Real-time difference imaging analysis of moa galactic bulge observations during 2000

By I. Bond, F. Abe, R. Dodd, J. Hearnshaw, M. Honda, J. Jugaku, P. Kilmartin, A. Marles, K. Masuda, Y. Matsubara and 20 more. 2001

393 citations recorded by the source corpus.

We describe observations carried out by the MOA group of the Galactic bulge during 2000 that were designed to detect efficiently gravitational microlensing of faint stars in which the magnification is high and/or of short duration. These events are particularly useful for studies of extrasolar planets and faint stars. Approximately 17 deg2 were monitored at a sampling rate of up to six times per night. The images were analysed in real time using a difference imaging technique. 20 microlensing candidates were detected, of which eight were alerted to the microlensing community whilst in progress. Approximately half of the candidates had high magnifications (≳10), at least one had very high magnification (≳50), and one exhibited a clear parallax effect. The details of these events are reported here, together with details of the on-line difference imaging technique. Some nova-like events were also observed and these are described, together with one asteroid.

Subfields: Astronomy and Astrophysics

View Paper: https://www.semanticscholar.org/paper/30d6a8d30852c4865fd4207eb110c413006ce276

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Citations in the corpus

• OGLE-2003-BLG-262: Finite-Source Effects from a Point-Mass Lens (2003, methodology): “…Search (MPS, Rhie et al. 1999), and the Microlensing Follow-Up Network (µFUN, http://www.astronomy.ohio-state.edu/∼microfun/) intensively monitor alerts from EWS and also from the Microlensing Observations in Astrophysics collaboration (MOA, Bond et al. 2001), primarily to search for planets.”
• Microlensing Optical Depth toward the Galactic Bulge from Microlensing Observations in Astrophysics Group Observations during 2000 with Difference Image Analysis (2002, methodology): “The images were analyzed in real time at MJUO to issue alerts for the events (Bond et al. 2001).”
• A Low-Mass Planet with a Possible Sub-Stellar-Mass Host in Microlensing Event MOA-2007-BLG-192 (2008, background): “Continuing improvements in the MOA photometry and alert system (Bond et al. 2001) should allow a similar event to be alerted earlier in future seasons.”
• A Jovian-Mass Planet in Microlensing Event OGLE-2005-BLG-071 (2005, background): “We present data from OGLE (1.3 m telescope at Las Campanas Observatory in Chile, operated by the Carnegie Institution of Washington), MOA (0.6 m at Mount John Observatory in New Zealand),mFUN Chile (SMARTS 1.3 m telescope at CTIO), Palomar (60 inch [1.5 m] robotic telescope), MDM (Hiltner 2.4 m at K”
• The AAO/UKST SuperCOSMOS Hα survey (2005, background): “A special feature to create a difference image of each field following variable image psf matching techniques developed by Bond et al. (2001) also exists to permit large-scale resolved emission maps to be created with reduced artefacts from uncancelled stars.”
• First Microlens Mass Measurement: PLANET Photometry of EROS BLG-2000-5 (2001, background): “…several events by detecting the distortion in the light curve due to the annual parallax effect (Alcock et al. 1995; Mao 1999; Soszyński et al. 2001; Bond et al. 2001; Smith, Mao, & Woźniak 2001; Mao et al. 2002; Bennett et al. 2001) An & Gould (2001) argue thatπE is measurable for a…”
• OGLE 2003-BLG-235/MOA 2003-BLG-53: A Planetary Microlensing Event (2004, neutral): “OBSERVATIONS Presently, Galactic bulge microlensing events are discovered and then reported by the two independently operating survey groups OGLE (Udalski 2003) and MOA (Bond et al. 2001).”
• Variable stars in the Magellanic Clouds: results from OGLE and SIRIUS (2003, background): “Thanks to the gravitational microlensing search projects (OGLE, e.g., Udalski, Kubiak & Szymański 1997; MACHO, e.g., Alcock et al. 2000; EROS, e.g., Afonso et al. 1999; MOA, e.g., Bond et al. 2001), a large number of variable stars have been found in the Magellanic Clouds.”
• A COLD NEPTUNE-MASS PLANET OGLE-2007-BLG-368Lb: Cold neptunes are common (2009, methodology): “Other images were reduced by both the MOA DIA pipeline (Bond et al. 2001) and a version of pySIS (v3.”
• The Macquarie/AAO/Strasbourg Hα Planetary Nebula Catalogue: MASH (2006, methodology): “Many additional bulge PNe were discovered in this way by use of a sophisticated, innovative difference imaging technique developed by Bond et al. (2001).”