SIMBAD references

2018AJ....155..261C - Astron. J., 155, 261-261 (2018/June-0)

Spitzer opens new path to break classic degeneracy for Jupiter-mass microlensing planet OGLE-2017-BLG-1140Lb.

CALCHI NOVATI S., SKOWRON J., JUNG Y.K., BEICHMAN C., BRYDEN G., CAREY S., GAUDI B.S., HENDERSON C.B., SHVARTZVALD Y., YEE J.C., ZHU W. (The Spitzer Team), UDALSKI A., SZYMANSKI M.K., MROZ P., POLESKI R., SOSZYNSKI I., KOZLOWSKI S., PIETRUKOWICZ P., ULACZYK K., PAWLAK M., RYBICKI K., IWANEK P. (The OGLE Collaboration), ALBROW M.D., CHUNG S.-J., GOULD A., HAN C., HWANG K.-H., RYU Y.-H., SHIN I.-G., ZANG W., CHA S.-M., KIM D.-J., KIM H.-W., KIM S.-L., LEE C.-U., LEE D.-J., LEE Y., PARK B.-G., POGGE R.W. (The KMTNet Collaboration)

Abstract (from CDS):

We analyze the combined Spitzer and ground-based data for OGLE-2017-BLG-1140 and show that the event was generated by a Jupiter-class (m_p≃1.6M_Jup) planet orbiting a mid-late M dwarf (M≃0.2M_☉) that lies D_LS≃1.0kpc in the foreground of the microlensed Galactic-bar source star. The planet-host projected separation is a_⊥≃1.0au, i.e., well beyond the snow line. By measuring the source proper motion µ_s from ongoing long-term OGLE imaging and combining this with the lens-source relative proper motion µ_rel derived from the microlensing solution, we show that the lens proper motion µ_l=µ_rel+µ_s is consistent with the lens lying in the Galactic disk, although a bulge lens is not ruled out. We show that while the Spitzer and ground-based data are comparably well fitted by planetary (i.e., binary-lens (2L1S)) and binary-source (1L2S) models, the combination of Spitzer and ground-based data decisively favors the planetary model. This is a new channel to resolve the 2L1S/1L2S degeneracy, which can be difficult to break in some cases.

Journal keyword(s): gravitational lensing: micro

Simbad objects: 15

Full paper

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