Search Publications
Disk Evolution Study Through Imaging of Nearby Young Stars (DESTINYS): Late Infall Causing Disk Misalignment and Dynamic Structures in SU Aur
Flock, Mario; Ménard, François; Bae, Jaehan +19 more
Gas-rich circumstellar disks are the cradles of planet formation. As such, their evolution will strongly influence the resulting planet population. In the ESO DESTINYS large program, we study these disks within the first 10 Myr of their development with near-infrared scattered-light imaging. Here we present VLT/SPHERE polarimetric observations of …
The Panchromatic Afterglow of GW170817: The Full Uniform Data Set, Modeling, Comparison with Previous Results, and Implications
Frail, D. A.; Hallinan, G.; Murphy, E. J. +35 more
We present the full panchromatic afterglow light-curve data of GW170817, including new radio data as well as archival optical and X-ray data, between 0.5 and 940 days post-merger. By compiling all archival data and reprocessing a subset of it, we have evaluated the impact of differences in data processing or flux determination methods used by diff…
Statistical Properties of Superflares on Solar-type Stars: Results Using All of the Kepler Primary Mission Data
Notsu, Yuta; Maehara, Hiroyuki; Namekata, Kosuke +5 more
We report the latest statistical analyses of superflares on solar-type (G-type main-sequence; effective temperature is 5100-6000 K) stars using all of the Kepler primary mission data and Gaia Data Release 2 catalog. We updated the flare detection method from our previous studies by using a high-pass filter to remove rotational variations caused by…
Structures of Dwarf Satellites of Milky Way-like Galaxies: Morphology, Scaling Relations, and Intrinsic Shapes
Greene, Jenny E.; Beaton, Rachael L.; Carlsten, Scott G. +2 more
The structure of a dwarf galaxy is an important probe of the effects of stellar feedback and environment. Using an unprecedented sample of 223 low-mass satellites from the ongoing Exploration of Local Volume Satellites survey, we explore the structures of dwarf satellites in the mass range 105.5 < M ⋆ < 108.5…
Circumgalactic Mg II Emission from an Isotropic Starburst Galaxy Outflow Mapped by KCWI
Hennawi, Joseph F.; Prochaska, J. Xavier; Coil, Alison L. +3 more
We present spatially resolved spectroscopy from the Keck Cosmic Web Imager (KCWI) of a star-forming galaxy at z = 0.6942, which shows emission from the Mg II λλ2796, 2803 doublet in the circumgalactic medium (CGM) extending ∼37 kpc at 3σ significance in individual spaxels (1σ detection limit 4.8 × 10-19 erg s-1 cm-2
Characterizing Extreme Emission-line Galaxies. I. A Four-zone Ionization Model for Very High-ionization Emission
Skillman, Evan D.; Chisholm, John; Erb, Dawn K. +3 more
Stellar population models produce radiation fields that ionize oxygen up to O+2, defining the limit of standard H II region models (<54.9 eV). Yet, some extreme emission-line galaxies, or EELGs, have surprisingly strong emission originating from much higher ionization potentials. We present UV HST/COS and optical LBT/MODS spectra of …
Dissecting the Local Environment of FRB 190608 in the Spiral Arm of its Host Galaxy
Chittidi, Jay S.; Simha, Sunil; Mannings, Alexandra +15 more
We present a high-resolution analysis of the host galaxy of fast radio burst (FRB) 190608, an SB(r)c galaxy at z = 0.11778 (hereafter HG 190608), to dissect its local environment and its contributions to the FRB properties. Our Hubble Space Telescope Wide Field Camera 3 ultraviolet and visible light image reveals that the subarcsecond localization…
Turbulent Gas in Lensed Planck-selected Starbursts at z ∼ 1-3.5
Frayer, D. T.; Frye, B. L.; Jiménez-Andrade, E. F. +26 more
Dusty star-forming galaxies at high redshift (1 < z < 3) represent the most intense star-forming regions in the universe. Key aspects to these processes are the gas heating and cooling mechanisms, and although it is well known that these galaxies are gas-rich, little is known about the gas excitation conditions. Only a few detailed radiative…
Elevated r-process Enrichment in Gaia Sausage and Sequoia
Myeong, G. C.; Kobayashi, Chiaki; Belokurov, Vasily +6 more
The Gaia Sausage (GS) and the Sequoia represent the major accretion events that formed the stellar halo of the Milky Way. A detailed chemical study of these main building blocks provides a pristine view of the early steps of the Galaxy's assembly. We present the results of the analysis of the UVES high-resolution spectroscopic observations at the …
A Diversity of Wave-driven Presupernova Outbursts
Fuller, Jim; Wu, Samantha
Many core-collapse supernova (SN) progenitors show indications of enhanced pre-SN mass loss and outbursts, some of which could be powered by wave energy transport within the progenitor star. Depending on the star's structure, convectively excited waves driven by late-stage nuclear burning can carry substantial energy from the core to the envelope,…