742 citations · 3k across the 21 of their papers we have counts for
21 papers
Detecting Weak Spectral Lines in Interferometric Data through Matched Filtering
Ryan A. Loomis, Karin I. Öberg, Sean M. Andrews +4
Modern radio interferometers enable observations of spectral lines with unprecedented spatial resolution and sensitivity. In spite of these technical advances, many lines of intere…
Modeling Seven Years of Event Horizon Telescope Observations with Radiatively Inefficient Accretion Flow Models
Avery E. Broderick, Vincent L. Fish, Michael D. Johnson +6
An initial three-station version of the Event Horizon Telescope, a millimeter-wavelength very-long baseline interferometer, has observed Sagittarius A* (Sgr A*) repeatedly from 200…
Persistent Asymmetric Structure of Sagittarius A* on Event Horizon Scales
Vincent L. Fish, Michael D. Johnson, Sheperd S. Doeleman +69
The Galactic Center black hole Sagittarius A* (Sgr A*) is a prime observing target for the Event Horizon Telescope (EHT), which can resolve the 1.3 mm emission from this source on…
The Intrinsic Shape of Sagittarius A* at 3.5-mm Wavelength
Gisela N. Ortiz-León, Michael D. Johnson, Sheperd S. Doeleman +19
The radio emission from Sgr A is thought to be powered by accretion onto a supermassive black hole of at the Galactic Center. At millimete…
Resolved Magnetic-Field Structure and Variability Near the Event Horizon of Sagittarius A*
Michael D. Johnson, Vincent L. Fish, Sheperd S. Doeleman +45
Near a black hole, differential rotation of a magnetized accretion disk is thought to produce an instability that amplifies weak magnetic fields, driving accretion and outflow. The…
Weak Turbulence in the HD 163296 Protoplanetary Disk Revealed by ALMA CO Observations
Kevin M. Flaherty, A. Meredith Hughes, Katherine A. Rosenfeld +5
Turbulence can transport angular momentum in protoplanetary disks and influence the growth and evolution of planets. With spatially and spectrally resolved molecular emission line…
A Combined Spitzer and Herschel Infrared Study of Gas and Dust in the Circumbinary Disk Orbiting V4046 Sgr
Valerie A. Rapson, Benjamin Sargent, G. Germano Sacco +6
We present results from a spectroscopic Spitzer and Herschel mid-to-far-infrared study of the circumbinary disk orbiting the evolved (age ~12-23 Myr) close binary T Tauri system V4…
Resolved Multifrequency Radio Observations of GG Tau
Sean M. Andrews, Claire J. Chandler, Andrea Isella +20
We present sub-arcsecond resolution observations of continuum emission associated with the GG Tau quadruple star system at wavelengths of 1.3, 2.8, 7.3, and 50 mm. These data confi…
Fast Radial Flows in Transition Disk Holes
Katherine A. Rosenfeld, Eugene Chiang, Sean M. Andrews
Protoplanetary "transition" disks have large, mass-depleted central cavities, yet also deliver gas onto their host stars at rates comparable to disks without holes. The paradox of…
The Structure of the Evolved Circumbinary Disk around V4046 Sgr
Katherine A. Rosenfeld, Sean M. Andrews, David J. Wilner +2
We present sensitive, sub-arcsecond resolution Submillimeter Array observations of the protoplanetary disk around the nearby, pre-main sequence spectroscopic binary V4046 Sgr. We r…
An azimuthal asymmetry in the LkHa 330 disk
Andrea Isella, Laura M. Pe'rez, John M. Carpenter +3
Theory predicts that giant planets and low mass stellar companions shape circumstellar disks by opening annular gaps in the gas and dust spatial distribution. For more than a decad…
A Spatially Resolved Vertical Temperature Gradient in the HD 163296 Disk
Katherine A. Rosenfeld, Sean M. Andrews, A. Meredith Hughes +2
We analyze sensitive, sub-arcsecond resolution ALMA Science Verification observations of CO emission lines in the protoplanetary disk hosted by the young, isolated Ae star HD 16329…
The Mass Dependence Between Protoplanetary Disks and their Stellar Hosts
Sean M. Andrews, Katherine A. Rosenfeld, Adam L. Kraus +1
We present a substantial extension of the mm-wave continuum photometry catalog for Taurus circumstellar dust disks. Combining new Submillimeter Array data with measurements in the…
First detection of c-C3H2 in a circumstellar disk
Chunhua Qi, Karin Oberg, David Wilner +1
We report the first detection of c-C3H2 in a circumstellar disk. The c-C3H2 J=6-5 line (217.882 GHz) is detected and imaged through Atacama Large Millimeter Array (ALMA) Science Ve…
Millimeter Emission Structure in the first ALMA Image of the AU Mic Debris Disk
Meredith A. MacGregor, David J. Wilner, Katherine A. Rosenfeld +9
We present 1.3 millimeter ALMA Cycle 0 observations of the edge-on debris disk around the nearby, ~10 Myr-old, M-type star AU Mic. These observations obtain 0.6 arcsec (6 AU) resol…
A Disk-based Dynamical Mass Estimate for the Young Binary V4046 Sgr
Katherine A. Rosenfeld, Sean M. Andrews, David J. Wilner +1
We present sensitive, arcsecond-resolution Submillimeter Array observations of the 12CO J=2-1 line emission from the circumstellar disk orbiting the double-lined spectroscopic bina…
Matryoshka Holes: Nested Emission Rings in the Transitional Disk Oph IRS 48
Joanna M. Brown, Katherine A. Rosenfeld, Sean M. Andrews +2
The processes that form transition disks - disks with depleted inner regions - are not well understood; possible scenarios include planet formation, grain growth and photoevaporati…
Kinematics of the CO Gas in the Inner Regions of the TW Hya Disk
Katherine A. Rosenfeld, Chunhua Qi, Sean M. Andrews +7
We present a detailed analysis of the spatially and spectrally resolved 12CO J=2-1 and J=3-2 emission lines from the TW Hya circumstellar disk, based on science verification data f…
The TW Hya Disk at 870 microns: Comparison of CO and Dust Radial Structures
Sean M. Andrews, David J. Wilner, A. M. Hughes +9
We present high resolution (0.3" = 16 AU), high signal-to-noise ratio Submillimeter Array observations of the 870 microns (345 GHz) continuum and CO J=3--2 line emission from the p…
A Closer Look at the LkCa 15 Protoplanetary Disk
Sean M. Andrews, Katherine A. Rosenfeld, David J. Wilner +1
We present 870 micron observations of dust continuum emission from the LkCa 15 protoplanetary disk at high angular resolution (with a characteristic scale of 0.25" = 35 AU), obtain…
Caching and Interpolated Likelihoods: Accelerating Cosmological Monte Carlo Markov Chains
Adam Bouland, Richard Easther, Katherine Rosenfeld
We describe a novel approach to accelerating Monte Carlo Markov Chains. Our focus is cosmological parameter estimation, but the algorithm is applicable to any problem for which the…