Search Publications
The Evolution and Origin of Ionized Gas Velocity Dispersion from z ∼ 2.6 to z ∼ 0.6 with KMOS3D
Lutz, D.; Wuyts, S.; Förster Schreiber, N. M. +27 more
We present the 0.6 < z < 2.6 evolution of the ionized gas velocity dispersion in 175 star-forming disk galaxies based on data from the full KMOS3D integral field spectroscopic survey. In a forward-modeling Bayesian framework including instrumental effects and beam-smearing, we fit simultaneously the observed galaxy velocity and ve…
K2 Rotation Periods for Low-mass Hyads and a Quantitative Comparison of the Distribution of Slow Rotators in the Hyades and Praesepe
Cargile, P. A.; Agüeros, M. A.; Douglas, S. T. +4 more
We analyze K2 light curves for 132 low-mass (1 M ⊙ ≳ M * ≳ 0.1 M ⊙) members of the 600-800 Myr old Hyades cluster and measure rotation periods ({P}rot}) for 116 of these stars. These include 93 stars with no prior {P}rot} measurements; the total number of Hyads with a known {P}rot} …
Short GRB 160821B: A Reverse Shock, a Refreshed Shock, and a Well-sampled Kilonova
Pian, E.; Greiner, J.; Fruchter, A. S. +31 more
We report our identification of the optical afterglow and host galaxy of the short-duration gamma-ray burst sGRB 160821B. The spectroscopic redshift of the host is z = 0.162, making it one of the lowest redshift short-duration gamma-ray bursts (sGRBs) identified by Swift. Our intensive follow-up campaign using a range of ground-based facilities as…
TESS Hunt for Young and Maturing Exoplanets (THYME): A Planet in the 45 Myr Tucana-Horologium Association
Barclay, Thomas; Vanderburg, Andrew; Hellier, Coel +49 more
Young exoplanets are snapshots of the planetary evolution process. Planets that orbit stars in young associations are particularly important because the age of the planetary system is well constrained. We present the discovery of a transiting planet larger than Neptune but smaller than Saturn in the 45 Myr Tucana-Horologium young moving group. The…
Protoplanetary Disk Rings and Gaps across Ages and Luminosities
Dong, Ruobing; Williams, Jonathan P.; van der Marel, Nienke +2 more
Since the discovery of the multiring structure of the HL Tau disk, ALMA data suggest that the dust continuum emission of many, if not all, protoplanetary disks consists of rings and gaps, no matter their spectral type or age. The origin of these gaps so far remains unclear. We present a sample study of 16 disks with multiple ring-like structures i…
TESS Discovery of an Ultra-short-period Planet around the Nearby M Dwarf LHS 3844
Deming, Drake; Torres, Guillermo; Vanderburg, Andrew +70 more
Data from the newly commissioned Transiting Exoplanet Survey Satellite has revealed a “hot Earth” around LHS 3844, an M dwarf located 15 pc away. The planet has a radius of 1.303+/- 0.022 R ⊕ and orbits the star every 11 hr. Although the existence of an atmosphere around such a strongly irradiated planet is questionable, the star is bri…
ALMA Reveals Potential Evidence for Spiral Arms, Bars, and Rings in High-redshift Submillimeter Galaxies
Smail, I.; Menten, K. M.; Brandt, W. N. +19 more
We present subkiloparsec-scale mapping of the 870 µm ALMA continuum emission in six luminous (L IR ∼ 5 × 1012 L ⊙) submillimeter galaxies (SMGs) from the ALESS survey of the Extended Chandra Deep Field South. Our high-fidelity 0.″07-resolution imaging (∼500 pc) reveals robust evidence for structures with deco…
Mapping the Stellar Halo with the H3 Spectroscopic Survey
Conroy, Charlie; Johnson, Benjamin D.; Berlind, Perry +12 more
Modern theories of galaxy formation predict that the Galactic stellar halo was hierarchically assembled from the accretion and disruption of smaller systems. This hierarchical assembly is expected to produce a high degree of structure in the combined phase and chemistry space; this structure should provide a relatively direct probe of the accretio…
Half-mass Radii for ∼7000 Galaxies at 1.0 ≤ z ≤ 2.5: Most of the Evolution in the Mass-Size Relation Is Due to Color Gradients
Barro, Guillermo; Kriek, Mariska; Price, Sedona H. +1 more
Radial mass-to-light ratio gradients cause the half-mass and half-light radii of galaxies to differ, potentially biasing studies that use half-light radii. Here we present the largest catalog to date of galaxy half-mass radii at z > 1: 7006 galaxies in the CANDELS fields at 1.0 ≤ z ≤ 2.5. The sample includes both star-forming and quiescent gala…
The Chemical Evolution of Carbon, Nitrogen, and Oxygen in Metal-poor Dwarf Galaxies
McQuinn, Kristen B. W.; Skillman, Evan D.; Erb, Dawn K. +2 more
Ultraviolet nebular emission lines are important for understanding the time evolution and nucleosynthetic origins of their associated elements, but the underlying trends of their relative abundances are unclear. We present UV spectroscopy of 20 nearby low-metallicity, high-ionization dwarf galaxies obtained using the Hubble Space Telescope. Buildi…