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14 papers · 2 filters
Helium stars exploding in circumstellar material and the origin of Type Ibn supernovae
Luc Dessart, John Hillier, Hanindyo Kuncarayakti
Type Ibn supernovae (SNe) are a mysterious class of transients whose spectra exhibit persistently narrow HeI lines, and whose bolometric light curves are typically fast evolving an…
The Physical Parameters of Four WC-type Wolf-Rayet Stars in the Large Magellanic Cloud: Evidence of Evolution
Erin Aadland, Philip Massey, D. John Hillier +1
We present a spectral analysis of four LMC WC-type Wolf-Rayet (WR) stars (BAT99-8, BAT99-9, BAT99-11, and BAT99-52) to shed light on two evolutionary questions surrounding massive…
Stellar multiplicity and stellar rotation: Insights from APOGEE
Christine Mazzola Daher, Carles Badenes, Jamie Tayar +18
We measure rotational broadening in spectra taken by the Apache Point Observatory Galactic Evolution Experiment (APOGEE) survey to characterise the relationship between stellar mul…
Nebular phase properties of supernova Ibc from He-star explosions
L. Dessart, D. J. Hillier, T. Sukhbold +2
Following our recent work on Type II supernovae (SNe), we present a set of 1D nonlocal thermodynamic equilibrium radiative transfer calculations for nebular-phase Type Ibc SNe star…
Stable nickel production in Type Ia supernovae: A smoking gun for the progenitor mass?
Stéphane Blondin, Eduardo Bravo, Frank Timmes +2
At present, there are strong indications that white dwarf (WD) stars with masses well below the Chandrasekhar limit (MCh ~ 1.4 Msun) contribute a significant fraction of SN Ia prog…
A 99-minute Double-lined White Dwarf Binary from SDSS-V
Vedant Chandra, Hsiang-Chih Hwang, Nadia L. Zakamska +12
We report the discovery of SDSS J133725.26+395237.7 (hereafter SDSS J1337+3952), a double-lined white dwarf (WD+WD) binary identified in early data from the fifth generation Sloan…