Search Publications
Four GRB supernovae at redshifts between 0.4 and 0.8. The bursts GRB 071112C, 111228A, 120714B, and 130831A
Greiner, J.; Klose, S.; Schady, P. +15 more
Twenty years ago, GRB 980425/SN 1998bw revealed that long gamma-ray bursts (GRBs) are physically associated with broad-lined type-Ic supernovae (SNe). Since then more than 1000 long GRBs have been localized to high angular precision, but only in ∼50 cases has the underlying SN component been identified. Using the Gamma-Ray Burst Optical Near-Infra…
The Impact of the Environment on the Early Stages of Radio Source Evolution
Ostorero, Luisa; Guainazzi, Matteo; Stawarz, Łukasz +4 more
Compact symmetric objects (CSOs) show radio features such as jets, lobes, and hot spots that are contained within the central 1 kpc region of their host galaxy. Thus, they are thought to be among the progenitors of large-scale radio galaxies. A debate regarding whether the CSOs are compact primarily because they are young or because they are surro…
An observational test for star formation prescriptions in cosmological hydrodynamical simulations
Buck, Tobias; Dutton, Aaron A.; Macciò, Andrea V.
State-of-the-art cosmological hydrodynamical simulations of galaxy formation have reached the point at which their outcomes result in galaxies with ever more realism. Still, the employed sub-grid models include several free parameters such as the density threshold, n, to localize the star-forming gas. In this work, we investigate the possibilities…
Runaway Young Stars near the Orion Nebula
Kounkel, Marina; McBride, Aidan
The star-forming region of the Orion Nebula (ONC) is ideal to study the stellar dynamics of young stars in a clustered environment. Using Gaia DR2 we search for pre-main sequence stars with unusually high proper motions that may be representative of a dynamical ejection from unstable young triple systems or other close three-body encounters. We id…
Revealing the Milky Way’s Hidden Circumgalactic Medium with the Cosmic Origins Spectrograph Quasar Database for Galactic Absorption Lines
Peek, J. E. G.; Zheng, Y.; Putman, M. E. +1 more
Every quasar (quasi-stellar object; QSO) spectrum contains absorption-line signatures from the interstellar medium, disk-halo interface, and circumgalactic medium (CGM) of the Milky Way (MW). We analyze Hubble Space Telescope/Cosmic Origins Spectrograph (COS) spectra of 132 QSOs to study the significance and origin of Si IV absorption at | {v}
An extreme amplitude, massive heartbeat system in the LMC characterized using ASAS-SN and TESS
Kochanek, C. S.; Stanek, K. Z.; Thompson, Todd A. +3 more
Using ASAS-SN data, we find that the bright (V∼ 13.5 mag) variable star MACHO 80.7443.1718 (ASASSN-V J052624.38-684705.6) is the most extreme heartbeat star yet discovered. This massive binary, consisting of at least one early B-type star, has an orbital period of P_ASAS-SN=32.83627± 0.00846 d, and is located towards the LH58 OB complex in the LMC…
Characteristics of a Gradual Filament Eruption and Subsequent CME Propagation in Relation to a Strong Geomagnetic Storm
Wang, Rui; Liu, Ying D.; Hu, Huidong +3 more
An unexpected strong geomagnetic storm occurred on 2018 August 26, which was caused by a slow coronal mass ejection (CME) from a gradual eruption of a large quiet-region filament. We investigate the eruption and propagation characteristics of this CME in relation to the strong geomagnetic storm with remote sensing and in situ observations. Coronal…
New transiting hot Jupiters discovered by WASP-South, Euler/CORALIE, and TRAPPIST-South
Bouchy, F.; Queloz, D.; Hellier, Coel +16 more
We report the discovery of eight hot-Jupiter exoplanets from the WASP-South transit survey. WASP-144b has a mass of 0.44 MJup, a radius of 0.85 RJup, and is in a 2.27-d orbit around a V = 12.9, K2 star which shows a 21-d rotational modulation. WASP-145Ab is a 0.89 MJup planet in a 1.77-d orbit with a grazing transi…
Deep multi-survey classification of variable stars
Becker, I.; Pichara, K.; Aguirre, C.
During the last decade, a considerable amount of effort has been made to classify variable stars using different machine-learning techniques. Typically, light curves are represented as vectors of statistical descriptors or features that are used to train various algorithms. These features demand high computational power and can last from hours to …
Gaia DR2 distances to Collinder 419 and NGC 2264 and new astrometric orbits for HD 193 322 Aa,Ab and 15 Mon Aa,Ab
Maíz Apellániz, J.
Context. On the one hand, the second data release of the Gaia mission (Gaia DR2) has opened a trove of astrometric and photometric data for Galactic clusters within a few kiloparsecs of the Sun. On the other hand, lucky imaging has been an operational technique to measure the relative positions of visual binary systems for a decade and a half. Thi…