Edward W. Schwieterman
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View article: What's Inside Matters: The Effect of Oxygen Fugacity and Initial Volatile Abundance on the Atmospheres of the TRAPPIST-1 Planets
What's Inside Matters: The Effect of Oxygen Fugacity and Initial Volatile Abundance on the Atmospheres of the TRAPPIST-1 Planets Open
The TRAPPIST-1 planets have become prime targets for studying the atmospheric and geophysical properties of planets around M-dwarf stars. To effectively identify their atmospheric composition, we first must understand their geological evol…
View article: JWST-TST DREAMS: The Nightside Emission and Chemistry of WASP-17b
JWST-TST DREAMS: The Nightside Emission and Chemistry of WASP-17b Open
Theoretical studies have suggested using planetary infrared excess (PIE) to detect and characterize the thermal emission of transiting and nontransiting exoplanets, although the PIE technique requires empirical validation. Here, we apply t…
View article: K2-18b Does Not Meet the Standards of Evidence for Life
K2-18b Does Not Meet the Standards of Evidence for Life Open
K2-18b, a temperate sub-Neptune, has garnered significant attention due to claims of possible biosignatures in its atmosphere. Low-confidence detections of dimethyl sulfide (DMS) and/or dimethyl disulfide (DMDS) have sparked considerable d…
View article: JWST-TST DREAMS: The Nightside Emission and Chemistry of WASP-17b
JWST-TST DREAMS: The Nightside Emission and Chemistry of WASP-17b Open
Theoretical studies have suggested using planetary infrared excess (PIE) to detect and characterize the thermal emission of transiting and non-transiting exoplanets, however the PIE technique requires empirical validation. Here we apply th…
View article: Chemistry, Climate, and Transmission Spectra of TRAPPIST-1 e Explored with a Multimodel Sparse Sampled Ensemble
Chemistry, Climate, and Transmission Spectra of TRAPPIST-1 e Explored with a Multimodel Sparse Sampled Ensemble Open
TRAPPIST-1 e is one of a few habitable zone exoplanets that is amenable to characterization in the near term. In this study our motivations are both scientific and technical. Our technical goal is to establish a multimodel sparse sampled e…
View article: Biosignature False Positives in Potentially Habitable Planets around M Dwarfs: The Effect of UV Radiation from One Flare
Biosignature False Positives in Potentially Habitable Planets around M Dwarfs: The Effect of UV Radiation from One Flare Open
Many past studies have predicted the steady-state production and maintenance of abiotic O 2 and O 3 in the atmospheres of CO 2 -rich terrestrial planets orbiting M dwarf stars. However, the time-dependent responses of these planetary atmos…
View article: Assessing the Impact of Varying HSO and HNO Cross-Sections on Photochemical Models: Implications for Spectral Characterization of Terrestrial Exoplanets
Assessing the Impact of Varying HSO and HNO Cross-Sections on Photochemical Models: Implications for Spectral Characterization of Terrestrial Exoplanets Open
The advent of the James Webb Space Telescope (JWST) is enabling initial forays into the characterization of rocky exoplanet atmospheres. By the end of this decade, the European Extremely Large Telescope (E-ELT) and ESA’s ARIEL space missio…
View article: Erratum: “Alternative Methylated Biosignatures. I. Methyl Bromide, a Capstone Biosignature” (2022, ApJ, 938, 6)
Erratum: “Alternative Methylated Biosignatures. I. Methyl Bromide, a Capstone Biosignature” (2022, ApJ, 938, 6) Open
View article: Modern Earth-like Chemical Disequilibrium Biosignatures are Challenging to Constrain through Spectroscopic Retrievals
Modern Earth-like Chemical Disequilibrium Biosignatures are Challenging to Constrain through Spectroscopic Retrievals Open
Robust exoplanet characterization studies are underway, and the community is looking ahead toward developing observational strategies to search for life beyond our solar system. With the development of life detection approaches like search…
View article: Giant Outer Transiting Exoplanet Mass (GOT ‘EM) Survey. V. Two Giant Planets in Kepler-511 but Only One Ran Away
Giant Outer Transiting Exoplanet Mass (GOT ‘EM) Survey. V. Two Giant Planets in Kepler-511 but Only One Ran Away Open
Systems hosting multiple giant planets are important laboratories for understanding planetary formation and migration processes. We present a nearly decade-long Doppler spectroscopy campaign from the HIRES instrument on the Keck-I telescop…
