Search Publications
Direct Constraints on the Extremely Metal-poor Massive Stars Underlying Nebular C IV Emission from Ultra-deep HST/COS Ultraviolet Spectroscopy
Charlot, Stéphane; Chevallard, Jacopo; Sanders, Ryan L. +8 more
Metal-poor nearby galaxies hosting massive stars have a fundamental role to play in our understanding of both high-redshift galaxies and low-metallicity stellar populations. But while much attention has been focused on their bright nebular gas emission, the massive stars that power it remain challenging to constrain. Here we present exceptionally …
HST Strong-lensing Model for the First JWST Galaxy Cluster SMACS J0723.3-7327
Zitrin, Adi; Furtak, Lukas J.; Meena, Ashish K. +1 more
On 2022 July 8, NASA shared (https://www.nasa.gov/feature/goddard/2022/nasa-shares-list-of-cosmic-targets-for-webb-telescope-s-first-images) the list of five public showcase targets that have been observed with the new James Webb Space Telescope (JWST) and whose data-at the time of writing-are expected to be released to the public around Tuesday, …
Early JWST Imaging Reveals Strong Optical and NIR Color Gradients in Galaxies at z 2 Driven Mostly by Dust
van Dokkum, Pieter; Heintz, Kasper E.; Bezanson, Rachel +7 more
Recent studies have shown that galaxies at cosmic noon are redder in the center and bluer in the outskirts, mirroring results in the local universe. These color gradients could be caused by gradients in either the stellar age or dust opacity; however, distinguishing between these two causes is impossible with rest-frame optical photometry alone. H…
Discovery of a Double-detonation Thermonuclear Supernova Progenitor
Green, Matthew J.; Rusholme, Ben; Bellm, Eric C. +12 more
We present the discovery of a new double-detonation progenitor system consisting of a hot subdwarf B (sdB) binary with a white dwarf companion with a P orb = 76.34179(2) minutes orbital period. Spectroscopic observations are consistent with an sdB star during helium core burning residing on the extreme horizontal branch. Chimera light c…
Constraints on the Spindown of Fully Convective M Dwarfs Using Wide Field Binaries
Winters, Jennifer G.; Irwin, Jonathan M.; Charbonneau, David +1 more
M dwarfs remain active over longer timescales than their Sunlike counterparts, with potentially devastating implications for the atmospheres of their planets. However, the age at which fully convective M dwarfs transition from active and rapidly rotating to quiescent and slowly rotating is poorly understood, as these stars remain rapidly rotating …
GOALS-JWST: Resolving the Circumnuclear Gas Dynamics in NGC 7469 in the Mid-infrared
Inami, Hanae; Böker, Torsten; Law, David R. +35 more
The nearby, luminous infrared galaxy NGC 7469 hosts a Seyfert nucleus with a circumnuclear star-forming ring and is thus the ideal local laboratory for investigating the starburst-AGN (active galactic nucleus) connection in detail. We present integral-field observations of the central 1.3 kpc region in NGC 7469 obtained with the JWST Mid-InfraRed …
Testing White Dwarf Age Estimates Using Wide Double White Dwarf Binaries from Gaia EDR3
Hermes, J. J.; van Saders, Jennifer L.; El-Badry, Kareem +4 more
White dwarf (WD) stars evolve simply and predictably, making them reliable age indicators. However, self-consistent validation of the methods for determining WD total ages has yet to be widely performed. This work uses 1565 wide (>100 au) WD+WD binaries and 24 new triples containing at least two WDs to test the accuracy and validity of WD total…
Rotation Distributions around the Kraft Break with TESS and Kepler: The Influences of Age, Metallicity, and Binarity
Pan, Kaike; van Saders, Jennifer L.; Claytor, Zachary R. +6 more
Stellar rotation is a complex function of mass, metallicity, and age and can be altered by binarity. To understand the importance of these parameters in main-sequence stars, we have assembled a sample of observations that spans a range of these parameters using a combination of observations from The Transiting Exoplanet Survey Satellite (TESS) and…
The ELM Survey. IX. A Complete Sample of Low-mass White Dwarf Binaries in the SDSS Footprint
Gianninas, A.; Kilic, Mukremin; Kosakowski, Alekzander +1 more
We present the discovery of 17 double white dwarf (WD) binaries from our ongoing search for extremely low mass (ELM) < 0.3 M ⊙ WDs, objects that form from binary evolution. Gaia parallax provides a new means of target selection that we use to evaluate our original ELM Survey selection criteria. Cross-matching the Gaia and Sloan Digit…
The Gas-Star Formation Cycle in Nearby Star-forming Galaxies. II. Resolved Distributions of CO and Hα Emission for 49 PHANGS Galaxies
Kruijssen, J. M. Diederik; Rosolowsky, Erik; Chevance, Mélanie +36 more
The relative distribution of molecular gas and star formation in galaxies gives insight into the physical processes and timescales of the cycle between gas and stars. In this work, we track the relative spatial configuration of CO and Hα emission at high resolution in each of our galaxy targets and use these measurements to quantify the distributi…