Search Publications
Expanding Bipolar X-Ray Structure After the 2006 Eruption of RS Oph
Mukai, K.; Sokoloski, J. L.; Luna, G. J. M. +2 more
We report on the detection and analysis of extended X-ray emission by the Chandra X-ray Observatory stemming from the 2006 eruption of the recurrent nova RS Oph. The extended emission was detected 1254 and 1927 days after the start of the 2006 eruption and is consistent with a bipolar flow oriented in the East-West direction of the sky with openin…
Quasars with Proper Motions and the Link to Double and Multiple AGNs
Secrest, Nathan J.; Makarov, Valeri V.
Gaia used a large sample of photometrically selected active galactic nuclei (AGNs) and quasars to remove the residual spin of its global proper motion system in order to achieve a maximally inertial reference frame. A small fraction of these reference objects have statistically significant astrometric proper motions in Gaia EDR3. We compile a sour…
Mixing Interstellar Clouds Surrounding the Sun
Zank, Gary P.; Redfield, Seth; Winslow, Réka M. +9 more
On its journey through the Galaxy, the Sun passes through diverse regions of the interstellar medium. High-resolution spectroscopic measurements of interstellar absorption lines in spectra of nearby stars show absorption components from more than a dozen warm partially ionized clouds within 15 pc of the Sun. The two nearest clouds-the Local Inters…
Kepler-167e as a Probe of the Formation Histories of Cold Giants with Inner Super-Earths
Knutson, Heather A.; Fulton, Benjamin J.; Howard, Andrew W. +6 more
The observed correlation between outer giant planets and inner super-Earths is emerging as an important constraint on planet formation theories. In this study, we focus on Kepler-167, which is currently the only system known to contain both inner transiting super-Earths and a confirmed outer transiting gas giant companion beyond 1 au. Using long-t…
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…