Detection of a Low-mass Stellar Companion to the Accelerating A2IV Star HR 1645

De Rosa, Robert J.; Nielsen, Eric L.; Rameau, Julien; Duchêne, Gaspard; Greenbaum, Alexandra Z.; Wang, Jason J.; Ammons, S. Mark; Bailey, Vanessa P.; Barman, Travis; Bulger, Joanna; Chilcote, Jeffrey; Cotten, Tara; Doyon, Rene; Esposito, Thomas M.; Fitzgerald, Michael P.; Follette, Katherine B.; Gerard, Benjamin L.; Goodsell, Stephen J.; Graham, James R.; Hibon, Pascale; Hom, Justin; Hung, Li-Wei; Ingraham, Patrick; Kalas, Paul; Konopacky, Quinn; Larkin, James E.; Macintosh, Bruce; Maire, Jérôme; Marchis, Franck; Marley, Mark S.; Marois, Christian; Metchev, Stanimir; Millar-Blanchaer, Maxwell A.; Oppenheimer, Rebecca; Palmer, David; Patience, Jennifer; Perrin, Marshall; Poyneer, Lisa; Pueyo, Laurent; Rajan, Abhijith; Rantakyrö, Fredrik T.; Ren, Bin; Ruffio, Jean-Baptiste; Savransky, Dmitry; Schneider, Adam C.; Sivaramakrishnan, Anand; Song, Inseok; Soummer, Remi; Tallis, Melisa; Thomas, Sandrine; Wallace, J. Kent; Ward-Duong, Kimberly; Wiktorowicz, Sloane; Wolff, Schuyler

doi:10.3847/1538-3881/ab4ef7

Title: Detection of a Low-mass Stellar Companion to the Accelerating A2IV Star HR 1645

Journal Article · Wed Nov 13 00:00:00 EST 2019 · The Astronomical Journal (Online)

DOI:https://doi.org/10.3847/1538-3881/ab4ef7· OSTI ID:1836915

;

; Doyon, Rene;

;

; Graham, James R.;

The ~500 Myr A2IV star HR 1645 has one of the most significant low-amplitude accelerations of nearby early-type stars measured from a comparison of the Hipparcos and Gaia astrometric catalogs. This signal is consistent with either a stellar companion with a moderate mass ratio (q ~ 0.5) on a short period (P < 1 yr), or a substellar companion at a separation wide enough to be resolved with ground-based high-contrast imaging instruments; long-period equal-mass ratio stellar companions that are also consistent with the measured acceleration are excluded with previous imaging observations. The small but significant amplitude of the acceleration made HR 1645 a promising candidate for targeted searches for brown dwarf and planetary-mass companions around nearby, young stars. In this paper we explore the origin of the astrometric acceleration by modeling the signal induced by a wide-orbit M8 companion discovered with the Gemini Planet Imager, as well as the effects of an inner short-period spectroscopic companion discovered a century ago but not since followed up. We present the first constraints on the orbit of the inner companion, and demonstrate that it is a plausible cause of the astrometric acceleration. This result demonstrates the importance of vetting of targets with measured astrometric acceleration for short-period stellar companions prior to conducting targeted direct imaging surveys for wide-orbit substellar companions.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Contributing Organization:: GPIES Survey Team

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1836915

Report Number(s):: LLNL-JRNL-829580; 1045535; TRN: US2300385

Journal Information:: The Astronomical Journal (Online), Vol. 158, Issue 6; ISSN 1538-3881

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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astrometry
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techniques: high angular resolution
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Title: Detection of a Low-mass Stellar Companion to the Accelerating A2IV Star HR 1645

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