Probing Na in giant exoplanets with ESPRESSO and 3D NLTE stellar spectra
arXiv:2410.15810 · doi:10.1051/0004-6361/202451972
Abstract
Neutral sodium was the first atom detected in an exoplanetary atmosphere via transmission spectroscopy and remains the most frequently detected species due to its strong doublet in the optical. However, the center-to-limb variation (CLV) of these lines in the host star can bias the Na detection.When combined with the Rossiter-McLaughlin (RM) effect, the CLV can mimic or obscure planetary absorption features. This work investigates the impact of 3D radiation hydrodynamic stellar atmospheres and non-local thermodynamic equilibrium (NLTE) radiative transfer on the modeling of the CLV+RM effect in single-line transmission spectroscopy, to improve the characterization of exoplanet atmospheres. We produced a grid of 3D NLTE synthetic spectra for Na I for FGK stars within the following parameter space: Teff=4500-6500 K, log g=4.0-5.0 and [Fe/H]=-0.5, 0, 0.5.This grid was then interpolated to match the stellar parameters of four stars hosting giant exoplanets, to correct for the CLV+RM effect in their transmission spectra. We used ESPRESSO archival observations. Our work confirms the Na detections in three systems, namely WASP-52b, WASP-76b, and WASP-127b, improving the accuracy of the measured absorption depth. Furthermore, we find that 3D NLTE stellar models can explain the spectral features in HD 209458b without the need for any planetary absorption. In the grid of synthetic spectra, we observe that the CLV effect is stronger for stars with low Teff and high log g. However, the combined effect of CLV and RM is highly dependent on the orbital geometry of the planet-star system. With the continuous improvement of instrumentation, it is crucial to use the most accurate stellar models to correct for the CLV+RM effect in high-resolution transmission spectra, to achieve the best possible characterization of exoplanet atmospheres. We make our grid of 3D NLTE spectra for Na publicly available.
Accepted for publication in A&A, 17 pages (23 with appendices)
References in corpus (58)
- Gaia Data Release 3: Summary of the content and survey properties
- A grid of MARCS model atmospheres for late-type stars I. Methods and general properties
- The James Webb Space Telescope
- Molecfit: A general tool for telluric absorption correction. I. Method and application to ESO instruments
- The chemical make-up of the Sun: A 2020 vision
- The GALAH+ Survey: Third Data Release
- ESPRESSO@VLT -- On-sky performance and first results
- Improved parameters for extrasolar transiting planets
- Molecfit: A general tool for telluric absorption correction II. Quantitative evaluation on ESO-VLT X-Shooter spectra
- Sodium Absorption From the Exoplanetary Atmosphere of HD189733b Detected in the Optical Transmission Spectrum
- The imprint of exoplanet formation history on observable present-day spectra of hot Jupiters
- Spectrally resolved detection of sodium in the atmosphere of HD189733b with the HARPS spectrograph
- Ground-based detection of sodium in the transmission spectrum of exoplanet HD209458b
- Using Stellar Limb-Darkening to Refine the Properties of HD 209458b
- Non-LTE line formation of Fe in late-type stars - III. 3D non-LTE analysis of metal-poor stars
- HST/STIS Optical Transit Transmission Spectra of the hot-Jupiter HD209458b
- Hot Exoplanet Atmospheres Resolved with Transit Spectroscopy (HEARTS) IV. A spectral inventory of atoms and molecules in the high-resolution transmission spectrum of WASP-121 b
- Atmospheric Rossiter-McLaughlin effect and transmission spectroscopy of WASP-121b with ESPRESSO
- Non-LTE aluminium abundances in late-type stars
- WASP-42 b and WASP-49 b: two new transiting sub-Jupiters
- Stellar chromospheric activity of 1,674 FGK stars from the AMBRE-HARPS sample I. A catalogue of homogeneous chromospheric activity
- Transit spectroscopy with JWST: Systematics, starspots and stitching
- Hot Exoplanet Atmospheres Resolved with Transit Spectroscopy (HEARTS) - II. A broadened sodium feature on the ultra-hot giant WASP-76b
- Ionized calcium in the atmospheres of two ultra-hot exoplanets WASP-33b and KELT-9b
- Detection of sodium in the atmosphere of WASP-69b
