Search Publications
Properties of Density and Velocity Gaps Induced by a Planet in a Protoplanetary Disk
Han, Cheongho; Bae, Jaehan; Kim, Woong-Tae +1 more
Gravitational interactions between a protoplanetary disk and its embedded planet are one of the formation mechanisms of gaps and rings found in recent ALMA observations. To quantify the gap properties measured in not only surface density but also rotational velocity profiles, we run two-dimensional hydrodynamic simulations of protoplanetary disks …
Observations of Type Ia Supernova 2014J for Nearly 900 Days and Constraints on Its Progenitor System
Wang, Lifan; Elias-Rosa, Nancy; Benetti, Stefano +18 more
We present extensive ground-based and Hubble Space Telescope (HST) photometry of the highly reddened, very nearby SN Ia 2014J in M82, covering the phases from 9 days before to about 900 days after the B-band maximum. SN 2014J is similar to other normal SNe Ia near the maximum light, but it shows flux excess in the B band in the early nebular phase…
The Inner Disk and Accretion Flow of the Close Binary DQ Tau
Gutermuth, Robert; Muzerolle, James; Flaherty, Kevin +2 more
We present multiepoch optical and near-infrared (NIR) photometry and spectroscopy of the spectroscopic binary T Tauri star DQ Tau. The photometric monitoring, obtained using SMARTS ANDICAM, recovers the previously seen correlation between optical flux and the 15.8 day binary orbital period, with blue flux peaks occurring close to most observed per…
The OSIRIS Lens-amplified Survey (OLAS). I. Dynamical Effects of Stellar Feedback in Low-mass Galaxies at z ∼ 2
Treu, Tommaso; Bradač, Maruša; Wang, Xin +6 more
We introduce the OSIRIS Lens-Amplified Survey (OLAS), a kinematic survey of gravitationally lensed galaxies at cosmic noon taken with Keck adaptive optics. In this paper, we present spatially resolved spectroscopy and nebular emission kinematic maps for 17 star-forming galaxies with stellar masses 8 < log(M */M ⊙) < 9.8…
Compton-thick AGNs in the NuSTAR Era. V. Joint NuSTAR and XMM-Newton Spectral Analysis of Three “Soft-gamma” Candidate CT-AGNs in the Swift/BAT 100-month Catalog
Comastri, A.; Ajello, M.; La Parola, V. +3 more
We present the joint NuSTAR and XMM-Newton spectral analysis in the 0.6-70 keV band of three candidate Compton-thick (CT-) active galactic nuclei (AGNs) selected in the 100-month Swift-BAT catalog. These objects were previously classified as CT-AGNs based on low-quality Swift-X-ray Telescope (XRT) and Swift-Burst Alert Telescope (BAT) data, and ha…
The Warm Gaseous Disk and the Anisotropic Circumgalactic Medium of the Milky Way
Bregman, Joel N.; Qu, Zhijie
Warm ({log}T≈ 5) gas is an important gaseous component in the galaxy baryonic cycle, which is important for understanding both gas accretion and galactic feedback processes. We built a two-dimensional disk-circumgalactic medium (CGM) model to study the warm gas distribution of the Milky Way (MW) using the absorption-line surveys of Si IV and O VI.…
Photometric Determination of the Mass Accretion Rates of Pre-main-sequence Stars. VI. The Case of LH 95 in the Large Magellanic Cloud
Panagia, Nino; Beccari, Giacomo; De Marchi, Guido +1 more
We report on the accretion properties of low-mass stars in the LH 95 association within the Large Magellanic Cloud. Using noncontemporaneous wideband optical and narrowband Hα photometry obtained with the Hubble Space Telescope, we identify 245 low-mass pre-main-sequence (PMS) candidates showing Hα excess emission above the 4σ level. We derive the…
A Search for Intermediate-separation Low-mass Binaries in the Orion Nebula Cluster
Reiter, Megan; Greenbaum, Alexandra; Meyer, Michael R. +3 more
We present the results of a binary population study in the Orion Nebula Cluster (ONC) using archival Hubble Space Telescope (HST) data obtained with the Advanced Camera for Surveys in Johnson V filter (HST Proposal 10246, PI M. Robberto). Young clusters and associations hold clues to the origin and properties of multiple star systems. Binaries wit…
Searching for the Donor Stars of ULX Pulsars
Harrison, F. A.; Stern, D.; Brightman, M. +3 more
We report on our search for the optical counterparts of two ultraluminous X-ray pulsars with known orbital periods, M82 X-2 and NGC 5907 X-1, in new and archival Hubble Space Telescope observations, in an effort to characterize the donor stars in these systems. We detect five near-infrared sources consistent with the position of M82 X-2 that are t…
The 3D Kinematics of Gas in the Small Magellanic Cloud
Murray, Claire E.; Peek, J. E. G.; McClure-Griffiths, N. M. +3 more
We investigate the kinematics of neutral gas in the Small Magellanic Cloud (SMC) and test the hypothesis that it is rotating in a disk. To trace the 3D motions of the neutral gas distribution, we identify a sample of young, massive stars embedded within it. These are stars with radial velocity measurements from spectroscopic surveys and proper mot…