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EvryFlare. III. Temperature Evolution and Habitability Impacts of Dozens of Superflares Observed Simultaneously by Evryscope and TESS
Law, Nicholas M.; Corbett, Hank; Gonzalez, Ramses +8 more
Superflares may provide the dominant source of biologically relevant UV radiation to rocky habitable-zone M-dwarf planets (M-Earths), altering planetary atmospheres and conditions for surface life. The combined line and continuum flare emission has usually been approximated by a 9000 K blackbody. If superflares are hotter, then the UV emission may…
A Dynamical Survey of Stellar-mass Black Holes in 50 Milky Way Globular Clusters
Chatterjee, Sourav; Kremer, Kyle; Weatherford, Newlin C. +1 more
Recent numerical simulations of globular clusters (GCs) have shown that stellar-mass black holes (BHs) play a fundamental role in driving cluster evolution and shaping their present-day structure. Rapidly mass-segregating to the center of GCs, BHs act as a dynamical energy source via repeated superelastic scattering, delaying the onset of core col…
Hydrodynamic simulations unravel the progenitor-supernova-remnant connection in SN 1987A
Miceli, M.; Bocchino, F.; Orlando, S. +8 more
Context. Massive stars end their lives in catastrophic supernova (SN) explosions. Key information on the explosion processes and on the progenitor stars can be extracted from observations of supernova remnants (SNRs), which are the outcome of SNe. Deciphering these observations, however, is challenging because of the complex morphology of SNRs.
Combined analysis of AMS-02 (Li,Be,B)/C, N/O, 3He, and 4He data
Maurin, D.; Génolini, Y.; Derome, L. +2 more
Context. The Alpha Magnetic Spectrometer (AMS-02) measured several secondary-to-primary ratios enabling a detailed study of Galactic cosmic-ray transport.
Aims: We constrain previously derived benchmark scenarios (based on AMS-02 B/C data only) using other secondary-to-primary ratios to test the universality of transport and the presence of a…
Magnitude and direction of the local interstellar magnetic field inferred from Voyager 1 and 2 interstellar data and global heliospheric model
Izmodenov, Vladislav V.; Alexashov, Dmitry B.
In this Letter, we provide constraints on the direction and magnitude of the pristine (i.e., unperturbed by the interaction with the Sun) local interstellar magnetic field. The constraints are based on analysis of the interstellar magnetic field components at the heliopause measured by magnetometer instruments on board Voyager 1 and 2 spacecraft. …
Metallicity and α-Element Abundance Gradients along the Sagittarius Stream as Seen by APOGEE
Cohen, Roger E.; Bizyaev, Dmitry; Brownstein, Joel R. +27 more
Using 3D positions and kinematics of stars relative to the Sagittarius (Sgr) orbital plane and angular momentum, we identify 166 Sgr stream members observed by the Apache Point Observatory Galactic Evolution Experiment (APOGEE) that also have Gaia DR2 astrometry. This sample of 63/103 stars in the Sgr trailing/leading arm is combined with an APOGE…
The ALMA Spectroscopic Survey in the HUDF: The Cosmic Dust and Gas Mass Densities in Galaxies up to z ∼ 3
Carilli, Chris; Inami, Hanae; Smail, Ian +24 more
Using the deepest 1.2 mm continuum map to date in the Hubble Ultra Deep Field, which was obtained as part of the ALMA Spectroscopic Survey (ASPECS) large program, we measure the cosmic density of dust and implied gas (H2+H I) mass in galaxies as a function of look-back time. We do so by stacking the contribution from all H-band selected…
The Tarantula Massive Binary Monitoring. III. Atmosphere analysis of double-lined spectroscopic systems
Lennon, D. J.; de Mink, S. E.; de Koter, A. +17 more
Context. Accurate stellar parameters of individual objects in binary systems are essential to constrain the effects of binarity on stellar evolution. These parameters serve as a prerequisite to probing existing and future theoretical evolutionary models.
Aims: We aim to derive the atmospheric parameters of the 31 double-lined spectroscopic bi…
Evidence of a dynamically evolving Galactic warp
Bailer-Jones, C. A. L.; Fouesneau, M.; Andrae, R. +5 more
In a cosmological setting, the disk of a galaxy is expected to continuously experience gravitational torques and perturbations from a variety of sources, which can cause the disk to wobble, flare and warp1,2. Specifically, the study of galactic warps and their dynamic nature could reveal key information on the formation history of galax…
Multi-gigayear White Dwarf Cooling Delays from Clustering-enhanced Gravitational Sedimentation
Cheng, Sihao; Bildsten, Lars; Schwab, Josiah +1 more
Cooling white dwarfs (WDs) can yield accurate ages when theoretical cooling models fully account for the physics of the dense plasma of WD interiors. We use MESA to investigate cooling models for a set of massive and ultramassive WDs (0.9-1.3 ${M}_{\odot }$ ) for which previous models have failed to match kinematic age indicators based on Gaia DR2…