We present extensive optical photometric and spectroscopic observations, from 4 to 482 days after explosion, of the Type II-plateau (II-P) supernova (SN)...
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PublicationThe Type II-plateau Supernova 2017eaw in NGC 6946 and Its Red Supergiant Progenitor
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PublicationThe Typical Massive Quiescent Galaxy at z ∼ 3 is a Post-starburst
We have obtained spectroscopic confirmation with Hubble Space Telescope WFC3/G141 of a first sizeable sample of nine quiescent galaxies at 2.4 < z < 3.3. Their...
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PublicationThe Ultraviolet Spectrum and Physical Properties of the Mass Donor Star in HD 226868 = Cygnus X-1
We present an examination of high-resolution, ultraviolet (UV) spectroscopy from Hubble Space Telescope of the photospheric spectrum of the O-supergiant in the...
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PublicationThe Undiscovered Ultradiffuse Galaxies of the Local Group
Ultradiffuse galaxies (UDGs) are attractive candidates to probe cosmological models and test theories of galaxy formation at low masses; however, they are...
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PublicationThe Unrelaxed Dynamical Structure of the Galaxy Cluster Abell 85
For the first time, we explore the dynamics of the central region of a galaxy cluster within r 500 ∼ 600 h‑1 kpc from its center by combining optical and X-ray...
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PublicationThe Unusual 2001 Periastron Passage in the ``Clockwork'' Colliding-Wind Binary WR 140
We follow, using both optical spectroscopy and photometry, the ``textbook'' colliding-wind WR+O binary WR 140 through and between the periastron passages of...
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PublicationThe Updated BaSTI Stellar Evolution Models and Isochrones. I. Solar-scaled Calculations
We present an updated release of the BaSTI (a Bag of Stellar Tracks and Isochrones) stellar model and isochrone library for a solar-scaled heavy element...
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PublicationThe Value of the Fine Structure Constant over Cosmological Times
The optical spectra of objects classified as QSOs in the Sloan Digital Sky Survey Data Release 6 are analyzed with the aim of determining the value of the fine...
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PublicationThe Variable Radio-to-X-Ray Spectrum of the Magnetar XTE J1810-197
We have observed the 5.54 s anomalous X-ray pulsar XTE J1810-197 at radio, millimeter, and infrared (IR) wavelengths, with the aim of learning about its...