HIP 67506 C: MagAO-X confirmation of a new low-mass stellar companion to HIP 67506 A
Weinberger, Alycia J.; Guyon, Olivier; Close, Laird M.; Males, Jared R.; Morzinski, Katie M.; Pearce, Logan A.; Long, Joseph D.; Hinz, Philip M.; Schatz, Lauren; Haffert, Sebastiaan Y.; Hedglen, Alexander D.; Kautz, Maggie; Lumbres, Jennifer; McLeod, Avalon L.; Van Gorkom, Kyle; Kueny, Jay; Knight, Justin M.; Rodack, Alex; Gasho, Victor; Foster, Warren
United States, Australia, Japan
Abstract
We report the confirmation of HIP 67506 C, a new stellar companion to HIP 67506 A. We previously reported a candidate signal at 2λ/D (240 mas) in L' in MagAO/Clio imaging using the binary differential imaging technique. Several additional indirect signals showed that the candidate signal merited follow-up: significant astrometric acceleration in Gaia DR3, Hipparcos-Gaia proper motion anomaly, and overluminosity compared to single main-sequence stars. We confirmed the companion, HIP 67506 C, at 0.1 arcsec with MagAO-X in 2022 April. We characterized HIP 67506 C MagAO-X photometry and astrometry, and estimated spectral-type K7-M2; we also re-evaluated HIP 67506 A in light of the close companion. Additionally, we show that a previously identified 9 arcsec companion, HIP 67506 B, is a much further distant unassociated background star. We also discuss the utility of indirect signposts in identifying small inner working angle candidate companions.