Search Publications
Resolving Clumpy versus Extended Lyα in Strongly Lensed, High-redshift Lyα Emitters
Shibuya, Takatoshi; Florian, Michael; Sharon, Keren +10 more
We present six strongly gravitationally lensed Lyα emitters (LAEs) at z ∼ 4–5 with Hubble Space Telescope (HST) narrowband imaging isolating Lyα. Through complex radiative transfer Lyα encodes information about the spatial distribution and kinematics of the neutral hydrogen upon which it scatters. We investigate the galaxy properties and Lyα morph…
Latitudinal Asymmetry in the Dayside Atmosphere of WASP-43b
Sing, David K.; Valenti, Jeff A.; Rustamkulov, Zafar +9 more
We present two-dimensional near-infrared temperature maps of the canonical hot Jupiter WASP-43b using a phase-curve observation with JWST NIRSpec/G395H. From the white-light planetary transit, we improve constraints on the planet's orbital parameters and measure a planet-to-star radius ratio of
Resolving Twin Jets and Twin Disks with JWST and ALMA: The Young WL 20 Multiple System
Le Gouellec, Valentin J. M.; Ressler, Michael E.; Tychoniec, Łukasz +2 more
We report the discovery of jets emanating from pre-main-sequence objects exclusively at mid-infrared wavelengths, enabled by the superb sensitivity of JWST's Mid-Infrared Instrument Medium-Resolution Spectrometer. These jets are observed only in lines of [Ni II], [Fe II], [Ar II], and [Ne II]. The H2 emission, imaged in eight distinct t…
The Origin of Young Stellar Populations in NGC 1783: Accretion of External Stars
Milone, Antonino P.; Wang, Li; Deng, Licai +4 more
The presence of young stellar populations in the Large Magellanic Cloud cluster NGC 1783 has caught significant attention, with suggestions ranging from it being a genuine secondary stellar generation to a population of blue straggler stars or simply contamination from background stars. Thanks to multiepoch observations with the Hubble Space Teles…
A High Incidence of Dusty Hα Emitters at z > 3 Among UltraVISTA Dropout Galaxies in COSMOS Revealed by JWST
Rinaldi, Pierluigi; Caputi, Karina I.; Ashby, Matthew L. N. +3 more
We have characterized 26 Spitzer/IRAC-selected sources from the SMUVS program that are undetected in the UltraVISTA DR5 H- and/or K s-band images, covering 94 arcmin2 of the COSMOS field, which have deep multiwavelength JWST photometry. We analyzed the JWST/NIRCam imaging from the PRIMER survey and ancillary HST data to revea…
Evidence for a Fast Soft X-Ray Wind in M82 from XMM-RGS
Boettcher, Erin; Hodges-Kluck, Edmund
Starburst wind models predict that metals and energy are primarily carried out of the disk by hot gas (T > 106 K), but the low energy resolution of X-ray CCD observations results in large uncertainties on the mass and energy loading. Here, we present evidence for a fast soft X-ray wind from the prototypical starburst galaxy M82 using…
Asteroseismic Inversions for Internal Sound Speed Profiles of Main-sequence Stars with Radiative Cores
Basu, Sarbani; Hekker, Saskia; Christensen-Dalsgaard, Jørgen +3 more
The theoretical oscillation frequencies of even the best asteroseismic models of solar-like oscillators show significant differences from observed oscillation frequencies. Structure inversions seek to use these frequency differences to infer the underlying differences in stellar structure. While used extensively to study the Sun, structure inversi…
Chandra X-Ray Observatory Observations of 13 Fermi LAT Sources
Kargaltsev, Oleg; Yang, Hui; Hare, Jeremy +3 more
In the latest data release from the Fermi Gamma-ray Space Telescope (the 4th Fermi LAT 14 yr Catalog, or 4FGL), more than 50% of the Galactic sources are yet to be identified. We observed 13 unidentified Fermi LAT sources with the Chandra X-Ray Observatory to explore their nature. We report the results of the classification of X-ray sources in the…
Generalized Rotation Curves of the Milky Way from the GAIA DR3 Data Set: Constraints on Mass Models
Sylos Labini, Francesco
The circular velocity curve traced by stars provides a direct means of investigating the potential and mass distribution of the Milky Way. Recent measurements of the Galaxy's rotation curve have revealed a significant decrease in velocity for Galactic radii larger than approximately 15 kpc. While these determinations have primarily focused on the …
Atmospheric Retrievals of the Phase-resolved Spectra of Irradiated Brown Dwarfs WD-0137B and EPIC-2122B
Lothringer, Joshua D.; Apai, Dániel; Parmentier, Vivien +3 more
We present an atmospheric retrieval analysis of Hubble Space Telescope/Wide Field Camera 3/G141 spectroscopic phase curve observations of two brown dwarfs, WD-0137B and EPIC-2122B, in ultrashort period orbits around white dwarf hosts. These systems are analogous to hot and ultra-hot Jupiter systems, enabling a unique and high-precision comparison …