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Integral field spectroscopy of the low-mass companion HD 984 B with the Gemini Planet Imager.

Johnson-Groh, Mara and Marois, Christian and De Rosa, Robert J. and Nielsen, Eric L. and Rameau, Julien and Blunt, Sarah and Vargas, Jeffrey and Ammons, S. Mark and Bailey, Vanessa P. and Barman, Travis S. and Bulger, Joanna and Chilcote, Jeffrey K. and Cotten, Tara and Doyon, René and Duchêne, Gaspard and Fitzgerald, Michael P. and Follette, Kate B. and Goodsell, Stephen and Graham, James R. and Greenbaum, Alexandra Z. and Hibon, Pascale and Hung, Li-Wei and Ingraham, Patrick and Kalas, Paul and Konopacky, Quinn M. and Larkin, James E. and Macintosh, Bruce and Maire, Jérôme and Marchis, Franck and Marley, Mark S. and Metchev, Stanimir and Millar-Blanchaer, Maxwell A. and Oppenheimer, Rebecca and Palmer, David W. and Patience, Jenny and Perrin, Marshall and Poyneer, Lisa A. and Pueyo, Laurent and Rajan, Abhijith and Rantakyrö, Fredrik T. and Savransky, Dmitry and Schneider, Adam C. and Sivaramakrishnan, Anand and Song, Inseok and Soummer, Remi and Thomas, Sandrine and Vega, David and Wallace, J. Kent and Wang, Jason J. and Ward-Duong, Kimberly and Wiktorowicz, Sloane J. and Wolff, Schuyler G. (2017) 'Integral field spectroscopy of the low-mass companion HD 984 B with the Gemini Planet Imager.', Astronomical journal., 153 (4). p. 190.

Abstract

We present new observations of the low-mass companion to HD 984 taken with the Gemini Planet Imager as a part of the Gemini Planet Imager Exoplanet Survey campaign. Images of HD 984 B were obtained in the J (1.12--1.3 micron) and H (1.50--1.80 micron) bands. Combined with archival epochs from 2012 and 2014, we fit the first orbit to the companion to find an 18 AU (70 year) orbit with a 68% confidence interval between 14 and 28 AU, an eccentricity of 0.18 with a 68% confidence interval between 0.05 and 0.47, and an inclination of 119 degrees with a 68% confidence interval between 114 degrees and 125 degrees. To address considerable spectral covariance in both spectra, we present a method of splitting the spectra into low and high frequencies to analyze the spectral structure at different spatial frequencies with the proper spectral noise correlation. Using the split spectra, we compare to known spectral types using field brown dwarf and low-mass star spectra and find a best fit match of a field gravity M6.5+/-1.5 spectral type with a corresponding temperature of 2730+120 K. Photometry of the companion yields a luminosity of log(L_bol/L_sun) = -2.88+/-0.07 dex, using DUSTY models. Mass estimates, again from DUSTY models, find an age-dependent mass of 34+/-1 to 95+/-4 M_Jup. These results are consistent with previous measurements of the object.

Item Type:Article
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Status:Peer-reviewed
Publisher Web site:https://doi.org/10.3847/1538-3881/aa6480
Publisher statement:© 2017. The American Astronomical Society. All rights reserved.
Date accepted:01 March 2017
Date deposited:11 July 2017
Date of first online publication:31 March 2017
Date first made open access:11 July 2017

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