140 research outputs found
Temperature–chemistry coupling in the evolution of gas giant atmospheres driven by stellar flares
The effect of enhanced UV irradiation associated with stellar flares on the atmospheric composition and temperature of gas giant exoplanets was investigated. This was done using a 1D radiative-convective-chemical model with self-consistent feedback between the temperature and the non-equilibrium chemistry. It was found that flare-driven changes to chemical composition and temperature give rise to prolonged trends in evolution across a broad range of pressure levels and species. Allowing feedback between chemistry and temperature plays an important role in establishing the quiescent structure of these atmospheres, and determines their evolution due to flares. It was found that cooler planets are more susceptible to flares than warmer ones, seeing larger changes in composition and temperature, and that temperature–chemistry feedback modifies their evolution. Long-term exposure to flares changes the transmission spectra of gas giant atmospheres; these changes differed when the temperature structure was allowed to evolve self-consistently with the chemistry. Changes in spectral features due to the effects of flares on these atmospheres can be associated with changes in composition. The effects of flares on the atmospheres of sufficiently cool planets will impact observations made with JWST. It is necessary to use self-consistent models of temperature and chemistry in order to accurately capture the effects of flares on features in the transmission spectra of cooler gas giants, but this depends heavily on the radiation environment of the planet
The atmospheric chemistry of the warm Neptune GJ 3470b: influence of metallicity and temperature on the CH4/CO ratio
Current observation techniques are able to probe the atmosphere of some giant
exoplanets and get some clues about their atmospheric composition. However, the
chemical compositions derived from observations are not fully understood, as
for instance in the case of the CH4/CO abundance ratio, which is often inferred
different from what has been predicted by chemical models. Recently, the warm
Neptune GJ3470b has been discovered and because of its close distance from us
and high transit depth, it is a very promising candidate for follow up
characterisation of its atmosphere. We study the atmospheric composition of
GJ3470b in order to compare with the current observations of this planet, to
prepare the future ones, but also as a typical case study to understand the
chemical composition of warm (sub-)Neptunes. The metallicity of such
atmospheres is totally uncertain, and vary probably to values up to 100x solar.
We explore the space of unknown parameters to predict the range of possible
atmospheric compositions. Within the parameter space explored we find that in
most cases methane is the major carbon-bearing species. We however find that in
some cases, typically for high metallicities with a sufficiently high
temperature the CH4/CO abundance ratio can become lower than unity, as
suggested by some multiwavelength photometric observations of other warm
(sub-)Neptunes, such as GJ1214b and GJ436b. As for the emission spectrum of
GJ3470b, brightness temperatures at infrared wavelengths may vary between 400
and 800K depending on the thermal profile and metallicity. Combined with a hot
temperature profile, a substantial enrichment in heavy elements by a factor of
100 with respect to the solar composition can shift the carbon balance in
favour of carbon monoxide at the expense of CH4. Nevertheless, current
observations of this planet do not allow yet to determine which model is more
accurate.Comment: 12 pages, 8 figures, accepted in Astronomy & Astrophysic
Temperature-chemistry coupling in the evolution of gas giant atmospheres driven by stellar flares
The effect of enhanced UV irradiation associated with stellar flares on the
atmospheric composition and temperature of gas giant exoplanets was
investigated. This was done using a 1D radiative-convective-chemical model with
self-consistent feedback between the temperature and the non-equilibrium
chemistry.
It was found that flare-driven changes to chemical composition and
temperature give rise to prolonged trends in evolution across a broad range of
pressure levels and species. Allowing feedback between chemistry and
temperature plays an important role in establishing the quiescent structure of
these atmospheres, and determines their evolution due to flares. It was found
that cooler planets are more susceptible to flares than warmer ones, seeing
larger changes in composition and temperature, and that temperature-chemistry
feedback modifies their evolution.
