Search Publications
The CGM2 Survey: Quenching and the Transformation of the Circumgalactic Medium
Tripp, Todd M.; Prochaska, J. Xavier; Tejos, Nicolas +9 more
This study addresses how the incidence rate of strong O VI absorbers in a galaxy's circumgalactic medium (CGM) depends on galaxy mass and, independently, on the amount of star formation in the galaxy. We use Hubble Space Telescope/Cosmic Origins Spectrograph absorption spectroscopy of quasars to measure O VI absorption within 400 projected kpc and…
The Q Branch Cooling Anomaly Can Be Explained by Mergers of White Dwarfs and Subgiant Stars
Blouin, Simon; Shen, Ken J.; Breivik, Katelyn
Gaia's exquisite parallax measurements allowed for the discovery and characterization of the Q branch in the Hertzsprung-Russell diagram, where massive C/O white dwarfs (WDs) pause their dimming due to energy released during crystallization. Interestingly, the fraction of old stars on the Q branch is significantly higher than in the population of …
Redder than Red: Discovery of an Exceptionally Red L/T Transition Dwarf
Meisner, Aaron M.; Cushing, Michael C.; Kirkpatrick, J. Davy +24 more
We present the discovery of CWISE J050626.96+073842.4 (CWISE J0506+0738), an L/T transition dwarf with extremely red near-infrared colors discovered through the Backyard Worlds: Planet 9 citizen science project. Photometry from UKIRT and CatWISE give a (J - K)MKO color of 2.97 ± 0.03 mag and a J MKO - W2 color of 4.93 ± 0.02 …
The Surprising Evolution of the Shadow on the TW Hya Disk
Weinberger, Alycia J.; Pueyo, Laurent; Debes, John +8 more
We report new total-intensity visible-light high-contrast imaging of the TW Hya disk taken with the Space Telescope Imaging Spectrograph (STIS) on the Hubble Space Telescope. This represents the first published images of the disk with STIS since 2016, when a moving shadow on the disk surface was reported. We continue to see the shadow moving in a …
JWST/NIRCam Discovery of the First Y+Y Brown Dwarf Binary: WISE J033605.05-014350.4
Pope, Benjamin J. S.; Cushing, Michael C.; Kirkpatrick, J. Davy +25 more
We report the discovery of the first brown dwarf binary system with a Y dwarf primary, WISE J033605.05-014350.4, observed with NIRCam on JWST with the F150W and F480M filters. We employed an empirical point-spread function binary model to identify the companion, located at a projected separation of 0.″084, position angle of 295°, and with contrast…
TOI-1859b: A 64 Day Warm Jupiter on an Eccentric and Misaligned Orbit
Bieryla, Allyson; Latham, David W.; Mahadevan, Suvrath +31 more
Warm Jupiters are close-in giant planets with relatively large planet-star separations (i.e., 10 < a/R ⋆ < 100). Given their weak tidal interactions with their host stars, measurements of stellar obliquity may be used to probe the initial obliquity distribution and dynamical history for close-in gas giants. Using spectroscopic obs…
A Mixture of LBG Overdensities in the Fields of Three 6 < z < 7 Quasars: Implications for the Robustness of Photometric Selection
Finkelstein, Steven L.; Casey, Caitlin M.; Larson, Rebecca L. +5 more
The most luminous quasars at z > 6 are suspected to be both highly clustered and to reside in the most massive dark matter halos in the early universe, making them prime targets to search for galaxy overdensities and/or protoclusters. We search for Lyman-break dropout-selected galaxies using HST WFC3/ACS broadband imaging in the fields of three…
Determining Dust Properties in Protoplanetary Disks: SED-derived Masses and Settling with ALMA
Ribas, Álvaro; Espaillat, Catherine C.; Macías, Enrique +3 more
We present spectral energy distribution (SED) modeling of 338 disks around T Tauri stars from 11 star-forming regions, ranging from ~0.5 to 10 Myr old. The disk masses we infer from our SED models are typically greater than those reported from (sub)millimeter surveys by a factor of 1.5-5, with the discrepancy being generally higher for the more ma…
Kinematics, Structure, and Mass Outflow Rates of Extreme Starburst Galactic Outflows
Moustakas, John; Coil, Alison L.; Rudnick, Gregory H. +10 more
We present results on the properties of extreme gas outflows in massive (M * ~ 1011 M ⊙), compact, starburst (star formation rate, SFR~ 200 M ⊙ yr-1) galaxies at z = 0.4-0.7 with very high star formation surface densities (ΣSFR ~ 2000 M ⊙ yr-1 kpc-2)…
The HETDEX Survey Emission-line Exploration and Source Classification
Finkelstein, Steven L.; Kollatschny, Wolfram; Gebhardt, Karl +20 more
The Hobby-Eberly Telescope Dark Energy Experiment (HETDEX) is an untargeted spectroscopic survey that aims to measure the expansion rate of the universe at z ~ 2.4 to 1% precision for both H(z) and D A (z). HETDEX is in the process of mapping in excess of one million Lyα emitting (LAE) galaxies and a similar number of lower-z galaxies …