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Mitigating Worst-Case Exozodiacal Dust Structure in High-contrast Images of Earth-like Exoplanets
Miles H. Currie, Christopher C. Stark, Jens Kammerer +2
Detecting Earth-like exoplanets in direct images of nearby Sun-like systems brings a unique set of challenges that must be addressed in the early phases of designing a space-based…
A Non-Detection of Iron in the First High-Resolution Emission Study of the Lava Planet 55 Cnc e
Kaitlin C. Rasmussen, Miles H. Currie, Celeste Hagee +17
Close-in lava planets represent an extreme example of terrestrial worlds, but their high temperatures may allow us to probe a diversity of crustal compositions. The brightest and m…
Earth as a Transiting Exoplanet: A Validation of Transmission Spectroscopy and Atmospheric Retrieval Methodologies for Terrestrial Exoplanets
Jacob Lustig-Yaeger, Victoria S. Meadows, David Crisp +2
The James Webb Space Telescope (JWST) will enable the search for and characterization of terrestrial exoplanet atmospheres in the habitable zone via transmission spectroscopy. Howe…
Potential Atmospheric Compositions of TRAPPIST-1 c constrained by JWST/MIRI Observations at 15 m
Andrew P. Lincowski, Victoria S. Meadows, Sebastian Zieba +13
The first JWST observations of TRAPPIST-1 c showed a secondary eclipse depth of 421+/-94 ppm at 15 um, which is consistent with a bare rock surface or a thin, O2-dominated, low CO2…
No thick carbon dioxide atmosphere on the rocky exoplanet TRAPPIST-1 c
Sebastian Zieba, Laura Kreidberg, Elsa Ducrot +16
Seven rocky planets orbit the nearby dwarf star TRAPPIST-1, providing a unique opportunity to search for atmospheres on small planets outside the Solar System (Gillon et al., 2017)…
There's more to life than O: Simulating the detectability of a range of molecules for ground-based high-resolution spectroscopy of transiting terrestrial exoplanets
Miles H. Currie, Victoria S. Meadows, Kaitlin C. Rasmussen
Within the next decade, atmospheric O on Earth-like M dwarf planets may be accessible with visible--near-infrared, high spectral resolution extremely large ground-based telesco…
Survival and dynamics of rings of co-orbital planets under perturbations
Sean N. Raymond, Dimitri Veras, Matthew S. Clement +3
In co-orbital planetary systems, two or more planets share the same orbit around their star. Here we test the dynamical stability of co-orbital rings of planets perturbed by outsid…
Constellations of co-orbital planets: horseshoe dynamics, long-term stability, transit timing variations, and potential as SETI beacons
Sean N. Raymond, Dimitri Veras, Matthew S. Clement +3
Co-orbital systems contain two or more bodies sharing the same orbit around a planet or star. The best-known flavors of co-orbital systems are tadpoles (in which two bodies' angula…
Photosynthetic Fluorescence from Earth-Like Planets around Sun-Like and Cool Stars
Yu Komatsu, Yasunori Hori, Masayuki Kuzuhara +8
Remote sensing of the Earth has demonstrated that photosynthesis is traceable as the vegetation red edge (VRE), which is the steep rise in the reflection spectrum of vegetation, an…
Claimed detection of PH in the clouds of Venus is consistent with mesospheric SO
Andrew P. Lincowski, Victoria S. Meadows, David Crisp +7
The observation of a 266.94 GHz feature in the Venus spectrum has been attributed to PH in the Venus clouds, suggesting unexpected geological, chemical or even biological proce…
Complications in the ALMA Detection of Phosphine at Venus
Alex B. Akins, Andrew P. Lincowski, Victoria S. Meadows +1
Recently published ALMA observations suggest the presence of 20 ppb PH in the upper clouds of Venus. This is an unexpected result, as PH does not have a readily apparent so…
The Fundamental Connections Between the Solar System and Exoplanetary Science
Stephen R. Kane, Giada N. Arney, Paul K. Byrne +7
Over the past several decades, thousands of planets have been discovered outside of our Solar System. These planets exhibit enormous diversity, and their large numbers provide a st…
