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Coupling Control of a Telescope Focus into a Single-Mode Optical Fiber Based on a Reference Model Controller
(IEEE, 2017)
We propose and demonstrate a low-cost magnetomechanical fiber micro-positioner for optical coupling, with a
square-millimeter working range and a resolution of a few
microns per pixel. We demonstrate the functionality ...
Finding a Point of Observation in the Global South: The C. L. Gerling and JM Gilliss Correspondence (1847-1856)
(SAGE, 2020)
Historians of science have amply demonstrated the transnational character of science; however, they have not sufficiently attended to how several scientific projects were coordinated as part of global initiatives. Our ...
A FPGA-based fast converging digital adaptive filter for real time RFI mitigation on ground based radio telescopes
(IOP Publishing Ltd, 2018)
Radio Frequency Interference (RFI) is a growing concern in the radio astronomy community. Single-dish telescopes are particularly susceptible to RFI. Several methods have been developed to cope with RF-polluted environments, ...
Todos los instrumentos están en buen estado. Disputas en torno al funcionamiento de los telescopios del Observatorio Astronómico Nacional de Chile en el siglo XIX
(CSIC - Consejo Superior de Investigaciones Científicas, 2020)
This paper analyses a public controversy about the state of the main instruments at the National Astronomical Observatory of Chile at the end of the 19th century, the repair and the maintenance work of these tools and the ...
Correcting the extended-source calibration for the herschel-SPIRE fourier-transform spectrometer
(Oxford University Press, 2018)
We describe an update to the Herschel-Spectral and Photometric Imaging Receiver (SPIRE)
Fourier-transform spectrometer (FTS) calibration for extended sources, which incorporates
a correction for the frequency-dependent ...
Radiation damage effects in space-borne CCD detectors operated in TDI mode
(IOP Publishing, 2017-07-01)
We evaluate the astrometric and photometric implications of a series of laboratory tests conducted to study the effects of radiation damage caused by solar protons in space-borne charge coupled devices (CCDs). The photometric ...
The next generation transit survey (NGTS)
(Oxford University Press, 2018)
We describe the Next Generation Transit Survey (NGTS), which is a ground-based project searching for transiting exoplanets orbiting bright stars. NGTS builds on the legacy of previous surveys, most notably WASP, and is ...
Upper limits for mass and radius of objects around proxima cen from SPHERE/VLT
(Oxford University Press, 2017)
The recent discovery of an earth-like planet around Proxima Centauri has drawn much attention to this star and its environment. We performed a series of observations of Proxima Centauri using Spectro-Polarimetric High-contrast ...
On the possibility of breaking the heterodyne detection quantum noise limit with cross-correlation
(Institute of Electrical and Electronics Engineers Inc., 2018)
The cross-correlation sensitivity of two identical balanced photodiode heterodyne receivers
is characterized. Both the balanced photodiodes receive the same weak signal split up equally, a situation
equivalent to an ...
Speckle Interferometry at SOAR in 2016 and 2017
(Institute of Physics Publishing, 2018)
The results of speckle interferometric observations at the 4.1 m Southern Astrophysical Research Telescope in 2016 and 2017 are given, totaling 2483 measurements of 1570 resolved pairs and 609 non-resolutions. We describe ...