in corpus (90)
- Detection of an Extrasolar Planet Atmosphere
- batman: BAsic Transit Model cAlculatioN in Python
- Importance Nested Sampling and the MultiNest Algorithm
- The orbital motion, absolute mass, and high-altitude winds of exoplanet HD209458b
- Detection and Characterization of Exoplanets and Disks using Projections on Karhunen-Loeve Eigenimages
- Molecfit: A general tool for telluric absorption correction. I. Method and application to ESO instruments
- A Temperature and Abundance Retrieval Method for Exoplanet Atmospheres
- petitRADTRANS: a Python radiative transfer package for exoplanet characterization and retrieval
- ESPRESSO@VLT -- On-sky performance and first results
- Correcting systematic effects in a large set of photometric lightcurves
- Infrared Transmission Spectroscopy of the Exoplanets HD209458b and XO-1b Using the Wide Field Camera-3 on the Hubble Space Telescope
- Atmospheric Retrieval for Super-Earths: Uniquely Constraining the Atmospheric Composition with Transmission Spectroscopy
- A Precise Water Abundance Measurement for the Hot Jupiter WASP-43b
- Detection of water absorption in the day side atmosphere of HD 189733 b using ground-based high-resolution spectroscopy at 3.2 microns
- A featureless transmission spectrum for the Neptune-mass exoplanet GJ 436b
- Nightside condensation of iron in an ultra-hot giant exoplanet
- Strong Water Absorption in the Dayside Emission Spectrum of the Planet HD 189733b
- HD 209458b in New Light: Evidence of Nitrogen Chemistry, Patchy Clouds and Sub-Solar Water
- Retrieving Temperatures and Abundances of Exoplanet Atmospheres with High-Resolution Cross-Correlation Spectroscopy
- Atomic iron and titanium in the atmosphere of the exoplanet KELT-9b
- Rotation and winds of exoplanet HD 189733 b measured with high-dispersion transmission spectroscopy
- A spectral survey of an ultra-hot Jupiter: Detection of metals in the transmission spectrum of KELT-9 b
- Detection of carbon monoxide in the high-resolution day-side spectrum of the exoplanet HD 189733b
- Detection of Fe I in the atmosphere of the ultra-hot Jupiter WASP-121b, and a new likelihood-based approach for Doppler-resolved spectroscopy
- Early Release Science of the exoplanet WASP-39b with JWST NIRCam
- The HST PanCET Program: Exospheric Mg II and Fe II in the Near-UV transmission spectrum of WASP-121b using Jitter Decorrelation
- A solar C/O and sub-solar metallicity in a hot Jupiter atmosphere
- Five carbon- and nitrogen-bearing species in a hot giant planet's atmosphere
- Atmospheric Reconnaissance of TRAPPIST-1 b with JWST/NIRISS: Evidence for Strong Stellar Contamination in the Transmission Spectra
- PEPSI: The high-resolution echelle spectrograph and polarimeter for the Large Binocular Telescope
- High-Resolution Spectroscopic Detection of TiO and Stratosphere in the Day-side of WASP-33b
- A broadband thermal emission spectrum of the ultra-hot Jupiter WASP-18b
- The theory of transmission spectra revisited: a semi-analytical method for interpreting WFC3 data and an unresolved challenge
- Discovery of water at high spectral resolution in the atmosphere of 51 Peg b
- A JWST transmission spectrum of a nearby Earth-sized exoplanet
- SPIRou: the near-infrared spectropolarimeter/high-precision velocimeter for the Canada-France-Hawaii telescope
- A framework to combine low- and high-resolution spectroscopy for the atmospheres of transiting exoplanets
- Exoplanet atmospheres with GIANO. I. Water in the transmission spectrum of HD 189733b
- Hot Exoplanet Atmospheres Resolved with Transit Spectroscopy (HEARTS) III. Atmospheric structure of the misaligned ultra-hot Jupiter WASP-121b
- Non-negative Matrix Factorization: Robust Extraction of Extended Structures
- Where is the Water? Jupiter-like C/H ratio but strong HO depletion found on Boötis b using SPIRou
- A secondary atmosphere on the rocky exoplanet 55 Cancri e
- A High Internal Heat Flux and Large Core in a Warm Neptune Exoplanet
- On the robustness of analysis techniques for molecular detections using high resolution exoplanet spectroscopy
- Double Trouble: Two Transits of the Super-Earth GJ 1132 b Observed with JWST NIRSpec G395H
- An Atomic Spectral Survey of WASP-76b: Resolving Chemical Gradients and Asymmetries
- JWST/NIRISS reveals the water-rich "steam world" atmosphere of GJ 9827 d
- Vanadium oxide and a sharp onset of cold-trapping on a giant exoplanet
