Search Publications
A global investigation of wrinkle ridge formation events; Implications towards the thermal evolution of Mars
Ruj, Trishit; Kawai, Kenji
Wrinkle ridges (WR) are well-established paleo-stress indicators providing information on the compressional history and thermal evolution of Mars. Therefore, constraining their timing of formation on a global scale could yield better insight into the tectonic history, evolution of the mantle, and the paleoclimate of the planet. Here, we have updat…
A principal component analysis of polycyclic aromatic hydrocarbon emission in NGC 2023
Cami, Jan; Peeters, Els; Sidhu, Ameek +1 more
We use the measured fluxes of polycyclic aromatic hydrocarbon (PAH) emission features at 6.2, 7.7, 8.6, 11.0, and 11.2 µm in the reflection nebula NGC 2023 to carry out a principal component analysis (PCA) as a means to study previously reported variations in the PAH emission. We find that almost all of the variations (99 per cent) can be ex…
Infrared spectropolarimetric detection of intrinsic polarization from a core-collapse supernova
Tinyanont, Samaporn; Leonard, Douglas C.; De, Kishalay +8 more
Massive stars die an explosive death as a core-collapse supernova (CCSN). The exact physical processes that cause the collapsing star to rebound into an explosion are not well understood1-3, and the key to resolving this issue may lie in the measurement of the shape of CCSNe ejecta. Spectropolarimetry is the only way to perform this mea…
KCWI Observations of the Extended Nebulae in Mrk 273
Leung, Gene C. K.; Coil, Alison L.; Perrotta, Serena +1 more
Ultraluminous infrared galaxies (ULIRGs) represent a critical stage in the merger-driven evolution of galaxies when active galactic nucleus (AGN) activity is common and AGN feedback is expected. We present high-sensitivity and large field-of-view integral field spectroscopy of the ULIRG Mrk 273 using new data from the Keck Cosmic Web Imager (KWCI)…
Three faint-source microlensing planets detected via the resonant-caustic channel
Han, Cheongho; Udalski, Andrzej; Lee, Chung-Uk +32 more
Aims: We conducted a project of reinvestigating the 2017-2019 microlensing data collected by high-cadence surveys with the aim of finding planets that were missed due to the deviations of planetary signals from the typical form of short-term anomalies.
Methods: The project led us to find three planets, KMT-2017-BLG-2509Lb, OGLE-2017-BLG-…
HAWC+/SOFIA Polarimetry in L1688: Relative Orientation of Magnetic Field and Elongated Cloud Structure
Kwon, Woojin; Fissel, Laura M.; Li, Di +14 more
We present a study of the relative orientation between the magnetic field and elongated cloud structures for the ρ Oph A and ρ Oph E regions in L1688 in the Ophiuchus molecular cloud. Combining inferred magnetic field orientation from HAWC+ 154 µm observations of polarized thermal emission with column density maps created using Herschel subm…
Blue extreme disk-runaway stars with Gaia EDR3
Raddi, Roberto; Irrgang, Andreas; Heber, Ulrich +1 more
Since the discovery of hypervelocity stars in 2005, it has been widely believed that only the disruption of a binary system by a supermassive black hole at the Galactic center (GC), that is, the so-called Hills mechanism, is capable of accelerating stars to beyond the Galactic escape velocity. In the meantime, however, driven by the Gaia space mis…
A Kiloparsec-scale Molecular Wave in the Inner Galaxy: Feather of the Milky Way?
Csengeri, T.; Klessen, R. S.; Schilke, P. +7 more
We report the discovery of a velocity coherent, kiloparsec-scale molecular structure toward the Galactic center region with an angular extent of 30° and an aspect ratio of 60:1. The kinematic distance of the CO structure ranges between 4.4 and 6.5 kpc. Analysis of the velocity data and comparison with the existing spiral arm models support that a …
Spectroscopic and photometric analysis of symbiotic candidates - I. Ten candidates on classical symbiotic stars
Merc, J.; Gális, R.; Wolf, M. +10 more
Symbiotic stars belong to a group of interacting binaries that display a wide variety of phenomena, including prominent outbursts connected with mass transfer, as well as stellar winds, jets, eclipses, or intrinsic variability of the components. Dozens of new symbiotic stars and candidates have been discovered in recent years. However, there are m…
AGB Interlopers in YSO Catalogs Hunted out by NEOWISE
Byun, Do-Young; Johnstone, Doug; Lee, Jeong-Eun +7 more
Asymptotic giant branch stars (AGBs) and young stellar objects (YSOs) often share the same domains in infrared (IR) color-magnitude or color-color diagrams leading to potential misclassification. We extracted a list of AGB interlopers from the published YSO catalogs using the periodogram analysis on the Near-Earth Object Wide Infrared Survey Explo…