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X-Rays from RS Ophiuchi's 2021 Eruption: Shocks In and Out of Ionization Equilibrium
Sokoloski, J. L.; Mukai, Koji; Islam, Nazma
The recurrent nova RS Ophiuchi (RS Oph) underwent its most recent eruption on 2021 August 8 and became the first nova to produce both detectable GeV and TeV emission. We used extensive X-ray monitoring with the Neutron Star Interior Composition Explorer Mission (NICER) to model the X-ray spectrum and probe the shock conditions throughout the 2021 …
The Atmosphere of HD 149026b: Low Metal Enrichment and Weak Energy Transport
Fortney, Jonathan J.; Batalha, Natasha E.; Mukherjee, Sagnick +1 more
Recent JWST eclipse spectra of the high-density hot Saturn HD 149026b between 2.35 and 5.08 µm have allowed for in-depth study of its atmosphere. To understand its atmospheric properties, we have created a grid of 1D radiative-convective–thermochemical–equilibrium atmosphere models and spectra with PICASO 3.0. In agreement with previous work…
Kinematic origin of white dwarfs in the solar neighborhood
Raddi, Roberto; Torres, Santiago; Zubiaur, Ainhoa
Context. White dwarfs are considered to be efficient cosmochronometers. Thanks to the recent space-borne mission Gaia, a nearly complete sample up to about 100 parsecs from the Sun has been compiled. However, the Galaxy, as a dynamic system, implies that these objects may have very diverse origins. It is therefore of paramount importance to charac…
Synthetic Gaia DR3 Surveys from the FIRE Cosmological Simulations of Milky Way-mass Galaxies
Sanderson, Robyn; Wetzel, Andrew; Necib, Lina +4 more
The third data release (DR3) of Gaia has provided a fivefold increase in the number of radial velocity measurements of stars, as well as a stark improvement in parallax and proper motion measurements. To help with studies that seek to test models and interpret Gaia DR3, we present nine Gaia synthetic surveys, based on three solar positions in thre…
Protosolar D-to-H Abundance and One Part per Billion PH3 in the Coldest Brown Dwarf
Fortney, Jonathan J.; Apai, Dániel; Marley, Mark +24 more
The coldest Y spectral type brown dwarfs are similar in mass and temperature to cool and warm (∼200–400 K) giant exoplanets. We can therefore use their atmospheres as proxies for planetary atmospheres, testing our understanding of physics and chemistry for these complex, cool worlds. At these cold temperatures, their atmospheres are cold enough fo…
eDIG-CHANGES. II. Project Design and Initial Results on NGC 3556
Bregman, Joel N.; Li, Hui; Martini, Paul +19 more
The extraplanar diffuse ionized gas (eDIG) represents ionized gases traced by optical/UV lines beyond the stellar extent of galaxies. We herein introduce a novel multislit narrow-band spectroscopy method to conduct spatially resolved spectroscopy of the eDIG around a sample of nearby edge-on disk galaxies (eDIG-CHANGES). In this paper, we introduc…
Methodological refinement of the submillimeter galaxy magnification bias. II. Cosmological analysis with tomography
Bonavera, L.; González-Nuevo, J.; Cueli, M. M. +2 more
Context. This work focuses on the submillimeter galaxy magnification bias, specifically in the tomographic scenario. It builds upon previous works, while utilising updated data to refine the methodology employed in constraining the free parameters of the halo occupation distribution model and cosmological parameters within a flat ΛCDM model.
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Hubble tension in a nonminimally coupled curvature-matter gravity model
Bertolami, Orfeu; Barroso Varela, Miguel
The presently open problem of the Hubble tension is shown to be removed in the context of a modified theory of gravity with a non-minimal coupling between curvature and matter. By evolving the cosmological parameters that match the cosmic microwave background data until their values from direct late-time measurements, we obtain an agreement betwee…
Kinematics of Supernova Remnants Using Multiepoch Maximum Likelihood Estimation: Chandra Observation of Cassiopeia A as an Example
Sato, Toshiki; Yamada, Shinya; Sakai, Yusuke +2 more
Decadal changes in a nearby supernova remnant (SNR) were analyzed using a multiepoch maximum likelihood estimation (MLE) approach. To achieve greater accuracy in capturing the dynamics of SNRs, kinematic features and point-spread function effects were integrated into the MLE framework. Using Cassiopeia A as a representative example, data obtained …
TIC 184 743 498: the first tri-axial stellar pulsator
Jayaraman, Rahul; Handler, Gerald; Rappaport, Saul +4 more
We have discovered a δ Scuti pulsator in a tight binary (P = 1.053 d) with nine pulsation modes whose frequencies are between 38 and 56 d-1. Each of these modes exhibits amplitude modulations and π-rad phase shifts twice per orbital cycle. Five of these modes exhibit amplitude and phase shifts that are readily explained by dipole pulsat…