Search Publications
Probing the Inner Disk Emission of the Herbig Ae Stars HD 163296 and HD 190073
Monnier, John D.; Kraus, Stefan; Le Bouquin, Jean-Baptiste +16 more
The physical processes occurring within the inner few astronomical units of protoplanetary disks surrounding Herbig Ae stars are crucial to setting the environment in which the outer planet-forming disk evolves and put critical constraints on the processes of accretion and planet migration. We present the most complete published sample of high ang…
Seasonal Evolution of Titan's Stratosphere Near the Poles
Flasar, F. M.; Lavvas, P.; Coustenis, A. +5 more
In this Letter, we report the monitoring of seasonal evolution near Titan’s poles. We find Titan’s south pole to exhibit since 2010 a strong temperature decrease and a dramatic enhancement of several trace species such as complex hydrocarbons and nitriles (HC3N and C6H6 in particular) previously only observed at hi…
A Model Connecting Galaxy Masses, Star Formation Rates, and Dust Temperatures across Cosmic Time
Conroy, Charlie; Johnson, Benjamin D.; Loeb, Abraham +2 more
We investigate the evolution of dust content in galaxies from redshifts z = 0 to z = 9.5. Using empirically motivated prescriptions, we model galactic-scale properties—including halo mass, stellar mass, star formation rate, gas mass, and metallicity—to make predictions for the galactic evolution of dust mass and dust temperature in main-sequence g…
The Age of the Old Metal-poor Globular Cluster NGC 6397 Using WFC3/IR Photometry
Brown, Thomas M.; Gennaro, Mario; Cohen, Roger E. +2 more
Globular clusters (GCs) in the Milky Way represent the ideal laboratory to establish the age of the oldest stellar populations and to measure the color-magnitude relation of stars. Infrared (IR) photometry of these objects provides a new opportunity to accomplish this task. In particular, at low stellar masses, the stellar main sequence (MS) in an…
A High-precision Trigonometric Parallax to an Ancient Metal-poor Globular Cluster
Riess, A.; Brown, T. M.; Casertano, S. +5 more
Using the Wide Field Camera 3 (WFC3) on the Hubble Space Telescope (HST), we have obtained a direct trigonometric parallax for the nearest metal-poor globular cluster, NGC 6397. Although trigonometric parallaxes have been previously measured for many nearby open clusters, this is the first parallax for an ancient metal-poor population—one that is …
RELICS: A Strong Lens Model for SPT-CLJ0615-5746, a z = 0.972 Cluster
Mahler, Guillaume; Frye, Brenda L.; Bradač, Maruša +30 more
We present a lens model for the cluster SPT-CLJ0615-5746, which is the highest-redshift (z = 0.972) system in the Reionization of Lensing Clusters Survey, making it the highest-redshift cluster for which a full, strong lens model is published. We identify three systems of multiply imaged lensed galaxies, two of which we spectroscopically confirm a…
Observations of SN 2015F Suggest a Correlation between the Intrinsic Luminosity of Type Ia Supernovae and the Shape of Their Light Curves >900 Days after Explosion
Zurek, David R.; Rest, Armin; Riess, Adam G. +6 more
The late-time light curves of Type Ia supernovae (SNe Ia), observed >900 days after explosion, present the possibility of a new diagnostic for SN Ia progenitor and explosion models. First, however, we must discover what physical process (or processes) leads to the slow-down of the light curve relative to a pure 56Co decay, as observe…
Plasma Evolution within an Erupting Coronal Cavity
Long, David M.; Harra, Louise K.; Matthews, Sarah A. +5 more
Coronal cavities have previously been observed to be associated with long-lived quiescent filaments and are thought to correspond to the associated magnetic flux rope. Although the standard flare model predicts a coronal cavity corresponding to the erupting flux rope, these have only been observed using broadband imaging data, restricting an analy…
Multiwavelength Observations of a New Redback Millisecond Pulsar Candidate: 3FGL J0954.8-3948
Cheng, K. S.; Strader, Jay; Kong, Albert K. H. +6 more
We present a multiwavelength study of the unassociated Fermi Large Area Telescope (LAT) source, 3FGL J0954.8-3948, which is likely the γ-ray counterpart of a 9.3 hr binary in the field. With more than 9 years of Pass 8 LAT data, we updated the γ-ray spectral properties and the LAT localization of the γ-ray source. While the binary lies outside the…
The Duration of Energy Deposition on Unresolved Flaring Loops in the Solar Corona
Polito, Vanessa; Warren, Harry P.; Crump, Nicholas A. +1 more
Solar flares form and release energy across a large number of magnetic loops. The global parameters of flares, such as the total energy released, duration, physical size, etc., are routinely measured, and the hydrodynamics of a coronal loop subjected to intense heating have been extensively studied. It is not clear, however, how many loops compris…