Spectropolarimetry of primitive phototrophs as global surface biosignatures
William B. Sparks, M. Niki Parenteau, Robert E. Blankenship +5
Photosynthesis is an ancient metabolic process that began on the early Earth, offering plentiful energy to organisms that utilize it, to the extent that they can achieve global sig…
Refining the transit timing and photometric analysis of TRAPPIST-1: Masses, radii, densities, dynamics, and ephemerides
Eric Agol, Caroline Dorn, Simon L. Grimm +32
We have collected transit times for the TRAPPIST-1 system with the Spitzer Space Telescope over four years. We add to these ground-based, HST and K2 transit time measurements, and…
High-Resolution Spectral Discriminants of Ocean Loss for M Dwarf Terrestrial Exoplanets
Michaela Leung, Victoria S. Meadows, Jacob Lustig-Yaeger
In the near future, extremely-large ground-based telescopes may conduct some of the first searches for life beyond the solar system. High-spectral resolution observations of reflec…
The Impact of Planetary Rotation Rate on the Reflectance and Thermal Emission Spectrum of Terrestrial Exoplanets Around Sun-like Stars
Scott D. Guzewich, Jacob Lustig-Yaeger, Christopher Evan Davis +3
Robust atmospheric and radiative transfer modeling will be required to properly interpret reflected light and thermal emission spectra of terrestrial exoplanets. This will help bre…
The TRAPPIST-1 JWST Community Initiative
Michaël Gillon, Victoria Meadows, Eric Agol +10
The upcoming launch of the James Webb Space Telescope (JWST) combined with the unique features of the TRAPPIST-1 planetary system should enable the young field of exoplanetology to…
A mirage of the cosmic shoreline: Venus-like clouds as a statistical false positive for exoplanet atmospheric erosion
Jacob Lustig-Yaeger, Victoria S. Meadows, Andrew P. Lincowski
Near-term studies of Venus-like atmospheres with JWST promise to advance our knowledge of terrestrial planet evolution. However, the remote study of Venus in the Solar System and t…
ESA Voyage 2050 White Paper: Detecting life outside our solar system with a large high-contrast-imaging mission
Ignas Snellen, Simon Albrecht, Guillem Anglada-Escude +64
In this white paper, we recommend the European Space Agency plays a proactive role in developing a global collaborative effort to construct a large high-contrast imaging space tele…
Observing Isotopologue Bands in Terrestrial Exoplanet Atmospheres with the James Webb Space Telescope---Implications for Identifying Past Atmospheric and Ocean Loss
Andrew P. Lincowski, Jacob Lustig-Yaeger, Victoria S. Meadows
Terrestrial planets orbiting M dwarfs may soon be observed with the James Webb Space Telescope (JWST) to characterize their atmospheric composition and search for signs of habitabi…
The Detectability and Characterization of the TRAPPIST-1 Exoplanet Atmospheres with JWST
Jacob Lustig-Yaeger, Victoria S. Meadows, Andrew P. Lincowski
The James Webb Space Telescope (JWST) will offer the first opportunity to characterize terrestrial exoplanets with sufficient precision to identify high mean molecular weight atmos…
VPLanet: The Virtual Planet Simulator
Rory Barnes, Rodrigo Luger, Russell Deitrick +14
We describe a software package called VPLanet that simulates fundamental aspects of planetary system evolution over Gyr timescales, with a focus on investigating habitable worlds.…
The remote detectability of Earth's biosphere through time and the importance of UV capability for characterizing habitable exoplanets
Christopher T. Reinhard, Edward W. Schwieterman, Stephanie L. Olson +10
Thousands of planets beyond our solar system have been discovered to date, dozens of which are rocky in composition and are orbiting within the circumstellar habitable zone of thei…
Detecting Ocean Glint on Exoplanets Using Multiphase Mapping
Jacob Lustig-Yaeger, Victoria S. Meadows, Guadalupe Tovar Mendoza +4
Rotational mapping and glint are two proposed methods to directly detect liquid water on the surface of habitable exoplanets. However, false positives for both methods may prevent…