MagAO imaging of long-period objects (MILO). II. A puzzling white dwarf around the sun-like star HD 11112
Article
Article Title | MagAO imaging of long-period objects (MILO). II. A puzzling white dwarf around the sun-like star HD 11112 |
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ERA Journal ID | 1057 |
Article Category | Article |
Authors | Rodigas, Timothy J. (Author), Bergeron, P. (Author), Simon, Amelie (Author), Arriagada, Pamela (Author), Faherty, Jacqueline K. (Author), Anglada-Escude, Guillem (Author), Mamajak, Eric E. (Author), Weinberger, Alycia (Author), Butler, R. Paul (Author), Males, Jared R. (Author), Morzinski, Katie (Author), Close, Laird M. (Author), Hinz, Philip M. (Author), Bailey, Jeremy (Author), Carter, Brad (Author), Jenkins, James S. (Author), Jones, Hugh (Author), O'Toole, Simon (Author), Tinney, C. G. (Author), Wittenmyer, Rob (Author) and Debes, John (Author) |
Journal Title | The Astrophysical Journal: an international review of astronomy and astronomical physics |
Journal Citation | 831 (2) |
Article Number | 177 |
Number of Pages | 10 |
Year | 2016 |
Publisher | IOP Publishing |
Place of Publication | United States |
ISSN | 0004-637X |
1538-4357 | |
Digital Object Identifier (DOI) | https://doi.org/10.3847/0004-637X/831/2/177 |
Web Address (URL) | https://iopscience.iop.org/article/10.3847/0004-637X/831/2/177 |
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 ⊙, 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 | adaptive optics; high angular resolution; radial velocity; stars; HD 11112; binaries; white dwarfs |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Public Notes | File reproduced in accordance with the copyright policy of the publisher/author. |
Byline Affiliations | Carnegie Institution of Washington, United States |
University of Montreal, Canada | |
University of London, United Kingdom | |
University of Rochester, United States | |
University of Arizona, United States | |
University of New South Wales | |
Computational Engineering and Science Research Centre | |
University of Chile, Chile | |
University of Hertfordshire, United Kingdom | |
Australian Astronomical Observatory, Australia | |
Space Telescope Science Institute, United States | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q3x22/magao-imaging-of-long-period-objects-milo-ii-a-puzzling-white-dwarf-around-the-sun-like-star-hd-11112
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