We report new observations of the central star of the planetary nebula VV 47 carried out to verify earlier assertions that the short-period pulsation modes...
On-sky demonstration of matched filters for wavefront measurements using ELT-scale elongated laser guide stars
The performance of adaptive optics systems is partially dependent on the algorithms used within the real-time control system to compute wavefront slope...
Once in a blue moon: detection of `bluing' during debris transits in the white dwarf WD 1145+017
The first transiting planetesimal orbiting a white dwarf was recently detected in K2 data of WD 1145+017 and has been followed up intensively. The multiple...
Ondřejov Echelle Spectrograph, Ground Based Support Facility for Exoplanet Missions
Fulfilling the goals of space-based exoplanetary transit surveys, like Kepler and TESS, is impossible without ground-based spectroscopic follow-up. In...
One Planet or Two Planets? The Ultra-sensitive Extreme-magnification Microlensing Event KMT-2019-BLG-1953
We present the analysis of a very high-magnification (A ∼ 900) microlensing event KMT-2019-BLG-1953. A single-lens single-source (1L1S) model appears to...
One simulation to have them all: performance of the Bias Assignment Method against N-body simulations
In this paper, we demonstrate that the information encoded in one single (sufficiently large) N-body simulation can be used to reproduce arbitrary numbers of...
One-dimensional image reconstruction by exponential filtering in infrared stellar speckle interferometry - Application to IRC + 10216
Exponential filtering, together with an improved version of the iterative Fourier-transform algorithm, is applied to image reconstruction from one-dimensional...
Ongoing star formation at the outskirts of Sextans A: spectroscopic detection of early O-type stars
With both nebular- and stellar-derived abundances of ≲1/10 Z_{⊙ } and low foreground extinction, Sextans A is a prime candidate to replace the Small Magellanic...