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Direct Spectrum of the Benchmark T Dwarf HD 19467 B

Crepp, Justin R. and Rice, Emily L. and Veicht, Aaron and Aguilar, Jonathan and Pueyo, Laurent and Giorla, Paige and Nilsson, Ricky and Luscz-Cook, Statia H. and Oppenheimer, Rebecca and Hinkley, Sasha and Brenner, Douglas and Vasisht, Gautam and Cady, Eric and Beichman, Charles A. and Hillenbrand, Lynne A. and Lockhart, Thomas and Matthews, Christopher T. and Roberts, Lewis C., Jr. and Sivaramakrishnan, Anand and Soummer, Rémi and Zhai, Chengxing (2015) Direct Spectrum of the Benchmark T Dwarf HD 19467 B. Astrophysical Journal Letters, 798 (2). Art. No. L43. ISSN 2041-8205.

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HD 19467 B is presently the only directly imaged T dwarf companion known to induce a measurable Doppler acceleration around a solar-type star. We present spectroscopy measurements of this important benchmark object taken with the Project 1640 integral field unit at Palomar Observatory. Our high-contrast R ≈ 30 observations obtained simultaneously across the JH bands confirm the cold nature of the companion as reported from the discovery article and determine its spectral type for the first time. Fitting the measured spectral energy distribution to SpeX/IRTF T dwarf standards and synthetic spectra from BT-Settl atmospheric models, we find that HD 19467 B is a T5.5 ± 1 dwarf with effective temperature T_eff=978^(+20)_(-43) K. Our observations reveal significant methane absorption affirming its substellar nature. HD 19467 B shows promise to become the first T dwarf that simultaneously reveals its mass, age, and metallicity independent from the spectrum of light that it emits.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Crepp, Justin R.0000-0003-0800-0593
Rice, Emily L.0000-0002-3252-5886
Aguilar, Jonathan0000-0003-3184-0873
Pueyo, Laurent0000-0003-3818-408X
Nilsson, Ricky0000-0002-5408-4954
Oppenheimer, Rebecca0000-0001-7130-7681
Hinkley, Sasha0000-0001-8074-2562
Vasisht, Gautam0000-0002-1871-6264
Cady, Eric0000-0002-8789-2931
Beichman, Charles A.0000-0002-5627-5471
Roberts, Lewis C., Jr.0000-0003-3892-2900
Soummer, Rémi0000-0003-2753-2819
Additional Information:© 2015 The American Astronomical Society. Received 10 September 2014; accepted for publication 18 December 2014; Published 6 January 2015. The TrenDS high-contrast imaging program is supported by NASA Origins of Solar Systems grant NNX13AB03G and the NASA Early Career Fellowship program. A portion of this work was supported by the National Science Foundation under Grant Numbers AST-0215793, 0334916, 0520822, 0804417 and 1245018. This work was partially supported by NASA ADAP grant 11-ADAP11-0169 and NSF award AST 1211568. A portion of the research in this Letter was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration. J.A. is supported by the National Physical Science Consortium. This research has benefitted from the SpeX Prism Spectral Libraries, maintained by Adam Burgasser.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Subject Keywords:brown dwarfs; stars: individual (HD 19467); techniques: high angular resolution; techniques: spectroscopic
Issue or Number:2
Record Number:CaltechAUTHORS:20150205-140732611
Persistent URL:
Official Citation:Direct Spectrum of the Benchmark T Dwarf HD 19467 B Justin R. Crepp et al. 2015 ApJ 798 L43
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:54439
Deposited By: Jason Perez
Deposited On:06 Feb 2015 00:40
Last Modified:20 Feb 2020 18:56

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