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A close halo of large transparent grains around extreme red giant stars
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
High-resolution imaging of dust shells by using Keck aperture masking and the IOTA interferometer
We present first results of an experiment to combine data from Keck aperture masking and the Infrared-Optical Telescope Array to image the circumstellar environments of evolved stars with ~20 masExpand
A Likely Close-in Low-mass Stellar Companion to the Transitional Disk Star HD 142527
With the uniquely high contrast within 0.''1 ({Delta}mag(L') = 5-6.5 mag) available using Sparse Aperture Masking with NACO at Very Large Telescope, we detected asymmetry in the flux from the HerbigExpand
Accreting protoplanets in the LkCa 15 transition disk
Exoplanet detections have revolutionized astronomy, offering new insights into solar system architecture and planet demographics. While nearly 1,900 exoplanets have now been discovered and confirmed,Expand
γ2 Velorum: orbital solution and fundamental parameter determination with SUSI
The first complete orbital solution for the double-lined spectroscopic binary system γ 2 Velorum, obtained from measurements with the Sydney University Stellar Interferometer (SUSI), is presented.Expand
Masses of Astrometrically Discovered and Imaged Binaries: G78-28AB and GJ 231.1BC
The Stellar Planet Survey (STEPS) is an ongoing astrometric search for giant planets and brown dwarfs around a sample of ~30 M dwarfs. We have discovered several low-mass companions by measuring theExpand
The last gasps of VY Canis Majoris: Aperture synthesis and adaptive optics imagery
We present new observations of the red supergiant VY CMa at 1.25, 1.65, 2.26, 3.08, and 4.8 km. Two complementary observational techniques were utilized: nonredundant aperture masking on the 10 mExpand
Mid-infrared size survey of young stellar objects : description of keck segment-tilting experiment and basic results
The mid-infrared properties of pre-planetary disks are sensitive to the temperature and flaring profiles of disks for the regions where planet formation is expected to occur. In order to constrainExpand
A companion candidate in the gap of the T Chamaeleontis transitional disk
Context. T Cha is a young star surrounded by a cold disk. The presence of a gap within its disk, inferred from fitting to the spectral energy distribution, has suggested on-going planetaryExpand