Search Publications
Impacts of Bar-driven Shear and Shocks on Star Formation
Park, Myeong-Gu; Fragkoudi, Francesca; van de Ven, Glenn +12 more
Bars drive gas inflow. As the gas flows inward, shocks and shear occur along the bar dust lanes. Such shocks and shear can affect the star formation (SF) and change the gas properties. For four barred galaxies, we present Hα velocity gradient maps that highlight bar-driven shocks and shear using data from the PHANGS-MUSE and PHANGS-ALMA surveys, w…
Retrieval of Thermally Resolved Water Vapor Distributions in Disks Observed with JWST-MIRI
Banzatti, Andrea; Wilner, David J.; Andrews, Sean M. +13 more
The mid-infrared water vapor emission spectrum provides a novel way to characterize the delivery of icy pebbles toward the innermost (<5 au) regions of planet-forming disks. Recently, JWST MIRI-MRS showed that compact disks exhibit an excess of low-energy water vapor emission relative to extended multigapped disks, suggesting that icy pebble dr…
tdescore: An Accurate Photometric Classifier for Tidal Disruption Events
Rusholme, Ben; Sollerman, Jesper; van Velzen, Sjoert +12 more
Optical surveys have become increasingly adept at identifying candidate tidal disruption events (TDEs) in large numbers, but classifying these generally requires extensive spectroscopic resources. Here we present tdescore, a simple binary photometric classifier that is trained using a systematic census of ∼3000 nuclear transients from the Zwicky T…
Flaring Stars in a Nontargeted Millimeter-wave Survey with SPT-3G
Ade, P. A. R.; Benabed, K.; Bouchet, F. R. +96 more
We present a flare star catalog from 4 yr of nontargeted millimeter-wave survey data from the South Pole Telescope (SPT). The data were taken with the SPT-3G camera and cover a 1500 deg2 region of the sky from 20h40m0s to 3h20m0s in right ascension and from ‑42° to ‑70° i…
The Ice Chemistry in Comets and Planet-forming Disks: Statistical Comparison of CH3OH, H2CO, and NH3 Abundance Ratios
Ceccarelli, Cecilia; Codella, Claudio; Villanueva, Geronimo L. +5 more
Comets are frozen remnants of our solar system's formation, and comparing their chemical composition to that of planet-forming systems can reveal crucial insights about our origins, potentially answering one of the most challenging questions in planetary science, i.e., whether cometary material was mainly inherited from the protosolar nebula or re…
GRB 240529A: A Tale of Two Shocks
Fang, Min; Liu, Hao; Liu, Wei +66 more
Thanks to the rapidly increasing time-domain facilities, we are entering a golden era of research on gamma-ray bursts (GRBs). In this Letter, we report our observations of GRB 240529A with the Burst Optical Observer and Transient Exploring System, the 1.5 m telescope at Observatorio de Sierra Nevada, the 2.5 m Wide Field Survey Telescope of China,…
New Insights into the Internal Structure of GJ 1214 b Informed by JWST
Eastman, Jason D.; Bean, Jacob L.; Zhang, Michael +7 more
Recent JWST observations of the sub-Neptune GJ 1214 b suggest that it hosts a high-metallicity (≳100× solar), hazy atmosphere. Emission spectra of the planet show molecular absorption features, most likely due to atmospheric H2O. In light of this new information, we conduct a thorough reevaluation of the planet's internal structure. We …
Stellar Evolution in Real Time. II. R Hydrae and an Open-Source Grid of >3000 Seismic TP-AGB Models Computed with MESA
Tayar, Jamie; Joyce, Meridith; Molnár, László +3 more
We present a comprehensive characterization of the evolved thermally pulsing asymptotic giant branch (TP-AGB) star R Hydrae (R Hya), building on the techniques applied in Stellar Evolution in Real Time I (Molnár et al.) to T Ursae Minoris. We compute over 3000 theoretical TP-AGB pulse spectra using MESA and the corresponding oscillation spectra wi…
Methods for Incorporating Model Uncertainty into Exoplanet Atmospheric Analysis
McGill, Peter; Kempton, Eliza M. -R.; Nixon, Matthew C. +1 more
A key goal of exoplanet spectroscopy is to measure atmospheric properties, such as abundances of chemical species, in order to connect them to our understanding of atmospheric physics and planet formation. In this new era of high-quality JWST data, it is paramount that these measurement methods are robust. When comparing atmospheric models to obse…
Filamentary Network and Magnetic Field Structures Revealed with BISTRO in the High-mass Star-forming Region NGC 2264: Global Properties and Local Magnetogravitational Configurations
Zhang, Yapeng; Pattle, Kate; Karoly, Janik +154 more
We report 850 µm continuum polarization observations toward the filamentary high-mass star-forming region NGC 2264, taken as part of the B-fields In STar forming Regions Observations large program on the James Clerk Maxwell Telescope. These data reveal a well-structured nonuniform magnetic field in the NGC 2264C and 2264D regions with a prev…