Search Publications
Weak Mass Loss from the Red Supergiant Progenitor of the Type II SN 2021yja
Kilpatrick, Charles D.; Foley, Ryan J.; Pan, Yen-Chen +56 more
We present high-cadence optical, ultraviolet (UV), and near-infrared data of the nearby (D ≈ 23 Mpc) Type II supernova (SN) 2021yja. Many Type II SNe show signs of interaction with circumstellar material (CSM) during the first few days after explosion, implying that their red supergiant (RSG) progenitors experience episodic or eruptive mass loss. …
Prospects for multimessenger detection of binary neutron star mergers in the fourth LIGO-Virgo-KAGRA observing run
Patricelli, Barbara; Bernardini, Maria Grazia; Mapelli, Michela +5 more
The joint detection of GW170817 and GRB 170817A opened the era of multimessenger astronomy with gravitational waves (GWs) and provided the first direct probe that at least some binary neutron star (BNS) mergers are progenitors of short gamma-ray bursts (S-GRBs). In the next years, we expect to have more multimessenger detections of BNS mergers, th…
An Updated Metal-dependent Theoretical Scenario for Classical Cepheids
Marconi, Marcella; Molinaro, Roberto; Ripepi, Vincenzo +3 more
To properly quantify the possible residual systematic errors affecting the classical Cepheid distance scale, a detailed theoretical scenario is recommended. By extending the set of nonlinear, convective pulsation models published for Z = 0.02 to Z = 0.004, Z = 0.008, and Z = 0.03, we provide a detailed homogeneous, nonlinear model grid taking into…
High-energy neutrino transients and the future of multi-messenger astronomy
Guépin, Claire; Kotera, Kumiko; Oikonomou, Foteini
The discovery of high-energy astrophysical neutrinos and the first hints of coincident electromagnetic and neutrino emissions opened new opportunities in multi-messenger astronomy. Owing to their high power, transient sources are expected to supply a significant fraction of the observed energetic astroparticles, through enhanced particle accelerat…
Strong lensing in UNIONS: Toward a pipeline from discovery to modeling
Scott, D.; Fabbro, S.; Gavazzi, R. +16 more
We present a search for galaxy-scale strong gravitational lenses in the initial 2500 square degrees of the Canada-France Imaging Survey (CFIS). We designed a convolutional neural network (CNN) committee that we applied to a selection of 2 344 002 exquisite-seeing r-band images of color-selected luminous red galaxies. Our classification uses a real…
Black hole spin–orbit misalignment in the x-ray binary MAXI J1820+070
Jonker, Peter G.; Piirola, Vilppu; Tsygankov, Sergey S. +10 more
The observational signatures of black holes in x-ray binary systems depend on their masses, spins, accretion rate, and the misalignment angle between the black hole spin and the orbital angular momentum. We present optical polarimetric observations of the black hole x-ray binary MAXI J1820+070, from which we constrain the position angle of the bin…
J-PLUS: Stellar parameters, C, N, Mg, Ca, and [α/Fe] abundances for two million stars from DR1
Xiang, Maosheng; Huang, Yang; Liu, Jifeng +20 more
Context. The Javalambre Photometric Local Universe Survey (J-PLUS) has obtained precise photometry in 12 specially designed filters for large numbers of Galactic stars. Deriving their precise stellar atmospheric parameters and individual elemental abundances is crucial for studies of Galactic structure and the assembly history and chemical evoluti…
Constraining Black Hole Natal Kicks with Astrometric Microlensing
Andrews, Jeff J.; Kalogera, Vicky
Multiple pieces of evidence suggest that neutron stars receive large kicks when formed from the remnant of a collapsing star. However, the evidence for whether black holes (BHs) receive natal kicks is less clear, reliant on weak constraints from the analysis of BH X-ray binaries and massive runaway and walkaway stars. Here we show, for the first t…
The Origin of Weakened Magnetic Braking in Old Solar Analogs
Ayres, Thomas R.; Kochukhov, Oleg; Stassun, Keivan G. +10 more
The rotation rates of main-sequence stars slow over time as they gradually lose angular momentum to their magnetized stellar winds. The rate of angular momentum loss depends on the strength and morphology of the magnetic field, the mass-loss rate, and the stellar rotation period, mass, and radius. Previous observations suggested a shift in magneti…
A New UV Spectral Feature on Europa: Confirmation of NaCl in Leading-hemisphere Chaos Terrain
Alday, Juan; Roth, Lorenz; Brown, Michael E. +6 more
Recent visible-wavelength observations of Europa's surface obtained with the Hubble Space Telescope (HST) revealed the presence of an absorption feature near 450 nm that appears spatially correlated with leading-hemisphere chaos terrain. This feature was interpreted to reflect the presence of irradiated sodium chloride ultimately sourced from the …