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http://hdl.handle.net/20.500.12386/33013
Titolo: | Extending Gaia DR2 with HST narrow-field astrometry - II. Refining the method on WISE J163940.83-684738.6 | Autori: | BEDIN, Luigi Fontanive, C. |
Data pubblicazione: | 2020 | Rivista: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Numero: | 494 | Fascicolo: | 2 | Da pagina:: | 2068 | Abstract: | In the second paper of this series, we perfected our method of linking high-precision Hubble Space Telescope astrometry to the high-accuracy Gaia DR2 absolute reference system to overcome the limitations of relative astrometry with narrow-field cameras. Our test case here is the Y brown dwarf WISE J163940.83-684738.6, observed at different epochs spread over a 6-yr time baseline with the Infra-Red channel of the Wide Field Camera 3. We derived significantly improved astrometric parameters compared to previous determinations, finding (μ<SUB>αcos </SUB><SUB>δ</SUB>, μ<SUB>δ</SUB>, ϖ) = (577.21 ± 0.24 mas yr<SUP>-1</SUP>, -3108.39 ± 0.27 mas yr<SUP>-1</SUP>, 210.4 ± 1.8 mas). In particular, our derived absolute parallax (ϖ ) corresponds to a distance of 4.75 ± 0.05 pc for the faint ultracool dwarf. | URI: | http://hdl.handle.net/20.500.12386/33013 | URL: | https://academic.oup.com/mnras/article/494/2/2068/5775319 http://arxiv.org/abs/2002.09331v1 |
ISSN: | 0035-8711 | DOI: | 10.1093/mnras/staa540 | Bibcode ADS: | 2020MNRAS.494.2068B | Fulltext: | open |
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