Direct spectrum of the benchmark t dwarf HD 19467 B
Crepp, JR; Rice, EL; Veicht, A; et al.Aguilar, J; Pueyo, L; Giorla, P; Nilsson, R; Luszcz-Cook, SH; Oppenheimer, R; Hinkley, S; Brenner, D; Vasisht, G; Cady, E; Beichman, CA; Hillenbrand, LA; Lockhart, T; Matthews, CT; Roberts, LC; Sivaramakrishnan, A; Soummer, R; Zhai, C
Date: 6 January 2015
Article
Journal
Astrophysical Journal Letters
Publisher
American Astronomical Society / IOP Publishing
Publisher DOI
Abstract
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 ...
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 Teff = 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.
Physics and Astronomy
Faculty of Environment, Science and Economy
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