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Phase Modeling of the TRAPPIST-1 Planetary Atmospheres
Kane, Stephen R.; Fauchez, Thomas; Selsis, Franck +2 more
Transiting compact multiplanet systems provide many unique opportunities to characterize the planets, including studies of size distributions, mean densities, orbital dynamics, and atmospheric compositions. The relatively short orbital periods in these systems ensure that events requiring specific orbital locations of the planets (such as primary …
A Weakening Compton Hump and Soft X-Ray Excess Detected in the Seyfert 1 Galaxy MCG -02-58-22
Laha, Sibasish; Ghosh, Ritesh
We have carried out an extensive X-ray spectral study of the bare Seyfert 1 galaxy MCG -02-58-22 to ascertain the nature of the X-ray reprocessing media using observations from Suzaku (2009) and simultaneous observations from XMM-Newton and NuSTAR (2016). The most significant results of our investigation are as follows. (1) The primary X-ray emiss…
Broadband Modeling of Low-luminosity Active Galactic Nuclei Detected in Gamma Rays
Prince, Raj; Tomar, Gunjan; Gupta, Nayantara
Low-luminosity active galactic nuclei are more abundant and closer to us than the luminous ones but harder to explore as they are faint. We have selected the four sources, NGC 315, NGC 4261, NGC 1275, and NGC 4486, which have been detected in γ-rays by Fermi-LAT. We have compiled their long-term radio, optical, X-ray data from different telescopes…
Properties of the C II 1334 Å Line in Coronal Hole and Quiet Sun as Observed by IRIS
Tripathi, Durgesh; Upendran, Vishal
Coronal holes (CHs) have subdued intensity and net blueshifts when compared to the quiet Sun (QS) at coronal temperatures. At transition region temperatures, such differences are obtained for regions with identical absolute photospheric magnetic flux density (∣B∣). In this work, we use spectroscopic measurements of the C II 1334 Å line from the In…
The Cusp Plasma Imaging Detector (CuPID) CubeSat Observatory: Mission Overview
Thomas, N.; Porter, F. S.; Kuntz, K. D. +28 more
The Cusp Plasma Imaging detector (CuPID) Cube Satellite Observatory is a six unit Cube Satellite developed to study macroscale properties of dayside magnetopause reconnection. Reconnection will be studied through imaging spatial and temporal ion dispersion signatures in the magnetospheric cusps. As reconnection enables shocked solar wind plasma to…
DIISC-II: Unveiling the Connections between Star Formation and Interstellar Medium in the Extended Ultraviolet Disk of NGC 3344
Heckman, Timothy; Kennicutt, Robert C.; Thilker, David +6 more
We present our investigation of the extended ultraviolet (XUV) disk galaxy, NGC 3344, conducted as part of Deciphering the Interplay between the Interstellar medium, Stars, and the Circumgalactic medium survey. We use surface and aperture photometry of individual young stellar complexes to study star formation and its effect on the physical proper…
Anomalous Stellar Populations in Low-surface-brightness Galaxies
Schombert, James; McGaugh, Stacy
We present new Hubble Space Telescope WFC3 near-IR observations of the color-magnitude diagrams (CMDs) in two low-surface-brightness galaxies, F575-3 and F615-1, notable for having no current star formation based on a lack of Hα emission. Key features of the near-IR CMDs are resolved, such as the red giant branch (RGB), the asymptotic giant branch…
Reaching the Oldest Stars beyond the Local Group: Ancient Star Formation in UGC 4483
Aloisi, Alessandra; Cignoni, Michele; Sacchi, Elena +9 more
We present new WFC3/UVIS observations of UGC 4483, the closest example of a metal-poor blue compact dwarf galaxy, with a metallicity of Z ≃ 1/15 Z⊙ and located at a distance of D ≃ 3.4 Mpc. The extremely high quality of our new data allows us to clearly resolve the multiple stellar evolutionary phases populating the color-magnitude diag…
Evidence for widespread glaciation in Arcadia Planitia, Mars
Osinski, Gordon R.; Golombek, Matthew P.; Williams, Nathan R. +2 more
Viscous flow features, including lobate debris aprons and lineated valley fill, are common ice-related features found across the mid-latitudes of Mars. These features are commonly found along the dichotomy boundary and around massifs where snow and ice can accumulate and flow to topographic lows during periods of higher obliquity. We have identifi…
X-Ray Binaries in M51 I: Catalog and Statistics
Chandar, Rupali; Rangelov, Blagoy; Prestwich, Andrea +3 more
We used archival data from the Chandra X-ray Observatory (Chandra) and the Hubble Space Telescope, to identify 334 candidate X-ray binary systems and their potential optical counterparts in the interacting galaxy pair NGC 5194/5195 (M51). We present the catalog and data analysis of X-ray and optical properties for those sources, from the deep 892 …