تقرير
A possible binary system of a stellar remnant in the high magnification gravitational microlensing event OGLE-2007-BLG-514
| العنوان: | A possible binary system of a stellar remnant in the high magnification gravitational microlensing event OGLE-2007-BLG-514 |
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| المؤلفون: | Miyake, N., Udalski, A., Sumi, T., Bennett, D. P., Dong, S., Street, R. A., Greenhill, J., Bond, I. A., Gould, A., Kubiak, M., Szymanski, M. K., Pietrzynski, G., Soszynski, I., Ulaczyk, K., Wyrzykowski, L., Abe, F., Fukui, A., Furusawa, K., Holderness, S., Itow, Y., Korpela, A., Ling, C. H., Masuda, K., Matsubara, Y., Muraki, Y., Nagayama, T., Ohnishi, K., Rattenbury, N., Saito, To., Sako, T., Sullivan, D. J., Sweatman, W. L., Tristram, P. J., Yock, P. C. M., Allen, W., Christie, G. W., DePoy, D. L., Gaudi, B. S., Han, C., Lee, C. -U., McCormick, J., Monard, B., Natusch, T., Park, B. -G., Pogge, R. W., Allan, A., Bode, M., Bramich, D. M., Clay, N., Dominik, M., Horne, K. D., Kains, N., Mottram, C., Snodgrass, C., Steele, I., Tsapras, Y., Albrow, M. D., Batista, V., Beaulieu, J. P., Brillant, S., Burgdorf, M., Caldwell, J. A. R., Cassan, A., Cole, A., Cook, K. H., Coutures, Ch., Dieters, S., Prester, D. Dominis, Donatowicz, J., Fouque, P., Jorgensen, U. G., Kane, S., Kubas, D., Marquette, J. B., Martin, R., Menzies, J., Pollard, K. R., Sahu, K. C., Wambsganss, J., Williams, A., Zub, M. |
| سنة النشر: | 2012 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Earth and Planetary Astrophysics |
| الوصف: | We report the extremely high magnification (A > 1000) binary microlensing event OGLE-2007-BLG-514. We obtained good coverage around the double peak structure in the light curve via follow-up observations from different observatories. The binary lens model that includes the effects of parallax (known orbital motion of the Earth) and orbital motion of the lens yields a binary lens mass ratio of q = 0.321 +/- 0.007 and a projected separation of s = 0.072 +/- 0.001$ in units of the Einstein radius. The parallax parameters allow us to determine the lens distance D_L = 3.11 +/- 0.39 kpc and total mass M_L=1.40 +/- 0.18 M_sun; this leads to the primary and secondary components having masses of M_1 = 1.06 +/- 0.13 M_sun and M_2 = 0.34 +/- 0.04 M_sun, respectively. The parallax model indicates that the binary lens system is likely constructed by the main sequence stars. On the other hand, we used a Bayesian analysis to estimate probability distributions by the model that includes the effects of xallarap (possible orbital motion of the source around a companion) and parallax (q = 0.270 +/- 0.005, s = 0.083 +/- 0.001). The primary component of the binary lens is relatively massive with M_1 = 0.9_{-0.3}^{+4.6} M_sun and it is at a distance of D_L = 2.6_{-0.9}^{+3.8} kpc. Given the secure mass ratio measurement, the companion mass is therefore M_2 = 0.2_{-0.1}^{+1.2} M_sun. The xallarap model implies that the primary lens is likely a stellar remnant, such as a white dwarf, a neutron star or a black hole. Comment: 31 pages, 6 figures, 7 tables, accepted in ApJ |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1088/0004-637X/752/2/82 |
| URL الوصول: | http://arxiv.org/abs/1207.1244 |
| رقم الأكسشن: | edsarx.1207.1244 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1088/0004-637X/752/2/82 |
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