2020AJ....159...76M

Query : 2020AJ....159...76M

2020AJ....159...76M - Astron. J., 159, 76-76 (2020/February-0)

OGLE-2013-BLG-0911Lb: a secondary on the brown-dwarf planet boundary around an M dwarf.

MIYAZAKI S., SUMI T., BENNETT D.P., UDALSKI A., SHVARTZVALD Y., STREET R., BOZZA V., YEE J.C., BOND I.A., RATTENBURY N., KOSHIMOTO N., SUZUKI D., FUKUI A., ABE F., BHATTACHARYA A., BARRY R., DONACHIE M., FUJII H., HIRAO Y., ITOW Y., KAMEI Y., KONDO I., LI M.C.A., LING C.H., MATSUBARA Y., MATSUO T., MURAKI Y., NAGAKANE M., OHNISHI K., RANC C., SAITO T., SHARAN A., SHIBAI H., SUEMATSU H., SULLIVAN D.J., TRISTRAM P.J., YAMAKAWA T., YONEHARA A. (The MOA Collaboration), SKOWRON J., POLESKI R., MROZ P., SZYMANSKI M.K., SOSZYNSKI I., PIETRUKOWICZ P., KOZLOWSKI S., ULACZYK K., WYRZYKOWSKI L. (The OGLE Collaboration), FRIEDMANN M., KASPI S., MAOZ D. (The WISE Team), ALBROW M., CHRISTIE G., DEPOY D.L., GAL-YAM A., GOULD A., LEE C.-U., MANULIS I., McCORMICK J., NATUSCH T., NGAN H., POGGE R.W., PORRITT I. (The {mu}FUN Collaboration), TSAPRAS Y., BACHELET E., HUNDERTMARK M.P.G., DOMINIK M., BRAMICH D.M., CASSAN A., FIGUERA JAIMES R., HORNE K., SCHMIDT R., SNODGRASS C., WAMBSGANSS J., STEELE I.A., MENZIES J., MAO S. (The RoboNet Collaboration), JORGENSEN U.G., BURGDORF M.J., CICERI S., CALCHI NOVATI S., D'AGO G., EVANS D.F., HINSE T.C., KAINS N., KERINS E., KORHONEN H., MANCINI L., POPOVAS A., RABUS M., RAHVAR S., SCARPETTA G., SKOTTFELT J., SOUTHWORTH J., D'AGO G., PEIXINHO N., VERMA P. (The MiNDSTEp Collaboration)

Abstract (from CDS):

We present the analysis of the binary-lens microlensing event OGLE-2013-BLG-0911. The best-fit solutions indicate the binary mass ratio of q ≃ 0.03, which differs from that reported in Shvartzvald et al. The event suffers from the well-known close/wide degeneracy, resulting in two groups of solutions for the projected separation normalized by the Einstein radius of s ∼ 0.15 or s ∼ 7. The finite source and the parallax observations allow us to measure the lens physical parameters. The lens system is an M dwarf orbited by a massive Jupiter companion at very close (Mhost=0.30–0.06+0.08M☉, Mcomp=10.1–2.2+2.9MJup, aexp=0.40–0.04+0.05au) or wide (Mhost=0.28–0.08+0.10M☉, Mcomp=9.9–3.5+3.8MJup, aexp=18.0–3.2+3.2au) separation. Although the mass ratio is slightly above the planet-brown dwarf (BD) mass-ratio boundary of q = 0.03, which is generally used, the median physical mass of the companion is slightly below the planet-BD mass boundary of 13MJup. It is likely that the formation mechanisms for BDs and planets are different and the objects near the boundaries could have been formed by either mechanism. It is important to probe the distribution of such companions with masses of ∼13MJup in order to statistically constrain the formation theories for both BDs and massive planets. In particular, the microlensing method is able to probe the distribution around low-mass M dwarfs and even BDs, which is challenging for other exoplanet detection methods.

Abstract Copyright: © 2020. The American Astronomical Society. All rights reserved.

Journal keyword(s): Gravitational microlensing - Exoplanet astronomy - Brown dwarfs - Exoplanet systems - Exoplanets - Extrasolar gas giants - Exoplanet detection methods - M dwarf stars

Simbad objects: 4

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Number of rows : 4
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 MOA 2013-BLG-551 * 17 55 31.980 -29 15 13.80           ~ 13 0
2 MOA 2013-BLG-551b Pl 17 55 31.980 -29 15 13.80           ~ 4 0
3 NAME Baade Window reg 18 03.5 -30 01           ~ 643 3
4 NAME Galactic Bulge reg ~ ~           ~ 4794 0

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