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Multiband embeddings of light curves
Catelan, M.; Protopapas, P.; Becker, I. +1 more
In this work, we propose a novel ensemble of recurrent neural networks (RNNs) that considers the multiband and non-uniform cadence without having to compute complex features. Our proposed model consists of an ensemble of RNNs, which do not require the entire light curve to perform inference, making the inference process simpler. The ensemble is ab…
Simultaneous optical and X-ray detection of a thermonuclear burst in the 2024 outburst of EXO 0748-676
Ingram, Adam; Roberts, Timothy P.; Middleton, Matthew +5 more
The neutron star low-mass X-ray binary, EXO 0748-676, recently returned to outburst after a
Y Gem, a symbiotic star outshone by its asymptotic giant branch primary component
Guerrero, M. A.; Toalá, J. A.; Rodríguez-González, J. B. +2 more
Context. A considerable number of asymptotic giant branch (AGB) stars exhibit UV excess and/or X-ray emission that indicates a binary companion. AGB stars are so bright that they easily outshine their companions. This almost prevents their identification. Y Gem has been known for some decades to be an AGB star that is bright in the far-UV and X-ra…
Estimating uncertainties in the back-mapping of the fast solar wind
Dolla, L.; Keppens, R.; Koukras, A.
Context. Although the most likely source regions of fast solar wind relate to coronal holes, the exact acceleration mechanism that drives the fast solar wind is still not fully understood. An important approach that can improve our understanding involves the combination of remote sensing and in situ measurements, often referred to as linkage analy…
Unusual X-Ray Oxygen Line Ratios of SN 1987A Arising from the Absorption of Galactic Hot Interstellar Medium
Greco, Emanuele; Vink, Jacco; Miceli, Marco +5 more
Recent high-resolution X-ray spectroscopic studies have revealed unusual oxygen line ratios, such as the high O VII forbidden-to-resonance ratio, in several supernova remnants. While the physical origin is still under debate, for most of them it has been suggested that this phenomenon arises from either charge exchange (CX) or resonant scattering …
The Structure of the Molecular Envelope of the Ring Nebula (NGC 6720)
Wilner, David J.; De Marco, Orsola; Kastner, Joel H. +5 more
We present the first interferometric imaging of molecular line emission from the Ring Nebula, NGC 6720, in the form of Submillimeter Array (SMA) observations of CO J = 2 → 1 emission. The SMA 12CO(2–1) mapping data, with ∼3″ spatial resolution and 2 km s‑1 velocity resolution, provide an unprecedentedly detailed, 3D view of t…
A population synthesis study of the Gaia 100 pc unresolved white dwarf-main-sequence binary population
Rebassa-Mansergas, A.; Torres, S.; Brown, A. J. +1 more
Context. Binaries consisting of a white dwarf and a main-sequence star (WDMSs) are excellent tools for studying a wide variety of open problems in modern astronomy. However, due to selection effects, the currently known WDMS population is severely affected by observational biases. This is particularly the case for unresolved systems in which the m…
Exo-MerCat v2.0.0: Updates and open-source release of the Exoplanet Merged Catalog software
Zinzi, Angelo; Carleo, Ilaria; Mandell, Avi +8 more
Exoplanet research is at the forefront of contemporary astronomy recommendations. As more and more exoplanets are discovered and vetted, databases and catalogs are built to collect information. Various resources are available to scientists for this purpose, though every one of them has different scopes and notations. In Alei et al. (2020) we descr…
Introducing the Condor Array Telescope. VI. Discovery of Extensive Ionized Gaseous Filaments of the Cosmic Web in the Direction of the M81 Group
Walter, Frederick M.; Shara, Michael M.; Lanzetta, Kenneth M. +3 more
We used the Condor Array Telescope to obtain deep imaging observations through luminance broadband and He II, [O III], He I, Hα, [N II], and [S II] narrowband filters of an extended region of the M81 Group spanning ≈8 × 8 deg2 on the sky centered near M81 and M82. Here, we report aspects of these observations that are specifically relat…
Untangling Magellanic Streams
Conroy, Charlie; Cargile, Phillip A.; Naidu, Rohan P. +3 more
The Magellanic Stream (MS) is known to contain multiple H<small>I</small> strands and corresponding stellar populations are being discovered. Combining a sample of 17 stars from the H3 ("Hectochelle in the Halo at High Resolution") survey with 891 stars drawn from the Gaia DR3 catalog, we trace stars along a sub-dominant strand of the …