Search Publications
The Robustness of Synthetic Observations in Producing Observed Core Properties: Predictions for the TolTEC Clouds to Cores Legacy Survey
Wilson, G.; Gutermuth, R.; Pokhrel, R. +3 more
We use hydrodynamical simulations of star-forming gas with stellar feedback and sink particles-proxies for young stellar objects (YSOs)-to produce and analyze synthetic 1.1 mm continuum observations at different distances (150-1000 pc) and ages (0.49-1.27 Myr). We characterize how the inferred core properties, including mass, size, and clustering …
Mass Segregation as a New Indicator of Binary, IMBH, and Stellar-mass Black Hole Systems in Globular Clusters
Zhao, Gang; Wu, Wenbo
This study presents the mass segregation of 35 Galactic globular clusters (GCs) through the radial profile of the mean mass of main-sequence stars. Most of them are found to be mass segregated due to two-body relaxation effects. The GCs with a larger core to half-mass-radius ratio tend to be less mass segregated. Recent simulations show that energ…
VZ Sex: X-Ray Confirmation of Its Intermediate Polar Nature
Nucita, A. A.; De Paolis, F.; Ingrosso, G. +3 more
Intermediate polars are members of the cataclysmic variable binary stars. They are characterized by a moderately magnetized white dwarf accreting matter from a cool main-sequence companion star. In many cases, this accretion gives rise to a detectable X-ray emission. VZ Sex is an interesting X-ray source whose nature needs a robust confirmation. H…
V488 Per Revisited: No Strong Mid-infrared Emission Features and No Evidence for Stellar/substellar Companions
Howard, Andrew W.; Zuckerman, B.; Song, Inseok +4 more
We present characterization of the planetary system architecture for V488 Per, the dustiest main-sequence star known with a fractional infrared luminosity of ≈16%. Far-infrared imaging photometry confirms the existence of an outer planetary system dust population with a blackbody-fit temperature of ≈130 K. Mid-infrared spectroscopy probing the pre…
Broad-velocity-width Molecular Features in the Galactic Plane
Oka, Tomoharu; Tsujimoto, Shiho; Iwata, Yuhei +2 more
We performed a systematic search for broad-velocity-width molecular features (BVFs) in the disk part of our Galaxy by using the CO J = 1-0 survey data obtained with the Nobeyama Radio Observatory 45 m telescope. From this search, 58 BVFs were identified. In comparisons with the infrared and radio continuum images, 36 BVFs appeared to have both inf…
Say Hello to Algol's New Companion Candidates
Jetsu, Lauri
Constant orbital period ephemerides of eclipsing binaries give the computed eclipse epochs (C). These ephemerides based on the old data cannot accurately predict the observed future eclipse epochs (O). Predictability can be improved by removing linear or quadratic trends from the O - C data. Additional companions in an eclipsing binary system caus…
Numerical Study of Two Injection Methods for the 2007 November 15 Coronal Mass Ejection in the Inner Heliosphere
Shen, Fang; Feng, Xueshang; Zhang, Man +1 more
In this paper, we use two injection methods, i.e., coronal mass ejection (CME) with and without radial compression, to investigate the propagation of the 2007 November 15 CME in the inner heliosphere with a three-dimensional, time-dependent, numerical magnetohydrodynamic model. In order to reproduce the large-scale interplanetary magnetic field as…
Spatially Highly Resolved Solar-wind-induced Magnetic Field on Venus
He, Maosheng; Vogt, Joachim; Zhang, Tielong +2 more
The current work investigates the Venusian solar-wind-induced magnetosphere at a high spatial resolution using all Venus Express (VEX) magnetic observations through an unbiased statistical method. We first evaluate the predictability of the interplanetary magnetic field (IMF) during VEX's Venusian magnetospheric transits and then map the induced f…
Detection of H2 in the TWA 7 System: A Probable Circumstellar Origin
France, Kevin; Johns-Krull, Christopher M.; Carpenter, John M. +4 more
Using HST-COS far-UV spectra, we have discovered warm molecular hydrogen in the TWA 7 system. TWA 7, a ~9 Myr old M2.5 star, has a cold debris disk and has previously shown no signs of accretion. Molecular hydrogen is expected to be extremely rare in a debris disk. While molecular hydrogen can be produced in starspots or the lower chromospheres of…
Spitzer Mid-infrared Study of Sh 2-208: Evolution of Protoplanetary Disks in Low-metallicity Environments
Yasui, Chikako
This study presents sensitive mid-infrared (MIR) photometry obtained with the Spitzer/IRAC for a young cluster in Sh 2-208 (S208) located in one of the lowest-metallicity H II regions in the Galaxy, $[{\rm{O}}/{\rm{H}}]=-0.8$ dex. Previous studies suggested that the cluster is ~0.5 Myr old and has a distance of D = 4 kpc, which is consistent with …