- Searching for Thermal Inversion Agents in the Transmission Spectrum of MASCARA-2b/KELT-20b: Detection of Neutral Iron and Ionised Calcium HK Lines
- Non-detection of TiO and VO in the atmosphere of WASP-121b using high-resolution spectroscopy
- Relative abundance constraints from high-resolution optical transmission spectroscopy of WASP-121b, and a fast model-filtering technique for accelerating retrievals
- POSEIDON: A Multidimensional Atmospheric Retrieval Code for Exoplanet Spectra
- Detection of ionized calcium in the atmosphere of the ultra-hot Jupiter KELT-9b
- Multiple water band detections in the CARMENES near-infrared transmission spectrum of HD 189733 b
- Search for water in a super-Earth atmosphere: High-resolution optical spectroscopy of 55 Cancri e
- The Roasting Marshmallows Program with IGRINS on Gemini South I: Composition and Climate of the Ultra Hot Jupiter WASP-18 b
- A temperature inversion with atomic iron in the ultra-hot dayside atmosphere of WASP-189b
- First Detection of Hydroxyl Radical Emission from an Exoplanet Atmosphere: High-dispersion Characterization of WASP-33b using Subaru/IRD
- TRIDENT: A Rapid 3D Radiative Transfer Model for Exoplanet Transmission Spectra
- Retrieval survey of metals in six ultra-hot Jupiters: Trends in chemistry, rain-out, ionisation and atmospheric dynamics
- Atmospheric Retrieval of Exoplanets
- A Significant Increase in Detection of High-Resolution Emission Spectra Using a Three-Dimensional Atmospheric Model of a Hot Jupiter
- An inventory of atomic species in the atmosphere of WASP-121b using UVES high-resolution spectroscopy
- Near-Infrared Transmission Spectroscopy of HAT-P-18b with NIRISS: Disentangling Planetary and Stellar Features in the Era of JWST
- HyDRA-H: Simultaneous Hybrid Retrieval of Exoplanetary Emission Spectra
- Spatially-resolving the terminator: Variation of Fe, temperature and winds in WASP-76 b across planetary limbs and orbital phase
- Awesome SOSS: Atmospheric Characterisation of WASP-96 b using the JWST Early Release Observations
- Detection of barium in the atmospheres of the ultra-hot gas giants WASP-76b and WASP-121b
- Evidence for the Direct Detection of the Thermal Spectrum of the Non-Transiting Hot Gas Giant HD 88133 b
- High-resolution transmission spectroscopy study of ultra-hot Jupiters HAT-P-57b, KELT-17b, KELT-21b, KELT-7b, MASCARA-1b, and WASP-189b
- Robustness Measures for Molecular Detections using High-Resolution Transmission Spectroscopy of Exoplanets
- High-resolution atmospheric retrievals of WASP-121b transmission spectroscopy with ESPRESSO: Consistent relative abundance constraints across multiple epochs and instruments
- CRIRES+ and ESPRESSO reveal an atmosphere enriched in volatiles relative to refractories on the ultra-hot Jupiter WASP-121b
- Black Mirror: The impact of rotational broadening on the search for reflected light from 51 Pegasi b with high resolution spectroscopy
- HST PanCET Program: A Complete Near-UV to Infrared Transmission Spectrum for the Hot Jupiter WASP-79b
- A Comprehensive Analysis of WASP-17b's Transmission Spectrum from Space-Based Observations
- A survey of sodium absorption in ten giant exoplanets with high-resolution transmission spectroscopy
- Detection of Ionized Calcium in the Atmosphere of the Ultra-Hot Jupiter WASP-76b
- CO Detected in CI Tau b: Hot Start Implied by Planet Mass and M
- A Catalogue of Exoplanet Atmospheric Retrieval Codes
- Community targets for JWST's early release science program: evaluation of WASP-63b
- The PEPSI Exoplanet Transit Survey (PETS). II. A Deep Search for Thermal Inversion Agents in KELT-20 b/MASCARA-2 b with Emission and Transmission Spectroscopy
- GRACES: Gemini remote access to CFHT ESPaDOnS Spectrograph through the longest astronomical fiber ever made (Experimental phase completed.)
- MAROON-X: The first two years of EPRVs from Gemini North
- High-Resolution Transmission Spectroscopy of the Terrestrial Exoplanet GJ 486b
- High-resolution emission spectroscopy retrievals of MASCARA-1b with CRIRES+: Strong detections of CO, HO and Fe emission lines and a CO consistent with solar
- A retrieval challenge exercise for the Ariel mission
- A formally motivated retrieval framework applied to the high resolution transmission spectrum of HD 189733 b
- Simulating the Multi-Epoch Direct Detection Technique to Isolate the Thermal Emission of the Non-Transiting Hot Jupiter HD187123B
- A Time-Resolved High-Resolution Spectroscopic Analysis of Ionized Calcium and Dynamical Processes in the Ultra-Hot Jupiter HAT-P-70 b