406 citations · 3.3k across the 80 of their papers we have counts for
31 papers · 1 filter
ESCAPE: a small explorer mission to study the stellar drivers of exoplanet evolution
Allison Youngblood, Kevin France, Brian Fleming +37
The long-term stability of exoplanetary atmospheres depends critically on the extreme-ultraviolet (EUV) photon and high-energy particle fluxes from the host star, which are poorly…
Atmospheric Escape From Three Terrestrial Planets in the L 98-59 System
Emeline F. Fromont, John P. Ahlers, Laura N. R. do Amaral +6
A critically important process affecting the climate evolution and potential habitability of an exoplanet is atmospheric escape, in which high-energy radiation from a star drives t…
The Variable Detection of Atmospheric Escape around the young, Hot Neptune AU Mic b
Keighley E. Rockcliffe, Elisabeth R. Newton, Allison Youngblood +5
Photoevaporation is a potential explanation for several features within exoplanet demographics. Atmospheric escape observed in young Neptune-sized exoplanets can provide insight in…
Three long period transiting giant planets from TESS
Rafael Brahm, Solène Ulmer-Moll, Melissa J. Hobson +52
We report the discovery and orbital characterization of three new transiting warm giant planets. These systems were initially identified as presenting single transit events in the…
A High-Eccentricity Warm Jupiter Orbiting TOI-4127
Arvind F. Gupta, Jonathan M. Jackson, Guillaume Hebrard +36
We report the discovery of TOI-4127 b, a transiting, Jupiter-sized exoplanet on a long-period ( d), high-eccentricity orbit around a late F-type…
A Second Earth-Sized Planet in the Habitable Zone of the M Dwarf, TOI-700
Emily A. Gilbert, Andrew Vanderburg, Joseph E. Rodriguez +29
We report the discovery of TOI-700 e, a 0.95 R planet residing in the Optimistic Habitable Zone (HZ) of its host star. This discovery was enabled by multiple years of moni…
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 (…
Detection Feasibility of H in Ultra-hot Jupiter Atmospheres
Anastasia Morgan, P. Wilson Cauley, Kevin France +2
Ultra-hot Jupiters (UHJs) have recently been the focus of several atmospheric studies due to their extreme properties. While molecular hydrogen (H) plays a key role in UHJ atmo…
The K2-3 system revisited: testing photoevaporation and core-powered mass loss with three small planets spanning the radius valley
Hannah Diamond-Lowe, Laura Kreidberg, C. E. Harman +11
Multi-planet systems orbiting M dwarfs provide valuable tests of theories of small planet formation and evolution. K2-3 is an early M dwarf hosting three small exoplanets (1.5-2.0…
A detailed analysis of the Gl 486 planetary system
J. A. Caballero, E. Gonzalez-Alvarez, M. Brady +64
The Gl 486 system consists of a very nearby, relatively bright, weakly active M3.5 V star at just 8 pc with a warm transiting rocky planet of about 1.3 R_Terra and 3.0 M_Terra that…
Effects of UV stellar spectral uncertainty on the chemistry of terrestrial atmospheres
D. J. Teal, Eliza M. -R. Kempton, Sandra Bastelberger +2
The upcoming deployment of JWST will dramatically advance our ability to characterize exoplanet atmospheres, both in terms of precision and sensitivity to smaller and cooler planet…
A Lyman-alpha transit left undetected: the environment and atmospheric behavior of K2-25b
Keighley E. Rockcliffe, Elisabeth R. Newton, Allison Youngblood +6
K2-25b is a Neptune-sized exoplanet (3.45 Earth radii) that orbits its M4.5 host with a period of 3.48 days. Due to its membership in the Hyades Cluster, the system has a known age…
A Radiatively Driven Wind from the eta Tel Debris Disk
Allison Youngblood, Aki Roberge, Meredith A. MacGregor +5
