Search Publications
Magnetic Field Alignment Relative to Multiple Tracers in the High-mass Star-forming Region RCW 36
Fissel, Laura M.; Cunningham, Maria; Jones, Paul +9 more
We use polarization data from SOFIA HAWC+ to investigate the interplay between magnetic fields and stellar feedback in altering gas dynamics within the high-mass star-forming region RCW 36, located in Vela C. This region is of particular interest as it has a bipolar H II region powered by a massive star cluster, which may be impacting the surround…
Correlating Intrinsic Stellar Parameters with Mg II Self-reversal Depths
Peacock, Sarah; Redfield, Seth; Youngblood, Allison +2 more
The Mg II h&k emission lines (2803, 2796 Å) are a useful tool for understanding stellar chromospheres and transition regions due to their intrinsic brightness, relatively low interstellar medium (ISM) absorption interference, and abundance of archival spectra available. Similar to other optically thick chromospheric emission lines such as H I Lyα,…
Gone with the Molecular Wind: Photoevaporation in the Compact Dust Disk around CX Tau
Cleeves, L. Ilsedore; Williams, Jonathan P.; Pontoppidan, Klaus M. +5 more
We present Keck NIRSPEC+AO high-resolution (R ∼ 25,000), mid-infrared (M-band: 4.6–5.2 µm) spectra of the protoplanetary disk CX Tau. CX Tau provides an ideal laboratory to study inner disk chemistry in a disk where the signs of radial drift of pebbles are present in the form of a compact mm dust disk and extended gas disk. Our data covers m…
Turbulent Pressure Heats Gas and Suppresses Star Formation in Galactic Bar Molecular Clouds
Meier, David S.; Ginsburg, Adam; Klessen, Ralf S. +6 more
The Central Molecular Zone (CMZ) of the Milky Way is fed by gas inflows from the Galactic disk along almost radial trajectories aligned with the major axis of the Galactic bar. However, despite being fundamental to all processes in the nucleus of the Galaxy, these inflows have been studied significantly less than the CMZ itself. We present observa…
Simultaneous Far-ultraviolet and Near-ultraviolet Observations of T Tauri Stars with UVIT/AstroSat: Probing the Accretion Process in Young Stars
Gorti, Uma; Manoj, P.; Narang, Mayank +4 more
We present results from simultaneous far-ultraviolet (FUV) and near-ultraviolet (NUV) observations of T Tauri stars (TTSs) in the Taurus molecular cloud with UVIT/AstroSat. This is the very first UVIT study of TTSs. From the spectral energy distribution of TTSs from FUV to IR, we show that classical TTSs (CTTSs) emit significantly higher UV excess…
Revealing Potential Initial Mass Function Variations with Metallicity: JWST Observations of Young Open Clusters in a Low-metallicity Environment
Kobayashi, Naoto; Lau, Ryan M.; Izumi, Natsuko +3 more
We present the substellar mass function of star-forming clusters (≃0.1 Myr old) in a low-metallicity environment (≃‑0.7 dex). We performed deep JWST/NIRCam and MIRI imaging of two star-forming clusters in Digel Cloud 2, a star-forming region in the outer Galaxy (R G ≳ 15 kpc). The very high sensitivity and spatial resolution of JWST e…
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…