Astronomical research project
The Microlensing Observations in Astrophysics (MOA) telescope dome at the top ofMount John Observatory . Microlensing Observations in Astrophysics (MOA ) is a collaborative project between researchers in New Zealand[ 1] [ 2] Nagoya University .[ 3] microlensing to observedark matter ,extra-solar planets , andstellar atmospheres from theSouthern Hemisphere . The group concentrates especially on the detection and observation ofgravitational microlensing events of high magnification, of order 100 or more, as these provide the greatest sensitivity to extrasolar planets. They work with other groups inAustralia , theUnited States and elsewhere. Observations are conducted at New Zealand'sMt. John University Observatory using a 1.8 m (70.9 in)reflector telescope built for the project.[ 4]
In September 2020, astronomers usingmicrolensing techniques reported the detection, for the first time, of anearth-mass rogue planet unbounded by any star, and free floating in theMilky Way galaxy .[ 5] [ 6] Optical Gravitational Lensing Experiment (OGLE) they reported in a preprint the firstrogue BH [ 7] [ 8] [ 9] [ 10] [ 11]
MOA telescope mirror images [ edit ] Underside of main mirror
Camera assembly
Main mirror, side view
The following planets have been announced by this survey, some in conjunction with other surveys.
^ Staff (1995)."MOA (Microlensing observation in Astrophysics)" (PDF) .Caltech . Retrieved3 October 2020 . ^ Yock, Philip (2012). "Review article - A quarter century of astrophysics with Japan".New Zealand Science Review 69 (3).arXiv :1510.05688 ^ Latham, David W.; Gaudi, B. Scott (2014)."Microlensing Observations in Astrophysics" (PDF) .Encyclopedia of Astrobiology . p. 1.doi :10.1007/978-3-642-27833-4_1850-2 .ISBN 978-3-642-27833-4 . Retrieved3 October 2020 . {{cite book }}:|work= ignored (help )^ Sumi, T.; et al. (1 July 2003)."Microlensing Optical Depth toward the Galactic Bulge from Microlensing Observations in Astrophysics Group Observations during 2000 with Difference Image Analysis" .The Astrophysical Journal 591 (1):204– 227.arXiv :astro-ph/0207604 Bibcode :2003ApJ...591..204S .doi :10.1086/375212 .S2CID 118776894 . Retrieved3 October 2020 . ^ Gough, Evan (1 October 2020)."A Rogue Earth-Mass Planet Has Been Discovered Freely Floating in the Milky Way Without a Star" .Universe Today . Retrieved2 October 2020 . ^ Mroz, Przemek; et al. (29 September 2020)."A terrestrial-mass rogue planet candidate detected in the shortest-timescale microlensing event" .The Astrophysical Journal .903 (1): L11.arXiv :2009.12377 Bibcode :2020ApJ...903L..11M .doi :10.3847/2041-8213/abbfad S2CID 221971000 . ^ Sahu, Kailash C.; Anderson, Jay; Casertano, Stefano; Bond, Howard E.; Udalski, Andrzej; Dominik, Martin; Calamida, Annalisa; Bellini, Andrea; Brown, Thomas M.; Rejkuba, Marina; Bajaj, Varun (25 May 2022)."An Isolated Stellar-mass Black Hole Detected through Astrometric Microlensing" .The Astrophysical Journal .933 (1): 83.arXiv :2201.13296 Bibcode :2022ApJ...933...83S .doi :10.3847/1538-4357/ac739e S2CID 246430448 . ^ Lam, Casey Y.; Lu, Jessica R.; Udalski, Andrzej; Bond, Ian; Bennett, David P.; Skowron, Jan; Mroz, Przemek; Poleski, Radek; Sumi, Takahiro; Szymanski, Michal K.; Kozlowski, Szymon (31 May 2022)."An Isolated Mass-gap Black Hole or Neutron Star Detected with Astrometric Microlensing" .The Astrophysical Journal Letters .933 (1): L23.arXiv :2202.01903 Bibcode :2022ApJ...933L..23L .doi :10.3847/2041-8213/ac7442 S2CID 246608178 . ^ Gianopoulos, Andrea (7 June 2022)."Hubble Determines Mass of Isolated Black Hole Roaming Milky Way" .NASA . Retrieved12 June 2022 . ^ O'Callaghan, Jonathan."Astronomers Find First Ever Rogue Black Hole Adrift in the Milky Way" .Scientific American . Retrieved8 February 2022 . ^ Bennett, D. P.; Becker, A. C.; Quinn, J. L.; Tomaney, A. B.; Alcock, C.; Allsman, R. A.; Alves, D. R.; Axelrod, T. S.; Calitz, J. J.; Cook, K. H.; Drake, A. J. (10 November 2002)."Gravitational Microlensing Events Due to Stellar-Mass Black Holes" .The Astrophysical Journal .579 (2):639– 659.arXiv :astro-ph/0109467 Bibcode :2002ApJ...579..639B .doi :10.1086/342225 .ISSN 0004-637X .S2CID 44193135 .
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