Search Publications
CLEAR. I. Ages and Metallicities of Quiescent Galaxies at 1.0 < z < 1.8 Derived from Deep Hubble Space Telescope Grism Data
Papovich, Casey; Dickinson, Mark; Giavalisco, Mauro +14 more
We use deep Hubble Space Telescope spectroscopy to constrain the metallicities and (light-weighted) ages of massive ({log}{M}* /{M}⊙ ≳ 10) galaxies selected to have quiescent stellar populations at 1.0 < z < 1.8. The data include twelve-orbit depth coverage with the WFC3/G102 grism covering ∼8000 < λ < 11,500 Å at…
Recovering Thermodynamics from Spectral Profiles observed by IRIS: A Machine and Deep Learning Approach
De Pontieu, Bart; Gošić, Milan; Sainz Dalda, Alberto +1 more
Inversion codes allow the reconstruction of a model atmosphere from observations. With the inclusion of optically thick lines that form in the solar chromosphere, such modeling is computationally very expensive because a non-LTE evaluation of the radiation field is required. In this study, we combine the results provided by these traditional metho…
New Constraints From Dust Lines on the Surface Densities of Protoplanetary Disks
Murray-Clay, Ruth; Pérez, Laura M.; Powell, Diana +2 more
We present new determinations of disk surface density, independent of an assumed dust opacity, for a sample of seven bright, diverse, protoplanetary disks using measurements of disk dust lines. We develop a robust method for determining the location of dust lines by modeling disk interferometric visibilities at multiple wavelengths. The disks in o…
Revealing the Stellar Mass and Dust Distributions of Submillimeter Galaxies at Redshift 2
Thomson, A. P.; Magnelli, B.; Ivison, R. J. +35 more
We combine high-resolution ALMA and HST/CANDELS observations of 20 submillimeter galaxies (SMGs), predominantly from the AS2UDS survey at z ≃ 2, with bright rest-frame optical counterparts ({K}{{s}}≲ 22.9) to investigate the resolved structural properties of their dust and stellar components. We derive two-dimensional stellar-mass distr…
High-resolution ALMA Observations of HD 100546: Asymmetric Circumstellar Ring and Circumplanetary Disk Upper Limits
Pineda, Jaime E.; Testi, Leonardo; Garufi, Antonio +7 more
We present long-baseline Atacama Large Millimeter/submillimeter Array observations of the 870 µm dust continuum emission and CO (3-2) from the protoplanetary disk around the Herbig Ae/Be star HD 100546, which is one of the few systems claimed to have two young embedded planets. These observations achieve a resolution of 4 au (3.8 mas), an rm…
A Deep View into the Nucleus of the Sagittarius Dwarf Spheroidal Galaxy with MUSE. I. Data and Stellar Population Characterization
Kacharov, N.; Böker, T.; Kamann, S. +9 more
The center of the Sagittarius dwarf spheroidal galaxy (Sgr dSph) hosts a nuclear star cluster (NSC), M54, which is the only galaxy nucleus that can be resolved into individual stars at optical wavelengths. It is thus a key target for understanding the formation of NSCs and their relation to globular clusters (GCs). We present a large Multi-Unit Sp…
The Canada-France Imaging Survey: Reconstructing the Milky Way Star Formation History from Its White Dwarf Population
Lewis, Geraint F.; Gwyn, Stephen D. J.; McConnachie, Alan W. +15 more
As the remnants of stars with initial masses ≲8 M ⊙, white dwarfs contain valuable information on the formation histories of stellar populations. In this paper, we use deep, high-quality, u-band photometry from the Canada-France Imaging Survey, griz photometry from Pan-STARRS1, as well as proper motions from Gaia DR2, to select 25,156 w…
The First Detection of 13C17O in a Protoplanetary Disk: A Robust Tracer of Disk Gas Mass
Booth, Alice S.; Ilee, John D.; Walsh, Catherine +4 more
Measurements of the gas mass are necessary to determine the planet formation potential of protoplanetary disks. Observations of rare CO isotopologues are typically used to determine disk gas masses; however, if the line emission is optically thick this will result in an underestimated disk mass. With the Atacama Large Millimeter/submillimeter Arra…
On the Mass Function, Multiplicity, and Origins of Wide-orbit Giant Planets
Wagner, Kevin; Apai, Dániel; Kratter, Kaitlin M.
A major outstanding question regarding the formation of planetary systems is whether wide-orbit giant planets form differently than close-in giant planets. We aim to establish constraints on two key parameters that are relevant for understanding the formation of wide-orbit planets: (1) the relative mass function and (2) the fraction of systems hos…
Testing the Radius Scaling Relation with Gaia DR2 in the Kepler Field
Huber, Daniel; Stello, Dennis; Serenelli, Aldo +3 more
We compare radii based on Gaia parallaxes to radii based on asteroseismic scaling relations for ∼300 dwarfs and subgiants and ∼3600 first-ascent giants from the Kepler mission. Systematics due to temperature, bolometric correction, extinction, asteroseismic radius, and the spatially correlated Gaia parallax zero-point contribute to a 2% systematic…