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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…
Origin of the Excess of High-energy Retrograde Stars in the Galactic Halo
Matsuno, Tadafumi; Aoki, Wako; Suda, Takuma
We report on the very low α-element abundances of a group of metal-poor stars with high orbital energy and with large retrograde motion in the Milky Way halo, whose excess has been reported recently from metallicity and kinematics. We constructed a sample of halo stars with measured abundances and precise kinematics, including ∼880 stars with [Fe/…
207 New Open Star Clusters within 1 kpc from Gaia Data Release 2
Sim, Gyuheon; Lee, Sang Hyun; Ann, Hong Bae +1 more
We conducted a survey of open clusters within 1 kpc from the Sun using the astrometric and photometric data of the Gaia Data Release 2. We found 655 cluster candidates by visual inspection of the stellar distributions in proper motion space and spatial distributions in l-b space. All of the 655 cluster candidates have a well defined main-sequence …
The Foundation Supernova Survey: Measuring Cosmological Parameters with Supernovae from a Single Telescope
Berger, E.; Kirshner, R. P.; Rest, A. +27 more
Measurements of the dark energy equation-of-state parameter, w, have been limited by uncertainty in the selection effects and photometric calibration of z < 0.1 Type Ia supernovae (SNe Ia). The Foundation Supernova Survey is designed to lower these uncertainties by creating a new sample of z < 0.1 SNe Ia observed on the Pan-STARRS system. He…
The Recent Burstiness of Star Formation in Galaxies at z ∼ 4.5 from Hα Measurements
Tacchella, Sandro; Larson, Kirsten L.; Faisst, Andreas L. +2 more
The redshift range z = 4-6 marks a transition phase between primordial and mature galaxy formation in which galaxies considerably increase their stellar mass, metallicity, and dust content. The study of galaxies in this redshift range is therefore important to understanding early galaxy formation and the fate of galaxies at later times. Here, we i…
The Precision of Mass Measurements Required for Robust Atmospheric Characterization of Transiting Exoplanets
Fortney, Jonathan J.; Batalha, Natalie M.; Batalha, Natasha E. +4 more
Two of Transiting Exoplanet Survey Satellite’s major science goals are to measure masses for 50 planets smaller than 4 Earth radii and to discover high-quality targets for atmospheric characterization efforts. It is important that these two goals are linked by quantifying what precision of mass constraint is required to yield robust atmospheric pr…