Journal article
Trigonometric Parallaxes of Two T Dwarfs With Keck and ShaneAO Astrometry
Publications of the Astronomical Society of the Pacific, v 133(1026), p84401
01 Aug 2021
Abstract
We present trigonometric parallax and proper motion measurements for two T-type brown dwarfs. We derive our measurements from infrared laser guide star adaptive optics observations spanning five years from the ShaneAO/SHARCS and NIRC2/medium-cam instruments on the Shane and Keck telescopes, respectively. To improve our astrometric precision, we measure and apply a distortion correction to our fields for both instruments. We also transform the Keck and ShaneAO astrometric reference frames onto the ICRS using five-parameter parallax and proper motion solutions for background reference stars from Gaia DR2. Fitting for parallax and proper motion, we measure parallaxes of 73.5 +/- 9.2 mas and 70.1 +/- 6.7 mas for WISEJ19010703+47181688 (WISE1901) and WISEJ21543294+59421370 (WISE2154), respectively. We utilize Monte Carlo methods to estimate the error in our sparse field methods, taking into account overfitting and differential atmospheric refraction. Comparing to previous measurements in the literature, all of our parallax and proper motion values fall within 2 sigma of the published measurements, and 4 of 6 measurements are within 1 sigma. These data are among the first parallax measurements of these T dwarfs and serve as precise measurements for calibrating stellar formation models. These two objects are the first results of an ongoing survey of T dwarfs with Keck/NIRC2 and the Shane Adaptive Optics system at Lick Observatory.
Metrics
9 Record Views
Details
- Title
- Trigonometric Parallaxes of Two T Dwarfs With Keck and ShaneAO Astrometry
- Creators
- Jayke Nguyen - Lawrence Livermore National LaboratoryS. Mark Ammons - Lawrence Livermore National LaboratoryKaitlin Dennison - Stanford UniversityE. Victor Garcia - Nashotah House Theological SeminaryJessica R. Lu - University of California, BerkeleyStephen McMillan - University of MinnesotaMaissa Salama - University of Hawaiʻi at MānoaLawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Publication Details
- Publications of the Astronomical Society of the Pacific, v 133(1026), p84401
- Publisher
- IOP Publishing Ltd
- Number of pages
- 16
- Grant note
- DE-AC52-07NA27344; LLNL-JRNL-821003 / U.S. Department of Energy by Lawrence Livermore National Laboratory; United States Department of Energy (DOE) W. M. Keck Foundation; W.M. Keck Foundation
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Physics
- Web of Science ID
- WOS:000684706600001
- Scopus ID
- 2-s2.0-85114264313
- Other Identifier
- 991021879625404721
InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Astronomy & Astrophysics