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…
Intense C III] λλ1907,1909 emission from a strong Lyman continuum emitting galaxy
Chisholm, J.; Schaerer, D.; Thuan, T. X. +5 more
We have obtained the first complete ultraviolet (UV) spectrum of a strong Lyman continuum (LyC) emitter at low redshift - the compact, low-metallicity, star-forming galaxy J1154+2443 - with a Lyman continuum escape fraction of 46% discovered recently. The Space Telescope Imaging Spectrograph spectrum shows strong Lyα and C III] λ1909 emission, as …
Stellar population of the superbubble N 206 in the LMC. I. Analysis of the Of-type stars
Hamann, W. -R.; Gallagher, J. S.; Oskinova, L. M. +5 more
Context. Massive stars severely influence their environment by their strong ionizing radiation and by the momentum and kinetic energy input provided by their stellar winds and supernovae. Quantitative analyses of massive stars are required to understand how their feedback creates and shapes large scale structures of the interstellar medium. The gi…
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…
Estimate of the water flow duration in large Martian fluvial systems
Di Achille, Gaetano; Mancarella, Francesca; Orofino, Vincenzo +1 more
The presence of ancient fluvial systems on Mars, known as valley networks, is considered one of the most compelling evidence that liquid water was once stable on the planet's surface.
To understand the formation mechanisms of these valleys and to acquire information on the ancient climatic conditions of the planet, we determined the formation…Rock fragment and spatial variation of soil hydraulic parameters are necessary on soil water simulation on the stony-soil hillslope
Lai, Xiaoming; Zhu, Qing; Zhou, Zhiwen +1 more
Whether the spatial variation and influence of rock fragment contents (RFCs) on soil hydraulic parameters (SHPs) should be jointly considered in the soil water simulation have been less investigated in previous studies. In this study, we tested whether considering these factors were necessary in the soil water simulation on a representative stony-…