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A close halo of large transparent grains around extreme red giant stars
TLDR
Spatially resolved, multiwavelength observations of circumstellar dust shells of three stars on the asymptotic giant branch of the Hertzsprung–Russell diagram show that transparency usually implies insufficient radiative pressure to drive a wind, the radiation field can accelerate these large grains through photon scattering rather than absorption—a plausible mass loss mechanism for lower-amplitude pulsating stars. Expand
MAPPING THE SHORES OF THE BROWN DWARF DESERT. II. MULTIPLE STAR FORMATION IN TAURUS-AURIGA
We have conducted a high-resolution imaging study of the Taurus-Auriga star-forming region in order to characterize the primordial outcome of multiple star formation and the extent of the brown dwarfExpand
Mapping the Shores of the Brown Dwarf Desert. I. Upper Scorpius
We present the results of a survey for stellar and substellar companions to 82 young stars in the nearby OB association Upper Scorpius. This survey used nonredundant aperture mask interferometry toExpand
Imaging the Surface of Altair
TLDR
Using optical long-baseline interferometry, a near-infrared image of the rapidly rotating hot star Altair is constructed with a resolution of <1 milliarcsecond that clearly reveals the strong effect of gravity darkening on the highly distorted stellar photosphere. Expand
Spectroastrometric Imaging of Molecular Gas within Protoplanetary Disk Gaps
We present velocity-resolved spectroastrometric imaging of the 4.7 µm rovibrational lines of CO gas in protoplanetary disks using the CRIRES high-resolution infrared spectrometer on the Very LargeExpand
LkCa 15: A YOUNG EXOPLANET CAUGHT AT FORMATION?
Young and directly imaged exoplanets offer critical tests of planet-formation models that are not matched by radial velocity surveys of mature stars. These targets have been extremely elusive toExpand
The Role of Multiplicity in Disk Evolution and Planet Formation
The past decade has seen a revolution in our understanding of protoplanetary disk evolution and planet formation in single-star systems. However, the majority of solar-type stars form in binaryExpand
THE CHARA ARRAY ANGULAR DIAMETER OF HR 8799 FAVORS PLANETARY MASSES FOR ITS IMAGED COMPANIONS
HR 8799 is an hF0 mA5 γ Doradus-, λ Bootis-, Vega-type star best known for hosting four directly imaged candidate planetary companions. Using the CHARA Array interferometer, we measure HR 8799'sExpand
The GALAH Survey: Second Data Release
The Galactic Archaeology with HERMES (GALAH) survey is a large-scale stellar spectroscopic survey of theMilkyWay, designed to deliver complementary chemical information to a large number of starsExpand
Two wide planetary-mass companions to solar-type stars in upper scorpius
At wide separations, planetary-mass and brown dwarf companions to solar-type stars occupy a curious region of parameter space not obviously linked to binary star formation or solar system scaleExpand
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