Search Publications
Photometric and spectroscopic monitoring of YSOs in nearby star-forming regions - I. Eruptive YSOs
Herczeg, Gregory J.; Jose, Jessy; Johnstone, Doug +7 more
Mid-infrared (mid-IR) variability in young stellar objects (YSOs) is driven by several physical mechanisms, which produce a variety of amplitudes and light-curve shapes. One of these mechanisms, variable disc accretion, is predicted by models of episodic accretion to drive secular variability, including in the mid-IR. Because the largest accretion…
Evidence of external reconnection between an erupting mini-filament and ambient loops observed by Solar Orbiter/EUI
Barczynski, K.; Peter, H.; Chitta, L. P. +16 more
Mini-filament eruptions are one of the most common small-scale transients in the solar atmosphere. However, their eruption mechanisms are still not understood thoroughly. Here, with a combination of 174 Å images of high spatio-temporal resolution taken by the Extreme Ultraviolet Imager on board Solar Orbiter and images of the Atmospheric Imaging A…
GlobULeS. IV. UVIT/AstroSat Detection of Extremely Low Mass White Dwarf Companions to Blue Straggler Stars in NGC 362
Dattatrey, Arvind K.; Yadav, R. K. S.; Sahu, Snehalata +4 more
We report the discovery of extremely low mass white dwarfs (ELM WDs) as a companion of blue straggler stars (BSSs) in the Galactic globular cluster NGC 362 using images from AstroSat's Ultra Violet Imaging Telescope (UVIT). Spectral energy distributions (SEDs) for 26 far-UV (FUV) bright member BSSs are created using data from the UVIT, the UltraVi…
New insights into the rotational evolution of near-solar age stars from the open cluster M 67
Gruner, D.; Barnes, S. A.; Weingrill, J.
Context. Gyrochronology allows the derivation of ages for cool main sequence stars from their observed rotation periods and masses, or a suitable proxy of the latter. It is increasingly well explored for FGK stars, but requires further measurements for older ages and K-M-type stars.
Aims: Recent work has shown that the behavior of stellar spi…
Joint analysis of gravitational-wave and electromagnetic data of mergers: breaking an afterglow model degeneracy in GW170817 and in future events
Gianfagna, Giulia; Piro, Luigi; Pannarale, Francesco +4 more
On 2017 August 17, Advanced LIGO and Virgo observed GW170817, the first gravitational-wave (GW) signal from a binary neutron star merger. It was followed by a short-duration gamma-ray burst, GRB 170817A, and by a non-thermal afterglow emission. In this work, a combined simultaneous fit of the electromagnetic (EM, specifically, afterglow) and GW do…
Prospects from TESS and Gaia to Constrain the Flatness of Planetary Systems
Zhu, Wei; Espinoza-Retamal, Juan I.; Petrovich, Cristobal
The mutual inclination between planets orbiting the same star provides key information to understand the formation and evolution of multiplanet systems. In this work, we investigate the potential of Gaia astrometry in detecting and characterizing cold Jupiters in orbits exterior to the currently known Transiting Exoplanet Survey Satellite (TESS) p…
The ESO-VLT MIKiS Survey Reloaded: Exploring the Internal Kinematics of NGC 6440
Vesperini, Enrico; Cadelano, Mario; Pallanca, Cristina +7 more
In the context of the ESO-VLT Multi-Instrument Kinematic Survey of Galactic globular clusters, here we present the line-of-sight velocity dispersion profile of NGC 6440, a massive globular cluster located in the Galactic bulge. By combining the data acquired with four different spectrographs, we obtained the radial velocity of a sample of ~1800 in…
Spectroscopy of CASSOWARY gravitationally lensed galaxies in SDSS: characterization of an extremely bright reionization-era analogue at z = 1.42
Stark, Daniel P.; Ellis, Richard S.; Rigby, Jane R. +3 more
We present new observations of 16 bright (r = 19-21) gravitationally lensed galaxies at z ≃ 1-3 selected from the CASSOWARY survey. Included in our sample is the z = 1.42 galaxy CSWA-141, one of the brightest known reionization-era analogues at high redshift (g = 20.5), with a large specific star formation rate (31.2 Gyr-1) and an [O II…
The formation pathways of compact elliptical galaxies
Forbes, Duncan A.; Drinkwater, Michael J.; Bekki, Kenji +3 more
Compact elliptical (cE) galaxies remain an elusively difficult galaxy class to study. Recent observations have suggested that isolated and host-associated cEs have different formation pathways, while simulation studies have also shown different pathways can lead to a cE galaxy. However, a solid link has not been established, and the relative contr…
A New Galaxy Cluster Merger Capable of Probing Dark Matter: A56
Finner, Kyle; Wittman, David; Stancioli, Rodrigo +3 more
We report the discovery of a binary galaxy cluster merger via a search of the redMaPPer optical cluster catalog, with a projected separation of 535 kpc between the brightest cluster galaxies (BCGs). Archival XMM-Newton spectro-imaging reveals a gas peak between the BCGs, suggesting a recent pericenter passage. We conduct a galaxy redshift survey t…