Search Publications
The Direct Detection and Characterization of M-dwarf Planets Using Light Echoes
White, Richard L.; Sparks, William B.; Ford, Holland C. +1 more
Exoplanets orbiting M-dwarf stars are a prime target in the search for life in the universe. M-dwarf stars are active, with powerful flares that could adversely impact prospects for life, though there are counter-arguments. Here, we turn flaring to advantage and describe ways in which it can be used to enhance the detectability of planets, in the …
A Search for H I Lyα Counterparts to Ultrafast X-Ray Outflows
Kriss, Gerard A.; Lee, Julia C.; Danehkar, Ashkbiz
Prompted by the H I Lyα absorption associated with the X-ray ultrafast outflow at -17,300 km s-1 in the quasar PG 1211+143, we have searched archival UV spectra at the expected locations of H I Lyα absorption for a large sample of ultrafast outflows identified in XMM-Newton and Suzaku observations. Sixteen of the X-ray outflows have pre…
Does the Compact Radio Jet in PG 1700+518 Drive a Molecular Outflow?
Rupke, David S. N.; Gültekin, Kayhan; Runnoe, Jessie C.
Radio jets play an important role in quasar feedback, but direct observations showing how the jets interact with the multi-phase interstellar medium of galaxy disks are few and far between. In this work, we provide new millimeter interferometric observations of PG 1700+518 in order to investigate the effect of its radio jet on the surrounding mole…
Galaxy Ellipticity Measurements in the Near-infrared for Weak Lensing
Wright, Edward L.; Chary, Ranga-Ram; Lee, Bomee
We investigate the value of the near-infrared imaging from upcoming surveys for constraining the ellipticities of galaxies. We select galaxies between 0.5 ≤ z < 3 that are brighter than expected Euclid sensitivity limits from the GOODS-S and N fields in CANDELS. The co-added CANDELS/HST V+I and J+H images are degraded in resolution and sensitiv…
Inner Source C+/O+ Pickup Ions Produced by Solar Wind Recycling, Neutralization, Backscattering, Sputtering, and Sputtering-induced Recycling
Möbius, E.; Schwadron, N. A.; Berger, L. +2 more
Inner source pickup ions (PUIs) are believed to be created by the interaction between the solar wind and interplanetary dust grains. The production mechanism, however, is not well understood. We use the Stopping Range of Ions in Matter and Energetic Particle Radiation Environment Module to simulate the production and transport of inner source C
A Spatially Resolved Study of X-Ray Properties in Superbubble 30 Dor C with XMM-Newton
Matsumoto, Hironori; Fukui, Yasuo; Sano, Hidetoshi +4 more
We carry out a spatially resolved spectral analysis with a physical scale of ∼10 pc in X-ray for the superbubble 30 Dor C, which has the largest diameter of ∼80 pc and the brightest non-thermal emission in superbubbles, for the first time. We aim at investigating spatial variation of the physical properties of non-thermal emission as detected in s…
Constraining the Gap Size in the Disk around HD 100546 in the Mid-infrared
Henning, Thomas; van Boekel, Roy; Panić, Olja +6 more
We refine the gap size measurements of the disk surrounding the Herbig Ae star HD 100546 in the N band. Our new mid-infrared interferometric (MIDI) data have been taken with the UT baselines and span the full range of orientations. The correlated fluxes show a wavy pattern in which the minima separation links to a geometrical structure in the disk…
Effect of Upstream ULF Waves on the Energetic Ion Diffusion at the Earth’s Foreshock. II. Observations
Dandouras, Iannis; Matsukiyo, Shuichi; Kis, Arpad +5 more
This study reports observations of energetic ions upstream of the Earth’s quasi-parallel bow shock by Cluster at times when interspacecraft separation distances were large. We analyze two individual upstream ion events during high solar wind velocity conditions to compare the spatial evolution of partial energetic ion densities in front of the Ear…
A Subarcsecond Near-infrared View of Massive Galaxies at z > 1 with Gemini Multi-conjugate Adaptive Optics
Surace, J. A.; Farrah, D.; Vaccari, M. +14 more
We present images taken using the Gemini South Adaptive Optics Imager (GSAOI) with the Gemini Multi-conjugate Adaptive Optics System (GeMS) in three 2 arcmin2 fields in the Spitzer Extragalactic Representative Volume Survey. These GeMS/GSAOI observations are among the first ≈0.″1 resolution data in the near-infrared spanning extragalact…
The Lives of Stars: Insights from the TGAS-RAVE-LAMOST Data Set
Smith, Martin C.; Vickers, John J.
In this paper, we investigate how the chemical and kinematic properties of stars vary as a function of age. Using data from a variety of photometric, astrometric, and spectroscopic surveys, we calculate the ages, phase space information, and orbits for ∼125,000 stars covering a wide range of stellar parameters. We find indications that the inner r…