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Upstream Plasma Waves and Downstream Magnetic Reconnection at a Reforming Quasi-parallel Shock
Yang, Zhongwei; Lu, Quanming; Gao, Xinliang +4 more
With the help of a two-dimensional particle-in-cell simulation model, we investigate the long-time evolution (near $100{{\rm{\Omega }}}_{i0}^{-1}$ , where Ω i0 is the ion gyrofrequency in the upstream) of a quasi-parallel shock. Some of the upstream ions are reflected by the shock front, and their interactions with the incident ions exc…
Identifying Jittering Jet-shaped Ejecta in the Cygnus Loop Supernova Remnant
Soker, Noam; Shishkin, Dmitry; Kaye, Roy
Analyzing images of the Cygnus Loop, a core-collapse supernova (CCSN) remnant, in different emission bands, we identify a point-symmetrical morphology composed of three symmetry axes that we attribute to shaping by three pairs of jets. The main jet axis has an elongated S shape, appearing as a faint narrow zone in visible and UV. We term it the S-…
Infrared spectroscopy of SWIFT J0850.8-4219: identification of the second red supergiant X-ray binary in the Milky Way
Soria, Roberto; De, Kishalay; Daly, Fiona A.
High-mass X-ray binaries hosting red supergiant (RSG) donors are a rare but crucial phase in massive stellar evolution, with only one source previously known in the Milky Way. In this letter, we present the identification of the second Galactic RSG X-ray binary SWIFT J0850.8-4219. We identify the source 2MASS 08504008-4211514 as the likely infrare…
The Thickness of Galaxy Disks from z = 5 to 0 Probed by JWST
Lian, Jianhui; Luo, Li
Although a thick disk is a structure prevalent in local disk galaxies and also present in our home Galaxy, its formation and evolution are still unclear. Whether the thick disk is born thick and/or gradually heated to be thick after formation is under debate. To disentangle these two scenarios, one effective approach is to inspect the thickness of…
JWST/MIRI Detection of a Carbon-rich Chemistry in the Disk of a Solar Nebula Analog
Pascucci, Ilaria; Banzatti, Andrea; Bergin, Edwin A. +16 more
It has been proposed, and confirmed by multiple observations, that disks around low-mass stars display a molecule-rich emission and carbon-rich disk chemistry as compared to their hotter, more massive solar counterparts. In this work, we present JWST Disk Infrared Spectral Chemistry Survey MIRI-MRS observations of the solar-mass star DoAr 33, a lo…
TESS Giants Transiting Giants. IV. A Low-density Hot Neptune Orbiting a Red Giant Star
Rice, Malena; Angus, Ruth; Huber, Daniel +14 more
Hot Neptunes, gaseous planets smaller than Saturn (∼3–8 R ⊕) with orbital periods less than 10 days, are rare. Models predict this is due to high-energy stellar irradiation stripping planetary atmospheres over time, often leaving behind only rocky planetary cores. Using our TESS full-frame-image pipeline giants in conjunction with Keck/…
Disentangling the association of PAH molecules with star formation. Insights from the James Webb Space Telescope and from the UltraViolet Imaging Telescope
Mathew, Blesson; Kartha, Sreeja S.; Subramanian, Smitha +4 more
Context. Polycyclic aromatic hydrocarbons (PAHs) are ubiquitous complex molecules in the interstellar medium and are used as an indirect indicator of star formation. On the other hand, the ultraviolet (UV) emission from young massive stars directly traces the star formation activity in a galaxy. The James Webb Space Telescope (JWST), along with th…
Small and Large Dust Cavities in Disks around Mid-M Stars in Taurus
Pascucci, Ilaria; Herczeg, Gregory J.; Johnstone, Doug +10 more
High angular resolution imaging by Atacama Large Millimeter/submillimeter Array (ALMA) has revealed the near universality and diversity of substructures in protoplanetary disks. However, disks around M-type pre-main-sequence stars are still poorly sampled, despite the prevalence of M dwarfs in the Galaxy. Here we present high-resolution (∼50 mas, …
The GUAPOS project - V: The chemical ingredients of a massive stellar protocluster in the making
Testi, L.; Mininni, C.; Lorenzani, A. +9 more
Most stars, including the Sun, are born in rich stellar clusters containing massive stars. Therefore, the study of the chemical reservoir of massive star-forming regions is crucial to understand the basic chemical ingredients available at the dawn of planetary systems. We present a detailed study of the molecular inventory of the hot molecular cor…
Observations with the Differential Speckle Survey Instrument. XI. First Year of Observations from Apache Point Observatory
Majewski, Steven R.; Henry, Todd J.; Chanover, Nancy J. +18 more
The Differential Speckle Survey Instrument (DSSI) was relocated to the Astrophysical Research Consortium 3.5 m telescope at Apache Point Observatory (APO) in early 2022. Here we present results from the first year of observations along with an updated instrument description for DSSI at APO, including a detailed description of a new internal slit m…