Laboratory Characterization of a Ge-CCD Prototype for Future Near-Infrared Astronomical Instrumentation

Kavli Affiliate: Sven Herrmann | Summary:Germanium charge-coupled devices (Ge-CCDs) extend CCD imaging beyond the silicon cutoff and are candidate detectors for the near-infrared channel of future astronomical instruments, in particular the spectrographs of next-generation wide-field surveys. We report the laboratory characterization at Brookhaven National Laboratory (BNL) of a prototype fabricated at MIT Lincoln Laboratory. We […]


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The LSST Science Pipelines Software: Optical Survey Pipeline Reduction and Analysis Environment

Kavli Affiliate: Eli Rykoff | Summary:The NSF-DOE Vera C. Rubin Observatory is executing the Legacy Survey of Space and Time (LSST) as its prime mission, producing a series of data releases over the ten-year survey. The LSST Science Pipelines Software will be used to create these data releases and to perform the nightly prompt processing […]


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A Sample of Thick-Disk Stars Hosting Hot Jupiters

Kavli Affiliate: Andrew Vanderburg | Summary:We present a homogeneous analysis of 268 confirmed and candidate transiting hot-Jupiter host stars with 4800K < Teff < 6200K. We combine high-resolution TRES spectra, Gaia, 2MASS and WISE photometry, and Gaia astrometry to determine these stars’ Teff, log g, Rstar, [alpha/Fe] and [Fe/H]. Based on their [alpha/Fe] and [Fe/H], […]


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Properties and limitations of linear models for mutual coupling in 21 cm arrays

Kavli Affiliate: Jacqueline Hewitt | Summary:Mutual coupling between elements of low-frequency arrays is a leading systematic for 21 cm cosmology, leaking bright foregrounds into otherwise clean regions of the power spectrum. Many mitigation models describe coupling as a linear combination of uncoupled signals re-radiated from neighboring feeds, but data suggest additional mechanisms. Inspired by antenna […]


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Probing fundamental physics with ALMA2040 mm-wavelength observations of neutron stars

Kavli Affiliate: Lijing Shao | Summary:Bursty or (rotation-induced) pulsed coherent radio emission from pulsars, magnetars, and fast radio transients originates in some of the most extreme environments in the Universe. However, the exact physical mechanism behind the scenes remains poorly understood. ALMA2040 will allow for systematic exploration of the millimeter-wavelength spectral window for pulsars and […]


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Testing the inelastic dark matter interpretation of the LZ event with heavy-element experiments

Kavli Affiliate: Peter Graham | Summary:We consider the inelastic dark matter interpretation of the recent 248 keV event observed by LZ and identify different experiments that could test it. Details of the underlying model and the ability of complementary experiments to test it depend significantly on the high-velocity tail of the dark matter distribution. We […]


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Disentangling geometry & growth in cosmic neutrino mass constraints: a more physical split and diagnostic

Kavli Affiliate: W. L. Kimmy Wu | Summary:Recent cosmological data hint at a neutrino mass sum below the minimum value allowed by the neutrino mass oscillation experiments, with a preference for the opposite of massive neutrinos ("negative" neutrino masses). Since massive neutrinos impact the expansion history of the Universe, which in turn modifies the growth […]


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An Attenuation Bump at z=9.3: Probing Dust Diversity at Cosmic Dawn

Kavli Affiliate: Kohei Inayoshi | Summary:We report the identification of a UV attenuation bump in the Black Pearl, a galaxy at a spectroscopic redshift of 9.3335 observed with JWST/NIRSpec as part of the ZENITH and EMBER surveys. This is the highest-redshift UV bump reported to date, probing dust properties only approximately 500 Myr after the […]


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Wandering intermediate-mass black holes and off-nuclear tidal disruption events from early star clusters

Kavli Affiliate: Mark Vogelsberger | Summary:Off-nuclear tidal disruption events (TDEs) reveal evidence for massive black holes outside galactic centers, but the origins of this wandering population remain uncertain. We investigate wandering intermediate-mass black holes (IMBHs) formed through runaway stellar collisions in dense, high-redshift star clusters and predict their TDE signatures across cosmic time. Our semi-analytic […]


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How Little Red Dots Turn Blue: Evolution of Kelvin-Helmholtz Contracting Black Hole Envelopes and Observational Diagnostics

Kavli Affiliate: Kohei Inayoshi | Summary:James Webb Space Telescope (JWST) observations have revealed compact, red-colored, broad-line emitters known as little red dots (LRDs), while a bluer counterpart population has been referred to as little blue dots (LBDs). Their physical connection remains unclear: they may represent different evolutionary stages of the same phenomenon, distinct populations, or […]


Continue.. How Little Red Dots Turn Blue: Evolution of Kelvin-Helmholtz Contracting Black Hole Envelopes and Observational Diagnostics