Search Publications
Review and outlook of solar energetic particle measurements on multispacecraft missions
Reames, Donald V.
The earliest evidence of spatial distributions of solar energetic particles (SEPs) compared events from many different source longitudes on the Sun, but the early Pioneers provided the first evidence of the large areas of equal SEP intensities across the magnetically confined "reservoirs" late in the events. More detailed measurements of the impor…
High-energy (>40 MeV) Proton Intensity Enhancements Associated with the Passage of Interplanetary Shocks at 1 au
Lario, D.; Richardson, I. G.; Aran, A. +1 more
We analyze periods with elevated >40 MeV proton intensities observed near Earth over a time span of 43 yr (1973-2016) that coincide with the passage of interplanetary (IP) shocks. Typically, elevated proton intensities result from large solar energetic particle (SEP) events. The IP shocks observed during these elevated-intensity periods may or …
Spectral Retrieval with JWST Photometric data: a Case Study for HIP 65426 b
Wang, Ji
Half of the JWST high-contrast imaging objects will only have photometric data as of Cycle 2. However, to better understand their atmospheric chemistry that informs formation origin, spectroscopic data are preferred. Using HIP 65426 b, we investigate to what extent planet properties and atmospheric chemical abundance can be retrieved with only JWS…
Recurrent Symbiotic Nova T Coronae Borealis before Outburst
Strakhov, I. A.; Tatarnikov, A. M.; Shenavrin, V. I. +5 more
The results of photometric and spectral observations of T CrB obtained in a wide range of wavelengths in 2011-2023 are presented. We use the near-IR light curves to determine a new ephemeris $JD_{\textrm{min}}=2455828.9+227.55E$ for the times of light minima when the red giant is located between the observer and the hot component. The flux ratio H…
A constrained cosmological model in f(R ,Lm) gravity
Singh, J. K.; Shaily; Myrzakulov, Ratbay +1 more
In this article, we study the expanding nature of the universe in the context of f(R ,Lm) gravity theory, here R represents the Ricci scalar and Lm is the matter Lagrangian density. With a specific form of f(R ,Lm) , we obtain the field equations for flat FLRW metric. We parametrize the deceleration parameter in te…
Age of FGK Dwarfs Observed with LAMOST and GALAH: Considering the Oxygen Enhancement
Bird, Sarah A.; Wu, Yaqian; Bi, Shaolan +11 more
Varying oxygen abundance could impact modeling-inferred ages. This work aims to estimate the ages of dwarfs considering observed oxygen abundance. To characterize 67,503 LAMOST and 4006 GALAH FGK-type dwarf stars, we construct a grid of stellar models, which take into account oxygen abundance as an independent model input. Compared with ages deter…
MeV Gamma-Ray Source Contribution to the Inner Galactic Diffuse Emission
Mukherjee, Reshmi; Yoneda, Hiroki; Inoue, Yoshiyuki +2 more
The origin of the inner Galactic emission, measured by COMPTEL with a flux of ~10-2 MeV cm-2 s-1 sr-1 in the 1-30 MeV energy range from the inner Galactic region, has remained unsettled since its discovery. In this paper, we elaborate on a model of individual MeV gamma-ray sources unresolved by COMPTEL. …
Globular cluster ultraluminous X-ray sources in the furthest early-type galaxies
Kundu, Arunav; Dage, Kristen C.; Zepf, Stephen E. +5 more
Ultraluminous X-ray sources (ULXs) in globular clusters (GCs) are low-mass X-ray binaries that achieve high X-ray luminosities through a currently uncertain accretion mechanism. Using archival Chandra and Hubble Space Telescope observations, we perform a volume-limited search (≲70 Mpc) of 21 of the most massive ($\gt 10^{11.5} \, \mathrm{M}_\odot$…
Search for Ultralight Dark Matter with a Frequency Adjustable Diamagnetic Levitated Sensor
Zhang, Liang; Li, Rui; Lin, Shaochun +3 more
Among several dark matter candidates, bosonic ultra-light (sub-meV) dark matter is well motivated because it could couple to the Standard Model and induce new forces. Previous MICROSCOPE and Eöt-Wash torsion experiments have achieved high accuracy in the sub-1 Hz region. However, at higher frequencies there is still a lack of relevant experimental…
An Independent Determination of the Distance to Supernova SN 1987A by Means of the Light Echo AT 2019xis
Baade, Dietrich; Wang, Lifan; Höflich, Peter +5 more
Accurate distance determination to astrophysical objects is essential for the understanding of their intrinsic brightness and size. The distance to SN 1987A has been previously measured by the expanding photosphere method and by using the angular size of the circumstellar rings with absolute sizes derived from light curves of narrow UV emission li…