Search Publications
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…
The local high-velocity tail and the Galactic escape speed
Grand, Robert J. J.; Fattahi, Azadeh; Marinacci, Federico +4 more
We model the fastest moving (v_tot > 300 km s^{-1}) local (D ≲ 3 kpc) halo stars using cosmological simulations and six-dimensional Gaia data. Our approach is to use our knowledge of the assembly history and phase-space distribution of halo stars to constrain the form of the high-velocity tail of the stellar halo. Using simple analytical models…
The First Tidal Disruption Flare in ZTF: From Photometric Selection to Multi-wavelength Characterization
Cenko, S. Bradley; Riddle, Reed; Rusholme, Ben +37 more
We present Zwicky Transient Facility (ZTF) observations of the tidal disruption flare AT2018zr/PS18kh reported by Holoien et al. and detected during ZTF commissioning. The ZTF light curve of the tidal disruption event (TDE) samples the rise-to-peak exceptionally well, with 50 days of g- and r-band detections before the time of maximum light. We al…
A Spectroscopic Analysis of the California-Kepler Survey Sample. I. Stellar Parameters, Planetary Radii, and a Slope in the Radius Gap
Cunha, Katia; Smith, Verne V.; Martinez, Cintia F. +1 more
We present results from a quantitative spectroscopic analysis conducted on archival Keck/HIRES high-resolution spectra from the California-Kepler Survey (CKS) sample of transiting planetary host stars identified from the Kepler mission. The spectroscopic analysis was based on a carefully selected set of Fe I and Fe II lines, resulting in precise v…
The Degree of Alignment between Circumbinary Disks and Their Binary Hosts
Torres, Guillermo; Wilner, David J.; Macintosh, Bruce +5 more
All four circumbinary (CB) protoplanetary disks orbiting short-period (P < 20 days) double-lined spectroscopic binaries (SB2s)—a group that includes UZ Tau E, for which we present new Atacama Large Millimeter/Submillimeter Array data—exhibit sky-plane inclinations i disk that match, to within a few degrees, the sky-plane inclinations…
Driving massive molecular gas flows in central cluster galaxies with AGN feedback
Fabian, A. C.; Combes, F.; Salomé, P. +7 more
We present an analysis of new and archival ALMA observations of molecular gas in 12 central cluster galaxies. We examine emerging trends in molecular filament morphology and gas velocities to understand their origins. Molecular gas masses in these systems span 10^9 - 10^{11} M_{⊙}, far more than most gas-rich galaxies. ALMA images reveal a distrib…