Long-term exposure to flares changes the transmission spectra of gas giant
atmospheres; these changes differed when the temperature structure was allowed
to evolve self-consistently with the chemistry. Changes in spectral features
due to the effects of flares on these atmospheres can be associated with
changes in composition. The effects of flares on the atmospheres of
sufficiently cool planets will impact observations made with JWST. It is
necessary to use self-consistent models of temperature and chemistry in order
to accurately capture the effects of flares on features in the transmission
spectra of cooler gas giants, but this depends heavily on the radiation
environment of the planet.Comment: 22 Pages, 22 Figures, Accepted for publication in MNRA
FRECKLL: Full and Reduced Exoplanet Chemical Kinetics distiLLed
We introduce a new chemical kinetic code FRECKLL (Full and Reduced Exoplanet
Chemical Kinetics distiLLed) to evolve large chemical networks efficiently.
FRECKLL employs `distillation' in computing the reaction rates, which minimizes
the error bounds to the minimum allowed by double precision values (). FRECKLL requires less than 5 minutes to evolve the full
Venot2020 network in a 130 layers atmosphere and 30 seconds to evolve the
Venot2020 reduced scheme. Packaged with FRECKLL is a TauREx 3.1 plugin for
usage in forward modelling and retrievals. We present TauREx retrievals
performed on a simulated HD189733 JWST spectra using the full and reduced
Venot2020 chemical networks and demonstrate the viability of total
disequilibrium chemistry retrievals and the ability for JWST to detect
disequilibrium processes.Comment: 13 pages, 8 figure
Grid of pseudo-2D chemistry models for tidally locked exoplanets – II. The role of photochemistry
Funding: RB acknowledges funding from a PhD fellowship of the Research Foundation – Flanders (FWO). OV acknowledges support from the Agence Nationale de la Recherche (ANR), through the project EXACT (ANR-21-CE49-0008-0) and from the CNRS/INSU Programme National de Planétologie (PNP). This work was supported by CNES, focused on the EXACT project and Ariel. LC acknowledges support from the DFG Priority Programme SP1833 Grant CA 1795/3 and the UK Royal Society Grant URF R1 211718. LD acknowledges support from the FWO research grant G086217N. RB, TK, and LD acknowledge support from the KU Leuven IDN/19/028 grant ESCHER.Photochemistry is expected to change the chemical composition of the upper atmospheres of irradiated exoplanets through the dissociation of species, such as methane and ammonia, and the association of others, such as hydrogen cyanide. Although primarily the high altitude day side should be affected by photochemistry, it is still unclear how dynamical processes transport photochemical species throughout the atmosphere, and how these chemical disequilibrium effects scale with different parameters. In this work we investigate the influence of photochemistry in a two-dimensional context, by synthesizing a grid of photochemical models across a large range of temperatures. We find that photochemistry can strongly change the atmospheric composition, even up to depths of several bar in cool exoplanets. We further identify a sweet spot for the photochemical production of hydrogen cyanide and acetylene, two important haze precursors, between effective temperatures of 800 and 1400 K. The night sides of most cool planets (Teff < 1800 K) are shown to host photochemistry products, transported from the day side by horizontal advection. Synthetic transmission spectra are only marginally affected by photochemistry, but we suggest that observational studies probing higher altitudes, such as high-resolution spectroscopy, take photochemistry into account.Publisher PDFPeer reviewe
A re-analysis of equilibrium chemistry in five hot Jupiters
Studying chemistry and chemical composition is fundamental to go back to
formation history of planetary systems. We propose here to have another look at
five targets to better determine their composition and the chemical mechanisms
that take place in their atmospheres. We present a re-analysis of five Hot
Jupiters, combining multiple instruments and using Bayesian retrieval methods.
