2015ApJ...814..111S

Query : 2015ApJ...814..111S

2015ApJ...814..111S - Astrophys. J., 814, 111 (2015/December-1)

Spitzer microlens measurement of a massive remnant in a well-separated binary.

SHVARTZVALD Y., UDALSKI A., GOULD A., HAN C., BOZZA V., FRIEDMANN M., HUNDERTMARK M., BEICHMAN C., BRYDEN G., CALCHI NOVATI S., CAREY S., FAUSNAUGH M., GAUDI B.S., HENDERSON C.B., KERR T., POGGE R.W., VARRICATT W., WIBKING B., YEE J.C., ZHU W. (The Spitzer Team), POLESKI R., PAWLAK M., SZYMANSKI M.K., SKOWRON J., MROZ P., KOZLOWSKI S., WYRZYKOWSKI L., PIETRUKOWICZ P., PIETRZYNSKI G., SOSZYNSKI I., ULACZYK K. (The OGLE Group), CHOI J.-Y., PARK H., JUNG Y.K., SHIN I.-G., ALBROW M.D., PARK B.-G., KIM S.-L., LEE C.-U., CHA S.-M., KIM D.-J., LEE Y. (The KMTNet Group), MAOZ D., KASPI S. (The WISE Group), STREET R.A., TSAPRAS Y., BACHELET E., DOMINIK M., BRAMICH D.M., HORNE K., SNODGRASS C., STEELE I.A., MENZIES J., FIGUERA JAIMES R., WAMBSGANSS J., SCHMIDT R., CASSAN A., RANC C., MAO S., DONG S. (The RoboNet Group), D'AGO G., SCARPETTA G., VERMA P., JORGENSEN U.G., KERINS E., SKOTTFELT J. (The MiNDSTEp Group)

Abstract (from CDS):

We report the detection and mass measurement of a binary lens OGLE-2015-BLG-1285La,b, with the more massive component having M1> 1.35 M☉(80% probability). A main-sequence star in this mass range is ruled out by limits on blue light, meaning that a primary in this mass range must be a neutron star (NS) or black hole (BH). The system has a projected separation r⊥= 6.1±0.4 AU and lies in the Galactic bulge. These measurements are based on the ''microlens parallax'' effect, i.e., comparing the microlensing light curve as seen from Spitzer, which lay at 1.25 AU projected from Earth, to the light curves from four ground-based surveys, three in the optical and one in the near-infrared. Future adaptive optics imaging of the companion by 30 m class telescopes will yield a much more accurate measurement of the primary mass. This discovery both opens the path and defines the challenges to detecting and characterizing BHs and NSs in wide binaries, with either dark or luminous companions. In particular, we discuss lessons that can be applied to future Spitzer and Kepler K2 microlensing parallax observations.

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Journal keyword(s): binaries: general - black hole physics - Galaxy: bulge - gravitational lensing: micro - stars: neutron

Simbad objects: 9

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Number of rows : 9
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 OGLE-2005-SMC-001 BD? 00 40 28.50 -73 44 46.1           ~ 21 0
2 OGLE-2015-BLG-1285 * 17 39 23.25 -27 49 13.0           ~ 5 0
3 OGLE-2014-BLG-1050 BD? 17 45 07.83 -22 54 20.0           ~ 8 0
4 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
5 MACHO 98-BLG-6 * 17 57 32.8 -28 42 45     19.5     G5IV 21 0
6 MACHO 104.20906.3973 * 18 05 02.5 -27 42 17           ~ 27 0
7 OGLE BUL-SC33 164492 * 18 05 05.28 -28 34 41.7           ~ 38 0
8 OGLE-2005-BLG-169 * 18 06 05.32 -30 43 57.5     20.4     ~ 68 1
9 NAME Galactic Bulge reg ~ ~           ~ 4794 0

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