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A VLBI resolution of the Pleiades distance controversy
TLDR
An absolute trigonometric parallax distance measurement to the Pleiades cluster that uses very long baseline radio interferometry (VLBI) is presented, which is the most accurate and precise yet presented for the cluster and is incompatible with the Hipparcos distance determination. Expand
The H I opacity of the intergalactic medium at redshifts 1.6 < z < 3.2
We use high-quality echelle spectra of 24 quasi-stellar objects to provide a calibrated measurement of the total amount of Lyα forest absorption (DA) over the redshift range 2.2 < z < 3.2. OurExpand
The VLA Nascent Disk and Multiplicity Survey of Perseus Protostars (VANDAM). II. Multiplicity of Protostars in the Perseus Molecular Cloud
We present a multiplicity study of all known protostars (94) in the Perseus molecular cloud from a Karl G. Jansky Very Large Array (VLA) survey at Ka-band (8 mm and 1 cm) and C-band (4 cm and 6.6Expand
A triple protostar system formed via fragmentation of a gravitationally unstable disk
TLDR
Observations of dust and molecular gas emission reveal a disk with a spiral structure surrounding the three protostars in the triple protostar system L1448 IRS3B that appears susceptible to disk fragmentation at radii between 150 and 320 astronomical units, consistent with models for a protostellar disk that has recently undergone gravitational instability, spawning one or two companion stars. Expand
ECHOES OF A DECAYING PLANETARY SYSTEM: THE GASEOUS AND DUSTY DISKS SURROUNDING THREE WHITE DWARFS
We have performed a comprehensive ground-based observational program aimed at characterizing the circumstellar material orbiting three single white dwarf stars previously known to possess gaseousExpand
ANCIENT PLANETARY SYSTEMS ARE ORBITING A LARGE FRACTION OF WHITE DWARF STARS
Infrared studies have revealed debris likely related to planet formation in orbit around ~30% of youthful, intermediate mass, main-sequence stars. We present evidence, based on atmospheric pollutionExpand
The Chemical Composition of an Extrasolar Minor Planet
We report the relative abundances of 17 elements in the atmosphere of the white dwarf star GD 362, material that, very probably, was contained previously in a large asteroid or asteroids withExpand
Detailed compositional analysis of the heavily polluted DBZ white dwarf SDSS J073842.56+183509.06: A window on planet formation?
We present a new model atmosphere analysis of the most metal-contaminated white dwarf known, the DBZ SDSS J073842.56+183509.06. Using new high-resolution spectroscopic observations taken with KeckExpand
THE AGE OF THE HD 15407 SYSTEM AND THE EPOCH OF FINAL CATASTROPHIC MASS ACCRETION ONTO TERRESTRIAL PLANETS AROUND SUN-LIKE STARS
From optical spectroscopic measurements we determine that the HD 15407 binary system is ~80?Myr old. The primary star, HD 15407A (spectral type F5 V), exhibits strong mid-infrared excess emissionExpand
TW HYA Association Membership and New WISE-detected Circumstellar Disks
We assess the current membership of the nearby, young TW Hydrae association and examine newly proposed members with the Wide-field Infrared Survey Explorer (WISE) to search for infrared excessExpand
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