- ESPRESSO high resolution transmission spectroscopy of WASP-76b
- The GALAH Survey: Non-LTE departure coefficients for large spectroscopic surveys
- An Atomic Spectral Survey of WASP-76b: Resolving Chemical Gradients and Asymmetries
- Solar oxygen abundance
- 3D NLTE spectral line formation of lithium in late-type stars
- From dense hot Jupiter to low-density Neptune: The discovery of WASP-127b, WASP-136b and WASP-138b
- The atmosphere of HD 209458b seen with ESPRESSO. No detectable planetary absorptions at high resolution
- Into the Storm: Diving into the winds of the ultra hot Jupiter WASP-76 b with HARPS and ESPRESSO
- WASP-127b: A misaligned planet with a partly cloudy atmosphere and tenuous sodium signature seen by ESPRESSO
- Transmission spectroscopy of the inflated exoplanet WASP-52b, and evidence for a bright region on the stellar surface
- A Spitzer Infrared Radius for the Transiting Extrasolar Planet HD209458b
- Carbon and oxygen in metal-poor halo stars
- Alkaline Exospheres of Exoplanet Systems: Evaporative Transmission Spectra
- WASP-52b. The effect of starspot correction on atmospheric retrievals
- Hot Exoplanet Atmospheres Resolved with Transit Spectroscopy (HEARTS) VI. Non-detection of sodium with HARPS on the bloated super-Neptune WASP-127b
- The centre-to-limb variations of solar Fraunhofer lines imprinted upon lunar eclipse spectra - Implications for exoplanet transit observations
- A survey of sodium absorption in ten giant exoplanets with high-resolution transmission spectroscopy
- Planet and star synergy at high spectral resolution. A rationale for the characterisation of exoplanet atmospheres. I. The Infrared
- Phase curve pollution of exoplanet transmission spectra
- Exoplanet atmospheres at high resolution through a modest-size telescope. Fe II in MASCARA-2b and KELT-9b with FIES on the Nordic Optical Telescope
- A comparative study of two X2.2 and X9.3 solar flares observed with HARPS-N: Reconciling Sun-as-a-star spectroscopy and high-spatial resolution solar observations in the context of the solar-stellar connection
- The IAG spectral atlas of the spatially resolved Sun: Centre-to-limb observations
- Broadband transmission spectroscopy of HD209458b with ESPRESSO: Evidence for Na, TiO, or both
- An atlas of resolved spectral features in the transmission spectrum of WASP-189 b with MAROON-X
- The GAPS programme at TNG. XLV. HI Balmer lines transmission spectroscopy and NLTE atmospheric modelling of the ultra-hot Jupiter KELT-20b/MASCARA-2b
- Combined analysis of stellar and planetary absorption lines via global forward-transit simulations
- An extended and refined grid of 3D STAGGER model atmospheres. Processed snapshots for stellar spectroscopy
- Spatially resolved spectroscopy across stellar surfaces. IV. F, G, & K-stars: Synthetic 3D spectra at hyper-high resolution
- Center--limb variation of solar photospheric microturbulence
- Solar center-to-limb variation in Rossiter-McLaughlin and exoplanet transmission spectroscopy
- Exploring the stellar surface phenomena of WASP-52 and HAT-P-30 with ESPRESSO
- The strange case of Na I in the atmosphere of HD209458 b: Reconciling low- and high-resolution spectroscopic observations G
- Atmospheric composition of WASP-85Ab with ESPRESSO/VLT observations
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- Transmission spectroscopy of WASP-52 b with JWST NIRISS: Water and helium atmospheric absorption, alongside prominent star-spot crossings
- The peculiar composition of the Sun is not related to giant planets
- The GAPS programme at TNG LXVI. A homogeneous search for Na i and its possible variability in ten gas giant exoplanets
- The ESPRESSO transmission spectrum of HD189733b : Extracting the planetary sodium and lithium signatures amid stellar contamination
- The R-Process Alliance: Exploring the cosmic scatter among ten r-process sites with stellar abundances
- 3D non-LTE Ca II line formation in metal-poor FGK stars. I. Abundance corrections, radial velocity corrections, and synthetic spectra
- Probing the extent of WASP-52 b's atmosphere. High-resolution observations and 3D modeling insights
- The CARMENES search for exoplanets around M dwarfs. A homogeneous catalogue of projected rotational velocities accounting for limb-darkening