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Multiple Star Systems in the Orion Nebula
GRAVITY collaboration, Martina Karl, Oliver Pfuhl +133
This work presents an interferometric study of the massive-binary fraction in the Orion Trapezium Cluster with the recently comissioned GRAVITY instrument. We observe a total of 16…
GRAVITY chromatic imaging of Eta Car's core
GRAVITY Collaboration, J. Sanchez-Bermudez, G. Weigelt +132
Eta Car is one of the most intriguing luminous blue variables in the Galaxy. Observations and models at different wavelengths suggest a central binary with a 5.54 yr period residin…
MYSTIC: Michigan Young STar Imager at CHARA
John D. Monnier, Jean-Baptiste Le Bouquin, Narsireddy Anugu +6
We present the design for MYSTIC, the Michigan Young STar Imager at CHARA. MYSTIC will be a K-band, cryogenic, 6-beam combiner for the Georgia State University CHARA telescope arra…
Astronomical interferometry with near-IR e-APD at CHARA: characterization, optimization and on-sky operation
Cyprien Lanthermann, Jean-Baptiste Le Bouquin, Narsireddy Anugu +2
We characterize a near-infrared C-RED ONE camera from First Light Imaging (FLI). This camera uses a SAPHIRA electron avalanche photo-diode array (e-APD) from Leonardo (previously S…
Detection of the gravitational redshift in the orbit of the star S2 near the Galactic centre massive black hole
GRAVITY Collaboration, R. Abuter, A. Amorim +95
The highly elliptical, 16-year-period orbit of the star S2 around the massive black hole candidate Sgr A* is a sensitive probe of the gravitational field in the Galactic centre. Ne…
MIRC-X/CHARA: sensitivity improvements with an ultra-low noise SAPHIRA detector
Narsireddy Anugu, Jean-Baptiste Le Bouquin, John D. Monnier +9
MIRC-X is an upgrade of the six-telescope infrared beam combiner at the CHARA telescope array, the world's largest baseline interferometer in the optical/infrared, located at the M…
The MIRC-X 6-telescope imager: Key science drivers, instrument design and operation
Stefan Kraus, John D. Monnier, Narsireddy Anugu +7
MIRC-X is a new beam combination instrument at the CHARA array that enables 6-telescope interferometric imaging on object classes that until now have been out of reach for milliarc…
Methods for multiple telescope beam imaging and guiding in the near infrared
N. Anugu, A. Amorim, P. Gordo +10
Atmospheric turbulence and precise measurement of the astrometric baseline vector between any two telescopes are two major challenges in implementing phase referenced interferometr…
Peak-locking centroid bias in Shack-Hartmann wavefront sensing
Narsireddy Anugu, Paulo J. V. Garcia, Carlos M. Correia
Shack-Hartmann wavefront sensing relies on accurate spot centre measurement. Several algorithms were developed with this aim, mostly focused on precision, i.e. minimizing random er…