Search Publications
Resonant conversion of gravitational waves in neutron star magnetospheres
McDonald, Jamie I.; Ellis, Sebastian A. R.
High-frequency gravitational waves are the subject of rapidly growing interest in the theoretical and experimental community. In this work we calculate the resonant conversion of gravitational waves into photons in the magnetospheres of neutron stars via the inverse Gertsenshtein mechanism. The resonance occurs in regions where the vacuum birefrin…
Fast Outflow in the Host Galaxy of the Luminous z = 7.5 Quasar J1007+2115
Shen, Yue; Fan, Xiaohui; Li, Mingyu +24 more
The James Webb Space Telescope opens a new window to directly probe luminous quasars powered by billion solar mass black holes in the Epoch of Reionization and their coevolution with massive galaxies with unprecedented details. In this paper, we report the first results from a deep NIRSpec integral field unit spectroscopic study of a quasar at z =…
Low-mass Galaxy Interactions Trigger Black Hole Activity
Nair, Preethi; Irwin, Jimmy A.; Mićić, Marko +3 more
The existence of high-z overmassive supermassive black holes represents a major conundrum in our understanding of black hole evolution. In this Letter, we probe from the observational point of view how early Universe environmental conditions could have acted as an evolutionary mechanism for the accelerated growth of the first black holes. Under th…
Parallel Diffusion Coefficient of Energetic Charged Particles in the Inner Heliosphere from the Turbulent Magnetic Fields Measured by Parker Solar Probe
Klein, Kristopher G.; Chen, Xiaohang; Giacalone, Joe +1 more
Diffusion coefficients of energetic charged particles in turbulent magnetic fields are a fundamental aspect of diffusive transport theory but remain incompletely understood. In this work, we use quasi-linear theory to evaluate the spatial variation of the parallel diffusion coefficient κ ∥ from the measured magnetic turbulence power spe…
Tracing the Origins of Mass Segregation in M35: Evidence for Primordially Segregated Binaries
von Hippel, Ted; Motherway, Erin; Geller, Aaron M. +2 more
M35 is a young open cluster and home to an extensive binary population. Using Gaia Data Release 3, Pan-STARRS, and Two Micron All Sky Survey photometry with the Bayesian statistical software, BASE-9, we derive precise cluster parameters, identify single and binary cluster members, and extract their masses. We identify 571 binaries down to Gaia G =…
The Effect of Starspots on Spectroscopic Age and Mass Estimates of Nonaccreting T Tauri Stars in the Taurus–Auriga Star-forming Region
Hillenbrand, Lynne A.; Markham, Madison; Bary, Jeffrey S. +1 more
Accurate age and mass determinations for young pre-main-sequence stars are made challenging by the presence of large-scale starspots. We present results from a near-infrared spectroscopic survey of 10 T-Tauri Stars in Taurus-Auriga that characterize spot-filling factors and temperatures, the resulting effects on temperature and luminosity determin…
Unveiling the 3D structure of nova shells with MUSE: The case of RR Pic
Schmidtobreick, L.; Celedón, L.; Tappert, C. +1 more
Context. Nova eruptions occur in cataclysmic variables when enough material has been accreted onto the surface of the white dwarf primary. As a consequence, the material that has been accumulated until then is expelled into the interstellar medium, forming an expanding nova shell around the system. Understanding the physical process that shapes th…
Simultaneous retrieval of orbital phase resolved JWST/MIRI emission spectra of the hot Jupiter WASP-43b: evidence of water, ammonia, and carbon monoxide
Irwin, Patrick G. J.; Bell, Taylor J.; Kreidberg, Laura +14 more
Spectroscopic phase curves of hot Jupiters measure their emission spectra at multiple orbital phases, thus enabling detailed characterization of their atmospheres. Precise constraints on the atmospheric composition of these exoplanets offer insights into their formation and evolution. We analyse four phase-resolved emission spectra of the hot Jupi…
Introducing the Condor Array Telescope - III. The expansion and age of the shell of the dwarf nova Z Camelopardalis, and detection of a second, larger shell
Zurek, David R.; Walter, Frederick M.; Rich, R. Michael +7 more
The existence of a vast nova shell surrounding the prototypical dwarf nova Z Camelopardalis (Z Cam) proves that some old novae undergo metamorphosis to appear as dwarf novae thousands of years after a nova eruption. The expansion rates of ancient nova shells offer a way to constrain both the time between nova eruptions and the time for post-nova m…
The AstraLux-TESS high spatial resolution imaging survey. Search for stellar companions of 215 planet candidates from TESS
Montesinos, B.; Mendigutía, I.; Huélamo, N. +6 more
Context. Chance-aligned sources or blended companions can cause false positives in planetary transit detections or simply bias the determination of the candidate properties. In the era of high-precision space-based photometers, the need for high spatial resolution images has been demonstrated to be critical for validating and confirming transit si…