Integral Field Spectroscopy of the Low-mass Companion HD 984 B with the Gemini Planet Imager

Johnson-Groh, Mara; Marois, Christian; De Rosa, Robert J.; Nielsen, Eric L.; Rameau, Julien; Blunt, Sarah; Vargas, Jeffrey; Ammons, S. Mark; Bailey, Vanessa P.; Barman, Travis S.; Bulger, Joanna; Chilcote, Jeffrey K.; Cotten, Tara; Doyon, René; Duchêne, Gaspard; Fitzgerald, Michael P.; Follette, Kate B.; Goodsell, Stephen; Graham, James R.; Greenbaum, Alexandra Z.; Hibon, Pascale; Hung, Li-Wei; Ingraham, Patrick; Kalas, Paul; Konopacky, Quinn M.; Larkin, James E.; Macintosh, Bruce; Maire, Jérôme; Marchis, Franck; Marley, Mark S.; Metchev, Stanimir; Millar-Blanchaer, Maxwell A.; Oppenheimer, Rebecca; Palmer, David W.; Patience, Jenny; Perrin, Marshall; Poyneer, Lisa A.; Pueyo, Laurent; Rajan, Abhijith; Rantakyrö, Fredrik T.; Savransky, Dmitry; Schneider, Adam C.; Sivaramakrishnan, Anand; Song, Inseok; Soummer, Remi; Thomas, Sandrine; Vega, David; Wallace, J. Kent; Wang, Jason J.; Ward-Duong, Kimberly; Wiktorowicz, Sloane J.; Wolff, Schuyler G.

doi:10.3847/1538-3881/aa6480

Integral Field Spectroscopy of the Low-mass Companion HD 984 B with the Gemini Planet Imager

Johnson-Groh, Mara; Marois, Christian; De Rosa, Robert J.; Nielsen, Eric L.; Rameau, Julien; Blunt, Sarah; Vargas, Jeffrey; Ammons, S. Mark; Bailey, Vanessa P.; Barman, Travis S.; Bulger, Joanna; Chilcote, Jeffrey K.; Cotten, Tara; Doyon, René; Duchêne, Gaspard; Fitzgerald, Michael P.; Follette, Kate B.; Goodsell, Stephen; Graham, James R.; Greenbaum, Alexandra Z.; Hibon, Pascale; Hung, Li-Wei; Ingraham, Patrick; Kalas, Paul; Konopacky, Quinn M.; Larkin, James E.; Macintosh, Bruce; Maire, Jérôme; Marchis, Franck; Marley, Mark S.; Metchev, Stanimir; Millar-Blanchaer, Maxwell A.; Oppenheimer, Rebecca; Palmer, David W.; Patience, Jenny; Perrin, Marshall; Poyneer, Lisa A.; Pueyo, Laurent; Rajan, Abhijith; Rantakyrö, Fredrik T.; Savransky, Dmitry; Schneider, Adam C.; Sivaramakrishnan, Anand; Song, Inseok; Soummer, Remi; Thomas, Sandrine; Vega, David; Wallace, J. Kent; Wang, Jason J.; Ward-Duong, Kimberly; Wiktorowicz, Sloane J.; Wolff, Schuyler G.

Authors

Mara Johnson-Groh

Christian Marois

Robert J. De Rosa

Eric L. Nielsen

Julien Rameau

Sarah Blunt

Jeffrey Vargas

S. Mark Ammons

Vanessa P. Bailey

Travis S. Barman

Joanna Bulger

Jeffrey K. Chilcote

Tara Cotten

René Doyon

Gaspard Duchêne

Michael P. Fitzgerald

Kate B. Follette

Dr Stephen Goodsell stephen.goodsell@durham.ac.uk
Programme Manager

James R. Graham

Alexandra Z. Greenbaum

Pascale Hibon

Li-Wei Hung

Patrick Ingraham

Paul Kalas

Quinn M. Konopacky

James E. Larkin

Bruce Macintosh

Jérôme Maire

Franck Marchis

Mark S. Marley

Stanimir Metchev

Maxwell A. Millar-Blanchaer

Rebecca Oppenheimer

David W. Palmer

Jenny Patience

Marshall Perrin

Lisa A. Poyneer

Laurent Pueyo

Abhijith Rajan

Fredrik T. Rantakyrö

Dmitry Savransky

Adam C. Schneider

Anand Sivaramakrishnan

Inseok Song

Remi Soummer

Sandrine Thomas

David Vega

J. Kent Wallace

Jason J. Wang

Kimberly Ward-Duong

Sloane J. Wiktorowicz

Schuyler G. Wolff

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.

Citation

Johnson-Groh, M., Marois, C., De Rosa, R. J., Nielsen, E. L., Rameau, J., Blunt, S., …Wolff, S. G. (2017). Integral Field Spectroscopy of the Low-mass Companion HD 984 B with the Gemini Planet Imager. Astronomical Journal, 153(4), Article 190. https://doi.org/10.3847/1538-3881/aa6480

Journal Article Type	Article
Acceptance Date	Mar 1, 2017
Online Publication Date	Mar 31, 2017
Publication Date	Mar 31, 2017
Deposit Date	Jul 11, 2017
Publicly Available Date	Jul 11, 2017
Journal	Astronomical Journal
Print ISSN	0004-6256
Electronic ISSN	1538-3881
Publisher	IOP Publishing
Peer Reviewed	Peer Reviewed
Volume	153
Issue	4
Article Number	190
DOI	https://doi.org/10.3847/1538-3881/aa6480