Observation of the First Gravitational Microlensing Event in a Sparse Stellar Field: The Tago Event

Fukui, A.; Abe, F.; Ayani, K.; Fujii, M.; Iizuka, Ryo; Itow, Y.; Kabumoto, K.; Kamiya, K.; Kawabata, Tetsuya; Kawanomoto, Satoshi; Kinugasa, K.; Koff, R. A.; Krajci, Thomas; Naito, H.; Nogami, Daisaku; Narusawa, S.; Ohishi, N.; Ohnishi, Kouhei; Sumi, T.; Tsumuraya, Fumiaki

doi:10.1086/522296

Cited by 15 publications

(13 citation statements)

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“…Observations along the lines that we discuss will constrain the nomad population of the disc relative to the bulge, and will also more generally improve the star-star microlensing event rate in the disc and the solar neighbourhood, about which very little is now known (Fukui et al 2007;Gaudi et al 2008;Rahal et al 2009). Further, they will improve our understanding of the mass function of lowmass brown dwarfs and super-Jupiters, and the distinction between these classes of objects (Spiegel, Burrows & Milsom 2011).…”

Section: Discussion a N D C O N C L U S I O N Smentioning

confidence: 99%

Nomads of the Galaxy

Strigari

Barnabè

Marshall

et al. 2012

Monthly Notices of the Royal Astronomical Society

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We estimate that there may be up to ~10^5 compact objects in the mass range 10^{-8} -10^{-2} solar mass per main sequence star that are unbound to a host star in the Galaxy. We refer to these objects as nomads; in the literature a subset of these are sometimes called free-floating or rogue planets. Our estimate for the number of Galactic nomads is consistent with a smooth extrapolation of the mass function of unbound objects above the Jupiter-mass scale, the stellar mass density limit, and the metallicity of the interstellar medium. We analyze the prospects for detecting nomads via Galactic microlensing. The Wide-Field Infrared Survey Telescope (WFIRST) will measure the number of nomads per main sequence star greater than the mass of Jupiter to ~ 13%, and the corresponding number greater than the mass of Mars to ~25%. All-sky surveys such as GAIA and LSST can identify nomads greater than about the mass of Jupiter. We suggest a dedicated drift scanning telescope that covers approximately 100 square degrees in the Southern hemisphere could identify nomads as small as 10^{-8} solar mass via microlensing of bright stars with characteristic lightcurve timescales of a few seconds.Comment: 10 pages, 6 figure

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Section: Discussion a N D C O N C L U S I O N Smentioning

confidence: 99%

Nomads of the Galaxy

Strigari

Barnabè

Marshall

et al. 2012

Monthly Notices of the Royal Astronomical Society

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“…Second, Gaudi et al (2008b) analyzed a microlensing event of a nearby (1 kpc), bright (V = 11) source serendipitously discovered by an amateur astronomer hunting for comets, finding that it was most likely a low-mass star or brown dwarf moving at roughly 100 km s −1 . Based on the low rate of such events (and the non-systematic character of the search), they concluded that they were "probably lucky ... but perhaps not unreasonably so" to have found this event (see also Fukui et al 2007). Finally, Faherty et al (2009) found 14 high-velocity objects in a sample of 332 M, L, and T dwarfs, which are consistent with thickdisk or halo kinematics.…”

Section: Discussionmentioning

confidence: 99%

The Extreme Microlensing Event Ogle-2007-BLG-224: Terrestrial Parallax Observation of a Thick-Disk Brown Dwarf

Gould¹,

Udalski²,

Monard³

et al. 2009

ApJ

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134

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“…In addition, lensing of stars in our own Galaxy will also be observed. To illustrate, we note that limited monitoring has already discovered the lensing of an A0 star just one kpc away by an unknown intervening mass (Fukui et al 2007;Gaudi et al 2008).…”

Section: What Does Lsst Bring To These Studies?mentioning

confidence: 99%

LSST Science Book, Version 2.0

Abell¹,

Burke²,

Hamuy³

et al. 2009

552

653

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Prepared by the LSST Science Collaborations, with contributions from the LSST Project. PrefaceMajor advances in our understanding of the Universe over the history of astronomy have often arisen from dramatic improvements in our ability to observe the sky to greater depth, in previously unexplored wavebands, with higher precision, or with improved spatial, spectral, or temporal resolution. Aided by rapid progress in information technology, current sky surveys are again changing the way we view and study the Universe, and the next-generation instruments, and the surveys that will be made with them, will maintain this revolutionary progress. Substantial progress in the important scientific problems of the next decade (determining the nature of dark energy and dark matter, studying the evolution of galaxies and the structure of our own Milky Way, opening up the time domain to discover faint variable objects, and mapping both the inner and outer Solar System) all require wide-field repeated deep imaging of the sky in optical bands.The wide-fast-deep science requirement leads to a single wide-field telescope and camera which can repeatedly survey the sky with deep short exposures. The Large Synoptic Survey Telescope (LSST), a dedicated telecope with an effective aperture of 6.7 meters and a field of view of 9.6 deg 2 , will make major contributions to all these scientific areas and more. It will carry out a survey of 20,000 deg 2 of the sky in six broad photometric bands, imaging each region of sky roughly 2000 times (1000 pairs of back-to-back 15-sec exposures) over a ten-year survey lifetime.The LSST project will deliver fully calibrated survey data to the United States scientific community and the public with no proprietary period. Near real-time alerts for transients will also be provided worldwide. A goal is worldwide participation in all data products. The survey will enable comprehensive exploration of the Solar System beyond the Kuiper Belt, new understanding of the structure of our Galaxy and that of the Local Group, and vast opportunities in cosmology and galaxy evolution using data for billions of distant galaxies. Since many of these science programs will involve the use of the world's largest non-proprietary database, a key goal is maximizing the usability of the data. Experience with previous surveys is that often their most exciting scientific results were unanticipated at the time that the survey was designed; we fully expect this to be the case for the LSST as well.The purpose of this Science Book is to examine and document in detail science goals, opportunities, and capabilities that will be provided by the LSST. The book addresses key questions that will be confronted by the LSST survey, and it poses new questions to be addressed by future study. It contains previously available material (including a number of White Papers submitted to the ASTRO2010 Decadal Survey) as well as new results from a year-long campaign of study and evaluation. This book does not attempt to be complete; there are many ...

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Observation of the First Gravitational Microlensing Event in a Sparse Stellar Field: The Tago Event

Cited by 15 publications

References 15 publications

Nomads of the Galaxy

Nomads of the Galaxy

The Extreme Microlensing Event Ogle-2007-BLG-224: Terrestrial Parallax Observation of a Thick-Disk Brown Dwarf

LSST Science Book, Version 2.0

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