Search Publications
INTEGRAL View on cataclysmic variables and symbiotic binaries
Doroshenko, Victor; de Martino, Domitilla; Falanga, Maurizio +5 more
Accreting white dwarfs (WDs) constitute a significant fraction of the hard X-ray sources detected by the INTEGRAL observatory. Most of them are magnetic Cataclysmic Variables (CVs) of the intermediate polar (IP) and polar types, but the contribution of the Nova-likes systems and the systems with optically thin boundary layers, Dwarf Novae (DNs) an…
A census of young stellar population associated with the Herbig Be star HD 200775
Mathew, Blesson; Manoj, P.; Lee, Chang Won +4 more
The region surrounding the well-known reflection nebula, NGC 7023, illuminated by a Herbig Be star, HD 200775, located in the dark cloud L1174 is studied in this work. Based on the distances and proper motion values from Gaia DR2 of 20 previously known young stellar object (YSO) candidates, we obtained a distance of 335 ± 11 pc to the cloud comple…
On the nature of the soft γ-ray emission in the hard state of the black hole transient GRS 1716-249
Motta, S. E.; Segreto, A.; Casella, P. +9 more
The black hole transient GRS 1716-249 was monitored from the radio to the γ-ray band during its 2016-2017 outburst. This paper focuses on the spectral energy distribution (SED) obtained in 2017 February-March, when GRS 1716-249 was in a bright hard spectral state. The soft γ-ray data collected with the INTEGRAL/SPI telescope show the presence of a…
A Statistical Search for Star-Planet Interaction in the Ultraviolet Using GALEX
Mathew, Blesson; Manoj, P.; Kartha, Sreeja S. +2 more
Most (∼82%) of the over 4000 confirmed exoplanets known today orbit very close to their host stars, within 0.5 au. Planets at such small orbital distances can result in significant interactions with their host stars, which can induce increased activity levels in them. In this work, we have searched for statistical evidence for star-planet interact…
Magnetohydrodynamic Turbulent Evolution of a Magnetic Cloud in the Outer Heliosphere
Telloni, Daniele; Zank, Gary P.; Adhikari, Laxman +8 more
This Letter exploits joint observations of the same interplanetary coronal mass ejection by widely separated spacecraft to study, for the first time, the turbulent evolution of the magnetohydrodynamic (MHD) properties of the embedded magnetic cloud, during its propagation throughout interplanetary space. Specifically, the event was observed by Win…
Mirror, mirror on the outflow cavity wall. Near-infrared CO overtone disc emission of the high-mass YSO IRAS 11101-5829
Stecklum, B.; Coffey, D.; Natta, A. +7 more
Aims: The inner regions of high-mass protostars are often invisible in the near-infrared, obscured by thick envelopes and discs. We aim to investigate the inner gaseous disc of IRAS 11101-5829 through scattered light from the outflow cavity walls.
Methods: We observed the immediate environment of the high-mass young stellar object IRAS 1…
On the Correlation between L Dwarf Optical and Infrared Variability and Radio Aurorae
Richey-Yowell, Tyler; Kao, Melodie M.; Pineda, J. Sebastian +2 more
Photometric variability attributed to cloud phenomena is common in L/T transition brown dwarfs. Recent studies show that such variability may also trace aurorae, suggesting that localized magnetic heating may contribute to observed brown dwarf photometric variability. We assess this potential correlation with a survey of 17 photometrically variabl…
Observation and Modeling of High-temperature Solar Active Region Emission during the High-resolution Coronal Imager Flight of 2018 May 29
Golub, Leon; Winebarger, Amy R.; Warren, Harry P. +15 more
Excellent coordinated observations of NOAA active region 12712 were obtained during the flight of the High-resolution Coronal Imager (Hi-C) sounding rocket on 2018 May 29. This region displayed a typical active region core structure with relatively short, high-temperature loops crossing the polarity inversion line and bright "moss" located at the …
Evidence of Particle Acceleration in the Superbubble 30 Doradus C with NuSTAR
Auchettl, Katie; Madsen, Kristin K.; Grefenstette, Brian W. +2 more
We present evidence of diffuse, non-thermal X-ray emission from the superbubble 30 Doradus C (30 Dor C) using hard X-ray images and spectra from NuSTAR observations. For this analysis, we utilize data from a 200 ks targeted observation of 30 Dor C as well as 2.8 Ms of serendipitous off-axis observations from the monitoring of nearby SN 1987A. The …
The observational impact of dust trapping in self-gravitating discs
Cadman, James; Hall, Cassandra; Rice, Ken +2 more
We present a 3D semi-analytical model of self-gravitating discs, and include a prescription for dust trapping in the disc spiral arms. Using Monte Carlo radiative transfer, we produce synthetic ALMA (Atacama Large Millimeter/submillimeter Array) observations of these discs. In doing so, we demonstrate that our model is capable of producing observa…