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Evidence of ram-pressure stripping of WLM, a dwarf galaxy far away from any large host galaxy
Józsa, Gyula I. G.; McConnachie, Alan W.; Hammer, Francois +5 more
Dwarf galaxies are affected by all the evolutionary processes normally at work in galaxies of any mass. As fainter and less massive galaxies, however, dwarf galaxies are particularly susceptible to environmental mechanisms that can more easily perturb these systems. Importantly, the presence of nearby large galaxies is expected to have a profound …
Thermal and Nonthermal Emission in the Optical-UV Spectrum of PSR B0950+08
Pavlov, George G.; Kargaltsev, Oleg; Abramkin, Vadim +1 more
Based on recent Hubble Space Telescope (HST) observations in the far-UV and ground-based observations in optical bands, Pavlov and colleagues have revealed a thermal component in the spectrum of the old pulsar B0950+08 (spin-down age 17.5 Myr) and estimated a neutron star (NS) surface temperature of (1-3) × 105 K. Our new HST observatio…
Understanding Accretion Variability through TESS Observations of Taurus
Rodriguez, Joseph E.; Espaillat, Catherine C.; Robinson, Connor E.
Interpreting the short-timescale variability of the accreting, young, low-mass stars known as Classical T Tauri stars remains an open task. Month-long, continuous light curves from the Transiting Exoplanet Survey Satellite (TESS) have become available for hundreds of T Tauri stars. With this vast data set, identifying connections between the varia…
Beyond the Local Volume. I. Surface Densities of Ultracool Dwarfs in Deep HST/WFC3 Parallel Fields
Holwerda, Benne; Burgasser, Adam J.; Ryan, Russell E. +6 more
Ultracool dwarf stars and brown dwarfs provide a unique probe of large-scale Galactic structure and evolution; however, until recently spectroscopic samples of sufficient size, depth, and fidelity have been unavailable. Here, we present the identification of 164 M7-T9 ultracool dwarfs in 0.6 deg2 of deep, low-resolution, near-infrared s…
The VVV survey: Long-period variable stars. I. Photometric catalog of ten VVV/OGLE tiles
Minniti, D.; Zoccali, M.; Rojas-Arriagada, A. +7 more
Context. Long-period variable stars (LPVs) are pulsating red giants, primarily in the asymptotic giant branch phase, and they include both Miras and semi-regular variables (SRVs). Their period-age and period-luminosity relations enable us to trace different stellar populations, as they are intrinsically very bright and cover a wide range in distan…
Callisto's Atmosphere: First Evidence for H2 and Constraints on H2O
Alday, Juan; Johnson, Robert E.; Roth, Lorenz +8 more
We explore the parameter space for the contribution to Callisto's H corona observed by the Hubble Space Telescope from sublimated H2O and radiolytically produced H2 using the Direct Simulation Monte Carlo method. The spatial morphology of this corona produced via photoelectron and magnetospheric electron-impact-induced dissoc…
The white dwarf binary pathways survey - VII. Evidence for a bi-modal distribution of post-mass transfer systems?
Gänsicke, B. T.; Parsons, S. G.; Hernandez, M. S. +5 more
Binary systems consisting of a white dwarf (WD) and a main-sequence companion with orbital periods up to ≈100 d are often thought to be formed through common envelope evolution which is still poorly understood. To provide new observational constraints on the physical processes involved in the formation of these objects, we are conducting a large-s…
Apsidal motion in massive eccentric binaries: The case of CPD-41° 7742, and HD 152218 revisited
Gosset, E.; Sterken, C.; Nazé, Y. +2 more
Context. This paper is part of a study of the apsidal motion in close eccentric massive binary systems, which aims to constrain the internal structure of the stars. We focus on the binary CPD-41° 7742 and briefly revisit the case of HD 152218.
Aims: Independent studies of CPD-41° 7742 in the past showed large discrepancies in the longitude of…
CLASSY V: The Impact of Aperture Effects on the Inferred Nebular Properties of Local Star-forming Galaxies
Martin, Crystal L.; Brinchmann, Jarle; Charlot, Stéphane +23 more
Strong nebular emission lines are an important diagnostic tool for tracing the evolution of star-forming galaxies across cosmic time. However, different observational setups can affect these lines, and the derivation of the physical nebular properties. We analyze 12 local star-forming galaxies from the COS Legacy Spectroscopy SurveY (CLASSY) to as…
SOFIA Observations of Far-IR Fine-structure Lines in Galaxies to Measure Metallicity
Spinoglio, Luigi; Fernández-Ontiveros, Juan Antonio; Malkan, Matthew A. +8 more
We present new and archival SOFIA FIFI-LS far-IR spectroscopic observations of the [O III] 52 µm and/or the [N III] 57 µm lines of 25 local galaxies. Including 31 other galaxies from Herschel-PACS, we discuss a local sample of 47 galaxies, including the H II galaxies, luminous IR galaxies, low-metallicity dwarfs, and Seyfert nuclei. An…