Search Publications
Star Formation in the Dwarf Seyfert Galaxy NGC 4395: Evidence for Both AGN and SN Feedback?
Stalin, C. S.; Nandi, Payel; Saikia, D. J. +5 more
We present a detailed multiwavelength study of star formation in the dwarf galaxy NGC 4395, which hosts an active galactic nucleus (AGN). From our observations with the Ultra-Violet Imaging Telescope, we have compiled a catalog of 284 star-forming (SF) regions, out of which we could detect 120 SF regions in Hα observations. Across the entire galax…
Multithermal Jet Formation Triggered by Flux Emergence
Li, Xiaohong; Keppens, Rony; Zhou, Yuhao
Flux emergence is responsible for various solar eruptions. Combining observation and simulations, we investigate the influence of flux emergence at one footpoint of an arcade on coronal rain as well as induced eruptions. The emergence changes the pressure in the loops, and the internal coronal rain all moves to the other side. The emerging flux re…
Investigating the amplitude and rotation of the phase spiral in the Milky Way outer disc
McMillan, P. J.; Bensby, T.; Alinder, S.
Context. With data releases from the astrometric space mission Gaia, exploration of the structure of the Milky Way is now possible in unprecedented detail, and has unveiled many previously unknown structures in the Galactic disc and halo. One such feature is the Gaia phase spiral where the stars in the Galactic disc form a spiral density pattern i…
Comparison of a pebbles-based model with the observed evolution of the water and carbon dioxide outgassing of comet 67P/Churyumov-Gerasimenko
Fulle, M.; Mottola, S.; Bockelée-Morvan, D. +11 more
The Rosetta mission escorted comet 67P/Churyumov-Gerasimenko for approximately two years including the perihelion passage (1.24 au, 2015 August), allowing us to monitor the seasonal evolution of the water and carbon dioxide loss rates. Here, we model 67P/Churyumov-Gerasimenko water and carbon dioxide production as measured by the Rosina experiment…
The GAPS Programme at TNG. XLVII. A conundrum resolved: HIP 66074b/Gaia-3b characterised as a massive giant planet on a quasi-face-on and extremely elongated orbit
Scandariato, G.; Pagano, I.; Marzari, F. +37 more
The nearby mid-K dwarf HIP 66074 was recently identified as host to a candidate super-Jupiter companion on a ∼300 day, almost edge-on, orbit, based on Gaia Data Release 3 (DR3) astrometry. Initial attempts at confirming the planetary nature of the signal based on publicly available radial-velocity (RV) observations uncovered an intriguing conundru…
Gas, dust, and the CO-to-molecular gas conversion factor in low-metallicity starbursts
Menten, K. M.; Hunt, L. K.; Ginolfi, M. +19 more
The factor relating CO emission to molecular hydrogen column density, XCO, is still subject to uncertainty, in particular at low metallicity. In this paper, to quantify XCO at two different spatial resolutions, we exploited a dust-based method together with ALMA 12-m and ACA data and H I maps of three nearby metal-poor starbu…
A planetary collision afterglow and transit of the resultant debris cloud
Mamajek, Eric; Kirkpatrick, J. Davy; Sainio, Arttu +19 more
Planets grow in rotating disks of dust and gas around forming stars, some of which can subsequently collide in giant impacts after the gas component is removed from the disk1-3. Monitoring programmes with the warm Spitzer mission have recorded substantial and rapid changes in mid-infrared output for several stars, interpreted as variati…
Evidence for Low-level Dynamical Excitation in Near-resonant Exoplanet Systems
Butler, R. Paul; Jordán, Andrés; Brahm, Rafael +18 more
The geometries of near-resonant planetary systems offer a relatively pristine window into the initial conditions of exoplanet systems. Given that near-resonant systems have likely experienced minimal dynamical disruptions, the spin-orbit orientations of these systems inform the typical outcomes of quiescent planet formation, as well as the primord…
IC 5146 Dark Streamer: The First Reliable Candidate of Edge Collapse, Hub-filament Systems, and Intertwined Sub-filaments
Men'shchikov, A.; Dewangan, L. K.; Baug, T. +5 more
The paper presents an analysis of multiwavelength data of a nearby star-forming site, the IC 5146 dark streamer (d ~ 600 pc), which has been treated as a single and long filament, fl. Two hub-filament systems (HFSs) are known to exist toward the eastern and the western ends of fl. Earlier published results favor simultaneous evidence of HFSs and e…
Model-independent Mass Reconstruction of the Hubble Frontier Field Clusters with MARS Based on Self-consistent Strong-lensing Data
Jee, M. James; Cha, Sangjun
We present a new strong-lensing (SL) mass reconstruction of the six Hubble Frontier Fields (HFF) clusters with the MAximum-entropy ReconStruction (MARS) algorithm. MARS is a new free-form inversion method, which suppresses spurious small-scale fluctuations while achieving excellent convergence in positions of multiple images. For each HFF cluster,…