Parallaxes and infrared photometry of three Y0 dwarfs
Abstract
We have followed up the three Y0 dwarfs WISEPA J041022.71+150248.5, WISEPA J173835.53+273258.9 and WISEPC J205628.90+145953.3 using the United Kingdom Infrared Telescope Wide Field Camera. We find parallaxes that are more consistent and accurate than previously published values. We estimate absolute magnitudes in photometric passbands from Y to W3 and find them to be consistent between the three Y0 dwarfs indicating that the inherent cosmic absolute magnitude spread of these objects is small. We examine the Mauna Kea Observatory system J magnitudes over the 4 yr time line and find small but significant monotonic variations. Finally, we estimate physical parameters from a comparison of spectra and parallax to equilibrium and non-equilibrium models finding values consistent with solar metallicity, an effective temperature of 450–475 K and log g of 4.0–4.5.
Additional Information
© 2017 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2017 March 22. Received 2017 March 13; in original form 2016 September 6. Published: 24 March 2017. We thank the anonymous referee for comments that improved the clarity of this contribution; Isabelle Baraffe and Gilles Chabrier for useful discussions on the model aspects addressed here; Luca Rizzi, Tom Kerr, Watson Varricatt and Andy Adamson for scheduling help; and Mike Cushing who promptly provided the spectra of these three targets. This work has made use of the Cambridge Astronomy Survey Unit software and the WFCAM Science Archive thanks to Mike Irwin and Mike Read for their support. The United Kingdom Infrared Telescope was operated by the Joint Astronomy Centre on behalf of the Science and Technology Facilities Council of the UK, and it is currently operated by the University of Arizona. RLS's research was supported by the 2015 Henri Chrétien International Research Grant administered by the American Astronomical Society and a Visiting Professorship with the Leverhulme Trust (VP1-2015-063). SKL's research is supported by the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., on behalf of the international Gemini partnership of Argentina, Australia, Brazil, Canada, Chile and the United States of America. FM/HRAJ/DJP acknowledges the support from UK's Science and Technology Facilities Council grant number ST/M001008/1. The collaboration was supported by the Marie Curie 7th European Community Framework Programme grant no. 247593 Interpretation and Parametrisation of Extremely Red COOL dwarfs (IPERCOOL) International Research Staff Exchange Scheme.Attached Files
Published - stx723.pdf
Submitted - 1703.10341.pdf
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Additional details
- Eprint ID
- 78526
- Resolver ID
- CaltechAUTHORS:20170623-144012832
- American Astronomical Society
- VP1-2015-063
- Leverhulme Trust
- Gemini Observatory
- ST/M001008/1
- Science and Technology Facilities Council (STFC)
- 247593
- Marie Curie Fellowship
- Created
-
2017-06-24Created from EPrint's datestamp field
- Updated
-
2021-11-15Created from EPrint's last_modified field
- Caltech groups
- Infrared Processing and Analysis Center (IPAC)