Search Publications
Relative Astrometry in an Annular Field
Lattanzi, M. G.; Busonero, D.; Butkevich, A. G. +4 more
Background. Relative astrometry at or below the microarcsec level with a 1 m class space telescope has been repeatedly proposed as a tool for exo-planet detection and characterization, as well as for several topics at the forefront of Astrophysics and Fundamental Physics. Aim. This paper investigates the potential benefits of an instrument concept…
Global Extinction: Gemini North and South GMOS Combined Photometry Relative to the Gaia Catalog, and Long-term Atmospheric Change
Steinbring, Eric
Effects of long-term atmospheric change were looked for in photometry employing Gemini North and South twin Multi-Object Spectrograph (GMOS-N and GMOS-S) archival data. The whole GMOS imaging database, beginning from 2003, was compared against the all-sky Gaia object catalog, yielding ~106 Sloan $r^{\prime} $ -filter samples, ending in …
Optical Time-series Photometry of the Symbiotic Nova V1835 Aquilae
Layden, Andrew C.; Caddy, Robert V.; Reichart, Daniel E. +7 more
We present time-series CCD photometry in the BVRI passbands of the recently identified symbiotic nova V1835 Aquilae (NSV 11749) over an interval of 5.1 yr with 7-14 day cadence, observed during its quiescence. We find slow light variations with a range of ~0.9 mag in V and ~0.3 mag in I. Analysis of these data show strong periodicity at 419 ± 10 d…
Charge-injection Device Imaging of Sirius with Contrast Ratios Greater than 1:26 Million
Sawant, Sailee M.; Batcheldor, Daniel
The intrinsic nature of many astronomical objects, such as binary and multiple systems, exoplanets, circumstellar and debris disks, and quasar host galaxies, introduces challenging requirements for observational instrumentation and techniques. In each case, we encounter situations where the light from bright sources hampers our ability to detect s…