Beth A. Sargent

A Mid-infrared Spectroscopic Study of Young Stellar Objects in the SMC Region NGC 346: JWST Detects Dust, Accretion, Ices, and Outflows

Nolan Habel, Omnarayani Nayak, Patrick J Kavanagh, Olivia Jones et autres

Abstract We present mid-infrared spectroscopic observations of intermediate-to-high-mass young stellar objects (YSOs) in the low-metallicity star-forming region NGC 346 located within the Small Magellanic Cloud (SMC). We conduct these integral field unit observations with the Medium Resolution Spectroscopy mode of the Mid-Infrared …

Unraveling the Dusty Environment Around RT Vir

Michael D. Preston, A. K. Speck, Beth A. Sargent, Sean Dillon

Infrared studies of asymptotic giant branch (AGB) stars are critical to our understanding of the formation of cosmic dust. In this investigation, we explore the mid-to-far-infrared emission of oxygen rich AGB star RT Virginis. This optically thin dusty environment has unusual spectral …

The Empirical and Radiative Transfer Hybrid (EaRTH) Disk Model: Merging Analyses of Protoplanetary Dust Disk Mineralogy and Structure

William Grimble, Joel H. Kastner, C. Pinte, Beth A. Sargent et autres

Abstract Our understanding of how exoplanets form and evolve relies on analyses of both the mineralogy of protoplanetary disks and their detailed structures; however, these key complementary aspects of disks are usually studied separately. We present initial results from a hybrid model …

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Optical Properties of Aluminum Oxide Compared with Asymptotic Giant Branch Environments from Amorphous to Crystalline Structures

Rakibul A Shohan, Francisco Espinosa‐Magaña, Cody Cly, Raúl Borja‐Urby et autres

Although it is a minor component by mass, cosmic dust plays an outsized role in the universe, contributing to star and planet formation, stellar evolution, and molecule formation to name but a few [1-3]. Optical response is the main mechanism to determine …

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Thermal Evolution of Alumina through Dehydration of Aluminum Hydroxide

Cody Cly, Arturo Ponce, A. K. Speck, Alan Whittington et autres

Recent works suggest unexplained infrared features in some low-mass stars, known as Asymptotic Giant Branch (AGB) stars, are from two different polymorphs of aluminum oxide (Al2O3 or alumina), either amorphous or corundum (α-aluminum oxide) [1]. Aluminum oxides have been well studied in …

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Imaging of I Zw 18 by JWST

Giacomo Bortolini, Göran Östlin, Nolan Habel, Alec S. Hirschauer et autres

Context. The blue compact dwarf (BCD) galaxy I Zw 18 is one of the most metal-poor ( Z ∼ 3% Z ⊙ ) star-forming galaxies known in the local Universe. Since its discovery, the evolutionary status of this system has been at …

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Imaging of I Zw 18 by JWST: II. Spatially resolved star formation history

Giacomo Bortolini, Göran Östlin, Nolan Habel, Alec S. Hirschauer et autres

The blue compact dwarf galaxy I Zw 18 is one of the most metal-poor ($Z \sim 3% Z_{\sun}$) star-forming galaxies in the local Universe. Its evolutionary status has sparked debate within the astronomical community. We aim to investigate the stellar populations of …

JWST MIRI flight performance: The Medium-Resolution Spectrometer

Ioannis Argyriou, Alistair C. H. Glasse, David R. Law, Alvaro Labiano et autres

Context . The Medium-Resolution Spectrometer (MRS) provides one of the four operating modes of the Mid-Infrared Instrument (MIRI) on board the James Webb Space Telescope (JWST). The MRS is an integral field spectrometer, measuring the spatial and spectral distributions of light across …

The Mid-infrared Instrument for JWST and Its In-flight Performance

Gillian Wright, George H. Rieke, Alistair C. H. Glasse, Michael E. Ressler et autres

Abstract The Mid-Infrared Instrument (MIRI) extends the reach of the James Webb Space Telescope (JWST) to 28.5 μ m. It provides subarcsecond-resolution imaging, high sensitivity coronagraphy, and spectroscopy at resolutions of λ /Δ λ ∼ 100–3500, with the high-resolution mode employing an …

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JWST MIRI flight performance: The Medium-Resolution Spectrometer

Ioannis Argyriou, Alistair C. H. Glasse, David R. Law, Alvaro Labiano et autres

The Medium-Resolution Spectrometer (MRS) provides one of the four operating modes of the Mid-Infrared Instrument (MIRI) on board the James Webb Space Telescope (JWST). The MRS is an integral field spectrometer, measuring the spatial and spectral distributions of light across the 5-28 …