Search Publications
A Multi-instrument Study of the 2018 Hard-state-only Outburst of H1743-322
Stiele, H.; Kong, A. K. H.
Distinct changes of the spectral and variability properties observed in black hole transients during a bright outburst deliver insight into the evolution of the accretion flow and accretion geometry. We investigated NICER and Swift monitoring observations of H 1743-322 during its 2018 outburst as well as NuSTAR and XMM-Newton data. The observed ha…
The Encounter of the Parker Solar Probe and a Comet-like Object Near the Sun: Model Predictions and Measurements
Zong, Qiugang; He, Jiansen; Ip, Wing-Huen +15 more
The Parker Solar Probe (PSP) aims to explore the nascent solar wind close to the Sun. Meanwhile, PSP is also expected to encounter small objects like comets and asteroids. In this work, we survey the ephemerides to find the chance of a recent encounter and then model the interaction between released dusty plasmas and solar wind plasmas. On 2019 Se…
Winds in the Lower Cloud Level on the Nightside of Venus from VIRTIS-M (Venus Express) 1.74 µm Images
Khatuntsev, Igor V.; Patsaeva, Marina V.; Zasova, Ludmila V. +2 more
ALMA Observation of the Protoplanetary Disk around WW Cha: Faint Double-peaked Ring and Asymmetric Structure
Dong, Ruobing; Kataoka, Akimasa; Takami, Michihiro +13 more
We present Atacama Large Millimeter/submillimeter Array (ALMA) Band 6 observations of dust continuum emission of the disk around WW Cha. The dust continuum image shows a smooth disk structure with a faint (low-contrast) dust ring, extending from ∼40 au to ∼70 au, not accompanied by any gap. We constructed the simple model to fit the visibility of …
Spatially-resolved stellar population properties of the M51-NGC 5195 system from multi-wavelength photometric data
Kong, Xu; Zou, Hu; Lin, Lin +5 more
Using multi-band photometric images of M51 and its companion NGC 5195 from ultraviolet to optical and infrared, we investigate spatially resolved stellar population properties of this interacting system with stellar population synthesis models. The observed infrared excess (IRX) is used to constrain dust extinction. Stellar mass is also inferred f…
A Search for Cloud Cores Affected by Shocked Carbon Chain Chemistry in L1251
Kim, Kee-Tae; Xu, Y.; Li, D. +26 more
We searched for shocked carbon chain chemistry (SCCC) sources with C3S abundances surpassing those of HC5N toward the dark cloud L1251, using the Effelsberg telescope at the K band (18-26 GHz). L1251-1 and L1251-3 are identified as the most promising SCCC sources. The two sources harbor young stellar objects. We conducted map…
Photometric Classifications of Evolved Massive Stars: Preparing for the Era of Webb and Roman with Machine Learning
Davenport, James R. A.; Dorn-Wallenstein, Trevor Z.; Levesque, Emily M. +1 more
In the coming years, next-generation space-based infrared observatories will significantly increase our samples of rare massive stars, representing a tremendous opportunity to leverage modern statistical tools and methods to test massive stellar evolution in entirely new environments. Such work is only possible if the observed objects can be relia…
Globular Cluster Systems of Massive Compact Elliptical Galaxies in the Local Universe: Evidence for Relic Red Nuggets?
Lee, Myung Gyoon; Kang, Jisu
Nearby massive compact elliptical galaxies (MCEGs) are strong candidates for relic galaxies (i.e., local analogs of red nuggets at high redshifts). It is expected that the globular cluster (GC) systems of relic galaxies are dominated by red (metal-rich) GCs. NGC 1277 is known as a unique example of such a galaxy in the previous study. In this stud…
On the origin of the Kreutz family of sungrazing comets
Lemos, Pablo; Fernández, Julio A.; Gallardo, Tabaré
We evaluate numerically three different models for the parent comet of the Kreutz family of sungrazers: (i) A Centaur on a highly inclined or retrograde orbit that diffuse to the inner planetary region where it became a sungrazer (Model 1). (ii) A parent comet injected from the Oort cloud straight into a near-parabolic, sungrazing orbit. Near peri…
Tectonic Deformation and Volatile Loss in the Formation of Noctis Labyrinthus, Mars
Kling, Corbin L.; Byrne, Paul K.; Wegmann, Karl W. +1 more
Noctis Labyrinthus is a little-studied and structurally complex area situated between the Tharsis Rise and Valles Marineris on Mars. Noctis Labyrinthus is dissected by normal faults that form horst and graben, pit craters situated inside the graben, and large troughs that cross-cut both graben and pit craters. Mass wasting, periglacial, and some e…