8 papers
Radiative Data for As III, Se III, Hf IV, and Tl IV: HFR and MCDHF Calculations for Hot Subdwarf Spectroscopy
Jérôme Deprince, Lucas Maison, Solène Beauraind +3
Accurate oscillator strengths for doubly and triply ionised heavy elements are required for quantitative spectroscopy of hot subdwarfs, but available data remain sparse. We present…
V407 Vul: a triple star system with an AM CVn detectable by gravitational wave observatories
James Munday, Antonio C. Rodriguez, Nicole Reindl +23
The AM CVn class includes mass transferring, ultra-compact double white dwarf binaries with orbital periods on the timescale of minutes. A long-standing puzzle is that none of the…
Discovery of the first outbursting hot subdwarf binary: ZTF J0007+4804
E. Stringer, T. Kupfer, K. Deshmukh +10
Hot subdwarf binaries with white dwarf companions with orbital periods of less than two hours are progenitor candidates for massive single white dwarfs as well as a variety of ther…
Spectroscopic follow-up of hot subdwarf variables found in ZTF -- Atmospheric and fundamental properties of radial-mode sdB pulsators
Corey W. Bradshaw, Thomas Kupfer, Alekzander R. Kosakowski +2
Hot subdwarf variables (sdBVs) that display large-amplitude (1%), short-period variability, as a result of radial-mode pulsations, have recently become objects of interest as th…
New Level Resolved Ground and Excited State Pb III, IV, V & VI Photoionization Cross Sections for Heavy Metal Subdwarf Modeling
David J. Dougan, Matti Dorsch, Laura J. A. Scott +3
High abundances of various lead (Pb) species have been identified in the spectra of many Asymptotic Giant Branch (AGB) stars and O- and B-type subdwarfs (sdO/B). Additional atomic…
A New LISA-Detectable Type Ia Supernova Progenitor in the Southern Sky: SMSS J1138-5139
Alekzander Kosakowski, Matti Dorsch, Warren R. Brown +3
We present the discovery and analysis of a nearby eclipsing ultra-compact accreting binary at coordinates 11:38:10.91 51:39:49.15 (SMSS J11385139), the first well-constrained…
OGLE-BLAP-009 -- A Case Study for the Properties and Evolution of Blue Large-Amplitude Pulsators
Corey W. Bradshaw, Matti Dorsch, Thomas Kupfer +5
Blue large-amplitude pulsators (BLAPs) make up a rare class of hot pulsating stars with effective temperatures of 30,000 K and surface gravities of 4.0 - 5.0 dex (cgs). Th…
Modelling the AM CVn and Double Detonation Supernova Progenitor Binary System CD-3011223
Kunal Deshmukh, Evan B. Bauer, Thomas Kupfer +1
We present a detailed modelling study of CD-3011223 (CD-30), a hot subdwarf (sdB)-white dwarf (WD) binary identified as a double detonation supernova progenitor, using th…