7 citations · 10 across the 13 of their papers we have counts for
14 papers
A Multiwavelength View of Oph II: Disentangling the Variability of the Multi-Star Component C
Sean J. Gunderson, Walter W. Golay, Jackson Codd +8
We present a multiwavelength analysis of the star Oph C, covering X-ray, optical, near-infrared, and radio observations to test for the presence of interferometrically-detected…
Signatures in the local interstellar medium of electromagnetic radiation produced by neutron star gravitational waves
Preston Jones, Pragati Pradhan, Douglas Singleton
The Voyager spacecraft have been detecting plasma oscillations of a few kHz for over 40 years. However, there is still no widely accepted hypothesis for the astrophysical source of…
Energy shift of Fe-K fluorescence lines due to low ionization demonstrated with XRISM in Centaurus X-3
Yutaro Nagai, Teruaki Enoto, Masahiro Tsujimoto +13
The Fe K fluorescence line at 6.4 keV is a powerful probe of cold matter surrounding X-ray sources and has been widely used in various astrophysical contexts. The X-ray microcal…
Chandra/HETG and NuSTAR Observations of V750 Ara, a Cas-type Star
David P. Huenemoerder, Sean J. Gunderson, Richard Ignace +6
We present 197 ks HETG and 95 ks NuSTAR spectra of the Cas-type object V750 Ara. The high-resolution X-ray spectra show that the target is similar to other objects of this cla…
X-ray Polarimetry of Accreting White Dwarfs: A Case Study of EX Hydrae
Sean J. Gunderson, Swati Ravi, Herman L. Marshall +5
We present the first first X-ray polarization measurements of a white dwarf, the intermediate polar EX Hya. We measured significant polarization only in the 2 -- 3 keV energy band…
A Multiwavelength View of Oph I: Resolving the X-ray Source Between A and B
Sean J. Gunderson, Jackson Codd, Walter W. Golay +12
We present a multiwavelength analysis of the central stellar pair of Oph, components A and B. Using recent high-resolution \textit{Chandra X-ray Observatory} observations, we d…
Benchmark of the Fe XXV R ratio in photoionized plasma during eclipse of Centaurus X-3 with XRISM/Resolve
Yuto Mochizuki, Masahiro Tsujimoto, Maurice A. Leutenegger +6
The R ratio is a useful diagnostic of the X-ray emitting astrophysical plasmas defined as the intensity ratio of the forbidden over the inter-combination lines in the K line com…
Carbon-rich dust injected into the interstellar medium by Galactic WC binaries survives for hundreds of years
Noel D. Richardson, Micaela Henson, Emma P. Lieb +23
Some carbon-rich Wolf-Rayet stars (WC stars) show an infrared excess from dust emission. Dust forms in the collision of the WC wind with a companion star's wind. As this dust is ca…
Outflowing photoionized plasma in Circinus X-1 using the high-resolution X-ray spectrometer Resolve onboard XRISM and the radiative transfer code cloudy
Masahiro Tsujimoto, Teruaki Enoto, María Díaz Trigo +8
High-resolution X-ray spectroscopy is a key to understanding the mass inflow and outflow of compact objects. Spectral lines carry information about the ionization, density, and vel…
A Time-Dependent Spectral Analysis of Cassiopeiae
Sean J. Gunderson, David P. Huenemoerder, José M. Torrejón +7
We investigated the temporal and spectral features of Cassiopeiae's X-ray emission within the context of the white dwarf accretion hypothesis. We find that the variabilities pr…
Chandra HETG X-ray Spectra and Variability of Aqr, a Cas-type Be star
David P. Huenemoerder, Pragati Pradhan, Claude R. Canizares +7
High-resolution X-ray spectra of Aqr, a Cas-type star, obtained with the Chandra/HETG grating spectrometer, revealed emission lines of H-like ions of Mg, Si, S, and Fe, a…
Observed epochal variations in X-ray lines from the O Supergiant Puppis do not require substantial changes in the wind mass flux
Sean J. Gunderson, Kenneth G. Gayley, David P. Huenemoerder +2
We fit the high resolution \textit{Chandra} X-ray spectra of the O supergiant Puppis using the variable boundary condition (VBC) line model to test the stability of its mass-lo…
Prospects for Time-Domain and Multi-Messenger Science with AXIS
The AXIS Time-Domain, Multi-Messenger Science Working Group, : +19
The Advanced X-ray Imaging Satellite (AXIS) promises revolutionary science in the X-ray and multi-messenger time domain. AXIS will leverage excellent spatial resolution (<1.5 arcse…
Signatures of electromagnetic and sound radiation produced by gravitational waves in core-collapse supernovae
Preston Jones, Douglas Singleton, Pragati Pradhan
This paper presents the scenario that gravitational waves, generated in core-collapse of a pre-supernova star, can produce both electromagnetic radiation and sound radiation as gra…