We compare different combinations of molecules present in the simulated
atmosphere, different chemistry types as well as different clouds
parametrization. As a consequence of recent studies questioning the detection
of Na and K in the atmosphere of HD 209458b as being potentially contaminated
by stellar lines when present, we study the impact on other retrieval
parameters of misinterpreting the presence of these alkali species. We use
spatially scanned observations from the grisms G102 and G141 of the WFC3 on
HST, with a wavelength coverage of 0.8 to 1.7 microns. We analyse
these data with the publicly available Iraclis pipeline. We added to our
datasets STIS observations to increase our wavelength coverage from 0.4
to 1.7 microns. We then performed a Bayesian retrieval analysis with the
open-source TauREx using a nested sampling algorithm. We explore the influence
of including Na and K on the retrieval of the molecules from the atmosphere.
Our data re-analysis and Bayesian retrieval are consistent with previous
studies but we find small differences in the retrieved parameters. After all,
Na and K has no significant impact on the properties of the planet atmospheres.
Therefore, we present here our new best-fit models, taking into account
molecular abundances varying freely and equilibrium chemistry. This work is a
preparation for a future addition of more sophisticated representation of
chemistry taking into account disequilibrium effects such as vertical mixing
and photochemistry.Comment: 19 pages, 14 figure
Exploring the Ability of HST WFC3 G141 to Uncover Trends in Populations of Exoplanet Atmospheres Through a Homogeneous Transmission Survey of 70 Gaseous Planets
We present the analysis of the atmospheres of 70 gaseous extrasolar planets
via transit spectroscopy with Hubble's Wide Field Camera 3 (WFC3). For over
half of these, we statistically detect spectral modulation which our retrievals
attribute to molecular species. Among these, we use Bayesian Hierarchical
Modelling to search for chemical trends with bulk parameters. We use the
extracted water abundance to infer the atmospheric metallicity and compare it
to the planet's mass. We also run chemical equilibrium retrievals, fitting for
the atmospheric metallicity directly. However, although previous studies have
found evidence of a mass-metallicity trend, we find no such relation within our
data. For the hotter planets within our sample, we find evidence for thermal
dissociation of dihydrogen and water via the H opacity. We suggest that the
general lack of trends seen across this population study could be due to i) the
insufficient spectral coverage offered by HST WFC3 G141, ii) the lack of a
simple trend across the whole population, iii) the essentially random nature of
the target selection for this study or iv) a combination of all the above. We
set out how we can learn from this vast dataset going forward in an attempt to
ensure comparative planetology can be undertaken in the future with facilities
such as JWST, Twinkle and Ariel. We conclude that a wider simultaneous spectral
coverage is required as well as a more structured approach to target selection.Comment: Accepted for publication in ApJ
Exploring the Ability of Hubble Space Telescope WFC3 G141 to Uncover Trends in Populations of Exoplanet Atmospheres through a Homogeneous Transmission Survey of 70 Gaseous Planets
We present analysis of the atmospheres of 70 gaseous extrasolar planets via transit spectroscopy with Hubble’s Wide Field Camera 3 (WFC3). For over half of these, we statistically detect spectral modulation that our retrievals attribute to molecular species. Among these, we use Bayesian hierarchical modeling to search for chemical trends with bulk parameters. We use the extracted water abundance to infer the atmospheric metallicity and compare it to the planet’s mass. We also run chemical equilibrium retrievals, fitting for the atmospheric metallicity directly. However, although previous studies have found evidence of a mass–metallicity trend, we find no such relation within our data. For the hotter planets within our sample, we find evidence for thermal dissociation of dihydrogen and water via the H− opacity. We suggest that the general lack of trends seen across this population study could be due to (i) the insufficient spectral coverage offered by the Hubble Space Telescope’s WFC3 G141 band, (ii) the lack of a simple trend across the whole population, (iii) the essentially random nature of the target selection for this study, or (iv) a combination of all the above. We set out how we can learn from this vast data set going forward in an attempt to ensure comparative planetology can be undertaken in the future with facilities such as the JWST, Twinkle, and Ariel. We conclude that a wider simultaneous spectral coverage is required as well as a more structured approach to target selection
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