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Hubble PanCET: An extended upper atmosphere of neutral hydrogen around the warm Neptune GJ 3470 b
V. Bourrier, A. Lecavelier des Etangs, D. Ehrenreich +16
GJ 3470b is a warm Neptune transiting an M-dwarf star at the edge of the evaporation desert. It offers the possibility of investigating how low-mass, close-in exoplanets evolve und…
Disentangling the planet from the star in late type M dwarfs: A case study of TRAPPIST-1g
Hannah R. Wakeford, Nikole K. Lewis, Julia Fowler +10
The atmospheres of late M stars represent a significant challenge in the characterization of any transiting exoplanets due to the presence of strong molecular features in the stell…
The HST PanCET Program: Hints of Na I & Evidence of a Cloudy Atmosphere for the Inflated Hot Jupiter WASP-52b
Munazza K. Alam, Nikolay Nikolov, Mercedes Lopez-Morales +16
We present an optical to near-infrared transmission spectrum of the inflated hot Jupiter WASP-52b using three transit observations from the Space Telescope Imaging Spectrograph (ST…
Fully scalable forward model grid of exoplanet transmission spectra
Jayesh M. Goyal, Hannah R. Wakeford, Nathan J. Mayne +3
Simulated exoplanet transmission spectra are critical for planning and interpretation of observations and to explore the sensitivity of spectral features to atmospheric thermochemi…
An optical transmission spectrum for the ultra-hot Jupiter WASP-121b measured with the Hubble Space Telescope
Thomas M. Evans, David K. Sing, Jayesh Goyal +24
We present an atmospheric transmission spectrum for the ultra-hot Jupiter WASP-121b, measured using the Space Telescope Imaging Spectrograph (STIS) onboard the Hubble Space Telesco…
Limits on Clouds and Hazes for the TRAPPIST-1 Planets
Sarah E. Moran, Sarah M. Hörst, Natasha E. Batalha +2
The TRAPPIST-1 planetary system is an excellent candidate for study of the evolution and habitability of M-dwarf planets. Transmission spectroscopy observations performed with the…
Starspot occultations in infrared transit spectroscopy: the case of WASP-52b
Giovanni Bruno, Nikole K. Lewis, Kevin B. Stevenson +7
Stellar activity is one of the main obstacles to high-precision exoplanet observations and has motivated extensive studies in detection and characterization problems. Most efforts…
An absolute sodium abundance for a cloud-free 'hot Saturn' exoplanet
Nikolay Nikolov, David K. Sing, Jonathan J. Fortney +20
Broad absorption signatures from alkali metals, such as the sodium (Na I) and potassium (K I) resonance doublets, have long been predicted in the optical atmospheric spectra of clo…
Helium in the eroding atmosphere of an exoplanet
J. J. Spake, D. K. Sing, T. M. Evans +20
Helium is the second-most abundant element in the Universe after hydrogen and is one of the main constituents of gas-giant planets in our Solar System. Early theoretical models pre…
The Transiting Exoplanet Community Early Release Science Program for JWST
Jacob L. Bean, Kevin B. Stevenson, Natalie M. Batalha +99
The James Webb Space Telescope (JWST) presents the opportunity to transform our understanding of planets and the origins of life by revealing the atmospheric compositions, structur…
Atmospheric reconnaissance of the habitable-zone Earth-sized planets orbiting TRAPPIST-1
J. de Wit, H. R. Wakeford, N. Lewis +14
Seven temperate Earth-sized exoplanets readily amenable for atmospheric studies transit the nearby ultracool dwarf star TRAPPIST-1 (refs 1,2). Their atmospheric regime is unknown a…