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PBjam: A Python Package for Automating Asteroseismology of Solar-like Oscillators
García, R. A.; Chaplin, W. J.; Moya, A. +14 more
Asteroseismology is an exceptional tool for studying stars using the properties of observed modes of oscillation. So far the process of performing an asteroseismic analysis of a star has remained somewhat esoteric and inaccessible to nonexperts. In this software paper we describe PBjam, an open-source Python package for analyzing the frequency spe…
The survey of planetary nebulae in Andromeda (M 31). III. Constraints from deep planetary nebula luminosity functions on the origin of the inner halo substructures in M 31
Caldwell, Nelson; Freeman, Kenneth C.; Gerhard, Ortwin +4 more
Context. The Andromeda (M 31) galaxy displays several substructures in its inner halo. Different simulations associate their origin with either a single relatively massive merger, or with a larger number of distinct, less massive accretions.
Aims: The origin of these substructures as remnants of accreted satellites or perturbations of the pre…
Gaia pulsars and where to find them
Antoniadis, John
While the majority of massive stars have a stellar companion, most pulsars appear to be isolated. Taken at face value, this suggests that most massive binaries break apart due to strong natal kicks received in supernova explosions. However, the observed binary fraction can still be subject to strong selection effects, as monitoring of newly discov…
Molecules with ALMA at Planet-forming Scales. XX. The Massive Disk around GM Aurigae
Zhang, Ke; Wilner, David J.; Ménard, François +25 more
Gas mass remains one of the most difficult protoplanetary disk properties to constrain. With much of the protoplanetary disk too cold for the main gas constituent, H2, to emit, alternative tracers such as dust, CO, or the H2 isotopologue HD are used. However, relying on disk mass measurements from any single tracer requires a…
Phase-Space Correlations among Systems of Satellite Galaxies
Pawlowski, Marcel S.
Driven by the increasingly complete observational knowledge of systems of satellite galaxies, mutual spatial alignments and relations in velocities among satellites belonging to a common host have become a productive field of research. Numerous studies have investigated different types of such phase-space correlations and were met with varying deg…
A transient radio source consistent with a merger-triggered core collapse supernova
Kulkarni, S. R.; Hallinan, G.; Horesh, A. +10 more
A core collapse supernova occurs when exothermic fusion ceases in the core of a massive star, which is typically caused by exhaustion of nuclear fuel. Theory predicts that fusion could be interrupted earlier by merging of the star with a compact binary companion. We report a luminous radio transient, VT J121001+495647, found in the Very Large Arra…
Revealing the relation between black hole growth and host-galaxy compactness among star-forming galaxies
Brandt, W. N.; Xue, Y. Q.; Luo, B. +8 more
Recent studies show that a universal relation between black hole (BH) growth and stellar mass (M⋆) or star formation rate (SFR) is an oversimplification of BH-galaxy coevolution, and that morphological and structural properties of host galaxies must also be considered. Particularly, a possible connection between BH growth and host-galax…
Testing the role of environmental effects on the initial mass function of low-mass stars
Jose, Jessy; Samal, Manash R.; Moraux, Estelle +3 more
In the star-formation process, the vital impact of environmental factors such as feedback from massive stars and stellar density on the form of the initial mass function (IMF) at the low-mass end is yet to be understood. Hence a systematic highly sensitive observational analysis of a sample of regions under diverse environmental conditions is esse…
The Extraordinary Outburst in the Massive Protostellar System NGC 6334 I-MM1: Strong Increase in Mid-Infrared Continuum Emission
Stecklum, B.; Dowell, C. D.; Hunter, T. R. +7 more
In recent years, dramatic outbursts have been identified toward massive protostars via infrared and millimeter dust continuum and molecular maser emission. The longest lived outburst (>6 yr) persists in NGC 6334 I-MM1, a deeply embedded object with no near-IR counterpart. Using FORCAST and HAWC+ on SOFIA, we have obtained the first mid-IR image…
The Star Formation History of Eridanus II: On the Role of Supernova Feedback in the Quenching of Ultrafaint Dwarf Galaxies
Salvadori, S.; Anderson, J.; Cignoni, M. +17 more
Eridanus II (Eri II) is an ultrafaint dwarf (UFD) galaxy (MV = -7.1) located at a distance close to the Milky Way virial radius. Early shallow color-magnitude diagrams (CMDs) indicated that it possibly hosted an intermediate-age or even young stellar population, which is unusual for a galaxy of this mass. In this paper, we present new H…