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Discovery of a substellar companion to the nearby debris disk host HR 2562.

Konopacky, Quinn M. and Rameau, Julien and Duchêne, Gaspard and Filippazzo, Joseph C. and Giorla Godfrey, Paige A. and Marois, Christian and Nielsen, Eric L. and Pueyo, Laurent and Rafikov, Roman R. and Rice, Emily L. and Wang, Jason J. and Ammons, S. Mark and Bailey, Vanessa P. and Barman, Travis S. and Bulger, Joanna and Bruzzone, Sebastian and Chilcote, Jeffrey K. and Cotten, Tara and Dawson, Rebekah I. and De Rosa, Robert J. and Doyon, René and Esposito, Thomas M. and Fitzgerald, Michael P. and Follette, Katherine 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 Lafrenière, David and Larkin, James E. and Macintosh, Bruce A. and Maire, Jérôme and Marchis, Franck and Marley, Mark S. and Matthews, Brenda C. and Metchev, Stanimir and Millar-Blanchaer, Maxwell A. and Oppenheimer, Rebecca and Palmer, David W. and Patience, Jenny and Perrin, Marshall D. and Poyneer, Lisa A. 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 Wallace, J. Kent and Ward-Duong, Kimberly and Wiktorowicz, Sloane J. and Wolff, Schuyler G. (2016) 'Discovery of a substellar companion to the nearby debris disk host HR 2562.', Astrophysical journal letters., 829 (1). L4.

Abstract

We present the discovery of a brown dwarf companion to the debris disk host star HR 2562. This object, discovered with the Gemini Planet Imager (GPI), has a projected separation of 20.3±0.3 au (0.618±0.004") from the star. With the high astrometric precision afforded by GPI, we have confirmed common proper motion of HR 2562B with the star with only a month time baseline between observations to more than 5σ. Spectral data in J, H, and K bands show morphological similarity to L/T transition objects. We assign a spectral type of L7±3 to HR 2562B, and derive a luminosity of log(Lbol/L⊙)=-4.62±0.12, corresponding to a mass of 30±15 MJup from evolutionary models at an estimated age of the system of 300-900 Myr. Although the uncertainty in the age of the host star is significant, the spectra and photometry exhibit several indications of youth for HR 2562B. The source has a position angle consistent with an orbit in the same plane as the debris disk recently resolved with Herschel. Additionally, it appears to be interior to the debris disk. Though the extent of the inner hole is currently too uncertain to place limits on the mass of HR 2562B, future observations of the disk with higher spatial resolution may be able to provide mass constraints. This is the first brown dwarf-mass object found to reside in the inner hole of a debris disk, offering the opportunity to search for evidence of formation above the deuterium burning limit in a circumstellar disk.

Item Type:Article
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Status:Peer-reviewed
Publisher Web site:https://doi.org/10.3847/2041-8205/829/1/L4
Publisher statement:© 2016. The American Astronomical Society. All rights reserved.
Date accepted:22 August 2016
Date deposited:26 January 2017
Date of first online publication:14 September 2016
Date first made open access:26 January 2017

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