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A Lack of Planets in 47 Tucanae from a Hubble Space Telescope Search
We report results from a large Hubble Space Telescope project to observe a significant (~34,000) ensemble of main-sequence stars in the globular cluster 47 Tucanae with a goal of defining the…
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Are There Unstable Planetary Systems around White Dwarfs?
The presence of planets around solar-type stars suggests that many white dwarfs should have relic planetary systems. While planets closer than ~5 AU will most likely not survive the…
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Closing in on a Short-Hard Burst Progenitor: Constraints from Early-Time Optical Imaging and Spectroscopy of a Possible Host Galaxy of GRB 050509b
The localization of the short-duration, hard-spectrum gamma-ray burst GRB 050509b by the Swift satellite was a watershed event. We report the discovery of the probable host galaxy, a bright…
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A Young White Dwarf Companion to Pulsar B1620-26: Evidence for Early Planet Formation
TLDR
The color and magnitude of the stellar companion indicate that it is an undermassive white dwarf of age 480 × 106 ± 140 × 106 years, which places a constraint on the recent history of this triple system and supports a scenario in which the current configuration arose through a dynamical exchange interaction in the cluster core.
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The binary star population of the young cluster NGC 1818 in the Large Magellanic Cloud
We determine the binary star fraction as a function of radius in NGC 1818, a young rich cluster in the Large Magellanic Cloud, using Hubble Space Telescope images in bands F336W (∼U) and F555W (∼V).…
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Perfluorinated alkylated substances (PFAS) in the Nordic environment Perfluorinated alkylated substances (PFAS) in the Nordic environment
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Measuring mass-loss rates from Galactic satellites
Number count profiles of many Galactic and some extra-galactic satellite systems show evidence for associated stars beyond the cut-off in density that is identified as the point of tidal limitation…
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Exotic Earths: Forming Habitable Worlds with Giant Planet Migration
TLDR
This simulation of terrestrial planet growth during and after giant planet migration is applied to close-in giant planets thought to form far from their host stars and migrate inward, through the terrestrial planet zone, via torques with a massive gaseous disk.
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THE Ĝ INFRARED SEARCH FOR EXTRATERRESTRIAL CIVILIZATIONS WITH LARGE ENERGY SUPPLIES. II. FRAMEWORK, STRATEGY, AND FIRST RESULT
We describe the framework and strategy of the Ĝ infrared search for extraterrestrial civilizations with large energy supplies, which will use the wide-field infrared surveys of WISE and Spitzer to…
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Intracluster Red Giant Stars in the Virgo Cluster
We have used the Wide Field Planetary Camera 2 on the Hubble Space Telescope to obtain deep F814W images of a blank field in the Virgo Cluster located 41' northwest of M87. We perform star counts in…
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