ZTF J0007+4804 is the first known hot subdwarf-white dwarf binary that exhibits SU UMa-type dwarf nova outbursts with a 108.72-minute orbital period.
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Resonance lines of C IV and N V form out to 316 solar radii in the wind of an O-type star, favoring a beta-law velocity exponent of 0.5 over the usual 0.8.
Speckle imaging of 81 RR Lyrae stars detects 10 likely bound companions at 20-220 AU separations, yielding a binary fraction estimate above 12 percent.
Kohoutek 1-9's central star is a dwarf barium star with the nebula showing a thin-ring morphology consistent with binary ejection in the orbital plane.
A new compact hierarchical triple main-sequence star system G1010 was discovered through combined low- and high-SNR spectroscopy, Gaia DR3 data, and TESS light curve analysis, showing an inner eclipsing binary rather than a compact object companion.
TESS data yield a fast white-dwarf spin-down rate in V1405 Cas indicating a propeller regime, a previously unknown 1.36-day orbital period in V1716 Sco, and confirmed periods in V1674 Her, highlighting unexpected properties of accreting white dwarfs.
Observations show a slight rise in stripped-envelope supernovae relative to hydrogen-rich ones at higher metallicities, with binary-interaction or rotation models able to match the trends though no unique scenario fits best.
New adaptive optics data from nine LIRGs yields undetectable CCSN fractions of 88% for optical and 61% for near-IR surveys when combined with prior results.
The paper identifies five major open questions in nucleosynthesis and notes new tools such as large-scale chemical cartography, astrometric and asteroseismic data, gravitational wave detections, 3-D simulations, and improved lab measurements that will aid progress.
citing papers explorer
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Discovery of the first outbursting hot subdwarf binary: ZTF J0007+4804
ZTF J0007+4804 is the first known hot subdwarf-white dwarf binary that exhibits SU UMa-type dwarf nova outbursts with a 108.72-minute orbital period.
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First measurement of wind line formation regions in an early O-type star
Resonance lines of C IV and N V form out to 316 solar radii in the wind of an O-type star, favoring a beta-law velocity exponent of 0.5 over the usual 0.8.
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Finding the elusive RR Lyrae companions via speckle imaging
Speckle imaging of 81 RR Lyrae stars detects 10 likely bound companions at 20-220 AU separations, yielding a binary fraction estimate above 12 percent.
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Spectroscopic Survey of Faint Planetary-Nebula Nuclei. VIII. The Dwarf Barium Central Star of Kohoutek 1-9
Kohoutek 1-9's central star is a dwarf barium star with the nebula showing a thin-ring morphology consistent with binary ejection in the orbital plane.
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Discovery of a compact hierarchical triple main-sequence star system while searching for binary stars with compact objects
A new compact hierarchical triple main-sequence star system G1010 was discovered through combined low- and high-SNR spectroscopy, Gaia DR3 data, and TESS light curve analysis, showing an inner eclipsing binary rather than a compact object companion.
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A TESS View of Post-Eruption Variability in the Novae V1405 Cas,V1716 Sco, and V1674 Her
TESS data yield a fast white-dwarf spin-down rate in V1405 Cas indicating a propeller regime, a previously unknown 1.36-day orbital period in V1716 Sco, and confirmed periods in V1674 Her, highlighting unexpected properties of accreting white dwarfs.
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Relative frequencies of core-collapse supernovae as a function of metallicity: observations vs theoretical predictions
Observations show a slight rise in stripped-envelope supernovae relative to hydrogen-rich ones at higher metallicities, with binary-interaction or rotation models able to match the trends though no unique scenario fits best.
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The undetectable fraction of core-collapse supernovae in luminous infrared galaxies -- II. GSAOI/GeMS dataset
New adaptive optics data from nine LIRGs yields undetectable CCSN fractions of 88% for optical and 61% for near-IR surveys when combined with prior results.
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The Origin of Elements Across Cosmic Time: Astro2020 Science White Paper
The paper identifies five major open questions in nucleosynthesis and notes new tools such as large-scale chemical cartography, astrometric and asteroseismic data, gravitational wave detections, 3-D simulations, and improved lab measurements that will aid progress.