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        MagAO Imaging of Long-period Objects (MILO). II. A Puzzling White Dwarf around the Sun-like Star HD 11112

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        Rodigas_2016_ApJ_831_177.pdf (PDF, 2Mb)
        Author
        Rodigas, Timothy J.
        Bergeron, P.
        Simon, Amelie
        Arriagada, Pamela
        Faherty, Jackie
        Anglada-Escude, Guillem
        Mamajek, Eric E.
        Weinberger, Alycia
        Butler, R. Paul
        Males, Jared R.
        Morzinski, Katie
        Close, Laird M.
        Hinz, Philip M.
        Bailey, Jeremy
        Carter, Brad
        Jenkins, James S.
        Jones, Hugh
        O'Toole, Simon
        Tinney, C. G.
        Wittenmyer, Rob
        Debes, John
        Attention
        2299/17509
        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\fasec 2 (100 AU) at multiple wavelengths spanning 0.6-4 \microns ~and show that it is most likely a gravitationally-bound cool white dwarf. Modeling its spectral energy distribution (SED) suggests that its mass is 0.9-1.1 \msun, which corresponds to very high-eccentricity, near edge-on orbits from Markov chain Monte Carlo analysis of the RV and imaging data together. The total age of the white dwarf is $>2\sigma$ 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.
        Publication date
        2016-11-10
        Published in
        The Astrophysical Journal
        Published version
        https://doi.org/10.3847/0004-637X/831/2/177
        Other links
        http://hdl.handle.net/2299/17509
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