593 citations · 2k across the 34 of their papers we have counts for
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JWST MIRI reveals a potential atmosphere on the ultra-hot rocky planet TOI-431b
Cole Smith, Brandon Park Coy, Megan Weiner Mansfield +13
An open question in exoplanet science is whether rocky exoplanets extremely close in to their host stars, `lava worlds', can retain significant atmospheres. Thermal emission observ…
Magnetic field strengths of hot giant exoplanets consistent with Solar System values
Julia V. Seidel, Vivien Parmentier, Bibiana Prinoth +29
Magnetic fields are ubiquitous in the universe. They play a key role in shaping the activity of stars, the habitability of rocky planets, and the long-term retention of planetary a…
Reinterpreting the JWST Observations of 55 Cancri e with a Non-Grey General Circulation Model
Ruizhi Zhan, Daniel D. B. Koll
Recent observations of 55 Cancri e suggest an atmosphere rich in CO or CO (Hu et al. 2024); other observations indicate the planet's eclipse depth is highly variable (e.g. Pate…
The dark and featureless surface of rocky exoplanet LHS 3844 b from JWST mid-infrared spectroscopy
Sebastian Zieba, Laura Kreidberg, Brandon P. Coy +13
JWST has opened a new era in the study of rocky exoplanets, enabling direct characterization of their surfaces with mid-infrared spectroscopy. Different types of rock have distinct…
Evidence for an Atmosphere on the Ultra-Short Period super-Earth HD 3167 b
Brandon Park Coy, Qiao Xue, Megan Weiner Mansfield +14
'Lava worlds'-Earth-sized planets hot enough (Teq >~ 1100 K) to melt their dayside silicate surfaces-have emerged as promising candidates for atmospheric detection and characteriza…
Bistability, Oscillations, and Multistability on Hycean Planets
Yichen Gao, Daniel D. B. Koll, Feng Ding
Hycean planets are hypothetical exoplanets characterized by oceans and -rich atmospheres. These planets are high-priority targets for biosignature searches, as they com…
Impact of Subsurface Temperature Gradients on Emission Spectra of Airless Exoplanets: the Solid-state Greenhouse and Anti-Greenhouse
Xintong Lyu, Daniel D. B. Koll
An emerging goal of exoplanet science is to constrain the surface composition of airless exoplanets. Without the protection of an atmosphere, these planets are likely covered by a…
First JWST thermal phase curves of temperate terrestrial exoplanets reveal no thick atmosphere around TRAPPIST-1 b and c
Michaël Gillon, Elsa Ducrot, Taylor J. Bell +30
We report JWST/MIRI 15 m phase curves of TRAPPIST-1 b and c, revealing thermal emission consistent with their irradiation levels, assuming no efficient heat redistribution. We f…
Population-level Hypothesis Testing with Rocky Planet Emission Data: A Tentative Trend in the Brightness Temperatures of M-Earths
Brandon Park Coy, Jegug Ih, Edwin S. Kite +11
Determining which rocky exoplanets have atmospheres, and why, is a key goal for the James Webb Space Telescope. So far, emission observations of individual rocky exoplanets orbitin…
JWST Thermal Emission of the Terrestrial Exoplanet GJ 1132b
Qiao Xue, Jacob L. Bean, Michael Zhang +9
We present thermal emission measurements of GJ 1132b spanning 5--12 um obtained with the Mid-Infrared Instrument Low-Resolution Spectrometer (MIRI/LRS) on the James Webb Space Tele…
No Thick Atmosphere on the Terrestrial Exoplanet Gl 486b
Megan Weiner Mansfield, Qiao Xue, Michael Zhang +8
A primary science goal for JWST is to detect and characterize the atmospheres of terrestrial planets orbiting M dwarfs (M-Earths). The existence of atmospheres on M-Earths is highl…
Novel Atmospheric Dynamics Shape Inner Edge of Habitable Zone Around White Dwarfs
Ruizhi Zhan, Daniel D. B. Koll, Feng Ding
White dwarfs offer a unique opportunity to search nearby stellar systems for signs of life, but the habitable zone around these stars is still poorly understood. Since white dwarfs…
Detection of an Earth-sized exoplanet orbiting the nearby ultracool dwarf star SPECULOOS-3
Michaël Gillon, Peter P. Pedersen, Benjamin V. Rackham +81
Located at the bottom of the main sequence, ultracool dwarf stars are widespread in the solar neighbourhood. Nevertheless, their extremely low luminosity has left their planetary p…
A roadmap for the atmospheric characterization of terrestrial exoplanets with JWST
TRAPPIST-1 JWST Community Initiative, :, Julien de Wit +80
Ultra-cool dwarf stars are abundant, long-lived, and uniquely suited to enable the atmospheric study of transiting terrestrial companions with JWST. Amongst them, the most prominen…
Super-Earth LHS3844b is tidally locked
Xintong Lyu, Daniel D. B. Koll, Nicolas B. Cowan +3
Short period exoplanets on circular orbits are thought to be tidally locked into synchronous rotation. If tidally locked, these planets must possess permanent day- and nightsides,…
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)…
The transmission spectrum of the potentially rocky planet L 98-59 c
Thomas Barclay, Kyle B. Sheppard, Natasha Latouf +32
We present observations of the 1.35+/-0.07 Earth-radius planet L 98-59 c, collected using Wide Field Camera 3 on the Hubble Space Telescope. L 98-59 is a nearby (10.6 pc), bright (…
The Detectability of Rocky Planet Surface and Atmosphere Composition with JWST: The Case of LHS 3844b
Emily A. Whittaker, Matej Malik, Jegug Ih +7
The spectroscopic characterization of terrestrial exoplanets will be made possible for the first time with JWST. One challenge to characterizing such planets is that it is not know…
Photochemical Runaway in Exoplanet Atmospheres: Implications for Biosignatures
Sukrit Ranjan, Sara Seager, Zhuchang Zhan +5
About 2.5 billion years ago, microbes learned to harness plentiful solar energy to reduce CO with HO, extracting energy and producing O as waste. O production from…
Simulations of Water Vapor and Clouds on Rapidly Rotating and Tidally Locked Planets: a 3D Model Intercomparison
Jun Yang, Jeremy Leconte, Eric T. Wolf +4
Robustly modeling the inner edge of the habitable zone is essential for determining the most promising potentially habitable exoplanets for atmospheric characterization. Global cli…
TESS observations of the WASP-121 b phase curve
Tansu Daylan, Maximilian N. Günther, Thomas Mikal-Evans +23
We study the red-optical photometry of the ultra-hot Jupiter WASP-121 b as observed by the Transiting Exoplanet Survey Satellite (TESS) and model its atmosphere through a radiative…
Absence of a thick atmosphere on the terrestrial exoplanet LHS 3844b
Laura Kreidberg, Daniel D. B. Koll, Caroline Morley +16
Most known terrestrial planets orbit small stars with radii less than 60% that of the Sun. Theoretical models predict that these planets are more vulnerable to atmospheric loss tha…
Hot Hydrogen Climates near the inner edge of the Habitable Zone
Daniel D. B. Koll, Timothy W. Cronin
Young terrestrial planets can capture or outgas hydrogen-rich atmospheres with tens to hundreds of bars of H2, which persist for 100 Myrs or longer. Although the earliest habitable…