View article: Examining the Potential for Methyl Halide Accumulation and Detectability in Possible Hycean-type Atmospheres
Examining the Potential for Methyl Halide Accumulation and Detectability in Possible Hycean-type Atmospheres Open
Some sub-Neptune planets may host habitable conditions; for example “Hycean” worlds with H 2 envelopes over liquid water oceans can maintain potentially hospitable pressures and temperatures at their surface. Recent JWST observations of K2…
View article: Examining the Potential for Methyl Halide Accumulation and Detectability in Possible Hycean-Type Atmospheres
Examining the Potential for Methyl Halide Accumulation and Detectability in Possible Hycean-Type Atmospheres Open
Some sub-Neptune planets may host habitable conditions; for example "Hycean" worlds with H2 envelopes over liquid water oceans can maintain potentially hospitable pressures and temperatures at their surface. Recent JWST observations of K2-…
View article: The Impact of Extended CO<sub>2</sub> Cross Sections on Temperate Anoxic Planet Atmospheres
The Impact of Extended CO<sub>2</sub> Cross Sections on Temperate Anoxic Planet Atmospheres Open
Our interpretation of terrestrial exoplanet atmospheric spectra will always be limited by the accuracy of the data we use as input in our forward and retrieval models. Ultraviolet molecular absorption cross sections are one category of the…
View article: The Impact of Extended CO$_2$ Cross Sections on Temperate Anoxic Planet Atmospheres
The Impact of Extended CO$_2$ Cross Sections on Temperate Anoxic Planet Atmospheres Open
Our interpretation of terrestrial exoplanet atmospheric spectra will always be limited by the accuracy of the data we use as input in our forward and retrieval models. Ultraviolet molecular absorption cross sections are one category of the…
View article: History and Habitability of the LP 890-9 Planetary System
History and Habitability of the LP 890-9 Planetary System Open
We present numerous aspects of the evolution of the LP 890-9 (SPECULOOS-2/TOI-4306) planetary system, focusing on the likelihood that planet c can support life. We find that the host star reaches the main sequence in 1 Gyr and that planet …
View article: History and Habitability of the LP 890-9 Planetary System
History and Habitability of the LP 890-9 Planetary System Open
We present numerous aspects of the evolution of the LP 890-9 (SPECULOOS-2/TOI-4306) planetary system, focusing on the likelihood that planet c can support life. We find that the host star reaches the main sequence in 1 Gyr and that planet …
View article: X-Ray Emission of Nearby Low-mass and Sunlike Stars with Directly Imageable Habitable Zones
X-Ray Emission of Nearby Low-mass and Sunlike Stars with Directly Imageable Habitable Zones Open
Stellar X-ray and UV radiation can significantly affect the survival, composition, and long-term evolution of the atmospheres of planets in or near their host star’s habitable zone (HZ). Especially interesting are planetary systems in the …
View article: The TESS-Keck Survey. XXII. A Sub-Neptune Orbiting TOI-1437
The TESS-Keck Survey. XXII. A Sub-Neptune Orbiting TOI-1437 Open
Exoplanet discoveries have revealed a dramatic diversity of planet sizes across a vast array of orbital architectures. Sub-Neptunes are of particular interest; due to their absence in our own solar system, we rely on demographics of exopla…
View article: X-ray Emission of Nearby Low-mass and Sun-like Stars with Directly Imageable Habitable Zones
X-ray Emission of Nearby Low-mass and Sun-like Stars with Directly Imageable Habitable Zones Open
Stellar X-ray and UV radiation can significantly affect the survival, composition, and long-term evolution of the atmospheres of planets in or near their host star's habitable zone (HZ). Especially interesting are planetary systems in the …
View article: A roadmap for the atmospheric characterization of terrestrial exoplanets with JWST
A roadmap for the atmospheric characterization of terrestrial exoplanets with JWST Open
Ultracool dwarf stars are abundant, long-lived and uniquely suited to enable the atmospheric study of transiting terrestrial companions with the JWST. Among them, the most prominent is the M8.5V star TRAPPIST-1 and its seven planets. While…
View article: Artificial Greenhouse Gases as Exoplanet Technosignatures
Artificial Greenhouse Gases as Exoplanet Technosignatures Open
