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NEOWISE Observations of Distant Active Long-period Comets C/2014 B1 (Schwartz), C/2017 K2 (Pan-STARRS), and C/2010 U3 (Boattini)
Masiero, Joseph R.; Milewski, Dave G.; Pittichová, Jana +3 more
Hyperactive comet activity typically becomes evident beyond the frost line (∼3–4 au) where it becomes too cold for water-ice to sublimate. If carbon monoxide (CO) and carbon dioxide (CO2) are the species that drive activity at sufficiently large distances, then detailed studies on the production rates of these species are extremely valu…
The Galactic bulge exploration. II. Line-of-sight velocity templates for single-mode RR Lyrae stars
Smolec, R.; Prudil, Z.; Kunder, A. +2 more
We present a new set of tools to derive systemic velocities for single-mode RR Lyrae stars from visual and near-infrared spectra. We derived scaling relations and line-of-sight velocity templates using both APOGEE and Gaia spectroscopic products combined with photometric G-band amplitudes. We provide a means to estimate systemic velocities for the…
A global view on star formation: The GLOSTAR Galactic plane survey: XI. Radio source catalog IV: 2° < ℓ < 28°, 36° < ℓ < 60° and |b| < 1°
Menten, K. M.; Khan, S.; Csengeri, T. +17 more
Context. The GLObal view on STAR formation in the Milky Way (GLOSTAR) survey studies star formation with the Very Large Array (VLA) and the Effelsberg 100 meter radio telescope in the Galactic plane between ‑2° < ℓ < 60° and |b| < 1°, and the Cygnus X region (76° < ℓ < 83° and ‑1° < b < 2°), with unprecedented sensitivity in b…
Testing theories of accretion and gravity with super-extremal Kerr discs
Ingram, Adam; Mummery, Andrew; Balbus, Steven
Fitting the thermal continuum emission of accreting black holes observed across X-ray bands represents one of the principle means of constraining the properties (mass and spin) of astrophysical black holes. Recent 'continuum fitting' studies of Galactic X-ray binaries in the soft state have found best-fitting dimensionless spin values which run in…
Dynamics and potential origins of decimeter-sized particles around comet 67P/Churyumov-Gerasimenko
Agarwal, Jessica; Grieger, Björn; Marschall, Raphael +2 more
Context. One of the primary goals of the European Space Agency's Rosetta mission to comet 67P/Churyumov-Gerasimenko was to investigate the mechanisms responsible for cometary activity.
Aims: Our aim is to learn more about the ejection process of large refractory material by studying the dynamics of decimeter-sized dust particles in the coma o…
Using autoencoders and deep transfer learning to determine the stellar parameters of 286 CARMENES M dwarfs
Caballero, J. A.; Montes, D.; Passegger, V. M. +9 more
Context. Deep learning (DL) techniques are a promising approach among the set of methods used in the ever-challenging determination of stellar parameters in M dwarfs. In this context, transfer learning could play an important role in mitigating uncertainties in the results due to the synthetic gap (i.e. difference in feature distributions between …
ALMA follow-up of 3000 red-Herschel galaxies: the nature of extreme submillimetre galaxies
Zavala, Jorge A.; Hughes, David H.; Aretxaga, Itziar +2 more
We present the analysis of over 3000 red-Herschel sources (
A pilot search for MeV gamma-ray emission from five galaxy clusters using archival COMPTEL data
Manna, Siddhant; Desai, Shantanu
We search for MeV gamma-ray emission between 0.75–30 MeV from five galaxy clusters, viz. Coma, VIRGO, SPT-CL J2012-5649, Bullet, and El Gordo, using archival data from the COMPTEL telescope. For this purpose we use three search templates: point source, radial disk and radial Gaussian. We do not detect any signals from Coma, SPT-CL J2012-5649, Bull…
Every Data Point Counts: Stellar Flares as a Case Study of Atmosphere-aided Studies of Transients in the LSST Era
Davenport, James R. A.; Bosch, James; Graham, Melissa L. +9 more
Due to their short timescale, stellar flares are a challenging target for the most modern synoptic sky surveys. The upcoming Vera C. Rubin Legacy Survey of Space and Time (LSST), a project designed to collect more data than any precursor survey, is unlikely to detect flares with more than one data point in its main survey. We developed a methodolo…
Phobos photometric properties from Mars Express HRSC observations
Barucci, M. A.; Fornasier, S.; Matz, K. -D. +5 more
Aims: This study aims to analyze Phobos' photometric properties using Mars Express mission observations to support the Martian Moons exploration mission (MMX) devoted to the investigation of the Martian system and to the return of Phobos samples.
Methods: We analyzed resolved images of Phobos acquired between 2004 and 2022 by the High Re…