Search Publications
The first light curve analysis of twin binary system V1175 Cas using ground-based and TESS data
Alan, Neslihan
Eclipsing binary systems hold a central position within astrophysics in that the fundamental parameters of stars can be determined by direct observations. The simultaneous analyses of high-quality space observations, combined with ground-based photometric data, have allowed more sensitive detection of fundamental stellar parameters by multicolor p…
Gaia23ckh: Symbiotic outburst of the assumed Mira variable V390 Sco
Skowron, Jan; Charbonnel, Stéphane; Garde, Olivier +5 more
The poorly studied variable star V390 Sco, previously classified as a Mira pulsator, was detected in a brightening event by the ESA Gaia satellite in September 2023. This work presents an analysis of available archival multifrequency photometric data of this target, along with our spectroscopic observations. Our findings lead to the conclusion tha…
MIRI MRS Observations of Beta Pictoris. II. The Spectroscopic Case for a Recent Giant Collision
Law, David R.; Chen, Christine H.; Hines, Dean C. +17 more
Modeling observations of the archetypal debris disk around β Pic, obtained in 2023 January with the MIRI Medium Resolution Spectrograph on board JWST, reveals significant differences compared with that obtained with the Infrared Spectrograph on board Spitzer. The bright 5–15 µm continuum excess modeled using a ∼600 K black body has disappear…
Multi-scale CLEAN for Fourier-based hard x-ray solar imaging
Volpara, Anna; Piana, Michele; Maria Massone, Anna +1 more
Multi-scale deconvolution is an ill-posed inverse problem in imaging, with applications ranging from microscopy, through medical imaging, to astronomical remote sensing. In the case of high-energy space telescopes, multi-scale deconvolution algorithms need to account for the peculiar property of native measurements, which are sparse samples of the…
Unravelling the nuclear dust morphology of NGC 1365: a two-phase polar-RAT model for the ultraviolet to infrared spectral energy distribution
Shalima, P.; Swain, Subhashree; Latha, K. V. P.
We present a 3D radiative transfer model for the spectral energy distribution (SED) of NGC 1365, which is a 'changing look' Seyfert 1.8 type active galactic nucleus (AGN). The SED from the ultraviolet (UV) to the infrared (IR) is constructed using archival data from the Ultra-Violet Imaging Telescope (UVIT) onboard AstroSat, along with IR data fro…
Disk Turbulence and Star Formation Regulation in High-z Main-sequence Analog Galaxies
Glazebrook, Karl; Lenkić, Laura; Bolatto, Alberto D. +7 more
The gas-phase velocity dispersions in disk galaxies, which trace turbulence in the interstellar medium, are observed to increase with lookback time. However, the mechanisms that set this rise in turbulence are observationally poorly constrained. To address this, we combine kiloparsec-scale Atacama Large Millimeter/submillimeter Array observations …
Prediction of Astrometric and Timing Microlensing Events with Pulsars by ATNF Catalog and Gaia DR3
Xie, Yi; Lu, Xu
Determining the mass of neutron stars is crucial for understanding their formation, evolution, and interior structure. Currently, only a few dozen neutron stars have had their masses measured, and most of them belong to binary systems. However, there are a huge number of isolated neutron stars with unknown masses. Microlensing events with neutron …
The 3D geometry of reflection nebulae IC 59 and IC 63 with their illuminating star gamma Cas
Lai, Thomas S. -Y.; Witt, Adolf N.; Caputo, Miranda +1 more
The early-type star gamma Cas illuminates the reflection nebulae IC 59 and IC 63, creating two photodissociation regions (PDRs). Uncertainties about the distances to the nebulae and the resulting uncertainty about the density of the radiation fields incident on their surfaces have hampered the study of these PDRs during the past three decades. We …
Stellar halo density with LAMOST K and M giants
Wang, H. -F.; López-Corredoira, M.; Liu, C. +3 more
Aims: We derive the morphology of the stellar component in the outer halo volume, and search for possible overdensities due to substructures therein.
Methods: We made use of some of the data releases of the spectroscopic survey LAMOST DR8-DR9 in tandem with distance determinations for two subsamples, that is, of K-giants and M-giants, re…
Solar Energetic Particle and the Heliospheric Current Sheet
Wu, Chin-Chun; Liou, Kan
The effect of the heliospheric current sheet (HCS) on the propagation of solar energetic particles (SEPs) remains poorly known. In this study we address this question by surveying energetic (∼2.0–9.6 MeV nucleon–1) helium data acquired by the energetic particle acceleration, composition, and transport (EPACT) sensor on board the Wind sp…