98 citations · 202 across the 11 of their papers we have counts for
12 papers
High-Angular-Resolution Survey of Stars within 18 pc of the Sun: Part I
F. Carolina Rojas-Galindo, Valeri G. Orlov, Rene A. Mendez +1
We present the rationale, design, methodology, and observational facilities of a high-angular-resolution imaging survey of stars within 18~pc of the Sun. Our comprehensive sample c…
Speckle Interferometry at SOAR in 2024 and 2025
Andrei Tokovinin, Brian D. Mason, Rene A. Mendez +1
Results of speckle interferometry observations at the 4.1 m SOuthern Astrophysical Research (SOAR) telescope obtained during 2024-2025 are presented. We present 5316 measurements o…
Spitzer + HST parallaxes of 13 late T and Y dwarfs
Federico Marocco, J. Davy Kirkpatrick, Richard L. Smart +13
We present astrometric measurements for 13 cold brown dwarfs in the solar neighborhood (d < 20pc). By combining archival Spitzer data with our own Hubble Space Telescope (HST) obse…
A review on fundamental bounds and estimators for photometry and astrometry of celestial point sources using array detectors, from first principles
Sebastián Espinosa, Rene A. Mendez, Jorge F. Silva +1
Precise astrometric and photometric measurements of celestial point sources are fundamental to modern astronomy. These measurements, used to determine object positions, motions, an…
The Diversity of Cold Worlds: Age and Characterization of the Exoplanet COCONUTS-2b
Rocio Kiman, Charles A. Beichman, Azul Ruiz Diaz +19
Studying cold brown dwarfs is key to understanding the diverse characteristics of cold giant exoplanets atmospheres. COCONUTS-2, is a wide binary system composed of a T9 brown dwar…
The impact of the point spread function fitting radius on photometric uncertainty based on the Fisher information matrix
Sebastian Espinosa, Mario L. Vicuña, Rene A. Mendez +2
In point spread function (PSF) photometry, the selection of the fitting aperture radius plays a critical role in determining the precision of flux and background estimations. Tradi…
Southern binaries with the Zorro Speckle Camera @ Gemini-South
Rene A. Mendez, Andrei Tokovinin, Edgardor Costa +1
We present measurements in the context of a survey of southern hemisphere binary and multiple stellar systems observed with the Zorro Speckle dual diffraction-limited optical imagi…
Speckle Interferometry at SOAR in 2023
Andrei Tokovinin, Brian D. Mason, Rene A. Mendez +1
Results of the speckle-interferometry observations at the 4.1 m Southern Astrophysical Research Telescope (SOAR) obtained during 2023 are presented: 1913 measurements of 1533 resol…
Optimal photometry of point sources: Joint source flux and background determination on array detectors -- from theory to practical implementation
Mario L. Vicuña, Jorge F. Silva, Rene A. Mendez +3
In this paper we study the joint determination of source and background flux for point sources as observed by digital array detectors. We explicitly compute the two-dimensional Cra…
Mass ratio of single-line spectroscopic binaries with visual orbits using Bayesian inference and suitable priors
Jennifer Anguita-Aguero, Rene A. Mendez, Miguel Videla +4
We present orbital elements for twenty-two single-line binaries, nine of them studied for the first time, determined from a joint spectroscopic and astrometric solution. The astrom…
The Solar Neighborhood. XXI. Parallax Results from the CTIOPI 0.9m Program: 20 New Members of the 25 Parsec White Dwarf Sample
John P. Subasavage, Wei-Chun Jao, Todd J. Henry +5
We present accurate trigonometric parallaxes for 20 new members of the 25 pc white dwarf sample as part of the DENSE project (Discovery and Evalution of Nearby Stellar Embers, http…
Basic parameters of three star clusters in the Small Magellanic Cloud: Kron 11, Kron 63 and NGC 121
G. Baume, N. E. D. Noël, E. Costa +3
We present observations for three star clusters, Kron 11, Kron 63 and NGC 121, in the Small Magellanic Cloud. We have studied their structure and derived their fundamental paramete…