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Euclid: Detecting Solar System objects in Euclid images and classifying them using Kohonen self-organising maps
Altieri, B.; Cimatti, A.; Aghanim, N. +141 more
The ESA Euclid mission will survey more than 14 000 deg2 of the sky in visible and near-infrared wavelengths, mapping the extragalactic sky to constrain our cosmological model of the Universe. Although the survey focusses on regions further than 15° from the ecliptic, it should allow for the detection of more than about 105 S…
Mind the Gap. II. The Near-UV Fluxes of M Dwarfs
Youngblood, Allison; Jao, Wei-Chun
Because of the continuous variations in mass, metallicity, and opacity, dwarf stars are distributed along the main sequence on optical and near-IR color–magnitude diagrams following a smooth polynomial. In this study, utilizing a catalog of crossmatched Galaxy Evolution Explorer (GALEX) and Gaia sources, we identify two distinct populations of M d…
New Potential Ultracompact X-Ray Binaries for Space-based Gravitational-wave Detectors from a Low-mass Main-sequence Companion Channel
Liu, Jinzhong; Chen, Minghua
We investigate the formation and evolution of ultracompact X-ray binaries (UCXBs) using the COMPAS binary evolution code, starting from the zero-age main sequence (MS). Focusing on the low-mass MS companion channel, we simulate gravitational-wave (GW) signals from UCXBs with LEGWORK and evaluate their detectability by space-based observatories suc…
Red Stellar Populations and Dust Extinction toward W3
Martin, P. G.; Campbell, J. L.; Rahman, M. +2 more
We explore red stellar populations toward the W3 giant molecular cloud through the use of optical-to-infrared (IR) photometry and Gaia DR 3 data, simultaneously characterizing stellar content and properties of dust in the molecular medium. We use a Rayleigh–Jeans color excess method modified to de-redden stellar observations of both red giants (RG…
Identifying Coronal Mass Ejection Active Region Sources: An Automated Approach
Green, Lucie M.; Hernandez Camero, Julio; Piñel Neparidze, Alex
Identifying the source regions of coronal mass ejections (CMEs) is crucial for understanding their origins and improving space weather forecasting. We present an automated algorithm for matching CMEs detected by the Large Angle Spectrometric Coronagraph with their source active regions, specifically Space Weather HMI Active Region Patches (SHARPs)…
Detection of Semidetached Eclipsing Binaries from TESS
Ding, Xu; Ji, KaiFan; Cheng, QiYuan +4 more
Semidetached binaries, distinguished by their mass transfer phase, play a crucial role in elucidating the physics of mass transfer within interacting binary systems. To identify these systems in eclipsing binary light curves provided by large-scale time-domain surveys, we have developed a methodology by training two distinct models that establish …
Hidden in Plain Sight: Searching for Dark Companions to Bright Stars with the Large Binocular Telescope and SHARK-VIS
Kochanek, C. S.; Testa, V.; Antoniucci, S. +15 more
We report the results from a pilot study to search for black holes and other dark companions in binary systems using direct imaging with SHARK-VIS and the iLocater pathfinder "Lili" on the Large Binocular Telescope. Starting from known single-lined spectroscopic binaries, we select systems with high mass functions that could host dark companions a…
Kinematics of Young Stellar Objects under Various Stellar Feedback
Xu, Y.; Yang, Longhui; Liu, Dejian +6 more
Based on the Gaia Data Release 3 and APOGEE data sets, we investigate the kinematic differences between young stellar objects (YSOs) and their parent clouds in five nearby star-forming regions. Overall, the one-dimensional velocity differences between Class II YSOs and their parent molecular cloud range from [0, 1.4] km s‑1. In feedback…
NGTS-31b and NGTS-32b: two inflated hot Jupiters orbiting subgiant stars
Ramsay, Gavin; Wheatley, Peter J.; Bayliss, Daniel +38 more
We present the discoveries of NGTS-31b(= TOI-2721), and NGTS-32b, two hot Jupiters from the Next Generation Transit Survey (NGTS) transiting slightly evolved stars. The orbital periods, radii, and masses are 4.16 and 3.31 d, 1.61 and 1.42
LAMOST Reveals Long-lived Protoplanetary Disks
Fang, Min; Liu, Yao; Wang, Xiao-Long +2 more
While both observations and theories demonstrate that protoplanetary disks are not expected to live much longer than ∼10 Myr, several examples of prolonged disks have been observed in the past. In this work, we perform a systematic search for aged young stellar objects still surrounded by protoplanetary disks in the M-star catalog from the LAMOST …