406 citations · 3.3k across the 80 of their papers we have counts for
12 papers · 1 filter
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…
Ca II H&K stellar activity parameter: a proxy for stellar Extreme Ultraviolet Fluxes
A. G. Sreejith, L. Fossati, A. Youngblood +2
Atmospheric escape is an important factor shaping the exoplanet population and hence drives our understanding of planet formation. Atmospheric escape from giant planets is driven p…
A High-Cadence UV-Optical Telescope Suite On The Lunar South Pole
Scott W. Fleming, Thomas Barclay, Keaton J. Bell +14
We propose a suite of telescopes be deployed as part of the Artemis III human-crewed expedition to the lunar south pole, able to collect wide-field simultaneous far-ultraviolet (UV…
Estimating the Ultraviolet Emission of M dwarfs with Exoplanets from Ca II and H
Katherine Melbourne, Allison Youngblood, Kevin France +29
M dwarf stars are excellent candidates around which to search for exoplanets, including temperate, Earth-sized planets. To evaluate the photochemistry of the planetary atmosphere,…
Solar Analogs as a Tool to Understand the Sun
Allison Youngblood, Steve Cranmer, Sam Van Kooten +6
Solar analogs, broadly defined as stars similar to the Sun in mass or spectral type, provide a useful laboratory for exploring the range of Sun-like behaviors and exploring the phy…
The relative emission from chromospheres and coronae: dependence on spectral type and age
Jeffrey L. Linsky, Brian E. Wood, Allison Youngblood +12
Extreme-ultraviolet and X-ray emissions from stellar coronae drive mass loss from exoplanet atmospheres, and ultraviolet emission from stellar chromospheres drives photo-chemistry…
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…
CHESS: an Innovative Concept for High-Resolution, Far-UV Spectroscopy
Keri Hoadley, Kevin France, Nicholas Nell +4
The space ultraviolet (UV) is a critical astronomical observing window, where a multitude of atomic, ionic, and molecular signatures provide crucial insight into planetary, interst…
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…