Search Publications
Joint Modelling of Dust Scattering and Thermal Emission: The Spider Complex
van Dokkum, Pieter; Abraham, Roberto; Merritt, Allison +4 more
Observations across the electromagnetic spectrum of radiative processes involving interstellar dust-emission, absorption, and scattering-are used to constrain the parameters of dust models and more directly to aid in foreground removal of dust for extragalactic and cosmological observations. Dust models can benefit from more independent constraint…
On the Hunt for the Origins of the Orphan-Chenab Stream: Detailed Element Abundances with APOGEE and Gaia
Laporte, Chervin F. P.; Price-Whelan, Adrian M.; Erkal, Denis +8 more
Stellar streams in the Galactic halo are useful probes of the assembly of galaxies like the Milky Way. Many tidal stellar streams that have been found in recent years are accompanied by a known progenitor globular cluster or dwarf galaxy. However, the Orphan-Chenab (OC) stream is one case where a relatively narrow stream of stars has been found wi…
An SMA Survey of Chemistry in Disks Around Herbig AeBe Stars
Wilner, David J.; Andrews, Sean M.; Huang, Jane +6 more
Protoplanetary disks around Herbig AeBe stars are exciting targets for studying the chemical environments where giant planets form. Save for a few disks, however, much of Herbig AeBe disk chemistry is an open frontier. We present a Submillimeter Array ~213-268 GHz pilot survey of millimeter continuum CO isotopologs and other small molecules in dis…
Mapping NGC 7027 in New Light: CO+ and HCO+ Emission Reveal Its Photon- and X-Ray-dominated Regions
Wilner, David J.; Montez, Rodolfo; Kastner, Joel H. +7 more
The young and well-studied planetary nebula (PN) NGC 7027 harbors significant molecular gas that is irradiated by luminous, pointlike UV (central star) and diffuse (shocked nebular) X-ray emission. This nebula represents an excellent subject to investigate the molecular chemistry and physical conditions within photon- and X-ray-dominated regions (…
The Luminosity Phase Space of Galactic and Extragalactic X-Ray Transients Out to Intermediate Redshifts
Esposito, Paolo; Auchettl, Katie; Vasilopoulos, Georgios +8 more
We present a detailed compilation and analysis of the X-ray phase space of low- to intermediate-redshift (0 ≤ z ≤ 1) transients that consolidates observed light curves (and theory where necessary) for a large variety of classes of transient/variable phenomena in the 0.3-10 keV energy band. We include gamma-ray burst afterglows, supernovae, superno…
Reconnection-generated Plasma Flows in the Quasi-separatrix Layer in Localized Solar Corona
Srivastava, Abhishek K.; Kayshap, Pradeep; Pontin, David I. +8 more
Multiwavelength observations of the propagating disturbances (PDs), discovered by Atmospheric Imaging Assembly (AIA) on board Solar Dynamics Observatory (SDO), are analyzed to determine their driving mechanism and physical nature. Two magnetic strands in the localized corona are observed to approach and merge with each other, followed by the gener…
Chemodynamical Analysis of Metal-rich High-eccentricity Stars in the Milky Way's Disk
Beers, Timothy C.; Lee, Young Sun; An, Deokkeun +2 more
We present a chemodynamical analysis of 11,562 metal-rich, high-eccentricity halo-like main-sequence stars, which have been referred to as the Splash or Splashed Disk, selected from the Sloan Digital Sky Survey and Large Sky Area Multi-Object Fiber Spectroscopic Telescope. When divided into two groups, a low-[α/Fe] population (LAP) and a high-[α/F…
JWST Detects Neon Line Variability in a Protoplanetary Disk
Muzerolle Page, J.; Walter, F. M.; McClure, M. K. +6 more
We report the first detection of variability in the mid-infrared neon line emission of a protoplanetary disk by comparing a JWST Mid-InfraRed Instrument Medium Resolution Spectrometer spectrum of SZ Cha taken in 2023 with a Spitzer Infrared Spectrograph Short-High spectrum of this object from 2008. We measure the [Ne III]-to-[Ne II] line flux rati…
Global Morphology Distortion of the 2021 October 9 Coronal Mass Ejection from an Ellipsoid to a Concave Shape
He, Jiansen; Shen, Fang; Feng, Xueshang +9 more
This paper presents a study of a 2021 October 9 coronal mass ejection (CME) with multipoint imaging and in situ observations. We also simulate this CME from the Sun to Earth with a passive tracer to tag the CME's motion. The coronagraphic images show that the CME is observed as a full halo by SOHO and as a partial halo by STEREO-A. The heliospheri…
Extended 3He-rich Time Periods Observed by Solar Orbiter: Magnetic Connectivity and Sources
Allen, R. C.; Ho, G. C.; Mason, G. M. +4 more
Observations of Solar Energetic Particles (SEPs) using the Suprathermal Ion Spectrograph (SIS), which is part of the Energetic Particle Detector suite on the Solar Orbiter mission, present an unprecedented opportunity to investigate the composition and evolution of SEPs in close proximity to the Sun. By analyzing data from the SIS instrument, we h…