Atmospheric pollutants such as chlorofluorocarbons and NO 2 have been proposed as potential remotely detectable atmospheric technosignature gases. Here we investigate the potential for artificial greenhouse gases including CF 4 , C 2 F 6 ,…
View article: The Impact of Extended H<sub>2</sub>O Cross Sections on Temperate Anoxic Planet Atmospheres: Implications for Spectral Characterization of Habitable Worlds
The Impact of Extended H<sub>2</sub>O Cross Sections on Temperate Anoxic Planet Atmospheres: Implications for Spectral Characterization of Habitable Worlds Open
JWST has created a new era of terrestrial exoplanet atmospheric characterization, and with it, the possibility to detect potential biosignature gases like CH 4 . Our interpretation of exoplanet atmospheric spectra, and the veracity of thes…
View article: The TESS-Keck Survey. XXII. A sub-Neptune Orbiting TOI-1437
The TESS-Keck Survey. XXII. A sub-Neptune Orbiting TOI-1437 Open
Exoplanet discoveries have revealed a dramatic diversity of planet sizes across a vast array of orbital architectures. Sub-Neptunes are of particular interest; due to their absence in our own solar system, we rely on demographics of exopla…
View article: Giant Outer Transiting Exoplanet Mass (GOT `EM) Survey. V. Two Giant Planets in Kepler-511 but Only One Ran Away
Giant Outer Transiting Exoplanet Mass (GOT `EM) Survey. V. Two Giant Planets in Kepler-511 but Only One Ran Away Open
Systems hosting multiple giant planets are important laboratories for understanding planetary formation and migration processes. We present a nearly decade-long Doppler spectroscopy campaign from the HIRES instrument on the Keck-I telescop…
View article: Biogenic Sulfur Gases as Biosignatures on Temperate Sub-Neptune Waterworlds
Biogenic Sulfur Gases as Biosignatures on Temperate Sub-Neptune Waterworlds Open
Theoretical predictions and observational data indicate a class of sub-Neptune exoplanets may have water-rich interiors covered by hydrogen-dominated atmospheres. Provided suitable climate conditions, such planets could host surface liquid…
View article: An Overview of Exoplanet Biosignatures
An Overview of Exoplanet Biosignatures Open
This chapter reviews proposed exoplanet biosignatures, including their biological origins, observable features, atmospheric sinks, and potentially confounding abiotic sources. Emphasis is placed on material published since past comprehensi…
View article: The Impact of Extended H$_{2}$O Cross-Sections on Temperate Anoxic Planet Atmospheres: Implications for Spectral Characterization of Habitable Worlds
The Impact of Extended H$_{2}$O Cross-Sections on Temperate Anoxic Planet Atmospheres: Implications for Spectral Characterization of Habitable Worlds Open
JWST has created a new era of terrestrial exoplanet atmospheric characterization, and with it the possibility to detect potential biosignature gases like CH$_{4}$. Our interpretation of exoplanet atmospheric spectra, and the veracity of th…
View article: Large Interferometer For Exoplanets (LIFE). XII. The Detectability of Capstone Biosignatures in the Mid-infrared-Sniffing Exoplanetary Laughing Gas and Methylated Halogens
Large Interferometer For Exoplanets (LIFE). XII. The Detectability of Capstone Biosignatures in the Mid-infrared-Sniffing Exoplanetary Laughing Gas and Methylated Halogens Open
This study aims to identify exemplary science cases for observing N$_2$O, CH$_3$Cl, and CH$_3$Br in exoplanet atmospheres at abundances consistent with biogenic production using a space-based mid-infrared nulling interferometric observator…
View article: Modeling Atmospheric Lines by the Exoplanet Community (MALBEC) Version 1.0: A CUISINES Radiative Transfer Intercomparison Project
Modeling Atmospheric Lines by the Exoplanet Community (MALBEC) Version 1.0: A CUISINES Radiative Transfer Intercomparison Project Open
Radiative transfer (RT) models are critical in the interpretation of exoplanetary spectra, in simulating exoplanet climates, and when designing the specifications of future flagship observatories. However, most models differ in methodologi…
View article: Global Chemical Transport on Hot Jupiters: Insights from the 2D VULCAN Photochemical Model
Global Chemical Transport on Hot Jupiters: Insights from the 2D VULCAN Photochemical Model Open
The atmospheric dynamics of tidally locked hot Jupiters is characterized by strong equatorial winds. Understanding the interaction between global circulation and chemistry is crucial in atmospheric studies and interpreting observations. Tw…