– Niels Bohr Institute - University of Copenhagen

Spitzer Observations of OGLE-2015-BLG-1212 Reveal a New Path toward Breaking Strong Microlens Degeneracies

Research output: Contribution to journalJournal articleResearchpeer-review

V. Bozza, Y. Shvartzvald, A. Udalski, S. Calchi Novati, I. A. Bond, C. Han, M. Hundertmark, R. Poleski, M. Pawlak, M. K. Szymański, J. Skowron, P. Mróz, Ł. Wyrzykowski, P. Pietrukowicz, K. Ulaczyk, C. Beichman, G. Bryden, S. Carey, M. Fausnaugh, B. S. Gaudi & 73 others A. Gould, C. B. Henderson, B. Wibking, W. Zhu, Y. Asakura, R. K. Barry, D. P. Bennett, A. Bhattacharya, M. Donachie, M. Freeman, A. Fukui, Y. Hirao, K. Inayama, Y. Itow, N. Koshimoto, M. C. A. Li, C. H. Ling, K. Masuda, Y. Matsubara, Y. Muraki, M. Nagakane, T. Nishioka, K. Ohnishi, H. Oyokawa, N. Rattenbury, To. Saito, A. Sharan, T. Sumi, D. Suzuki, A. Yonehara, J.-Y. Choi, H. Park, Y. K. Jung, I.-G. Shin, M. D. Albrow, B.-G. Park, S.-L. Kim, C.-U. Lee, S.-M. Cha, D.-J. Kim, Y. Lee, KMTNet Group, M. Dominik, U. G. Jørgensen, Michael Ingemann Andersen, D. M. Bramich, M. J. Burgdorf, S. Ciceri, G. D'Ago, D. F. Evans, R. Figuera Jaimes, S.-H. Gu, T. C. Hinse, N. Kains, E. Kerins, H. Korhonen, M. Kuffmeier, L. Mancini, A. Popovas, M. Rabus, S. Rahvar, R. T. Rasmussen, G. Scarpetta, Jesper Mirsa Skottfelt, C. Snodgrass, J. Southworth, J. Surdej, E. Unda-Sanzana, C. von Essen, D. Maoz, M. Friedmann, S. Kaspi, Wise Group

Spitzer microlensing parallax observations of OGLE-2015-BLG-1212 decisively break a degeneracy between planetary and binary solutions that is somewhat ambiguous when only ground-based data are considered. Only eight viable models survive out of an initial set of 32 local minima in the parameter space. These models clearly indicate that the lens is a stellar binary system possibly located within the bulge of our Galaxy, ruling out the planetary alternative. We argue that several types of discrete degeneracies can be broken via such space-based parallax observations.
Original languageEnglish
Article number79
JournalThe Astrophysical Journal
Issue number1
StatePublished - 1 Mar 2016

    Research areas

  • binaries: general, Galaxy: bulge, gravitational lensing: micro, planets and satellites: detection, space vehicles

ID: 170454403