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A Global and Seasonal Perspective of Martian Water Vapor From ExoMars/NOMAD
Aoki, S.; Vandaele, A. C.; Daerden, F. +18 more
Slightly less than a Martian Year of nominal science (March 2018-January 2020) with the ExoMars Trace Gas Orbiter has furthered the ongoing investigation of dayside water vapor column abundance. These dayside observations span latitudes between 75°S and 75°N, and all longitudes, which can provide global snapshots of the total water column abundanc…
An approximate analytic solution to the coupled problems of coronal heating and solar-wind acceleration
Chandran, Benjamin D. G.
Between the base of the solar corona at $r=r_\textrm {b}$ and the Alfvén critical point at $r=r_\textrm {A}$, where $r$ is heliocentric distance, the solar-wind density decreases by a factor $ \mathop > \limits_∼ 10^5$, but the plasma temperature varies by a factor of only a few. In this paper, I show that such quasi-isothermal evolution out to…
Optical spectroscopy of Galactic field classical Be stars
Mathew, Blesson; Paul, K. T.; Subramaniam, Annapurni +3 more
In this study, we analyse the emission lines of different species present in 118 Galactic field classical Be stars in the wavelength range of 3800-9000 Å. We re-estimated the extinction parameter (AV) for our sample stars using the newly available data from Gaia DR2 and suggest that it is important to consider AV while measur…
A Broadband X-Ray View of the Precessing Accretion Disk and Pre-eclipse Dip in the Pulsar Her X-1 with NuSTAR and XMM-Newton
Pottschmidt, Katja; Staubert, Rüdiger; Wilms, Jörn +5 more
We present a broadband X-ray timing study of the variations in pulse behavior with the superorbital cycle in the low-mass X-ray binary Her X-1. This source shows a 35 day superorbital modulation in X-ray flux that is likely caused by occultation by a warped, precessing accretion disk. Our data set consists of four joint XMM-Newton and NuSTAR obser…
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…