Search Publications
Detached Shell Carbon Stars: Tracing Thermal Pulses on the Asymptotic Giant Branch
Kastner, Joel H.; Wilson, Emily
We consider whether the subset of carbon-rich asymptotic giant branch (AGB) stars that exhibit detached, expanding circumstellar shells may reveal the past histories of these stars as having undergone helium shell flashes (thermal pulses) on the AGB. We exploit newly available Gaia parallaxes and photometry, along with archival infrared photometry…
Validation of HD 183579b Using Archival Radial Velocities: A Warm Neptune Orbiting a Bright Solar Analog
Kipping, David; Palatnick, Skyler; Yahalomi, Daniel
As exoplanetary science matures into its third decade, we are increasingly offered the possibility of pre-existing, archival observations for newly detected candidates. This is particularly poignant for the TESS mission, whose survey spans bright, nearby dwarf stars in both hemispheres—precisely the types of sources targeted by previous radial vel…
The Double-bubble Coronal Mass Ejection of the 2020 December 14 Total Solar Eclipse
Druckmüller, Miloslav; Boe, Benjamin; Habbal, Shadia +1 more
Total solar eclipses (TSEs) continue to provide an invaluable platform for exploring the magnetic topology of the solar corona and for studying dynamic events such as coronal mass ejections (CMEs)with a higher spatial resolution over a larger spatially continuous extent than is possible to achieve with any other method at present. In this Letter, …
The JCMT BISTRO-2 Survey: The Magnetic Field in the Center of the Rosette Molecular Cloud
Pattle, Kate; Karoly, Janik; Ward-Thompson, Derek +33 more
We present the first 850 µm polarization observations in the most active star-forming site of the Rosette Molecular Cloud (d ∼ 1.6 kpc) in the wall of the Rosette Nebula, imaged with the SCUBA-2/POL-2 instruments of the James Clerk Maxwell telescope, as part of the B-Fields In Star-forming Region Observations 2 (BISTRO-2) survey. From the PO…
Constraining Progenitors of Observed Low-mass X-ray Binaries Using Convection and Rotation-Boosted Magnetic Braking
Van, Kenny X.; Ivanova, Natalia
We present a new method for constraining the mass transfer evolution of low-mass X-ray binaries (LMXBs)-a reverse population synthesis technique. This is done using the detailed 1D stellar evolution code MESA (Modules for Experiments in Stellar Astrophysics) to evolve a high-resolution grid of binary systems spanning a comprehensive range of initi…
Elemental Abundances of the Hot Atmosphere of Luminous Infrared Galaxy Arp 299
Fukazawa, Yasushi; Gu, Liyi; Zhou, Ping +8 more
Hot atmospheres of massive galaxies are enriched with metals. Elemental abundances measured in the X-ray band have been used to study the chemical enrichment of supernova remnants, elliptical galaxies, groups, and clusters of galaxies. Here we measure the elemental abundances of the hot atmosphere of luminous infrared galaxy Arp 299 observed with …
Chandra Observations of Abell 2261 Brightest Cluster Galaxy, a Candidate Host to a Recoiling Black Hole
Lauer, Tod R.; Ogle, Patrick; Postman, Marc +4 more
We use Chandra X-ray observations to look for evidence of a recoiling black hole from the brightest cluster galaxy in Abell 2261 (A2261-BCG). A2261-BCG is a strong candidate for a recoiling black hole because of its large, flat stellar core, revealed by Hubble Space Telescope imaging observations. We took 100 ks observations with Chandra and combi…
Radiative Transfer Modeling of an SN 1987A Light Echo-AT 2019xis
Wang, Lifan; Brown, Peter; Ding, Jiachen +1 more
We use a Monte Carlo radiative transfer model (MCRTM) to simulate the UBVRI light curves, images, and linear polarization of a light echo from supernova SN 1987A in the Large Magellanic Cloud (LMC) using various dust cloud shapes, sizes, and optical properties. We compare the theoretical simulations to the observations of AT 2019xis, a light echo …
Fresh Insights on the Kinematics of M49's Globular Cluster System with MMT/Hectospec Spectroscopy
Zhang, Hongxin; Liu, Chengze; Zabludoff, Ann +10 more
We present the first results of an MMT/Hectospec campaign to measure the kinematics of globular clusters (GCs) around M49-the brightest galaxy in the Virgo galaxy cluster, which dominates the Virgo B subcluster. The data include kinematic tracers beyond 95 kpc (~5.2 effective radii) for M49 for the first time, enabling us to achieve three key insi…
Chemically Fresh Gas Inflows Detected in a Nearby High-mass Star-forming Region
Kim, Kee-Tae; Liu, Tie; Mei, Ying +9 more
We report the detection of a chemically fresh inflow that is feeding high-mass young-stellar-object (HMYSO) growth in the nearby high-mass star-forming region G352.63 made with both the Atacama Large Millimeter/submillimeter Array (ALMA) and the Submillimeter Array (SMA). High-quality images of the dust and molecular lines from both ALMA and SMA h…