VVV J165507.19-421755.5: A Nearby T Dwarf Hidden in the Galactic Plane

The Backyard Worlds: Planet 9 Collaboration; The Backyard Worlds: Cool Neighbors Collaboration

doi:10.3847/2515-5172/ac9141

VVV J165507.19-421755.5: A Nearby T Dwarf Hidden in the Galactic Plane

The Backyard Worlds: Planet 9 Collaboration, The Backyard Worlds: Cool Neighbors Collaboration

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Abstract

We present the discovery of VVV J165507.19−421755.5, a mid-T dwarf found through ongoing unWISE-based proper motion searches. A near-infrared spectrum of this object obtained with the NIRES instrument on the Keck II telescope indicates a spectral classification of T5. Using data from the VISTA Variables in the Via Lactea (VVV) catalog with a 9 year baseline, we measure a proper motion of ( μαcos(δ) , μ δ ) = (−631.0 ± 1.3, −315.0 ± 1.4) mas yr−1 and a trigonometric parallax of π abs = 66.0 ± 4.8 mas, corresponding to a distance of 15.2 ± 1.1 pc. The trigonometric parallax agrees well with our photometric distance estimate (16.1 −3.9+5.1 pc) assuming that VVV J165507.19−421755.5 is a single T5 dwarf. VVV J165507.19−421755.5 is a new member of the 20 parsec census.

Original language	English
Article number	189
Pages (from-to)	1-4
Number of pages	4
Journal	Research Notes of the American Astronomical Society
Volume	6
Issue number	9
Early online date	14 Sept 2022
DOIs	https://doi.org/10.3847/2515-5172/ac9141
Publication status	Published - 14 Sept 2022

Keywords

340
Stars and Stellar Physics

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10.3847/2515-5172/ac9141Licence: CC BY

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© 2022. The Author(s). Published by the American Astronomical Society. This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY), https://creativecommons.org/licenses/by/4.0/
Final published version, 678 KBLicence: CC BY

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title = "VVV J165507.19-421755.5: A Nearby T Dwarf Hidden in the Galactic Plane",

abstract = "We present the discovery of VVV J165507.19−421755.5, a mid-T dwarf found through ongoing unWISE-based proper motion searches. A near-infrared spectrum of this object obtained with the NIRES instrument on the Keck II telescope indicates a spectral classification of T5. Using data from the VISTA Variables in the Via Lactea (VVV) catalog with a 9 year baseline, we measure a proper motion of ( μαcos(δ) , μ δ ) = (−631.0 ± 1.3, −315.0 ± 1.4) mas yr−1 and a trigonometric parallax of π abs = 66.0 ± 4.8 mas, corresponding to a distance of 15.2 ± 1.1 pc. The trigonometric parallax agrees well with our photometric distance estimate (16.1 −3.9+5.1 pc) assuming that VVV J165507.19−421755.5 is a single T5 dwarf. VVV J165507.19−421755.5 is a new member of the 20 parsec census.",

keywords = "340, Stars and Stellar Physics",

author = "The Backyard Worlds: Planet 9 Collaboration and The Backyard Worlds: Cool Neighbors Collaboration and Noah Schapera and Dan Caselden and Meisner, {Aaron M.} and Burgasser, {Adam J.} and Schneider, {Adam C.} and Austin Humphreys and Chih-Chun Hsu and Emma Softich and Smith, {Leigh C.} and Lucas, {Philip W.} and Kirkpatrick, {J. Davy} and Federico Marocco and Faherty, {Jacqueline K.} and Kuchner, {Marc J.} and Cushing, {Michael C.}",

note = "{\textcopyright} 2022. The Author(s). Published by the American Astronomical Society. This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY), https://creativecommons.org/licenses/by/4.0/",

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doi = "10.3847/2515-5172/ac9141",

language = "English",

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T1 - VVV J165507.19-421755.5: A Nearby T Dwarf Hidden in the Galactic Plane

AU - The Backyard Worlds: Planet 9 Collaboration

AU - The Backyard Worlds: Cool Neighbors Collaboration

AU - Schapera, Noah

AU - Caselden, Dan

AU - Meisner, Aaron M.

AU - Burgasser, Adam J.

AU - Schneider, Adam C.

AU - Humphreys, Austin

AU - Hsu, Chih-Chun

AU - Softich, Emma

AU - Smith, Leigh C.

AU - Lucas, Philip W.

AU - Kirkpatrick, J. Davy

AU - Marocco, Federico

AU - Faherty, Jacqueline K.

AU - Kuchner, Marc J.

AU - Cushing, Michael C.

N1 - © 2022. The Author(s). Published by the American Astronomical Society. This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY), https://creativecommons.org/licenses/by/4.0/

PY - 2022/9/14

Y1 - 2022/9/14

N2 - We present the discovery of VVV J165507.19−421755.5, a mid-T dwarf found through ongoing unWISE-based proper motion searches. A near-infrared spectrum of this object obtained with the NIRES instrument on the Keck II telescope indicates a spectral classification of T5. Using data from the VISTA Variables in the Via Lactea (VVV) catalog with a 9 year baseline, we measure a proper motion of ( μαcos(δ) , μ δ ) = (−631.0 ± 1.3, −315.0 ± 1.4) mas yr−1 and a trigonometric parallax of π abs = 66.0 ± 4.8 mas, corresponding to a distance of 15.2 ± 1.1 pc. The trigonometric parallax agrees well with our photometric distance estimate (16.1 −3.9+5.1 pc) assuming that VVV J165507.19−421755.5 is a single T5 dwarf. VVV J165507.19−421755.5 is a new member of the 20 parsec census.

AB - We present the discovery of VVV J165507.19−421755.5, a mid-T dwarf found through ongoing unWISE-based proper motion searches. A near-infrared spectrum of this object obtained with the NIRES instrument on the Keck II telescope indicates a spectral classification of T5. Using data from the VISTA Variables in the Via Lactea (VVV) catalog with a 9 year baseline, we measure a proper motion of ( μαcos(δ) , μ δ ) = (−631.0 ± 1.3, −315.0 ± 1.4) mas yr−1 and a trigonometric parallax of π abs = 66.0 ± 4.8 mas, corresponding to a distance of 15.2 ± 1.1 pc. The trigonometric parallax agrees well with our photometric distance estimate (16.1 −3.9+5.1 pc) assuming that VVV J165507.19−421755.5 is a single T5 dwarf. VVV J165507.19−421755.5 is a new member of the 20 parsec census.

KW - 340

KW - Stars and Stellar Physics

U2 - 10.3847/2515-5172/ac9141

DO - 10.3847/2515-5172/ac9141

M3 - Article

SN - 2515-5172

VL - 6

SP - 1

EP - 4

JO - Research Notes of the American Astronomical Society

JF - Research Notes of the American Astronomical Society

IS - 9

M1 - 189

ER -

VVV J165507.19-421755.5: A Nearby T Dwarf Hidden in the Galactic Plane

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