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.

Bozza, V., Shvartzvald, Y., Udalski, A., Novati, S.c., Bond, I.a., Han, C., et al. (2016). SPITZER OBSERVATIONS of OGLE-2015-BLG-1212 REVEAL A NEW PATH TOWARD BREAKING STRONG MICROLENS DEGENERACIES. THE ASTROPHYSICAL JOURNAL, 820(1), 79 [10.3847/0004-637X/820/1/79].

SPITZER OBSERVATIONS of OGLE-2015-BLG-1212 REVEAL A NEW PATH TOWARD BREAKING STRONG MICROLENS DEGENERACIES

Mancini L.;
2016-01-01

Abstract

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.
2016
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore FIS/05 - ASTRONOMIA E ASTROFISICA
English
Bozza, V., Shvartzvald, Y., Udalski, A., Novati, S.c., Bond, I.a., Han, C., et al. (2016). SPITZER OBSERVATIONS of OGLE-2015-BLG-1212 REVEAL A NEW PATH TOWARD BREAKING STRONG MICROLENS DEGENERACIES. THE ASTROPHYSICAL JOURNAL, 820(1), 79 [10.3847/0004-637X/820/1/79].
Bozza, V; Shvartzvald, Y; Udalski, A; Novati, Sc; Bond, Ia; Han, C; Hundertmark, M; Poleski, R; Pawlak, M; Szymanski, Mk; Skowron, J; Mroz, P; Kozlows...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/204835
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