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Intracluster light: a luminous tracer for dark matter in clusters of galaxies
Trujillo, Ignacio; Montes, Mireia
The bulk of stars in galaxy clusters are confined within their constituent galaxies. Those stars do not trace the extended distribution of dark matter well as they are located in the central regions of the cluster's dark matter subhaloes. A small fraction of stars is expected, however, to follow the global dark matter shape of the cluster. These a…
The Broad Absorption Line Tidal Disruption Event iPTF15af: Optical and Ultraviolet Evolution
Cenko, S. B.; Veilleux, S.; Bloom, J. S. +16 more
We present multiwavelength observations of the tidal disruption event (TDE) iPTF15af, discovered by the intermediate Palomar Transient Factory survey at redshift z = 0.07897. The optical and ultraviolet (UV) light curves of the transient show a slow decay over 5 months, in agreement with previous optically discovered TDEs. It also has a comparable…
A Second Terrestrial Planet Orbiting the Nearby M Dwarf LHS 1140
Latham, David W.; Esquerdo, Gilbert A.; Tan, Thiam-Guan +27 more
LHS 1140 is a nearby mid-M dwarf known to host a temperate rocky super-Earth (LHS 1140 b) on a 24.737-day orbit. Based on photometric observations by MEarth and Spitzer as well as Doppler spectroscopy from the High Accuracy Radial velocity Planet Searcher, we report the discovery of an additional transiting rocky companion (LHS 1140 c) with a mass…
Luminous red novae: Stellar mergers or giant eruptions?
Drake, A. J.; Sollerman, J.; Djorgovski, S. G. +36 more
We present extensive datasets for a class of intermediate-luminosity optical transients known as luminous red novae. They show double-peaked light curves, with an initial rapid luminosity rise to a blue peak (at -13 to -15 mag), which is followed by a longer-duration red peak that sometimes is attenuated, resembling a plateau. The progenitors of t…
New View of the Solar Chromosphere
De Pontieu, Bart; Carlsson, Mats; Hansteen, Viggo H.
The solar chromosphere forms a crucial, yet complex and until recently poorly understood, interface between the solar photosphere and the heliosphere. Advances in high-resolution instrumentation, adaptive optics, image reconstruction techniques, and space-based observatories allow unprecedented high-resolution views of the finely structured and hi…
Transient processing and analysis using AMPEL: alert management, photometry, and evaluation of light curves
Sollerman, J.; Gal-Yam, A.; Kowalski, M. +18 more
Context. Both multi-messenger astronomy and new high-throughput wide-field surveys require flexible tools for the selection and analysis of astrophysical transients.
Aims: Here we introduce the alert management, photometry, and evaluation of light curves (AMPEL) system, an analysis framework designed for high-throughput surveys and suited for…
Magnetic field strengths of hot Jupiters from signals of star-planet interactions
Shkolnik, Evgenya L.; Cauley, P. Wilson; Llama, Joe +1 more
Evidence of star-planet interactions in the form of planet-modulated chromospheric emission has been noted for a number of hot Jupiters. Magnetic star-planet interactions involve the release of energy stored in the stellar and planetary magnetic fields. These signals thus offer indirect detections of exoplanetary magnetic fields. Here, we report t…
X-rays across the galaxy population - III. The incidence of AGN as a function of star formation rate
Georgakakis, A.; Aird, J.; Coil, A. L.
We map the co-eval growth of galaxies and their central supermassive black holes in detail by measuring the incidence of active galactic nuclei (AGNs) in galaxies as a function of star formation rate (SFR) and redshift (to z ∼ 4). We combine large galaxy samples with deep Chandra X-ray imaging to measure the probability distribution of specific bl…
Black Hole Mass Scaling Relations for Spiral Galaxies. I. M BH-M *,sph
Graham, Alister W.; Davis, Benjamin L.; Cameron, Ewan
The (supermassive black hole mass, M BH)-(bulge stellar mass, {M}* ,{sph}) relation is, obviously, derived using two quantities. We endeavor to provide accurate values for the latter via detailed multicomponent galaxy decompositions for the current full sample of 43 spiral galaxies having directly measured M BH val…
Towards emulating cosmic shear data: revisiting the calibration of the shear measurements for the Kilo-Degree Survey
Hoekstra, Henk; Heymans, Catherine; Kuijken, Konrad +9 more
Exploiting the full statistical power of future cosmic shear surveys will necessitate improvements to the accuracy with which the gravitational lensing signal is measured. We present a framework for calibrating shear with image simulations that demonstrates the importance of including realistic correlations between galaxy morphology, size, and mor…