Search Publications
Tomographic Imaging of the Sagittarius Spiral Arm's Magnetic Field Structure
Bastien, Pierre; Coudé, Simon; Hasegawa, Tetsuo +16 more
The Galactic global magnetic field is thought to play a vital role in shaping Galactic structures such as spiral arms and giant molecular clouds. However, our knowledge of magnetic field structures in the Galactic plane at different distances is limited, as measurements used to map the magnetic field are the integrated effect along the line of sig…
Investigating the Drivers of Electron Temperature Variations in H II Regions with Keck-KCWI and VLT-MUSE
Sandstrom, Karin M.; Glover, Simon C. O.; Klessen, Ralf S. +12 more
H II region electron temperatures are a critical ingredient in metallicity determinations, and recent observations have revealed systematic variations in the temperatures measured using different ions. We present electron temperatures (T e ) measured using the optical auroral lines ([N II]λ5756, [O II]λ λ7320, 7330, [S II]λ λ4069, 4076…
Exploring the Gas-phase Metallicity Gradients of Star-forming Galaxies at Cosmic Noon
Cleri, Nikko J.; Giavalisco, Mauro; Ji, Zhiyuan +3 more
We explore the relationships between the [O/H] gas-phase metallicity radial gradients and multiple galaxy properties for 238 star-forming galaxies at 0.6 < z < 2.6 selected from the CANDELS Lyα Emission at Reionization survey with stellar mass $8.5\lt \mathrm{log}\,{M}_{* }/{M}_{\odot }\lt 10.5$ . The gradients cover the range from ‑0.11 to …
The Massive and Distant Clusters of WISE Survey 2: Equatorial First Data Release
Connor, Thomas; Gonzalez, Anthony H.; Stanford, S. A. +7 more
The Massive and Distant Clusters of WISE Survey 2 (MaDCoWS2) is a new survey designed as the successor of the original MaDCoWS survey. MaDCoWS2 improves upon its predecessor by using deeper optical and infrared data and a more powerful detection algorithm (PZWav). As input to the search, we use grz photometry from the DECam Legacy Survey (DECaLS) …
Localizing Quasiperiodic Pulsations in Hard X-Ray, Microwave, and Lyα Emissions of an X6.4 Flare
Su, Yang; Li, Dong; Hong, Zhenxiang +1 more
We report the simultaneous observations of quasiperiodic pulsations (QPPs) in wavelengths of hard X-ray (HXR), microwave, Lyα, and ultraviolet (UV) emissions during the impulsive phase of an X6.4 flare on 2024 February 22 (SOL2024-02-22T22:08). The X6.4 flare shows three repetitive and successive pulsations in HXR and microwave wavebands, and they…
Imprints of the Local Bubble and Dust Complexity on Polarized Dust Emission
Tahani, Mehrnoosh; Clark, S. E.; Halal, George
Using 3D dust maps and Planck polarized dust emission data, we investigate the influence of the 3D geometry of the nearby interstellar medium (ISM) on the statistics of the dust polarization on large (
Measuring Tracers of Planet Formation in the Atmosphere of WASP-77A b: Substellar O/H and C/H Ratios, with a Stellar C/O Ratio and a Potentially Superstellar Ti/H Ratio
Changeat, Quentin; Edwards, Billy
We present a comprehensive atmospheric retrieval study of the hot Jupiter WASP-77A b using eclipse observations from the Hubble Space Telescope (HST) and JWST. Using atmospheric retrievals, the spectral features of H2O, CO, and TiO are identified, with volume mixing ratios estimated at log10(VMR) = ‑4.40 ${}_{-0.11}^{+0.14}$ …
A Test of Spectroscopic Age Estimates of White Dwarfs Using Wide WD+WD Binaries
Hermes, J. J.; van Saders, Jennifer L.; Tremblay, P. -E. +4 more
White dwarf stars have been used for decades as precise and accurate age indicators. This work presents a test of the reliability of white dwarf total ages when spectroscopic observations are available. We conduct follow-up spectroscopy of 148 individual white dwarfs in widely separated double-white-dwarf (WD+WD) binaries. We supplement the sample…
Single-star Warm-Jupiter Systems Tend to Be Aligned, Even around Hot Stellar Hosts: No T eff–λ Dependency
Butler, R. Paul; Quinn, Samuel N.; Rice, Malena +22 more
The stellar obliquity distribution of warm-Jupiter systems is crucial for constraining the dynamical history of Jovian exoplanets, as the warm Jupiters' tidal detachment likely preserves their primordial obliquity. However, the sample size of warm-Jupiter systems with measured stellar obliquities has historically been limited compared to that of h…
Automated Chemical Reaction Network Generation and Its Application to Exoplanet Atmospheres
Yang, Jeehyun; Hu, Renyu
With the advent of JWST and the spectroscopic characterization of exoplanet atmospheres in unprecedented detail, there is a demand for more complete pictures of chemical and photochemical reactions and their impacts on atmospheric composition. Traditionally, building reaction networks for (exo)planetary atmospheres involves manually tracking relev…