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The Novel Obscured State of Stellar-mass Black Hole GRS 1915+105
Mayura Balakrishnan, J. M. Miller, M. T. Reynolds +3
GRS 1915105 is a stellar-mass black hole that is well known for exhibiting at least 12 distinct classes of X-ray variability and correlated multi-wavelength behavior. Despite su…
A Redshifted Inner Disk Atmosphere and Transient Absorbers in the Ultra-Compact Neutron Star X-ray Binary 4U 1916-053
Nicolas Trueba, J. M. Miller, A. C. Fabian +8
The very small accretion disks in ultra-compact X-ray binaries (UCXBs) are special laboratories in which to study disk accretion and outflows. We report on three sets of new (250 k…
An Obscured, Seyfert-2-like State of the Stellar-mass Black Hole GRS 1915+105 Caused by Failed Disk Winds
J. M. Miller, A. Zoghbi, J. Raymond +13
We report on Chandra gratings spectra of the stellar-mass black hole GRS 1915+105 obtained during a novel, highly obscured state. As the source entered this state, a dense, massive…
A New Spin on an Old Black Hole: NuSTAR Spectroscopy of EXO 1846-031
Paul A. Draghis, Jon M. Miller, Edward M. Cackett +4
The black hole candidate EXO 1846-031 underwent an outburst in 2019, after at least 25 years in quiescence. We observed the system using \textit{NuSTAR} on August 3rd, 2019. The 3-…
Swift Spectroscopy of the Accretion Disk Wind in the Black Hole GRO J1655-40
M. Balakrishnan, J. M. Miller, N. Trueba +6
Chandra obtained two High Energy Transmission Grating (HETG) spectra of the stellar-mass black hole GRO J1655-40 during its 2005 outburst, revealing a rich and complex disk wind. S…
Variable Accretion onto Protoplanet Host Star PDS 70
Thanawuth Thanathibodee, Brandon Molina, Nuria Calvet +6
The PDS 70 system has been subject to many studies in the past year following the discovery of two accreting planets in the gap of its circumstellar disk. Nevertheless, the mass ac…