Search Publications
HST/WFC3 grism observations of z ∼ 1 clusters: the cluster versus field stellar mass-size relation and evidence for size growth of quiescent galaxies from minor mergers
Demarco, R.; Brammer, G. B.; Matharu, J. +13 more
Minor mergers are thought to be responsible for the size growth of quiescent field galaxies with decreasing redshift. We test this hypothesis using the cluster environment as a laboratory. Satellite galaxies in clusters move at high velocities, making mergers between them rare. The stellar mass-size relation in 10 clusters and in the field is meas…
Aggregate Hazes in Exoplanet Atmospheres
de Pater, Imke; Morley, Caroline V.; Gao, Peter +1 more
Photochemical hazes have frequently been used to interpret exoplanet transmission spectra that show an upward slope toward shorter wavelengths and weak molecular features. While previous studies have only considered spherical haze particles, photochemical hazes composed of hydrocarbon aggregate particles are common throughout the solar system. We …
HATS-70b: A 13 MJ Brown Dwarf Transiting an A Star
Henning, T.; Mancini, L.; Rabus, M. +23 more
We report the discovery of HATS-70b, a transiting brown dwarf at the deuterium burning limit. HATS-70b has a mass of {M}p={12.9}-1.6+1.8 {M}Jup} and a radius of {R}p={1.384}-0.074+0.079 {R}Jup}, residing in a close-in orbit with a period of 1.89 days. The host …
Blobs, spiral arms, and a possible planet around HD 169142
Henning, T.; Fantinel, D.; D'Orazi, V. +24 more
Context. Young planets are expected to cause cavities, spirals, and kinematic perturbations in protostellar disks that may be used to infer their presence. However, a clear detection of still-forming planets embedded within gas-rich disks is still rare.
Aims: HD 169142 is a very young Herbig Ae-Be star surrounded by a pre-transitional disk, c…
Mars atmospheric chemistry simulations with the GEM-Mars general circulation model
Daerden, F.; Neary, L.; Viscardy, S. +5 more
General Circulation Models with interactive physical and chemistry processes are the state-of-the-art tools for an integrated view and understanding of the Martian atmosphere and climate system. The GEM-Mars model currently includes 16 tracers for chemical composition and applies a fully online, interactive calculation of the photo- and gas phase …
The COS CGM Compendium. III. Metallicity and Physical Properties of the Cool Circumgalactic Medium at z ≲ 1
Lehner, Nicolas; Howk, J. Christopher; O'Meara, John M. +3 more
We characterize the metallicities and physical properties of cool, photoionized gas in a sample of 152 z ≲ 1 strong Lyα forest systems (SLFSs, absorbers with 15 < log N H I < 16.2). The sample is drawn from our Cosmic Origins Spectrograph (COS) circumgalactic medium compendium (CCC), an ultraviolet survey of H I-selected circumga…
Varstrometry for Off-nucleus and Dual Sub-Kpc AGN (VODKA): How Well Centered Are Low-z AGN?
Shen, Yue; Hwang, Hsiang-Chih; Liu, Xin +1 more
Off-nucleus active galactic nuclei (AGN) can be signposts of inspiraling supermassive black holes (SMBHs) on galactic scales, or accreting SMBHs recoiling after the coalescence of an SMBH binary or slingshot from three-body interactions. Because of the stochastic variability of AGN, the measured photocenter of an unresolved AGN-host system will di…
Diagnosing solar wind origins using in situ measurements in the inner heliosphere
Matteini, L.; Horbury, T. S.; Stansby, D.
Robustly identifying the solar sources of individual packets of solar wind measured in interplanetary space remains an open problem. We set out to see if this problem is easier to tackle using solar wind measurements closer to the Sun than 1 au, where the mixing and dynamical interaction of different solar wind streams is reduced. Using measuremen…
Mapping the Northern Galactic Disk Warp with Classical Cepheids
Soszyński, I.; Udalski, A.; Szymański, M. K. +11 more
We present an updated three dimensional map of the Milky Way based on a sample of 2431 classical Cepheid variable stars, supplemented with about 200 newly detected classical Cepheids from the OGLE survey. The new objects were discovered as a result of a dedicated observing campaign of the ≈280 square degree extension of the OGLE footprint of the G…
An Initial Overview of the Extent and Structure of Recent Star Formation within the Serpens Molecular Cloud Using Gaia Data Release 2
Herczeg, Gregory J.; Jose, Jessy; Johnstone, Doug +7 more
The dense clusters within the Serpens Molecular Cloud are among the most active regions of nearby star formation. In this paper, we use Gaia DR2 parallaxes and proper motions to statistically measure ∼1167 kinematic members of Serpens, few of which have been previously identified, to evaluate the star formation history of the complex. The optical …