First assessment of the binary lens OGLE-2015_BLG-0232. (arXiv:1811.02715v1 [astro-ph.EP])

First assessment of the binary lens OGLE-2015_BLG-0232. (arXiv:1811.02715v1 [astro-ph.EP])
<a href="http://arxiv.org/find/astro-ph/1/au:+Bachelet_E/0/1/0/all/0/1">E. Bachelet</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Bozza_V/0/1/0/all/0/1">V. Bozza</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Han_C/0/1/0/all/0/1">C. Han</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Udalski_A/0/1/0/all/0/1">A. Udalski</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Bond_I/0/1/0/all/0/1">I.A. Bond</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Beaulieu_J/0/1/0/all/0/1">J.-P. Beaulieu</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Street_R/0/1/0/all/0/1">R.A. Street</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Kim_J/0/1/0/all/0/1">J.-I Kim</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Bramich_D/0/1/0/all/0/1">D. M. Bramich</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Cassan_A/0/1/0/all/0/1">A. Cassan</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Dominik_M/0/1/0/all/0/1">M. Dominik</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Jaimes_R/0/1/0/all/0/1">R. Figuera Jaimes</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Horne_K/0/1/0/all/0/1">K. Horne</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Hundertmark_M/0/1/0/all/0/1">M. Hundertmark</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Mao_S/0/1/0/all/0/1">S. Mao</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Menzies_J/0/1/0/all/0/1">J. Menzies</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Ranc_C/0/1/0/all/0/1">C. Ranc</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Schmidt_R/0/1/0/all/0/1">R. Schmidt</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Snodgrass_C/0/1/0/all/0/1">C. Snodgrass</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Steele_I/0/1/0/all/0/1">I. A. Steele</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Tsapras_Y/0/1/0/all/0/1">Y. Tsapras</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Wambsganss_J/0/1/0/all/0/1">J. Wambsganss</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Mroz_P/0/1/0/all/0/1">P. Mr&#xf3;z</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Soszynski_I/0/1/0/all/0/1">I. Soszy&#x144;ski</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Szymanski_M/0/1/0/all/0/1">M.K. Szyma&#x144;ski</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Skowron_J/0/1/0/all/0/1">J. Skowron</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Pietrukowicz_P/0/1/0/all/0/1">P. Pietrukowicz</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Kozlowski_S/0/1/0/all/0/1">S. Koz&#x142;owski</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Poleski_R/0/1/0/all/0/1">R. Poleski</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Ulaczyk_K/0/1/0/all/0/1">K. Ulaczyk</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Pawlak_M/0/1/0/all/0/1">M. Pawlak</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Abe_F/0/1/0/all/0/1">F. Abe</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Barry_R/0/1/0/all/0/1">R. Barry</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Bennett_D/0/1/0/all/0/1">D. P. Bennett</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Bhattacharya_A/0/1/0/all/0/1">A. Bhattacharya</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Donachie_M/0/1/0/all/0/1">M. Donachie</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Fukui_A/0/1/0/all/0/1">A. Fukui</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Hirao_Y/0/1/0/all/0/1">Y. Hirao</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Itow_Y/0/1/0/all/0/1">Y. Itow</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Kawasaki_K/0/1/0/all/0/1">K. Kawasaki</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Kondo_I/0/1/0/all/0/1">I. Kondo</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Koshimoto_N/0/1/0/all/0/1">N. Koshimoto</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Li_M/0/1/0/all/0/1">M. Cheung Alex Li</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Matsubara_Y/0/1/0/all/0/1">Y. Matsubara</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Muraki_Y/0/1/0/all/0/1">Y. Muraki</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Miyazaki_S/0/1/0/all/0/1">S. Miyazaki</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Nagakane_M/0/1/0/all/0/1">M. Nagakane</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Rattenbury_N/0/1/0/all/0/1">N. J. Rattenbury</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Suematsu_H/0/1/0/all/0/1">H. Suematsu</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Sullivan_D/0/1/0/all/0/1">D. J. Sullivan</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Sumi_T/0/1/0/all/0/1">T. Sumi</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Suzuki_D/0/1/0/all/0/1">D. Suzuki</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Tristram_P/0/1/0/all/0/1">P. J. Tristram</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Yonehara_A/0/1/0/all/0/1">A. Yonehara</a>

We present an analysis of the microlensing event OGLE-2015-BLG-0232. This
event is challenging to characterize for two reasons. First, the light curve is
not well sampled during the caustic crossing due to the proximity of the full
Moon impacting the photometry quality. Moreover, the source brightness is
difficult to estimate because this event is blended with a nearby K dwarf star.
We found that the light curve deviations are likely due to a close brown dwarf
companion (i.e., s = 0.55 and q = 0.06), but the exact nature of the lens is
still unknown. We finally discuss the potential of follow-up observations to
estimate the lens mass and distance in the future.

We present an analysis of the microlensing event OGLE-2015-BLG-0232. This
event is challenging to characterize for two reasons. First, the light curve is
not well sampled during the caustic crossing due to the proximity of the full
Moon impacting the photometry quality. Moreover, the source brightness is
difficult to estimate because this event is blended with a nearby K dwarf star.
We found that the light curve deviations are likely due to a close brown dwarf
companion (i.e., s = 0.55 and q = 0.06), but the exact nature of the lens is
still unknown. We finally discuss the potential of follow-up observations to
estimate the lens mass and distance in the future.

http://arxiv.org/icons/sfx.gif

Comments are closed.