Search Publications
Dust-enshrouded AGNs Can Dominate Host-galaxy-scale Cold Dust Emission
Smith, Howard A.; Rosenthal, Lee J.; McKinney, Jed +4 more
It is widely assumed that long-wavelength infrared (IR) emission from cold dust (T ~ 20-40 K) is a reliable tracer of star formation even in the presence of a bright active galactic nucleus (AGN). Based on radiative transfer (RT) models of clumpy AGN tori, hot dust emission from the torus contributes negligibly to the galaxy spectral energy distri…
ALMA and IRIS Observations of the Solar Chromosphere. I. An On-disk Type II Spicule
Martínez-Sykora, Juan; De Pontieu, Bart; Chintzoglou, Georgios +7 more
We present observations of the solar chromosphere obtained simultaneously with the Atacama Large Millimeter/submillimeter Array (ALMA) and the Interface Region Imaging Spectrograph. The observatories targeted a chromospheric plage region of which the spatial distribution (split between strongly and weakly magnetized regions) allowed the study of l…
The Far Ultraviolet M-dwarf Evolution Survey. I. The Rotational Evolution of High-energy Emissions
France, Kevin; Youngblood, Allison; Pineda, J. Sebastian
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 potential habitability and atmospheric characterization of these exoplanetary systems depends critically on the history of high-energy stellar radiation from X-rays to NUV, wh…
The Atacama Cosmology Telescope: Microwave Intensity and Polarization Maps of the Galactic Center
Hasselfield, Matthew; Sifón, Cristóbal; Aiola, Simone +30 more
We present arcminute-resolution intensity and polarization maps of the Galactic center made with the Atacama Cosmology Telescope. The maps cover a 32 deg2 field at 98, 150, and 224 GHz with ∣l∣ ≤ 4°, ∣b∣ ≤ 2°. We combine these data with Planck observations at similar frequencies to create coadded maps with increased sensitivity at large…
Mapping the 3D Kinematical Structure of the Gas Disk of HD 169142
Öberg, Karin; Bae, Jaehan; Teague, Richard +1 more
The disk around HD 169142 has been suggested to host multiple embedded planets due to the range of structures observed in the dust distributions. We analyze archival Atacama Large (sub-) Millimetre Array observations of 12CO (2-1), 13CO (2-1), and C18O (2-1) to search for large-scale kinematic structures associated…
Measuring Turbulence with Young Stars in the Orion Complex
Kounkel, Marina; Li, Hui; Ha, Trung +2 more
Stars form in molecular clouds in the interstellar medium (ISM) with a turbulent kinematic state. Newborn stars therefore should retain the turbulent kinematics of their natal clouds. Gaia DR2 and APOGEE-2 surveys in combination provide three-dimensional (3D) positions and 3D velocities of young stars in the Orion Molecular Cloud Complex. Using th…
Dynamical Model of the Milky Way Using APOGEE and Gaia Data
Neumayer, Nadine; Rix, Hans-Walter; Cappellari, Michele +2 more
We construct a dynamical model of the Milky Way disk from a data set that combines Gaia EDR3 and APOGEE data throughout galactocentric radii in the range 5.0 kpc ≤ R ≤ 19.5 kpc. We make use of the spherically aligned Jeans anisotropic method to model the stellar velocities and their velocity dispersions. Building upon our previous work, our model …
A Disk and No Signatures of Tidal Distortion in the Galaxy "Lacking" Dark Matter NGC 1052-DF2
Trujillo, Ignacio; Borlaff, Alejandro S.; Monelli, Matteo +2 more
Using ultra-deep imaging (µg = 30.4 mag arcsec-2; 3σ, 10″ × 10″), we probed the surroundings of the first galaxy "lacking" dark matter (DM) KKS2000[04] (NGC 1052-DF2). Signs of tidal stripping in this galaxy would explain its claimed low content of DM. However, we find no evidence of tidal tails. In fact, the galaxy rem…
Split Peas in a Pod: Intra-system Uniformity of Super-Earths and Sub-Neptunes
Winn, Joshua N.; Millholland, Sarah C.
The planets within compact multiplanet systems tend to have similar sizes, masses, and orbital period ratios, like "peas in a pod." This pattern was detected when considering planets with radii between 1 and 4 R⊕. However, these same planets show a bimodal radius distribution, with few planets between 1.5 and 2 R⊕. The smalle…
A New Sample of Warm Extreme Debris Disks from the ALLWISE Catalog
Henning, Thomas; Pál, András; Kinemuchi, Karen +12 more
Extreme debris disks (EDDs) are rare systems with peculiarly large amounts of warm dust that may stem from recent giant impacts between planetary embryos during the final phases of terrestrial planet growth. Here we report on the identification and characterization of six new EDDs. These disks surround F5-G9 type main-sequence stars with ages >…