Microlensing Constraints on Low-Mass Companions
| dc.creator | Gaudi, B. Scott | |
| dc.date | 2002-06-27 | |
| dc.date | 2002-07-02 | |
| dc.date.accessioned | 2026-07-07T02:04:05Z | |
| dc.date.available | 2026-07-07T02:04:05Z | |
| dc.description | Microlensing is sensitive to binary, brown dwarf, and planetary companions to normal stars in the Galactic bulge with separations between about 1-10 AU. The accurate, densely-sampled photometry of microlensing events needed to detect planetary companions has been achieved by several follow-up collaborations. Detailed analysis of microlensing events toward the bulge demonstrates that less than 45% of M-dwarfs in the bulge have Jupiter-mass companions between 1 and 5 AU. Detection of binary and brown-dwarf companions using microlensing is considerably easier; however, the interpretation is hampered by their non-perturbative influence on the parent lightcurve. I demonstrate that ~25% of brown-dwarf companions with separations 1-10 AU should be detectable with survey-quality data (~1 day sampling and ~5% photometry). Survey data is more amenable to generic, brute-force analysis methods and less prone to selection biases. An analysis of the ~1500 microlensing events detected by OGLE-III in the next three years should test whether the BD desert exists at separations 1-10 AU from M-dwarfs in the Galactic bulge. | |
| dc.description | 4 pages, 1 figure, to appear in the proceedings of the IAU Symposium 211, "Brown Dwarfs", ASP Conference Series | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0206494 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0206494 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/4616 | |
| dc.subject | Astrophysics | |
| dc.title | Microlensing Constraints on Low-Mass Companions | |
| dc.type | text |