The existence of a hypothetical Planet Nine lurking in the outer solar system has been invoked as a plausible explanation for the anomalous clustering in the...
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PublicationA Candidate Location for Planet Nine from an Interstellar Meteoroid: The Messenger Hypothesis
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PublicationA Candidate Massive Black Hole in the Low-metallicity Dwarf Galaxy Pair Mrk 709
The incidence and properties of present-day dwarf galaxies hosting massive black holes (BHs) can provide important constraints on the origin of high-redshift BH...
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PublicationA candidate short-period sub-Earth orbiting Proxima Centauri
Context. Proxima Centauri is the closest star to the Sun. This small, low-mass, mid M dwarf is known to host an Earth-mass exoplanet with an orbital period of...
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PublicationA candidate super-Earth planet orbiting near the snow line of Barnard's star
Barnard's star is a red dwarf, and has the largest proper motion (apparent motion across the sky) of all known stars. At a distance of 1.8 parsecs1, it is the...
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PublicationA Canis Major Overdensity Imaging Survey. I. Stellar Content and Star-Count Maps: A Distinctly Elongated Body of Main-Sequence Stars
We present the first results from a large-area (~80deg×20deg), sparsely sampled, two-filter (B and R) imaging survey toward the Canis Major stellar overdensity...
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PublicationA carbon dwarf wearing a Necklace: first proof of accretion in a post-common-envelope binary central star of a planetary nebula with jets
The formation of collimated outflows or jets in planetary nebulae (PNe) is not well understood. There is no evidence for active accretion discs in PNe, making...
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PublicationA Case against a Significant Detection of Precession in the Galactic Warp
Recent studies of warp kinematics using Gaia DR2 data have produced detections of warp precession for the first time, which greatly exceeds theoretical...
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PublicationA case against an X-shaped structure in the Milky Way young bulge
Context. A number of recent papers have claimed the discovery of an X-shape structure in the bulge of our Galaxy in the population of the red clumps. Aims: We...
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PublicationA case study of hurdle and generalized additive models in astronomy: the escape of ionizing radiation
The dark ages of the Universe end with the formation of the first generation of stars residing in primeval galaxies. These objects were the first to produce...