We present far- and near-ultraviolet absorption spectroscopy of the 23 Myr edge-on debris disk surrounding the A0V star Telescopii, obtained with the Hubble Space Telesco…
TOI-1231 b: A Temperate, Neptune-Sized Planet Transiting the Nearby M3 Dwarf NLTT 24399
Jennifer A. Burt, Diana Dragomir, Paul Mollière +59
We report the discovery of a transiting, temperate, Neptune-sized exoplanet orbiting the nearby ( = 27.5 pc), M3V star TOI-1231 (NLTT 24399, L 248-27, 2MASS J10265947-5228099).…
A Heavy Molecular Weight Atmosphere for the Super-Earth π Men c
A. García Muñoz, L. Fossati, A. Youngblood +4
Strongly irradiated exoplanets develop extended atmospheres that can be utilized to probe the deeper planet layers. This connection is particularly useful in the study of small exo…
A multi-wavelength look at the GJ 9827 system -- No evidence of extended atmospheres in GJ 9827 b and d from HST and CARMENES data
Ilaria Carleo, Allison Youngblood, Seth Redfield +18
GJ9827 is a bright star hosting a planetary system with three transiting planets. As a multi-planet system with planets that sprawl within the boundaries of the radius gap between…
Persistence of Flare-Driven Atmospheric Chemistry on Rocky Habitable Zone Worlds
Howard Chen, Zhuchang Zhan, Allison Youngblood +3
Low-mass stars show evidence of vigorous magnetic activity in the form of large flares and coronal mass ejections. Such space weather events may have important ramifications for th…
GJ 436b and the stellar wind interaction: simulations constraints using Ly and H transits
C. Villarreal D'Angelo, A. A. Vidotto, A. Esquivel +2
The GJ 436 planetary system is an extraordinary system. The Neptune-size planet that orbits the M3 dwarf revealed in the Ly line an extended neutral hydrogen atmosphere. This ma…
The High-Energy Radiation Environment Around a 10 Gyr M Dwarf: Habitable at Last?
Kevin France, Girish Duvvuri, Hilary Egan +20
High levels of X-ray and UV activity on young M dwarfs may drive rapid atmospheric escape on temperate, terrestrial planets orbiting within the liquid water habitable zone. However…
The Hubble Space Telescope's near-UV and optical transmission spectrum of Earth as an exoplanet
Allison Youngblood, Giada N. Arney, Antonio García Muñoz +3
We observed the 2019 January total lunar eclipse with the Hubble Space Telescope's STIS spectrograph to obtain the first near-UV (1700-3200 ) observation of Earth as a transitin…
A planet within the debris disk around the pre-main-sequence star AU Microscopii
Peter Plavchan, Thomas Barclay, Jonathan Gagné +84
AU Microscopii (AU Mic) is the second closest pre main sequence star, at a distance of 9.79 parsecs and with an age of 22 million years. AU Mic possesses a relatively rare and spat…
Three-dimensional hydrodynamic simulations of the upper atmosphere of Men c: comparison with Ly transit observations
I. F. Shaikhislamov, L. Fossati, M. L. Khodachenko +5
Aims: We aim at constraining the conditions of the wind and high-energy emission of the host star reproducing the non-detection of Ly planetary absorption. Methods: We model the…
The First Habitable Zone Earth-sized Planet from TESS. I: Validation of the TOI-700 System
Emily A. Gilbert, Thomas Barclay, Joshua E. Schlieder +92
We present the discovery and validation of a three-planet system orbiting the nearby (31.1 pc) M2 dwarf star TOI-700 (TIC 150428135). TOI-700 lies in the TESS continuous viewing zo…
Detecting volcanically produced tori along orbits of exoplanets using UV spectroscopy
Kristina G. Kislyakova, Luca Fossati, Denis Shulyak +17
We suggest to use the Hubble Space Telescople (HST) follow-up observations of the TESS targets for detecting possible plasma tori along the orbits of exoplanets orbiting M dwarfs.…