SPITZER AS A MICROLENS PARALLAX SATELLITE: MASS AND DISTANCE MEASUREMENTS OF BINARY LENS SYSTEM OGLE-2014-BLG-1050L

Zhu, Wei; Udalski, A.; Gould, A.; Dominik, M.; Bozza, Valerio; Han, C.; Yee, J. C.; Calchi Novati, Sebastiano; Beichman, C. A.; Carey, S.; Poleski, R.; Skowron, J.; Kozłowski, S.; Mróz, P.; Pietrukowicz, P.; Pietrzyński, G.; Szymański, M. K.; Soszyński, I.; Ulaczyk, K.; Wyrzykowski, Ł.; Gaudi, B. S.; Pogge, R. W.; Depoy, D. L.; Jung, Y. K.; Choi, J. Y.; Hwang, K. H.; Shin, I. G.; Park, H.; Jeong, J.

doi:10.1088/0004-637X/805/1/8

We report the first mass and distance measurements of a caustic-crossing binary system OGLE-2014-BLG-1050 L using the space-based microlens parallax method. Spitzer captured the second caustic crossing of the event, which occurred ~10 days before that seen from Earth. Due to the coincidence that the source-lens relative motion was almost parallel to the direction of the binary-lens axis, the fourfold degeneracy, which was known before only to occur in single-lens events, persists in this case, leading to either a lower-mass (0.2 and 0.07 ${{M}_{\odot }}$) binary at ~1.1 kpc or a higher-mass (0.9 and 0.35 ${{M}_{\odot }}$) binary at ~3.5 kpc. However, the latter solution is strongly preferred for reasons including blending and lensing probability. OGLE-2014-BLG-1050 L demonstrates the power of microlens parallax in probing stellar and substellar binaries.

Titolo:	SPITZER AS A MICROLENS PARALLAX SATELLITE: MASS AND DISTANCE MEASUREMENTS OF BINARY LENS SYSTEM OGLE-2014-BLG-1050L
Autori:	Zhu, Wei Udalski, A. Gould, A. Dominik, M. BOZZA, Valerio Han, C. Yee, J. C. CALCHI NOVATI, Sebastiano Beichman, C. A. Carey, S. Poleski, R. Skowron, J. Kozłowski, S. Mróz, P. Pietrukowicz, P. Pietrzyński, G. Szymański, M. K. Soszyński, I. Ulaczyk, K. Wyrzykowski, Ł. Gaudi, B. S. Pogge, R. W. Depoy, D. L. Jung, Y. K. Choi, J. Y. Hwang, K. H. Shin, I. G. Park, H. Jeong, J. mostra contributor esterni nascondi contributor esterni
Data di pubblicazione:	2015
Rivista:	THE ASTROPHYSICAL JOURNAL
Abstract:	We report the first mass and distance measurements of a caustic-crossing binary system OGLE-2014-BLG-1050 L using the space-based microlens parallax method. Spitzer captured the second caustic crossing of the event, which occurred ~10 days before that seen from Earth. Due to the coincidence that the source-lens relative motion was almost parallel to the direction of the binary-lens axis, the fourfold degeneracy, which was known before only to occur in single-lens events, persists in this case, leading to either a lower-mass (0.2 and 0.07 ${{M}_{\odot }}$) binary at ~1.1 kpc or a higher-mass (0.9 and 0.35 ${{M}_{\odot }}$) binary at ~3.5 kpc. However, the latter solution is strongly preferred for reasons including blending and lensing probability. OGLE-2014-BLG-1050 L demonstrates the power of microlens parallax in probing stellar and substellar binaries.
Handle:	http://hdl.handle.net/11386/4644698
Appare nelle tipologie:	1.1.1 Articolo su rivista con DOI

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