New Extinction and Mass Estimates of the Low-mass Companion 1RXS 1609 B with the Magellan AO System: Evidence of an Inclined Dust Disk
Date Issued
2015
Author(s)
Wu, Ya-Lin
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Close, Laird M.
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Males, Jared R.
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Barman, Travis S.
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Morzinski, Katie M.
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Follette, Katherine B.
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Bailey, Vanessa P.
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Rodigas, Timothy J.
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Hinz, Philip
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•
•
Description
We thank the anonymous referee for helpful comments. We thank Professor David Lafrenière for providing the companion’s spectra. We thank the whole Magellan Staff for making this wonderful telescope possible. We would especially like to thank Povilas Palunas (for help over the entire MagAO commissioning run). Juan Gallardo, Patricio Jones, Emilio Cerda, Felipe Sanchez, Gabriel Martin, Maurico Navarrete, Jorge Bravo, and the whole team of technical experts helped perform many exacting tasks in a very professional manner. Glenn Eychaner, David Osip, and Frank Perez all gave expert support which was fantastic. It is a privilege to be able to commission an AO system on such a fine telescope and site. The MagAO system was developed with support from the NSF, MRI, and TSIP programs. The VisAO camera was developed with help from the NSF ATI program. Y.-L.W.'s and L.M.C.'s research were supported by NSF AAG and NASA Origins of Solar Systems grants. J.R.M. is grateful for the generous support of the Phoenix ARCS Foundation. J.R.M. and K.M. were supported under contract with the California Institute of Technology, funded by NASA through the Sagan Fellowship Program. V.B. was supported in part by the NSF Graduate Research Fellowship Program (DGE-1143953). Y.-L.W. thanks Mr. Cosmos C. Yeh for some interesting discussions about academia.
Abstract
We used the Magellan adaptive optics system to image the 11 Myr substellar companion 1RXS 1609 B at the bluest wavelengths to date (z′ and Ys). Comparison with synthetic spectra yields a higher temperature than previous studies of {T}{eff}=2000+/- 100 {{K}} and significant dust extinction of {A}V={4.5}-0.7+0.5 mag. Mass estimates based on the DUSTY tracks gives 0.012-0.015 {M}☉ , making the companion likely a low-mass brown dwarf surrounded by a dusty disk. Our study suggests that 1RXS 1609 B is one of the ̃25% of Upper Scorpius low-mass members harboring disks, and it may have formed like a star and not a planet out at ̃320 AU.
This paper includes data gathered with the 6.5 m Magellan Clay Telescope at Las Campanas Observatory, Chile.
Volume
807
Issue
1
Start page
L13
Issn Identifier
2041-8205
Ads BibCode
2015ApJ...807L..13W
Rights
open.access
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