2021AJ....162..180Y

Query : 2021AJ....162..180Y

2021AJ....162..180Y - Astron. J., 162, 180-180 (2021/November-0)

OGLE-2019-BLG-0960 lb: the smallest microlensing planet.

YEE J.C., ZANG W., UDALSKI A., RYU Y.-H., GREEN J., HENNERLEY S., MARMONT A., SUMI T., MAO S. (The Leading Authors), GROMADZKI M., MROZ P., SKOWRON J., POLESKI R., SZYMANSKI M.K., SOSZYNSKI I., PIETRUKOWICZ P., KOZLOWSKI S., ULACZYK K., RYBICKI K.A., IWANEK P., WRONA M. (The OGLE Collaboration), ALBROW M.D., CHUNG S.-J., GOULD A., HAN C., HWANG K.-H., JUNG Y.K., KIM H.-W., SHIN I.-G., SHVARTZVALD Y., CHA S.-M., KIM D.-J., KIM S.-L., LEE C.-U., LEE D.-J., LEE Y., PARK B.-G., POGGE R.W. (The KMTNet Collaboration), BACHELET E., CHRISTIE G., HUNDERTMARK M.P.G., MAOZ D., McCORMICK J., NATUSCH T., PENNY M.T., STREET R.A., TSAPRAS Y. (The LCO and mFUN Follow-up Teams), BEICHMAN C.A., BRYDEN G., NOVATI S.C., CAREY S., GAUDI B.S., HENDERSON C.B., JOHNSON S., ZHU W. (The Spitzer Team), BOND I.A., ABE F., BARRY R., BENNETT D.P., BHATTACHARYA A., DONACHIE M., FUJII H., FUKUI A., HIRAO Y., ISHITANI SILVA S., ITOW Y., KIRIKAWA R., KONDO I., KOSHIMOTO N., ALEX LI M.C., MATSUBARA Y., MURAKI Y., MIYAZAKI S., OLMSCHENK G., RANC C., RATTENBURY N.J., SATOH Y., SHOJI H., SUZUKI D., TANAKA Y., TRISTRAM P.J., YAMAWAKI T., YONEHARA A. (The MOA Collaboration)

Abstract (from CDS):

We report the analysis of OGLE-2019-BLG-0960, which contains the smallest mass-ratio microlensing planet found to date (q = 1.2-1.6 x 10–5 at 1σ). Although there is substantial uncertainty in the satellite parallax measured by Spitzer, the measurement of the annual parallax effect combined with the finite source effect allows us to determine the mass of the host star (ML = 0.3-0.6 M☉), the mass of its planet (mp = 1.4-3.1 M⊕), the projected separation between the host and planet (a⊥ = 1.2-2.3 au), and the distance to the lens system (DL = 0.6-1.2 kpc). The lens is plausibly the blend, which could be checked with adaptive optics observations. As the smallest planet clearly below the break in the mass-ratio function, it demonstrates that current experiments are powerful enough to robustly measure the slope of the mass-ratio function below that break. We find that the cross-section for detecting small planets is maximized for planets with separations just outside of the boundary for resonant caustics and that sensitivity to such planets can be maximized by intensively monitoring events whenever they are magnified by a factor A > 5. Finally, an empirical investigation demonstrates that most planets showing a degeneracy between (s > 1) and (s < 1) solutions are not in the regime (| logs| ≫0) for which the "close"/"wide" degeneracy was derived. This investigation suggests that there is a link between the "close"/"wide" and "inner/outer" degeneracies and also that the symmetry in the lens equation goes much deeper than symmetries uncovered for the limiting cases.

Abstract Copyright: © 2021. The American Astronomical Society. All rights reserved.

Journal keyword(s): Gravitational microlensing exoplanet detection

Simbad objects: 16

goto Full paper

goto View the references in ADS

Number of rows : 16
N Identifier Otype ICRS (2000)
RA 		ICRS (2000)
DEC 		Proper motions Parallaxes Redshift Rad. vel. cz Mag U Mag B Mag V Mag R Mag I Sp type Morph. type Angular size #ref
1983 - 2024
1 MACHO LMC 1 Star 05 14 44.4 -68 48 00 ~ ~ ~           ~ ~ ~ ~ ~ 35
2 KMT-2018-BLG-0029 Star 17 37 52.670 -27 59 04.92 ~ ~ ~           ~ ~ ~ ~ ~ 16
3 KMT-2018-BLG-0029b Planet_Candidate 17 37 52.670 -27 59 04.92 ~ ~ ~           ~ ~ ~ ~ ~ 11
4 KMT-2016-BLG-1089 Star 17 42 23.31 -33 45 35.2 ~ ~ ~           ~ ~ ~ ~ ~ 9
5 OGLE-2005-BLG-071 Star 17 50 09.77 -34 40 23.5 ~ ~ ~           ~ ~ ~ ~ ~ 58
6 KMT-2019-BLG-0842b Planet_Candidate 17 53 50.030 -29 52 38.78 ~ ~ ~           ~ ~ ~ ~ ~ 9
7 OGLE-2019-BLG-0763 Star 17 53 50.030 -29 52 38.78 ~ ~ ~           ~ ~ ~ ~ ~ 8
8 KMT-2016-BLG-1816 Star 17 54 58.130 -29 45 01.67 ~ ~ ~           ~ ~ ~ ~ ~ 9
9 MOA 2016-BLG-350b Planet 17 55 23.50 -30 12 26.1 ~ ~ ~           ~ ~ ~ ~ ~ 19
10 OGLE-2017-BLG-0406 Star 17 55 59.92 -29 51 47.3 ~ ~ ~           ~ ~ ~ ~ ~ 8
11 OGLE-2008-BLG-279 Star 17 58 36.17 -30 22 08.4 ~ ~ ~           GV ~ ~ ~ ~ 20
12 KMT-2018-BLG-1025 Star 17 59 27.940 -27 52 41.02 ~ ~ ~           ~ ~ ~ ~ ~ 9
13 OGLE-2002-BUL-055 PlanetaryNeb 17 59 40.93 -27 07 18.2 ~ ~ ~           ~ ~ ~ ~ ~ 12
14 OGLE-2018-BLG-0799 Star 18 13 50.16 -25 29 08.6 ~ ~ ~           ~ ~ ~ ~ ~ 5
15 NAME EWS 2019-BLG-0960b Planet_Candidate 18 16 03.43 -25 46 28.8 ~ ~ ~           ~ ~ ~ ~ ~ 8
16 OGLE-2019-BLG-0960 Star 18 16 03.43 -25 46 28.8 ~ ~ ~           ~ ~ ~ ~ ~ 9

To bookmark this query, right click on this link: simbad:objects in 2021AJ....162..180Y and select 'bookmark this link' or equivalent in the popup menu