406 citations · 3.3k across the 80 of their papers we have counts for
16 papers · 1 filter
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…
Brown dwarfs as ideal candidates for detecting UV aurora outside the Solar System: Hubble Space Telescope observations of 2MASS J1237+6526
Joachim Saur, Clarissa Willmes, Christian Fischer +5
Context: Observations of auroral emissions are powerful means to remotely sense the space plasma environment around planetary bodies and ultracool dwarfs. Therefore successful sear…
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…
The Pandora SmallSat: Multiwavelength Characterization of Exoplanets and their Host Stars
Elisa V. Quintana, Knicole D. Colón, Gregory Mosby +24
Pandora is a SmallSat mission designed to study the atmospheres of exoplanets, and was selected as part of NASA's Astrophysics Pioneers Program. Transmission spectroscopy of transi…
Simultaneous Multiwavelength Flare Observations of EV Lacertae
Rishi R. Paudel, Thomas Barclay, Joshua E. Schlieder +17
We present the first results of our ongoing project conducting simultaneous multiwavelength observations of flares on nearby active M dwarfs. We acquired data of the nearby dM3.5e…
The M-dwarf Ultraviolet Spectroscopic Sample I. Determining Stellar Parameters for Field Stars
J. Sebastian Pineda, Allison Youngblood, Kevin France
Accurate stellar properties are essential for precise stellar astrophysics and exoplanetary science. In the M-dwarf regime, much effort has gone into defining empirical relations t…
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).…
Discovery of an Extremely Short Duration Flare from Proxima Centauri Using Millimeter through FUV Observations
Meredith A. MacGregor, Alycia J. Weinberger, R. O. Parke Loyd +17
We present the discovery of an extreme flaring event from Proxima Cen by ASKAP, ALMA, HST, TESS, and the du Pont Telescope that occurred on 2019 May 1. In the millimeter and FUV, t…
The high-energy spectrum of the nearby planet-hosting inactive mid-M dwarf LHS 3844
Hannah Diamond-Lowe, Allison Youngblood, David Charbonneau +5
To fully characterize the atmospheres, or lack thereof, of terrestrial exoplanets we must include the high-energy environments provided by their host stars. The nearby mid-M dwarf…
FUMES. II. Ly Reconstructions of Young, Active M Dwarfs
Allison Youngblood, J. Sebastian Pineda, Kevin France
The HI Ly (1215.67 $\unicode{xC5}$) emission line dominates the far-UV spectra of M dwarf stars, but strong absorption from neutral hydrogen in the interstellar medium makes obs…
The Far Ultraviolet M-dwarf Evolution Survey. I. The Rotational Evolution of High-Energy Emissions
J. Sebastian Pineda, Allison Youngblood, Kevin France
M-dwarf stars are prime targets for exoplanet searches because of their close proximity and favorable properties for both planet detection and characterization. However, the potent…
The Mega-MUSCLES Spectral Energy Distribution Of TRAPPIST-1
David J. Wilson, Cynthia S. Froning, Girish M. Duvvuri +19
We present a 5A-100um Spectral Energy Distribution (SED) of the ultracool dwarf star TRAPPIST-1, obtained as part of the Mega-MUSCLES Treasury Survey. The SED combines ultraviolet…
Reconstructing the Extreme Ultraviolet Emission of Cool Dwarfs Using Differential Emission Measure Polynomials
Girish M. Duvvuri, J. Sebastian Pineda, Zachory K. Berta-Thompson +16
Characterizing the atmospheres of planets orbiting M dwarfs requires understanding the spectral energy distributions of M dwarfs over planetary lifetimes. Surveys like MUSCLES, HAZ…
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…