Search Publications
Eclipse Timing the Milky Way's Gravitational Potential
Huber, Daniel; Chang, Philip; Stevens, Daniel J. +4 more
We show that a small but measurable shift in the eclipse midpoint time of eclipsing binary (EBs) stars of ~0.1 s over a decade baseline can be used to directly measure the Galactic acceleration of stars in the Milky Way at ~kiloparsec distances from the Sun. We consider contributions to the period drift rate from dynamical mechanisms other than th…
Probing Multiphase Gas in Local Massive Elliptical Galaxies via Multiwavelength Observations
Simionescu, A.; Gaspari, M.; Amblard, A. +6 more
We investigate the cold and warm gas content, kinematics, and spatial distribution of six local massive elliptical galaxies to probe the origin of the multiphase gas in their atmospheres. We report new observations, including Stratospheric Observatory for Infrared Astronomy [C II], Atacama Large Millimeter/submillimeter Array CO, Multi Unit Spectr…
SPYGLASS. III. The Fornax-Horologium Association and Its Traceback History within the Austral Complex
Bedding, Timothy R.; Murphy, Simon J.; Rizzuto, Aaron C. +3 more
The study of young associations is essential for building a complete record of local star formation processes. The Fornax-Horologium association (FH), including the χ 1 Fornacis cluster, represents one of the nearest young stellar populations to the Sun. This association has recently been linked to the Tuc-Hor, Carina, and Columba assoc…
Expanding the Time Domain of Multiple Populations: Evidence of Nitrogen Variations in the 1.5 Gyr Old Star Cluster NGC 1783
Cadelano, Mario; Dalessandro, Emanuele; Salaris, Maurizio +5 more
We present the result of a detailed analysis of Hubble Space Telescope UV and optical deep images of the massive and young (~1.5 Gyr) stellar cluster NGC 1783 in the Large Magellanic Cloud. This system does not show evidence of multiple populations (MPs) along the red giant branch (RGB) stars. However, we find that the cluster main sequence (MS) s…
The R-Process Alliance: Abundance Universality among Some Elements at and between the First and Second R-Process Peaks
Beers, Timothy C.; Placco, Vinicius M.; Holmbeck, Erika M. +11 more
We present new observational benchmarks of rapid neutron-capture process (r-process) nucleosynthesis for elements at and between the first (A ~ 80) and second (A ~ 130) peaks. Our analysis is based on archival ultraviolet and optical spectroscopy of eight metal-poor stars with Se (Z = 34) or Te (Z = 52) detections, whose r-process enhancement vari…
V1298 Tau with TESS: Updated Ephemerides, Radii, and Period Constraints from a Second Transit of V1298 Tau e
Foreman-Mackey, Daniel; Livingston, John H.; Montet, Benjamin T. +3 more
V1298 Tau is a young (20-30 Myr) solar-mass K star hosting four transiting exoplanets with sizes between 0.5 and 0.9 R J. Given the system's youth, it provides a unique opportunity to understand the evolution of planetary radii at different separations in the same stellar environment. V1298 Tau was originally observed 6 yr ago during K2…
Light-curve Evolution of the Nearest Tidal Disruption Event: A Late-time, Radio-only Flare
Yuan, Qiang; Perlman, Eric S.; Meyer, Eileen T. +7 more
Tidal disruption events (TDEs) occur when a star passes close enough to a galaxy's supermassive black hole to be disrupted by tidal forces. We discuss new observations of IGRJ12580+0134, a TDE observed in NGC 4845 (d = 17 Mpc) in 2010 November, with the Karl G. Jansky Very Large Array (VLA 9 9 The National Radio Astronomy Obs…
The Unmixed Debris of Gaia-Sausage/Enceladus in the Form of a Pair of Halo Stellar Overdensities
Chiappini, Cristina; Limberg, Guilherme; Rossi, Silvia +5 more
In the first billion years after its formation, the Galaxy underwent several mergers with dwarf satellites of various masses. The debris of Gaia-Sausage/Enceladus (GSE), the galaxy responsible for the last significant merger of the Milky Way, dominates the inner halo and has been suggested to be the progenitor of both the Hercules-Aquila Cloud (HA…
Discovery of Three Candidate Magnetar-powered Fast X-Ray Transients from Chandra Archival Data
Berger, Edo; Lin, Dacheng; Irwin, Jimmy A. +1 more
It was proposed that a remnant stable magnetar could be formed in a binary neutron-star merger, leading to a fast X-ray transient (FXT) that can last for thousands of seconds. Recently, Xue et al. suggested that CDF-S XT2 was exactly such a kind of source. If confirmed, such emission can be used to search for electromagnetic counterparts to gravit…
The Kiloparsec-scale Neutral Atomic Carbon Outflow in the Nearby Type 2 Seyfert Galaxy NGC 1068: Evidence for Negative AGN Feedback
Tamura, Yoichi; Kohno, Kotaro; Schinnerer, Eva +13 more
Active galactic nucleus (AGN) feedback is postulated as a key mechanism for regulating star formation within galaxies. Studying the physical properties of the outflowing gas from AGNs is thus crucial for understanding the coevolution of galaxies and supermassive black holes. Here we report 55 pc resolution ALMA neutral atomic carbon [C I] 3