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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Eight low-redshift Little Red Dots identified in DESI DR1 exhibit broad Balmer lines, steep decrements, compact shapes, and negligible variability, with a number density roughly 10,000 times lower than at z>4.
Sgr A* exhibits a white-noise-like flat variability regime in its 340 GHz flux on timescales below 2.3 to 6.3 minutes, transitioning to red-noise-like behavior at longer timescales, with no evidence for narrow periodic signals.
Simulations demonstrate that timescale-based decoupling predictions overestimate separations by a factor of ~3, velocity-based criteria are more accurate, and low-viscosity disks produce decreasing accretion that may identify LISA hosts.
Upper limits on the shortest AGN variability timescales are log(t_min,ul/hrs) = 0.85 ± 0.55, interpreted as light-crossing times from a few to thousands of gravitational radii in regions smaller than accretion disks.
Joint radial-velocity and astrometry analysis detects five new cold giant planets and improves precision on two known ones around CHEPS targets.
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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A new sample of Little Red Dots at $z<0.45$ in DESI DR1: Broad Balmer lines, low ionization spectrum and no variability
Eight low-redshift Little Red Dots identified in DESI DR1 exhibit broad Balmer lines, steep decrements, compact shapes, and negligible variability, with a number density roughly 10,000 times lower than at z>4.
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Short timescale variation in the submillimeter flux of Sagittarius A*
Sgr A* exhibits a white-noise-like flat variability regime in its 340 GHz flux on timescales below 2.3 to 6.3 minutes, transitioning to red-noise-like behavior at longer timescales, with no evidence for narrow periodic signals.
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The Decoupling of Binaries from Their Circumbinary Disks
Simulations demonstrate that timescale-based decoupling predictions overestimate separations by a factor of ~3, velocity-based criteria are more accurate, and low-viscosity disks produce decreasing accretion that may identify LISA hosts.
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The shortest detected intra-day variability of active galactic nuclei in TESS survey
Upper limits on the shortest AGN variability timescales are log(t_min,ul/hrs) = 0.85 ± 0.55, interpreted as light-crossing times from a few to thousands of gravitational radii in regions smaller than accretion disks.
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Cold giant discoveries from a joint radial-velocity and astrometry framework
Joint radial-velocity and astrometry analysis detects five new cold giant planets and improves precision on two known ones around CHEPS targets.