Search Publications
A 3D View of Orion. I. Barnard's Loop
Alves, João; Bally, John; Zucker, Catherine +11 more
Barnard's Loop is a famous arc of Hα emission located in the Orion star-forming region. Here, we provide evidence of a possible formation mechanism for Barnard's Loop and compare our results with recent work suggesting a major feedback event occurred in the region around 6 Myr ago. We present a 3D model of the large-scale Orion region, indicating …
On the role of dust and mass-loss in the extended main sequence turnoff of star clusters: the case of NGC 1783
Milone, A. P.; Cordoni, G.; Marino, A. F. +6 more
The colour-magnitude diagram (CMD) morphology of the 'extended' main sequence turnoff (eMSTO) and upper main sequence (MS) of the intermediate age (≲ 2 Gyr) Large Magellanic Cloud Cluster NGC 1783 shows the presence of a small group of UV-dim stars, that, in the ultraviolet Hubble Space Telescope filters, are located at colours on the red side of …
The Pristine survey - XIX. Cu and Zn abundances in metal-poor giants
Salvadori, S.; Bonifacio, P.; Caffau, E. +14 more
Metal-poor stars formed from a gas enriched by the ejecta of the explosion of one/few generations of first massive stars. With the Pristine photometry combined with the Gaia data, we selected a sample of bright giants metal-poor candidates to be observed at high resolution. Of the 43 stars observed, 36 were confirmed to be metal-poor, supporting t…
Modeling a Coronal Mass Ejection from an Extended Filament Channel. II. Interplanetary Propagation to 1 au
Scolini, Camilla; Lynch, Benjamin J.; Palmerio, Erika +5 more
We present observations and modeling results of the propagation and impact at Earth of a high-latitude, extended filament channel eruption that commenced on 2015 July 9. The coronal mass ejection (CME) that resulted from the filament eruption was associated with a moderate disturbance at Earth. This event could be classified as a so-called "proble…
Supervised machine learning on Galactic filaments. Revealing the filamentary structure of the Galactic interstellar medium
Arzoumanian, D.; Zavagno, A.; Elia, D. +11 more
Context. Filaments are ubiquitous in the Galaxy, and they host star formation. Detecting them in a reliable way is therefore key towards our understanding of the star formation process.
Aims: We explore whether supervised machine learning can identify filamentary structures on the whole Galactic plane.
Methods: We used two versions of UN…
A Candidate Relativistic Tidal Disruption Event at 340 Mpc
Chandra, Poonam; Hallinan, Gregg; Laha, Sibasish +13 more
We present observations of an extreme radio flare, VT J024345.70-284040.08, hereafter VT J0243, from the nucleus of a galaxy with evidence for historic Seyfert activity at redshift z = 0.074. Between NRAO Very Large Array (VLA) Sky Survey observations in 1993 to VLA Sky Survey observations in 2018, VT J0243 rose from a ~ GHz radio luminosity of ν …
Global survey of star clusters in the Milky Way. VII. Tidal parameters and mass function
Kovaleva, D. A.; Piskunov, A. E.; Just, A. +2 more
Aims: We built Galactic open star cluster mass functions (CMFs) for different age sub-samples and spatial locations in the wider solar neighbourhood. Here, we present a simple cluster formation and evolution model to reproduce the main features of the CMFs.
Methods: We used an unbiased working sample of 2227 clusters of the Milky Way Sta…
An In-depth Look at TOI-3884b: A Super-Neptune Transiting an M4Dwarf with Persistent Starspot Crossings
Kobulnicky, Henry A.; Kowalski, Adam F.; Cochran, William D. +25 more
We perform an in-depth analysis of the recently validated TOI-3884 system, an M4-dwarf star with a transiting super-Neptune. Using high-precision light curves obtained with the 3.5 m Apache Point Observatory and radial velocity observations with the Habitable-zone Planet Finder, we derive a planetary mass of ${32.6}_{-7.4}^{+7.3}\,{M}_{\oplus }$ a…
North Polar Spur/Loop I: gigantic outskirt of the Northern Fermi bubble or nearby hot gas cavity blown by supernovae?
Lallement, Rosine
Radio continuum, microwave and gamma-ray images of the Milky Way reveal a conspicuous, loop-like structure that fills almost half of the northern Galactic hemisphere, called Loop I. The interior of Loop I is shining in soft X-rays, and its eastern base is a bright, elongated structure dubbed the North Polar Spur (NPS). After 40 years of debates, t…
Deciphering the unusual stellar progenitor of GRB 210704A
Troja, E.; Im, M.; Butler, N. R. +16 more
GRB 210704A is a burst of intermediate duration (T90 ~ 1-4 s) followed by a fading afterglow and an optical excess that peaked about 7 d after the explosion. Its properties, and in particular those of the excess, do not easily fit into the well-established classification scheme of gamma-ray bursts (GRBs) as being long or short, leaving …