Search Publications
Comprehensive Analysis of HD 105, A Young Solar System Analog
Marshall, J. P.; del Burgo, C.; Ertel, S. +5 more
HD 105 is a nearby, pre-main-sequence G0 star hosting a moderately bright debris disk (L dust/L ⋆ ∼ 2.6 × 10-4). The star and its surroundings might therefore be considered an analog of the young solar system. We refine the stellar parameters based on an improved Gaia parallax distance and identify it as a pre-main…
Importance of the Hα Visibility and Projection Effects for the Interpretation of Prominence Fine-structure Observations
Heinzel, Petr; Aulanier, Guillaume; Schmieder, Brigitte +2 more
We construct a new 3D Whole-prominence Fine-structure (WPFS) model based on a prominence magnetic field configuration designed to qualitatively approximate the morphology of a quiescent prominence observed on 2010 June 22. The model represents an entire prominence with its numerous fine structures formed by a prominence plasma located in dips in t…
Reconnection Acceleration in Saturn’s Dayside Magnetodisk: A Multicase Study with Cassini
Coates, A. J.; Krupp, N.; Dougherty, M. K. +16 more
Recently, rotationally driven magnetic reconnection was first discovered in Saturn’s dayside magnetosphere. This newly confirmed process could potentially drive bursty phenomena at Saturn, i.e., pulsating energetic particles and auroral emissions. Using Cassini’s measurements of magnetic fields and charged particles, we investigate particle accele…
Spatially Resolved Dust, Gas, and Star Formation in the Dwarf Magellanic Irregular NGC 4449
Östlin, G.; Roussel, H.; Rosa González, D. +17 more
We investigate the relation between gas and star formation in subgalactic regions, ∼360 pc to ∼1.5 kpc in size, within the nearby starburst dwarf NGC 4449, in order to separate the underlying relation from the effects of sampling at varying spatial scales. Dust and gas mass surface densities are derived by combining new observations at 1.1 mm, obt…
The 12CO2 and 13CO2 Absorption Bands as Tracers of the Thermal History of Interstellar Icy Grain Mantles
Boogert, Adwin; He, Jiao; Emtiaz, SM +1 more
Analyses of infrared signatures of CO2 in water-dominated ices in the ISM can give information on the physical state of CO2 in icy grains and on the thermal history of the ices themselves. In many sources, CO2 was found in the “pure” crystalline form, as signatured by the splitting in the bending mode absorption pr…
Long-lived Protoplanetary Disks in Multiple Systems: The VLA View of HD 98800
Duchêne, Gaspard; Ribas, Álvaro; Espaillat, Catherine C. +1 more
The conditions and evolution of protoplanetary disks in multiple systems can be considerably different from those around single stars, which may have important consequences for planet formation. We present Very Large Array (VLA) 8.8 mm (34 GHz) and 5 cm (6 GHz) observations of the quadruple system HD 98800, which consists of two spectroscopic bina…
Detection of an Optical/UV Jet/Counterjet and Multiple Spectral Components in M84
Sparks, William B.; Georganopoulos, Markos; Chiaberge, Marco +3 more
We report an optical/UV jet and counterjet in M84, previously unreported in archival Hubble Space Telescope imaging. With archival VLA, ALMA, and Chandra imaging, we examine the first well-sampled spectral energy distribution of the inner jet of M84, where we find that multiple co-spatial spectral components are required. In particular, the ALMA d…
X-Ray Properties of AGN in Brightest Cluster Galaxies. I. A Systematic Study of the Chandra Archive in the 0.2 < z < 0.3 and 0.55 < z < 0.75 Redshift Range
Risaliti, Guido; Lusso, Elisabeta; Nardini, Emanuele +5 more
We present a search for nuclear X-ray emission in the brightest cluster galaxies (BCGs) of a sample of groups and clusters of galaxies extracted from the Chandra archive. The exquisite angular resolution of Chandra allows us to obtain robust photometry at the position of the BCG, and to firmly identify unresolved X-ray emission when present, thank…
Broadband X-Ray Spectral Analysis of the Double-nucleus Luminous Infrared Galaxy Mrk 463
Imanishi, Masatoshi; Tanimoto, Atsushi; Ueda, Yoshihiro +4 more
We present a broadband (0.4-70 keV) X-ray spectral analysis of the luminous infrared galaxy (LIRG) system Mrk 463 observed with Nuclear Spectroscopic Telescope Array (NuSTAR), Chandra, and XMM-Newton, which contains double active galactic nuclei (AGNs; Mrk 463E and Mrk 463W) with a separation of ∼3.8 kpc. Detecting their transmitted hard X-ray >…
Can a Bright and Energetic X-Ray Pulsar Be Hiding Amid the Debris of SN 1987A?
Esposito, Paolo; Rea, Nanda; Matsuura, Mikako +3 more
The mass of the stellar precursor of supernova (SN) 1987A and the burst of neutrinos observed at the moment of the explosion are consistent with the core-collapse formation of a neutron star. However, no compelling evidence for the presence of a compact object of any kind in SN 1987A has been found yet in any band of the electromagnetic spectrum, …