@article{3aaab2ae56a44694b0f11d4c500a40f8,
title = "MagAO imaging of long-period objects (MILO). II. A puzzling white dwarf around the sun-like star HD 11112",
abstract = "HD 11112 is an old, Sun-like star that has a long-term radial velocity (RV) trend indicative of a massive companion on a wide orbit. Here we present direct images of the source responsible for the trend using the Magellan Adaptive Optics system. We detect the object (HD 11112B) at a separation of 2.″2 (100 au) at multiple wavelengths spanning 0.6-4 μm and show that it is most likely a gravitationally bound cool white dwarf. Modeling its spectral energy distribution suggests that its mass is 0.9-1.1 M o, which corresponds to very high eccentricity, near edge-on orbits from a Markov chain Monte Carlo analysis of the RV and imaging data together. The total age of the white dwarf is >2σ, which is discrepant with that of the primary star under most assumptions. The problem can be resolved if the white dwarf progenitor was initially a double white dwarf binary that then merged into the observed high-mass white dwarf. HD 11112B is a unique and intriguing benchmark object that can be used to calibrate atmospheric and evolutionary models of cool white dwarfs and should thus continue to be monitored by RV and direct imaging over the coming years.",
keywords = "instrumentation: adaptive optics, stars: individual (HD 11112), techniques: high angular resolution, techniques: radial velocities, white dwarfs",
author = "Rodigas, {Timothy J.} and P. Bergeron and Am{\'e}lie Simon and Pamela Arriagada and Faherty, {Jacqueline K.} and Guillem Anglada-Escud{\'e} and Mamajek, {Eric E.} and Alycia Weinberger and Butler, {R. Paul} and Males, {Jared R.} and Katie Morzinski and Close, {Laird M.} and Hinz, {Philip M.} and Jeremy Bailey and Brad Carter and Jenkins, {James S.} and Hugh Jones and Simon O'Toole and Tinney, {C. G.} and Rob Wittenmyer and John Debes",
note = "Funding Information: This work was supported in part by the NSERC Canada and by the Fund FRQ-NT (Qu{\'e}bec). T.J.R. acknowledges support for Program number HST-HF251366.001-A, provided by NASA through a Hubble Fellowship grant from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Incorporated, under NASA contract NAS5-26555. This publication makes use of data products from the Two Micron All Sky Survey, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by the National Aeronautics and Space Administration and the National Science Foundation. This publication also makes use of data products from the Widefield Infrared Survey Explorer, which is a joint project of the University of California, Los Angeles, and the Jet Propulsion Laboratory/California Institute of Technology, funded by the National Aeronautics and Space Administration. Publisher Copyright: {\textcopyright} 2016. The American Astronomical Society. All rights reserved.",
year = "2016",
month = nov,
day = "10",
doi = "10.3847/0004-637X/831/2/177",
language = "English (US)",
volume = "831",
journal = "Astrophysical Journal",
issn = "0004-637X",
publisher = "IOP Publishing Ltd.",
number = "2",
}