A Method for Selecting M dwarfs with an Increased Likelihood of Unresolved Ultra-cool Companionship
| Autor: | Cook, N. J., Pinfield, D. J., Marocco, F., Burningham, B., Jones, H. R. A., Frith, J., Zhong, J., Luo, A. L., Qi, Z. X., Lucas, P. W., Gromadzki, M., Day-Jones, A. C., Kurtev, R. G., Guo, Y. X., Wang, Y. F., Bai, Y., Yi, Z. P., Smart, R. L. |
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| Rok vydání: | 2016 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1093/mnras/stw061 |
| Popis: | Locating ultra-cool companions to M dwarfs is important for constraining low-mass formation models, the measurement of sub-stellar dynamical masses and radii, and for testing ultra-cool evolutionary models. We present an optimised method for identifying M dwarfs which may have unresolved ultra-cool companions. We construct a catalogue of 440,694 candidates, from WISE, 2MASS and SDSS, based on optical and near-infrared colours and reduced proper motion. With strict reddening, photometric and quality constraints we isolate a sub-sample of 36,898 M dwarfs and search for possible mid-infrared M dwarf + ultra-cool dwarf candidates by comparing M dwarfs which have similar optical/near-infrared colours (chosen for their sensitivity to effective temperature and metallicity). We present 1,082 M dwarf + ultra-cool dwarf candidates for follow-up. Using simulated ultra-cool dwarf companions to M dwarfs, we estimate that the occurrence of unresolved ultra-cool companions amongst our M dwarf + ultra-cool dwarf candidates should be at least four times the average for our full M dwarf catalogue. We discuss possible contamination and bias and predict yields of candidates based on our simulations. Comment: 11 pages, 10 figures, (9 pages of appendices) accepted for publication in MNRAS |
| Databáze: | arXiv |
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