Search Publications
Missions
Journals
Publication Years
High-resolution Extinction Map in the Direction of the Bulge Globular Cluster NGC 6440
Pallanca, Cristina; Ferraro, Francesco R.; Lanzoni, Barbara +3 more
We used optical images acquired with the UVIS channel of the Wide Field Camera 3 on board the Hubble Space Telescope to construct the first high-resolution extinction map in the direction of NGC 6440, a globular cluster located in the bulge of our Galaxy. The map has a spatial resolution of 0.″5 over a rectangular region of about 160″ × 240″ aroun…
On the Relation Between Transition Region Network Jets and Coronal Plumes
Fu, Hui; Li, Bo; Xia, Lidong +5 more
Both coronal plumes and network jets are rooted in network lanes. The relationship between the two, however, has yet to be addressed. For this purpose, we perform an observational analysis using images acquired on 2015 December 4 with the Atmospheric Imaging Assembly (AIA) 171 Å passband to follow the evolution of coronal plumes, the observations …
An X-Ray + Radio Search for Massive Black Holes in Blue Compact Dwarf Galaxies
Reines, Amy E.; Latimer, Lilikoi J.; Plotkin, Richard M. +2 more
Nearby blue compact dwarf (BCD) galaxies are arguably our best local analogs of galaxies in the earlier universe that may host relics of black hole (BH) seeds. Here we present high-resolution Chandra X-ray Observatory and Karl G. Jansky Very Large Array observations of five nearby BCDs with stellar masses of less than the Small Magellanic Cloud (M…
Dusty disk winds at the sublimation rim of the highly inclined, low mass young stellar object SU Aurigae
Monnier, John D.; Kraus, Stefan; Baron, Fabien +11 more
Context. T Tauri stars are low-mass young stars whose disks provide the setting for planet formation. Despite this, their structure is poorly understood. We present new infrared interferometric observations of the SU Aurigae circumstellar environment that offer resolution that is three times higher and a better baseline position angle coverage tha…
Eigenfunctions of Galactic phase space spirals from dynamic mode decomposition
Widrow, Lawrence M.; Darling, Keir
We investigate the spatiotemporal structure of simulations of the homogeneous slab and isothermal plane models for the vertical motion in the Galactic disc. We use dynamic mode decomposition (DMD) to compute eigenfunctions of the simulated distribution functions for both models, referred to as DMD modes. In the case of the homogeneous slab, we com…
K2-161b: a low-density super-Neptune on an eccentric orbit
Jones, M. I.; Cortés, C.; Rabus, M. +15 more
We report the discovery of K2-161b, which was first identified as a planetary candidate from Kepler K2 photometry of Campaign 14, and whose planetary nature and orbital parameters were then confirmed with precision radial velocities. K2-161b is half as massive as Saturn (M_P= 0.179 ± 0.021 MJ), and has a radius of R_P= 0.840 ± 0.011 R_J…
WASP-180Ab: Doppler tomography of a hot Jupiter orbiting the primary star in a visual binary
Bouchy, F.; Queloz, D.; Ségransan, D. +26 more
We report the discovery and characterization of WASP-180Ab, a hot Jupiter confirmed by the detection of its Doppler shadow and by measuring its mass using radial velocities. We find the 0.9 ± 0.1 MJup, 1.24 ± 0.04 RJup planet to be in a misaligned, retrograde orbit around an F7 star with Teff = 6500 K and a moderat…
Carbonaceous nano-dust emission in proto-planetary discs: the aliphatic-aromatic components
Ysard, N.; Dartois, E.; Habart, E. +3 more
Context. In the interstellar medium, carbon (nano-)grains are a major component of interstellar dust. This solid phase is more vulnerable to processing and destruction than its silicate counterpart. It exhibits a complex, size-dependent evolution that is due to interactions within different radiative and dynamical environments. Infrared signatures…
Studying the physical properties of tidal features - I. Extracting morphological substructure in CANDELS observations and VELA simulations
Bell, Eric F.; Ferguson, Henry C.; Hathi, Nimish P. +17 more
The role of major mergers in galaxy evolution remains a key open question. Existing empirical merger identification methods use non-parametric and subjective visual classifications that can pose systematic challenges to constraining merger histories. As a first step towards overcoming these challenges, we develop and share publicly a new PYTHON-ba…
Evidence for Optically Thick, Eddington-limited Winds Driven by Supercritical Accretion
Feng, Hua; Ho, Luis C.; Yao, Yuhan +1 more
Supercritical accretion onto compact objects powers a massive wind that is optically thick and Eddington-limited. If most of the hard X-rays from the central disk are obscured by the wind, the source will display a blackbody-like spectrum with a luminosity scaled with the mass of the compact object. From the Chandra archive of nearby galaxies, we …