2024ApJ...975..216R

Query : 2024ApJ...975..216R

2024ApJ...975..216R - Astrophys. J., 975, 216 (2024/November-2)

Analysis of the Full Spitzer Microlensing Sample. I. Dark Remnant Candidates and Gaia Predictions.

RYBICKI K.A., SHVARTZVALD Y., YEE J.C., CALCHI NOVATI S., OFEK E.O., BOND I.A., BEICHMAN C., BRYDEN G., CAREY S., HENDERSON C., ZHU W., FAUSNAUGH M.M., WIBKING B. (The Spitzer Team), UDALSKI A., POLESKI R., MROZ P., SZYMANSKI M.K., SOSZYNSKI I., PIETRUKOWICZ P., KOZLOWSKI S., SKOWRON J., ULACZYK K., IWANEK P., WRONA M. (The OGLE Collaboration), RYU Y.-H., ALBROW M.D., CHUNG S.-J., GOULD A., HAN C., HWANG K.-H., JUNG Y.K., SHIN I.-G., YANG H., 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), ABE F., BARRY R., BENNETT D.P., BHATTACHARYA A., FUKUI A., HAMADA R., HAMADA S., HAMASAKI N., HIRAO Y., ISHITANI SILVA S., ITOW Y., KIRIKAWA R., KOSHIMOTO N., MATSUBARA Y., MIYAZAKI S., MURAKI Y., NAGAI T., NUNOTA K., OLMSCHENK G., RANC C., RATTENBURY N.J., SATOH Y.K., SUMI T., SUZUKI D., TRISTRAM P.J., VANDOROU A., YAMA H. (The MOA Collaboration), WYRZYKOWSKI L., HOWIL K. and KRUSZYNSKA K.

Abstract (from CDS):

In the pursuit of understanding the population of stellar remnants within the Milky Way, we analyze the sample of ∼950 microlensing events observed by the Spitzer Space Telescope between 2014 and 2019. In this study we focus on a subsample of nine microlensing events, selected based on their long timescales, small microlensing parallaxes, and joint observations by the Gaia mission, to increase the probability that the chosen lenses are massive and the mass is measurable. Among the selected events we identify lensing black holes and neutron star candidates, with potential confirmation through forthcoming release of the Gaia time-series astrometry in 2026. Utilizing Bayesian analysis and Galactic models, along with the Gaia Data Release 3 proper-motion data, four good candidates for dark remnants were identified: OGLE-2016-BLG-0293, OGLE-2018-BLG-0483, OGLE-2018-BLG-0662, and OGLE-2015-BLG-0149, with lens masses of ${3.0}_{-1.3}^{+1.8}\,{M}_{\odot }$, ${4.7}_{-2.1}^{+3.2}\,{M}_{\odot }$, ${3.15}_{-0.64}^{+0.66}\,{M}_{\odot }$ and ${1.40}_{-0.55}^{+0.75}\,{M}_{\odot }$, respectively. Notably, the first two candidates are expected to exhibit astrometric microlensing signals detectable by Gaia, offering the prospect of validating the lens masses. The methodologies developed in this work will be applied to the full Spitzer microlensing sample, populating and analyzing the timescale (tE) versus parallax (πE) diagram to derive constraints on the population of lenses in general and massive remnants in particular.

Abstract Copyright: © 2024. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Astrometric microlensing effect - Gravitational microlensing - Satellite microlensing parallax - Microlensing parallax - Black holes - Neutron stars - Stellar remnants - Gaia - Stellar masses

Simbad objects: 13

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Number of rows : 13
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 AT 2019dqb ev 12 37 32.560 -66 06 40.90           ~ 13 0
2 OGLE BLG615.12 122 * 17 24 35.8668620587 -30 07 56.715713328           ~ 3 0
3 OGLE BLG662.5 6243 * 17 29 26.1860835549 -30 58 54.300529321           ~ 4 0
4 SN 2018auz SN* 17 30 34.0194876974 -27 29 30.563580638           SNIa 2 0
5 OGLE-2019-BLG-0169 * 17 43 56.5430149657 -32 52 15.364600849           ~ 1 0
6 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
7 OGLE-2018-BLG-0662 * 17 47 30.6172405248 -32 31 27.809543127           ~ 1 0
8 OGLE-2016-BLG-0293 * 17 52 38.7368002625 -32 29 22.446356600           ~ 2 0
9 2MASS J18004268-3509146 * 18 00 42.6792400290 -35 09 14.601098428           ~ 3 0
10 OGLE-2015-BLG-0149 * 18 01 09.1678629600 -32 33 27.739733838           ~ 4 0
11 OGLE-2018-BLG-0410 * 18 08 54.6522520680 -27 10 10.966843748           ~ 1 0
12 UCAC4 601-089725 ** 19 40 01.1354321437 +30 07 53.453174121       15.69   K5 24 1
13 NAME Galactic Bulge reg ~ ~           ~ 4794 0

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