The Low-Mass Baryon Cycle in QUEST Dwarf Galaxies I: Sample definition and first results

Posted by klaurent Chicago

Kavli Affiliate: Hsiaowen Chen |Summary:We introduce the QUEST Dwarfs program, which connects low-mass galaxies’ stellar populations, interstellar medium, and circumgalactic medium in a large and coherently analyzed sample using a combination of optical spectroscopy, broadband imaging, and FUV absorption spectra of bright background sources .We present initial results from the first-release sample, comprising 14 galaxies […]


Continue.. The Low-Mass Baryon Cycle in QUEST Dwarf Galaxies I: Sample definition and first results

Energy Partitioning in Dust-catalyzed $mathrmH_2$ and HD Formation Revealed by Molecular Simulations Considering Nuclear Quantum Effects

Posted by klaurent Peking

Kavli Affiliate: Lile Wang |Summary:Molecular hydrogen formation on interstellar dust grains is a key surface process in the interstellar medium, but the redistribution of the recombination energy between the substrate and the nascent molecule remains poorly understood. Here, we use ring-polymer molecular dynamics (RPMD) with a machine-learning force field to investigate energy partitioning during $mathrmH_2$ […]


Continue.. Energy Partitioning in Dust-catalyzed $mathrmH_2$ and HD Formation Revealed by Molecular Simulations Considering Nuclear Quantum Effects

SMA Observations Reveal Abundant HNC Chemistry in Transition Disks

Posted by klaurent Peking

Kavli Affiliate: Feng Long| Summary: The physical and chemical conditions of protoplanetary disks shape the properties of nascent planetary systems. The line ratios and relative abundances of the HCN-HNC isomer pair are well-suited for tracing these gas conditions, since isomer chemistry is linked to the underlying temperature, elemental abundances, and irradiation environment of the emitting […]


Continue.. SMA Observations Reveal Abundant HNC Chemistry in Transition Disks

Kratos-linerad: GPU-accelerated Monte Carlo radiative transfer of lines with efficient imaging

Posted by klaurent Peking

Kavli Affiliate: Lile Wang |Summary:Spectral lines encode the velocity, the temperature, and the chemical structure of astrophysical gas; interpreting them requires radiative transfer that is accurate at high optical depth, consistent with the local excitation, and efficient enough to synthesize velocity-resolved images. We present Kratos-linerad, a GPU-accelerated Monte Carlo radiative transfer code for spectral lines. […]


Continue.. Kratos-linerad: GPU-accelerated Monte Carlo radiative transfer of lines with efficient imaging

Kratos-linerad: GPU-accelerated Monte Carlo radiative transfer of lines with efficient imaging

Posted by klaurent Peking

Kavli Affiliate: Lile Wang |Summary:Spectral lines encode the velocity, the temperature, and the chemical structure of astrophysical gas; interpreting them requires radiative transfer that is accurate at high optical depth, consistent with the local excitation, and efficient enough to synthesize velocity-resolved images. We present Kratos-linerad, a GPU-accelerated Monte Carlo radiative transfer code for spectral lines. […]


Continue.. Kratos-linerad: GPU-accelerated Monte Carlo radiative transfer of lines with efficient imaging

Factor-Adjusted Location Tests for High-Dimensional Time Series

Posted by klaurent Peking

Kavli Affiliate: Feng Long| Summary: We study high-dimensional one-sample mean testing for time series with strong common serial dependence driven by latent dynamic factors. After estimating the dynamic factor loading space from lagged autocovariance, we project the data onto its orthogonal complement and construct three factor-adjusted tests: a max test for sparse alternatives, a quadratic […]


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HST imaging, pipeline modeling, and time-delay predictions of 2 triply-imaged and 15 quadruply-imaged lensed quasars

Posted by klaurent Cambridge, This Week: Astrophysics

Kavli Affiliate: R. G. McMahon | Summary:The Hubble-Lemaître tension remains a significant challenge in modern cosmology, exhibiting a discrepancy between early-Universe cosmic microwave background measurements and local distance ladder observations. Strong lensing time-delay cosmography provides an independent, geometric probe of $H_0$ that can help resolve this discrepancy. Although hundreds of lensed quasars have been discovered, […]


Continue.. HST imaging, pipeline modeling, and time-delay predictions of 2 triply-imaged and 15 quadruply-imaged lensed quasars

The JWST Early Release Science Program for Direct Observations of Exoplanetary Systems VIII: patchy forsterite and enstatite clouds in the atmosphere of VHS 1256 b, retrieval lessons learned and outlook to the future

Posted by klaurent Stanford, This Week: Astrophysics

Kavli Affiliate: Bruce Macintosh | Summary:JWST defines a new era for the data-driven approach of retrieval modelling, which has become a cornerstone tool for the statistical inference of exoplanetary and brown dwarf properties. The Early Release Science program #1386 observations of VHS 1256 b represent a huge jump in data quality, data quantity and spectral […]


Continue.. The JWST Early Release Science Program for Direct Observations of Exoplanetary Systems VIII: patchy forsterite and enstatite clouds in the atmosphere of VHS 1256 b, retrieval lessons learned and outlook to the future