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Accurate and Model-independent Radius Determination of Single FGK and M Dwarfs Using Gaia DR3 Data
Kiman, Rocio; Faherty, Jacqueline K.; Brandt, Timothy D. +1 more
Measuring fundamental stellar parameters is key to fully comprehending the evolution of stars. However, current theoretical models overpredict effective temperatures, and underpredict radii, compared to observations of K and M dwarfs (radius inflation problem). In this work, we have developed a model-independent method to infer precise radii of si…
KMT-2023-BLG-2669: Ninth Free-floating Planet Candidate with θ E Measurements
Han, Cheongho; Lee, Chung-Uk; Zang, Weicheng +17 more
We report a free-floating planet (FFP) candidate identified from the analysis of the microlensing event KMT-2023-BLG-2669. The lensing light curve is characterized by a short duration (≲3 days) and a small amplitude (≲0.7 mag). From the analysis, we find an Einstein timescale of t E ⋍ 0.33 days and an Einstein radius of θ E ⋍…
Properties of the gas escaping from a non-isothermal porous dust surface layer of a comet
Mottola, S.; Küppers, M.; Thomas, N. +6 more
Estimation of the properties of the sublimation products leaving the cometary nucleus is one of the significant questions in the study of the dusty-gas flow following the Rosetta mission. It is widely assumed that the temperature of the water molecules emitted is the temperature of ice directly exposed to the surface. However, it is the simplest n…
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…