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Multiplicity is one of the most fundamental observable properties of massive O-type stars and offers a promising way to discriminate between massive star formation theories. Nevertheless, companionsExpand
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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
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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
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Gravitational Instabilities in Circumstellar Disks
[Abridged] Star and planet formation are the complex outcomes of gravitational collapse and angular momentum transport mediated by protostellar and protoplanetary disks. In this review we focus onExpand
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On the Role of Disks in the Formation of Stellar Systems: A Numerical Parameter Study of Rapid Accretion
We study rapidly accreting, gravitationally unstable disks with a series of idealized global, numerical experiments using the code ORION. Our numerical parameter study focuses on protostellar disks,Expand
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A triple protostar system formed via fragmentation of a gravitationally unstable disk
Binary and multiple star systems are a frequent outcome of the star formation process and as a result almost half of all stars with masses similar to that of the Sun have at least one companion star.Expand
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The Close Binary Fraction of Solar-type Stars Is Strongly Anticorrelated with Metallicity
NASA's Einstein Postdoctoral Fellowship program [PF5-160139]; National Science Foundation [AST-1410174]; NASA [ATP-140078, ATP-170070]
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An Empirical Correction for Activity Effects on the Temperatures, Radii, and Estimated Masses of Low-mass Stars and Brown Dwarfs
We present empirical relations for determining the amount by which the effective temperatures and radii—and therefore the estimated masses—of low-mass stars and brown dwarfs are altered due toExpand
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Direct imaging discovery of a Jovian exoplanet within a triple-star system
Spying a planet in a triple-star system Thousands of extrasolar planets are now known, but only a handful have been detected in direct images. Wagner et al. used sophisticated adaptive optics toExpand
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The Runts of the Litter: Why planets formed through gravitational instability can only be failed binary stars
Recent direct imaging discoveries suggest a new class of massive, distant planets around A stars. These widely separated giants have been interpreted as signs of planet formation driven byExpand
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