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Compression method for solar polarization spectra collected from Hinode SOT/SP observations
Oba, T.; Iida, Y.; Iijima, H. +1 more
The rapidly increasing volume of observational solar spectral data poses challenges for efficient and accurate analysis. To address this issue, we present a deep learning-based compression technique using the deep autoencoder (DAE) and 1D-convolutional autoencoder (CAE) models, developed for use on the Hinode SOT/SP data. This technique focuses on…
The Role of XMM–Newton in the Investigation of Persistent BeXRBs
Mereghetti, Sandro; Esposito, Paolo; Israel, Gian Luca +2 more
The persistent BeXRBs are a class of high-mass X-ray binaries (HMXRBs), which are characterized by persistent low X-ray luminosities ($$ {L}_{\mathrm{X}}\sim {10}^{34} $$ erg s$$ {}^{-1} $$) and wide ($$ {P}_{\mathrm{orb}}> $$ 30 days), almost circular orbits. In these sources the NS is slowly rotating (with $$ {P}_{\mathrm{spin}} $$ well above…
Analyses of Multiple Balmer Emission Lines from Accreting Brown Dwarfs and Very Low Mass Stars
Hashimoto, Jun; Aoyama, Yuhiko
A planetary growth rate, i.e., the mass accretion rate, is a fundamental parameter in planet formation, as it determines a planet's final mass. Planetary mass accretion rates have been estimated using hydrogen lines, based on the models originally developed for accreting stars, known as the accretion flow model. Recently, Aoyama et al. introduced …
Global Distribution and Seasonality of Martian Atmospheric HCl Explained Through Heterogeneous Chemistry
Trokhimovskiy, Alexander; Korablev, Oleg; Olsen, Kevin S. +4 more
Recent observations from the ExoMars Trace Gas Orbiter (TGO) have revealed the presence of hydrogen chloride (HCl) in the martian atmosphere. HCl shows strong seasonality, primarily appearing during Mars' perihelion period before decreasing faster than projected from photolysis and gas-phase chemistry. HCl profiles also display local anti-correlat…
Imaging and Spectral Fitting of Bright Gamma-Ray Sources with the COSI Balloon Payload
Yoneda, Hiroki; Tomsick, John A.; Cangemi, Floriane +17 more
The Compton Spectrometer and Imager balloon payload (COSI-Balloon) is a wide field-of-view Compton gamma-ray telescope that operates in the 0.2–5 MeV bandpass. COSI-Balloon had a successful 46 day flight in 2016 during which the instrument observed the Crab Nebula, Cygnus X-1, and Centaurus A. Using the data collected by the COSI-Balloon instrumen…
UPdec-Webb: A Data Set for Coaddition of JWST NIRCam Images
Fang, Min; Cheng, Cheng; Kang, Xi +19 more
We present the application of the image coaddition algorithm, upsampling and point-spread function (PSF) deconvolution coaddition (UPDC), for stacking multiple exposure images captured by the James Webb Space Telescope (JWST) Near-Infrared Camera. By addressing the PSF effect, UPDC provides visually enhanced and sharper images. Furthermore, the an…
Cataloging Stream Interaction Regions at MAVEN: A Cross-comparative Study with STEREO-A
Allen, Robert C.; Lee, Christina O.; Halekas, Jasper S. +5 more
Stream interaction regions (SIRs) are long-lasting solar wind structures that result from stable fast solar wind interacting with preceding slow solar wind. These structures have been examined in depth throughout the heliosphere, particularly at 1 au; however, due to sparse observations, SIRs have not been characterized thoroughly at 1.5 au. Thank…
Using the STIX background detector as a proxy for GOES
Volpara, Anna; Krucker, Säm; Dickson, Ewan C. M. +4 more
Context. The Spectrometer/Telescope for Imaging X-Rays (STIX) on board Solar Orbiter was designed to observe solar flares in the X-ray range of 4‑150 keV, providing spectral, temporal, and spatial information. Besides 30 imaging detectors, STIX has two additional detectors: the coarse flare locator (CFL) and the background (BKG) detector, which ar…
Asteroseismic masses of red giants in the Galactic Globular Clusters M9 and M19
Stello, Dennis; Kalup, Csilla; De Silva, Gayandhi M. +2 more
Asteroseismic masses of globular cluster (GC) stars are invaluable to investigate stellar evolution. Previously, only two GCs have been seismically studied. We present new detections of solar-like oscillations in the clusters M9 and M19, focusing on two key areas: stellar mass-loss and GC multiple populations. Using K2 photometry, we detect solar-…
Circumstellar emission of Cepheids across the instability strip: Mid-infrared observations with VLTI/MATISSE
Matter, A.; Smolec, R.; Lopez, B. +14 more
Context. The circumstellar envelopes (CSE) of Cepheids are still only poorly characterized despite their potential impact on the distance determination via both the period-luminosity relation and the parallax-of-pulsation method. Aims. This paper aims to investigate Galactic Cepheids across the instability strip in the mid-infrared with MATISSE/VL…