MOA 2003-BLG-37: A Bulge Jerk-Parallax Microlens Degeneracy Academic Article uri icon


  • We analyze the Galactic bulge microlensing event MOA 2003-BLG-37. Although the Einstein timescale is relatively short, tE = 43 days, the light curve displays deviations consistent with parallax effects due to the Earth's accelerated motion. We show that the 2 surface has four distinct local minima that are induced by the "jerk-parallax" degeneracy, with pairs of solutions having projected Einstein radii rE = 1.76 and 1.28 AU, respectively. This is the second event displaying such a degeneracy and the first toward the Galactic bulge. For both events, the jerk-parallax formalism accurately describes the offsets between the different solutions, giving hope that when extra solutions exist in future events they can easily be found. However, the morphologies of the 2 surfaces for the two events are quite different, implying that much remains to be understood about this degeneracy.

published proceedings

  • The Astrophysical Journal

author list (cited authors)

  • Park, B., DePoy, D. L., Gaudi, B. S., Gould, A., Han, C., Pogge, R. W., ... Yock, P.

citation count

  • 42

complete list of authors

  • Park, B‐G||DePoy, DL||Gaudi, BS||Gould, A||Han, C||Pogge, RW||Abe, F||Bennett, DP||Bond, IA||Eguchi, S||Furuta, Y||Hearnshaw, JB||Kamiya, K||Kilmartin, PM||Kurata, Y||Masuda, K||Matsubara, Y||Muraki, Y||Noda, S||Okajima, K||Rattenbury, NJ||Sako, T||Sekiguchi, T||Sullivan, DJ||Sumi, T||Tristram, PJ||Yanagisawa, T||Yock, PCM

publication date

  • July 2004