The Y dwarf population with HST: unlocking the secrets of our coolest neighbours - I. Overview and first astrometric results
Date Issued
2021
Author(s)
Abstract
In this paper, we present our project that aims at determining accurate distances and proper motions for the Y brown dwarf population using the Hubble Space Telescope. We validate the program with our first results, using a single new epoch of observations of the Y0pec dwarf WISE J163940.83-684738.6. These new data allowed us to refine its proper motion and improve the accuracy of its parallax by a factor of three compared to previous determinations, now constrained to ϖ = 211.11 ± 0.56 mas. This newly derived absolute parallax corresponds to a distance of 4.737 ± 0.013 pc, an exquisite and unprecedented precision for faint ultracool Y dwarfs.
Volume
501
Issue
1
Start page
911
Issn Identifier
0035-8711
Ads BibCode
2021MNRAS.501..911F
Rights
open.access
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