SIMBAD references

2023MNRAS.522.6055Z - Mon. Not. R. Astron. Soc., 522, 6055-6069 (2023/July-2)

KMT-2022-BLG-0440Lb: A new q < 10^–4 microlensing planet with the central-resonant caustic degeneracy broken.

ZHANG J., ZANG W., JUNG Y.K., YANG H., GOULD A., SUMI T., MAO S., DONG S. (The Leading Authors), ALBROW M.D., CHUNG S.-J., HAN C., HWANG K.-H., RYU Y.-H., SHIN I.-G., SHVARTZVALD Y., YEE J.C., 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), QIAN Q., LIU Z., MAOZ D., PENNY M.T., ZHU W. (The MAP and {mu}FUN Follow-up Teams), ABE F., BARRY R., BENNETT D.P., BHATTACHARYA A., BOND I.A., FUJII H., FUKUI A., HAMADA R., HIRAO Y., ISHITANI SILVA S., ITOW Y., KIRIKAWA R., KONDO I., KOSHIMOTO N., MATSUBARA Y., MATSUMOTO S., MIYAZAKI S., MURAKI Y., OKAMURA A., OLMSCHENK G., RANC C., RATTENBURY N.J., SATOH Y., SUZUKI D., TODA T., TOMOYOSHI M., TRISTRAM P.J., VANDOROU A., YAMA H., YAMASHITA K. (The MOA Collaboration)

Abstract (from CDS):

We present the observations and analysis of a high-magnification microlensing planetary event, KMT-2022-BLG-0440, for which the weak and short-lived planetary signal was covered by both the KMTNet survey and follow-up observations. The binary-lens models with a central caustic provide the best fits, with a planet/host mass ratio, q = 0.75-1.00 × 10^–4 at 1σ. The binary-lens models with a resonant caustic and a brown-dwarf mass ratio are both excluded by Δχ² > 70. The binary-source model can fit the anomaly well but is rejected by the 'colour argument' on the second source. From Bayesian analyses, it is estimated that the host star is likely a K or M dwarf located in the Galactic disc, the planet probably has a Neptune-mass, and the projected planet-host separation is $1.9^{+0.6}_{-0.7}$ or $4.6^{+1.4}_{-1.7}$ au, subject to the close/wide degeneracy. This is the third q < 10^–4 planet from a high-magnification planetary signal (A ≳ 65). Together with another such planet, KMT-2021-BLG-0171Lb, the ongoing follow-up program for the KMTNet high-magnification events has demonstrated its ability to detect high-magnification planetary signals for q < 10^–4 planets, which are challenging for the current microlensing surveys.

Journal keyword(s): gravitational lensing: micro - planets and satellites: detection

Simbad objects: 16

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