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Detection of Helium in the Atmosphere of the Exo-Neptune HAT-P-11b
Megan Mansfield, Jacob L. Bean, Antonija Oklopčić +11
The helium absorption triplet at a wavelength of 10,833 Å has been proposed as a way to probe the escaping atmospheres of exoplanets. Recently this feature was detected for the fir…
Global Climate and Atmospheric Composition of the Ultra-Hot Jupiter WASP-103b from HST and Spitzer Phase Curve Observations
Laura Kreidberg, Michael R. Line, Vivien Parmentier +12
We present thermal phase curve measurements for the hot Jupiter WASP-103b observed with Hubble/WFC3 and Spitzer/IRAC. The phase curves have large amplitudes and negligible hotspot…
Non-Detection of a Helium Exosphere for the Hot Jupiter WASP-12b
Laura Kreidberg, Antonija Oklopčić
An exosphere was recently detected around the exoplanet WASP-107b, a low-density, warm Neptune, based on an absorption feature from metastable helium (which has a vacuum wavelength…
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…
A Framework for Prioritizing the TESS Planetary Candidates Most Amenable to Atmospheric Characterization
Eliza M. -R. Kempton, Jacob L. Bean, Dana R. Louie +40
A key legacy of the recently launched TESS mission will be to provide the astronomical community with many of the best transiting exoplanet targets for atmospheric characterization…
A HST/WFC3 Thermal Emission Spectrum of the Hot Jupiter HAT-P-7b
Megan Mansfield, Jacob L. Bean, Michael R. Line +7
Secondary eclipse observations of several of the hottest hot Jupiters show featureless, blackbody-like spectra or molecular emission features, which are consistent with thermal inv…
From thermal dissociation to condensation in the atmospheres of ultra hot Jupiters: WASP-121b in context
Vivien Parmentier, Mike R. Line, Jacob L. Bean +10
A new class of exoplanets has emerged: the ultra hot Jupiters, the hottest close-in gas giants. Most of them have weaker than expected spectral features in the bandpass…
Understanding Stellar Contamination in Exoplanet Transmission Spectra as an Essential Step in Small Planet Characterization
Dániel Apai, Benjamin V. Rackham, Mark S. Giampapa +18
Transmission spectroscopy during planetary transits is expected to be a major source of information on the atmospheres of small (approximately Earth-sized) exoplanets in the next t…
Additional Exoplanet Science Enabled by FINESSE
Robert T. Zellem, Jonathan J. Fortney, Mark R. Swain +10
FINESSE, a NASA MIDEX mission in Step 2, would conduct a large, uniform survey of exoplanet atmospheres and create a statistically significant sample for comparative planetology. F…
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…
Two warm, low-density sub-Jovian planets orbiting bright stars in K2 campaigns 13 and 14
Liang Yu, Joseph E. Rodriguez, Jason D. Eastman +25
We report the discovery of two planets transiting the bright stars HD 89345 (EPIC 248777106, , ) in K2 Campaign 14 and HD 286123 (EPIC 247098361, , $K=8.…
An ultra-short period rocky super-Earth with a secondary eclipse and a Neptune-like companion around K2-141
Luca Malavolta, Andrew W. Mayo, Tom Louden +44
Ultra-short period (USP) planets are a class of low mass planets with periods shorter than one day. Their origin is still unknown, with photo-evaporation of mini-Neptunes and in-si…
H- Opacity and Water Dissociation in the Dayside Atmosphere of the Very Hot Gas Giant WASP-18 b
Jacob Arcangeli, Jean-Michel Desert, Michael R. Line +7
We present one of the most precise emission spectra of an exoplanet observed so far. We combine five secondary eclipses of the hot Jupiter WASP-18 b (Tday=2900K) that we secured be…