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The local high-velocity tail and the Galactic escape speed
Grand, Robert J. J.; Fattahi, Azadeh; Marinacci, Federico +4 more
We model the fastest moving (v_tot > 300 km s^{-1}) local (D ≲ 3 kpc) halo stars using cosmological simulations and six-dimensional Gaia data. Our approach is to use our knowledge of the assembly history and phase-space distribution of halo stars to constrain the form of the high-velocity tail of the stellar halo. Using simple analytical models…
The First Tidal Disruption Flare in ZTF: From Photometric Selection to Multi-wavelength Characterization
Cenko, S. Bradley; Riddle, Reed; Rusholme, Ben +37 more
We present Zwicky Transient Facility (ZTF) observations of the tidal disruption flare AT2018zr/PS18kh reported by Holoien et al. and detected during ZTF commissioning. The ZTF light curve of the tidal disruption event (TDE) samples the rise-to-peak exceptionally well, with 50 days of g- and r-band detections before the time of maximum light. We al…
A Spectroscopic Analysis of the California-Kepler Survey Sample. I. Stellar Parameters, Planetary Radii, and a Slope in the Radius Gap
Cunha, Katia; Smith, Verne V.; Martinez, Cintia F. +1 more
We present results from a quantitative spectroscopic analysis conducted on archival Keck/HIRES high-resolution spectra from the California-Kepler Survey (CKS) sample of transiting planetary host stars identified from the Kepler mission. The spectroscopic analysis was based on a carefully selected set of Fe I and Fe II lines, resulting in precise v…
The Degree of Alignment between Circumbinary Disks and Their Binary Hosts
Torres, Guillermo; Wilner, David J.; Macintosh, Bruce +5 more
All four circumbinary (CB) protoplanetary disks orbiting short-period (P < 20 days) double-lined spectroscopic binaries (SB2s)—a group that includes UZ Tau E, for which we present new Atacama Large Millimeter/Submillimeter Array data—exhibit sky-plane inclinations i disk that match, to within a few degrees, the sky-plane inclinations…
Driving massive molecular gas flows in central cluster galaxies with AGN feedback
Fabian, A. C.; Combes, F.; Salomé, P. +7 more
We present an analysis of new and archival ALMA observations of molecular gas in 12 central cluster galaxies. We examine emerging trends in molecular filament morphology and gas velocities to understand their origins. Molecular gas masses in these systems span 10^9 - 10^{11} M_{⊙}, far more than most gas-rich galaxies. ALMA images reveal a distrib…
Minerva-Australis. I. Design, Commissioning, and First Photometric Results
Riddle, Reed; Kane, Stephen R.; Huber, Daniel +36 more
The MINERVA-Australis telescope array is a facility dedicated to the follow-up, confirmation, characterization, and mass measurement of planets orbiting bright stars discovered by the Transiting Exoplanet Survey Satellite (TESS)—a category in which it is almost unique in the Southern Hemisphere. It is located at the University of Southern Queensla…
The Unusual Initial Mass Function of the Arches Cluster
Hosek, Matthew W., Jr.; Lu, Jessica R.; Clarkson, William I. +5 more
As a young massive cluster in the central molecular zone, the Arches cluster is a valuable probe of the stellar initial mass function (IMF) in the extreme Galactic center environment. We use multi-epoch Hubble Space Telescope observations to obtain high-precision proper-motion and photometric measurements of the cluster, calculating cluster member…
Water Vapor Vertical Profiles on Mars in Dust Storms Observed by TGO/NOMAD
Aoki, S.; Vandaele, A. C.; Daerden, F. +16 more
It has been suggested that dust storms efficiently transport water vapor from the near-surface to the middle atmosphere on Mars. Knowledge of the water vapor vertical profile during dust storms is important to understand water escape. During Martian Year 34, two dust storms occurred on Mars: a global dust storm (June to mid-September 2018) and a r…
An ALMA survey of the SCUBA-2 Cosmology Legacy Survey UKIDSS/UDS field: high-resolution dust continuum morphologies and the link between sub-millimetre galaxies and spheroid formation
Thomson, A. P.; Ivison, R. J.; Scott, D. +15 more
We present an analysis of the morphology and profiles of the dust continuum emission in 153 bright sub-millimetre galaxies (SMGs) detected with ALMA at signal-to-noise ratios of >8 in high-resolution 0.18 arcsec (∼1 kpc) 870 µm maps. We measure sizes, shapes, and light profiles for the rest-frame far-infrared emission from these luminous …
Discovery and Early Evolution of ASASSN-19bt, the First TDE Detected by TESS
Morrell, Nidia; Strader, Jay; Newman, Andrew B. +23 more
We present the discovery and early evolution of ASASSN-19bt, a tidal disruption event (TDE) discovered by the All-Sky Automated Survey for Supernovae (ASAS-SN) at a distance of d ≃ 115 Mpc and the first TDE to be detected by TESS. As the TDE is located in the TESS Continuous Viewing Zone, our data set includes 30 minute cadence observations starti…