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The Ages of Galactic Bulge Stars with Realistic Uncertainties
Rich, R. Michael; Johnson, Christian I.; Joyce, Meridith +3 more
Using modern isochrones with customized physics and carefully considered statistical techniques, we recompute the age distribution for a sample of 91 microlensed dwarfs in the Galactic bulge presented by Bensby et al. and do not produce an age distribution consistent with their results. In particular, our analysis finds that only 15 of 91 stars ha…
A real-time transient detector and the living Swift-XRT point source catalogue
Cenko, S. B.; Campana, S.; Kennea, J. A. +5 more
We present the Living Swift-XRT Point Source (LSXPS) catalogue and real-time transient detector. This system allows us for the first time to carry out low-latency searches for new transient X-ray events fainter than those available to the current generation of wide-field imagers, and report their detection in near real time. Previously, such event…
A calibration point for stellar evolution from massive star asteroseismology
Bowman, Dominic M.; Vanderspek, Roland; Aerts, Conny +10 more
Massive stars are progenitors of supernovae, neutron stars and black holes. During the hydrogen-core burning phase, their convective cores are the prime drivers of their evolution, but inferences of core masses are subject to unconstrained boundary mixing processes. Moreover, uncalibrated transport mechanisms can lead to strong envelope mixing and…
The diverse chemistry of protoplanetary disks as revealed by JWST
Kamp, I.; Henning, Th.; Nazari, P. +14 more
Early results from JWST-MIRI programs on low- and high-mass protostars and disks show significant diversity in their mid-infrared spectra, most notably for CO2, H2O and C2H2. Benzene is detected in disks around very low mass stars. Early results from the James Webb Space Telescope-Mid-InfraRed Instrument (JWST-MIRI) guaranteed time programs on pro…
Potential Atmospheric Compositions of TRAPPIST-1 c Constrained by JWST/MIRI Observations at 15 µm
Kreidberg, Laura; Meadows, Victoria S.; Lincowski, Andrew P. +13 more
The first James Webb Space Telescope observations of TRAPPIST-1 c showed a secondary eclipse depth of 421 ± 94 ppm at 15 µm, which is consistent with a bare rock surface or a thin, O2-dominated, low-CO2 atmosphere. Here we further explore potential atmospheres for TRAPPIST-1 c by comparing the observed secondary eclipse…
TOI-5205b: A Short-period Jovian Planet Transiting a Mid-M Dwarf
Kobulnicky, Henry A.; Cochran, William D.; Mahadevan, Suvrath +27 more
We present the discovery of TOI-5205b, a transiting Jovian planet orbiting a solar metallicity M4V star, which was discovered using Transiting Exoplanet Survey Satellite photometry and then confirmed using a combination of precise radial velocities, ground-based photometry, spectra, and speckle imaging. TOI-5205b has one of the highest mass ratios…
Detailed Chemical Abundances of Stars in the Outskirts of the Tucana II Ultrafaint Dwarf Galaxy
Jerjen, Helmut; Frebel, Anna; Simon, Joshua D. +6 more
We present chemical abundances and velocities of five stars between 0.3 and 1.1 kpc from the center of the Tucana II ultrafaint dwarf galaxy (UFD) from high-resolution Magellan/MIKE spectroscopy. We find that every star is deficient in metals (-3.6 < [Fe/H] < -1.9) and in neutron-capture elements as is characteristic of UFD stars, unambiguou…
HelioSwarm: A Multipoint, Multiscale Mission to Characterize Turbulence
Verscharen, Daniel; Retinò, Alessandro; Alexandrova, Olga +47 more
HelioSwarm (HS) is a NASA Medium-Class Explorer mission of the Heliophysics Division designed to explore the dynamic three-dimensional mechanisms controlling the physics of plasma turbulence, a ubiquitous process occurring in the heliosphere and in plasmas throughout the universe. This will be accomplished by making simultaneous measurements at ni…
PHANGS-JWST First Results: Mapping the 3.3 µm Polycyclic Aromatic Hydrocarbon Vibrational Band in Nearby Galaxies with NIRCam Medium Bands
Sandstrom, Karin M.; Bolatto, Alberto D.; Kruijssen, J. M. Diederik +28 more
We present maps of the 3.3 µm polycyclic aromatic hydrocarbon (PAH) emission feature in NGC 628, NGC 1365, and NGC 7496 as observed with the Near-Infrared Camera imager on JWST from the PHANGS-JWST Cycle 1 Treasury project. We create maps that isolate the 3.3 µm PAH feature in the F335M filter (F335MPAH) using combinations o…
Photometric binaries, mass functions, and structural parameters of 78 Galactic open clusters
Milone, Antonino P.; Vesperini, Enrico; Lagioia, Edoardo P. +8 more
Context. Binary stars play a crucial role in our understanding of the formation and evolution of star clusters and their stellar populations.
Aims: We use Gaia Data Release 3 to homogeneously analyze 78 Galactic open clusters and the unresolved binary systems they host, each composed of two main sequence (MS) stars.
Methods: We first inv…