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Historical Fermi All-sky Variability Analysis of Galactic Flares
Ajello, M.; Buehler, R.; Kocevski, D. +2 more
The Fermi All-sky Variability Analysis (FAVA) provides a photometric alternative for identifying week-long gamma-ray flares across the entire sky while being independent of any diffuse Galactic or isotropic emission model. We reviewed 779 weeks of Fermi Large Area Telescope data analyzed by FAVA to estimate the rate and origin of Galactic gamma-ra…
The glacial and periglacial evolution of Coprates Chasma (Valles Marineris, Mars)
De Blasio, Fabio Vittorio; Crosta, Giovanni Battista; Fusetti, Davide +1 more
The search for past and present water on Mars, either as liquid or solid ice, with its important climatological and astrobiological consequences, has been bolstered by novel techniques, and from the release of recent imagery. Although ice is more frequently observed at higher latitudes, evidence of ice and water-related deposits and erosional feat…
A type II radio burst associated with solar filament–filament interaction
Zhang, Liang; Chen, Yao; Zheng, Ruisheng
Aims. Solar radio type II bursts are often associated with coronal shocks driven by solar eruptions. In this study, we report a type II burst associated with filament–filament interaction. Methods. Combining the high-quality multiwavelength observations from CHASE, SDO, STEREO, and CALLISTO, we conducted a detailed study of the type II burst assoc…
Occurrence Rates of Exosatellites Orbiting 3–30 M Jup Hosts from 44 Spitzer Light Curves
Vanderburg, Andrew; Dai, Fei; Vos, Johanna M. +1 more
We conduct a comprehensive search for transiting exomoons and exosatellites within 44 archival Spitzer light curves of 32 substellar worlds with estimated masses ranging between 3 and 30 M Jup. This sample's median host mass is 16 M Jup, inclusive of 14 planetary-mass objects, among which one is a wide-orbit exoplanet. We sea…
Dynamical modeling and characteristic analysis of orbits around a comet
He, Yuchen; Wang, Yue; Tian, Lin
As a frontier field of deep-space explorations, the study of comets is of great value to planetary scientific research, resource exploration, and planetary defense. To date, only the ESA's Rosetta spacecraft successfully orbited the comet 67P. The orbital dynamical environment around comets is more complex than that of other small bodies, making t…
The ArgusSpec Prototype: Autonomous Spectroscopic Follow-up of Flares Detected by Large Array Telescopes
Law, Nicholas M.; Corbett, Hank; Carney, Jonathan +7 more
ArgusSpec is a prototype autonomous spectroscopic follow-up instrument designed to characterize flares detected by the Argus Pathfinder telescope array by taking short exposure (30 s) broadband spectra (370–750 nm) at low resolutions (R ∼ 150 at 500 nm). The instrument is built from consumer off-the-shelf astronomical equipment, assembled inside a…
Modelling the dust emission of a filament in the Taurus molecular cloud
Juvela, Mika
Context. Dust emission is an important tool in studies of star-forming clouds as a tracer of column density. This is done indirectly via the dust evolution that is connected to the history and physical conditions of the clouds.
Aims: We examine the radiative transfer (RT) modelling of dust emission over an extended cloud region, using a filam…
A Multiwavelength Approach to Constraining the Merger Properties of ACT-CL J0034.4+0225
Hilton, Matt; Sifón, Cristóbal; Hughes, John P. +10 more
ACT-CL J0034.4+0225 is a previously unrecognized merging galaxy cluster at z = 0.38588 ± 0.00068. Our primary evidence is provided by a 21 ks Chandra image that shows two surface brightness peaks separated by ∼49″ (259 kpc) surrounded by an extended cluster gas distribution. Each gas peak contains a brightest cluster galaxy, offset from the gas pe…
Quantitative modelling of type Ia supernovae spectral time series: constraining the explosion physics
Maguire, K.; Ackley, K.; Magee, M. R. +2 more
Multiple explosion mechanisms have been proposed to explain type Ia supernovae (SNe Ia). Empirical modelling tools have also been developed that allow for fast, customized modelling of individual SNe and direct comparisons between observations and explosion model predictions. Such tools have provided useful insights, but the subjective nature with…
A pilot study of Galactic radio recombination lines using FAST: Identification of diffuse ionized gas clumps and off-arm star-forming regions
Fang, Min; Li, Juan; Li, Shanghuo +6 more
Observing low-frequency decimeter hydrogen radio recombination lines (RRLs) with large single-dish telescopes, such as the Five-hundred-meter Aperture Spherical radio Telescope (FAST) in the L band, is a unique method for probing massive star formation on scales of hundreds of parsecs. This approach is particularly effective for detecting relative…