Search Publications
A Coplanar Circumbinary Protoplanetary Disk in the TWA 3 Triple M Dwarf System
Duchêne, Gaspard; Andrews, Sean M.; Czekala, Ian +5 more
We present sensitive ALMA observations of TWA 3, a nearby, young (∼10 Myr) hierarchical system composed of three pre-main-sequence M3-M4.5 stars. For the first time, we detected 12CO and 13CO J = 2-1 emissions from the circumbinary protoplanetary disk around TWA 3A. We jointly fit the protoplanetary disk velocity field, stell…
Luminous Late-time Radio Emission from Supernovae Detected by the Karl G. Jansky Very Large Array Sky Survey (VLASS)
Paterson, Kerry; Margutti, Raffaella; Terreran, Giacomo +10 more
We present a population of 19 radio-luminous supernovae (SNe) with emission reaching L ν ~ 1026-1029 erg s-1 Hz-1 in the first epoch of the Very Large Array Sky Survey (VLASS) at 2-4 GHz. Our sample includes one long gamma-ray burst, SN 2017iuk/GRB 171205A, and 18 core-collapse SNe detected …
A Catalog of Interplanetary Coronal Mass Ejections Observed by Juno between 1 and 5.4 au
Lugaz, Noé; Winslow, Réka M.; Möstl, Christian +2 more
We use magnetic field measurements by the Juno spacecraft to catalog and investigate interplanetary coronal mass ejections (ICMEs) beyond 1 au. During its cruise phase, Juno spent about 5 yr in the solar wind between 2011 September and 2016 June, providing measurements of the interplanetary magnetic field (IMF) between 1 and 5.4 au. Juno therefore…
Eclipsing the X-Ray Emitting Region in the Active Galaxy NGC 6814
Miller, Jon M.; Gallo, Luigi C.; Gonzalez, Adam G.
We report the detection of a rapid occultation event in the nearby Seyfert galaxy NGC 6814, simultaneously captured in a transient light curve and spectral variability. The intensity and hardness ratio curves capture distinct ingress and egress periods that are symmetric in duration. Independent of the selected continuum model, the changes can be …
Enhanced Localization of Transients Based on a Novel Cross-correlation Method
Huang, Y.; Zhang, S. N.; Zhao, Y. +12 more
Locating gamma-ray transients including gamma-ray bursts (GRBs) and soft gamma repeater (SGR) bursts is of great importance in multi-messenger and multi-wavelength astronomy, such as guiding optical and radio follow-up observations and evaluating the association of a GRB with a gravitational wave or an SGR with a galaxy or fast radio burst (FRB). …
Systematic Study of Acceleration Efficiency in Young Supernova Remnants with Nonthermal X-Ray Observations
Uchiyama, Yasunobu; Aharonian, Felix; Khangulyan, Dmitry +1 more
Cutoff energy in a synchrotron radiation spectrum of a supernova remnant (SNR) contains a key parameter of ongoing particle acceleration. We systematically analyze 11 young SNRs, including all historical SNRs, to measure the cutoff energy, thus shedding light on the nature of particle acceleration at the early stage of SNR evolution. The nontherma…
The Remnant and Origin of the Historical Supernova 1181 AD
Parker, Quentin A.; Ritter, Andreas; Guerrero, Martín A. +3 more
The guest star of AD 1181 is the only historical supernova of the past millennium that is without a definite counterpart. The previously proposed association with supernova remnant G130.7+3.1 (3C 58) is in strong doubt because of the inferred age of this remnant. Here we report a new identification of SN 1181 with our codiscovery of the hottest kn…
The Architecture of the V892 Tau System: The Binary and Its Circumbinary Disk
Henning, Thomas; Wilner, David J.; Kwon, Woojin +11 more
We present high-resolution millimeter continuum and CO line observations for the circumbinary disk around V892 Tau to constrain the stellar and disk properties. The total mass of the two near-equal-mass A stars is estimated to be 6.0 ± 0.2 M⊙ based on our models of the Keplerian-dominated gas disk rotation. The detection of strong ioniz…
NICER Detection of Thermal X-Ray Pulsations from the Massive Millisecond Pulsars PSR J0740+6620 and PSR J1614-2230
Bogdanov, Slavko; Ray, Paul S.; Wolff, Michael T. +11 more
We report the detection of X-ray pulsations from the rotation-powered millisecond-period pulsars PSR J0740+6620 and PSR J1614-2230, two of the most massive neutron stars known, using observations with the Neutron Star Interior Composition Explorer (NICER). We also analyze X-ray Multi-Mirror Mission (XMM-Newton) data for both pulsars to obtain thei…
Filament Rotation in the California L1482 Cloud
Klessen, R. S.; Stutz, A. M.; Law, C. Y. +5 more
We analyze the gas mass distribution, the gas kinematics, and the young stellar objects of the California Molecular Cloud L1482 filament. The mean Gaia DR2 YSO distance is ${511}_{-16}^{+17}$ pc. In terms of the gas, the line-mass (M/L) profiles are symmetric scale-free power laws consistent with cylindrical geometry. We calculate the gravitationa…