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Age-dating the young open cluster UBC 1 with g-mode asteroseismology, gyrochronology, and isochrone fitting
Aerts, C.; Li, G.; Van Reeth, T. +3 more
Aims: UBC 1 is an open cluster discovered in Gaia data and located near the edge of the Transiting Exoplanet Survey Satellite's (TESS) continuous viewing zone. We aim to provide age constraints for this poorly studied open cluster from the combination of gravity-mode (g-mode) asteroseismology, gyrochronology, and isochrone fitting.
Metho…
A low-mass helium star progenitor model for the Type Ibn SN 2020nxt
Van Dyk, Schuyler D.; Filippenko, Alexei V.; Chambers, Kenneth C. +55 more
A growing number of supernovae (SNe) are now known to exhibit evidence for significant interaction with a dense, pre-existing, circumstellar medium (CSM). SNe Ibn comprise one such class that can be characterized by both rapidly evolving light curves and persistent narrow He I lines. The origin of such a dense CSM in these systems remains a pressi…
Spinning primordial black holes from first order phase transition
Banerjee, Indra Kumar; Dey, Ujjal Kumar
We conduct a novel study to obtain the initial spin of the primordial black holes created during a first-order phase transition due to delayed false vacuum decay. Remaining within the parameter space consistent with observational bounds, we express the abundance and the initial spin of the primordial black holes as functions of the phase transitio…
The Milky Way bar pattern speed using Hercules and Gaia DR3
Aguerri, J. Alfonso L.; D'Onghia, Elena; Lucchini, Scott
The distribution of moving groups in the solar neighbourhood has been used to constrain dynamical properties of the Milky Way for decades. The kinematic bimodality between the main mode (Hyades, Pleiades, Coma Berenices, and Sirius) and Hercules can be explained by two different bar models - via the outer Lindblad resonance of a bar with a high pa…
The Multilayer Nature of Molecular Gas toward the Cygnus Region
Fang, Min; Chen, Zhiwei; Zhang, Shiyu +12 more
We study the physical properties and 3D distribution of molecular clouds (MCs) toward the Cygnus region using the MWISP CO survey and Gaia DR3 data. Based on Gaussian decomposition and clustering for 13CO lines, over 70% of the fluxes are recovered. With the identification result of 13CO structures, two models are designed to…
Linking Mg II and [O II] spatial distribution to ionizing photon escape in confirmed LyC leakers and non-leakers
Blaizot, Jérémy; Verhamme, Anne; Scarlata, Claudia +29 more
The geometry of the neutral gas in and around galaxies is a key regulator of the escape of ionizing photons. We present the first statistical study aimed at linking the neutral and ionized gas distributions to the Lyman continuum (LyC) escape fraction (fescLyC) in a sample of 22 confirmed LyC leakers and non-leakers at z ≈ 0.…
A Young Super Star Cluster Powering a Nebula of Retained Massive Star Ejecta
Pascale, Massimo; Dai, Liang
We suggest that "Godzilla" of the lensed Sunburst galaxy (z = 2.37) is a young super star cluster powering a nebula of gravitationally trapped stellar ejecta. Employing Hubble Space Telescope photometry and spectroscopy from the Very Large Telescope (VLT) MUSE and VLT/X-Shooter, we infer the physical and chemical properties of the cluster and nebu…
Using JWST Transits and Occultations to Determine ∼1% Stellar Radii and Temperatures of Low-mass Stars
Kirk, James; Eastman, Jason D.; Mahajan, Alexandra S.
Using JWST observations of a primary transit and two secondary eclipses for GJ 1214b, we determine an eccentricity that is more precise than a decade of HARPS data, which enables us to measure the stellar density to 2.62%. Coupled with a prior on the stellar mass from a dynamically calibrated K S–M * relation, we determine R …
High dust content of a quiescent galaxy at z 2 revealed by deep ALMA observation
Übler, Hannah; Steidel, Charles C.; Price, Sedona H. +9 more
We report the detection of cold dust in an apparently quiescent massive galaxy (log (M⋆/M⊙) ≈ 11) at z ~ 2 (G4). The source is identified as a serendipitous 2 mm continuum source in a deep ALMA observation within the field of Q2343-BX610, a z = 2.21 massive star-forming disc galaxy. Available multiband photometry of G4 sugges…
Updated Catalog of Kepler Planet Candidates: Focus on Accuracy and Orbital Periods
Lissauer, Jack J.; Rowe, Jason F.; Jontof-Hutter, Daniel +5 more
We present a new catalog of Kepler planet candidates that prioritizes accuracy of planetary dispositions and properties over uniformity. This catalog contains 4376 transiting planet candidates, including 1791 residing within 709 multiplanet systems, and provides the best parameters available for a large sample of Kepler planet candidates. We also …