Discovery of a Very Bright, Nearby Gravitational Microlensing Event
We report the serendipitous detection of a very bright, very nearby microlensing event. In late 2006 October, an otherwise unremarkable A0 star at a distance of [image]1 kpc (GSC 3656-1328) brightened achromatically by a factor of nearly 40 over the span of several days and then decayed in an appare...
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| Veröffentlicht in: | The Astrophysical journal 2008-04, Vol.677 (2), p.1268-1277 |
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| creator | Gaudi, B. Scott Patterson, Joseph Spiegel, David S Krajci, Thomas Koff, R Pojmański, G Dong, Subo Gould, Andrew Prieto, Jose L Blake, Cullen H Roming, Peter W. A Bennett, David P Bloom, Joshua S Boyd, David Eyler, Michael E de Ponthière, Pierre Mirabal, N Morgan, Christopher W Remillard, Ronald R Vanmunster, T Wagner, R. Mark Watson, Linda C |
| description | We report the serendipitous detection of a very bright, very nearby microlensing event. In late 2006 October, an otherwise unremarkable A0 star at a distance of [image]1 kpc (GSC 3656-1328) brightened achromatically by a factor of nearly 40 over the span of several days and then decayed in an apparently symmetrical way. We present a light curve of the event based on optical photometry from the Center for Backyard Astrophysics and the All Sky Automated Survey, as well as near-infrared photometry from the Peters Automated Infrared Imaging Telescope. This light curve is well fit by a generic microlensing model. We also report optical spectra and Swift X- ray and UV observations that are consistent with the microlensing interpretation. We discuss and reject alternative explanations for this variability. The lens star is probably a low-mass star or brown dwarf, with a relatively high proper motion of [image]20 mas yr super(-1), and may be visible using precise optical/infrared imaging taken several years from now. A modest, all-sky survey telescope could detect [image]10 such events per year, which would enable searches for very low mass planetary companions to relatively nearby stars. |
| doi_str_mv | 10.1086/529482 |
| format | Article |
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Scott ; Patterson, Joseph ; Spiegel, David S ; Krajci, Thomas ; Koff, R ; Pojmański, G ; Dong, Subo ; Gould, Andrew ; Prieto, Jose L ; Blake, Cullen H ; Roming, Peter W. A ; Bennett, David P ; Bloom, Joshua S ; Boyd, David ; Eyler, Michael E ; de Ponthière, Pierre ; Mirabal, N ; Morgan, Christopher W ; Remillard, Ronald R ; Vanmunster, T ; Wagner, R. Mark ; Watson, Linda C</creator><creatorcontrib>Gaudi, B. Scott ; Patterson, Joseph ; Spiegel, David S ; Krajci, Thomas ; Koff, R ; Pojmański, G ; Dong, Subo ; Gould, Andrew ; Prieto, Jose L ; Blake, Cullen H ; Roming, Peter W. A ; Bennett, David P ; Bloom, Joshua S ; Boyd, David ; Eyler, Michael E ; de Ponthière, Pierre ; Mirabal, N ; Morgan, Christopher W ; Remillard, Ronald R ; Vanmunster, T ; Wagner, R. Mark ; Watson, Linda C</creatorcontrib><description>We report the serendipitous detection of a very bright, very nearby microlensing event. In late 2006 October, an otherwise unremarkable A0 star at a distance of [image]1 kpc (GSC 3656-1328) brightened achromatically by a factor of nearly 40 over the span of several days and then decayed in an apparently symmetrical way. We present a light curve of the event based on optical photometry from the Center for Backyard Astrophysics and the All Sky Automated Survey, as well as near-infrared photometry from the Peters Automated Infrared Imaging Telescope. This light curve is well fit by a generic microlensing model. We also report optical spectra and Swift X- ray and UV observations that are consistent with the microlensing interpretation. We discuss and reject alternative explanations for this variability. The lens star is probably a low-mass star or brown dwarf, with a relatively high proper motion of [image]20 mas yr super(-1), and may be visible using precise optical/infrared imaging taken several years from now. 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Mark</creatorcontrib><creatorcontrib>Watson, Linda C</creatorcontrib><title>Discovery of a Very Bright, Nearby Gravitational Microlensing Event</title><title>The Astrophysical journal</title><description>We report the serendipitous detection of a very bright, very nearby microlensing event. In late 2006 October, an otherwise unremarkable A0 star at a distance of [image]1 kpc (GSC 3656-1328) brightened achromatically by a factor of nearly 40 over the span of several days and then decayed in an apparently symmetrical way. We present a light curve of the event based on optical photometry from the Center for Backyard Astrophysics and the All Sky Automated Survey, as well as near-infrared photometry from the Peters Automated Infrared Imaging Telescope. This light curve is well fit by a generic microlensing model. We also report optical spectra and Swift X- ray and UV observations that are consistent with the microlensing interpretation. We discuss and reject alternative explanations for this variability. The lens star is probably a low-mass star or brown dwarf, with a relatively high proper motion of [image]20 mas yr super(-1), and may be visible using precise optical/infrared imaging taken several years from now. A modest, all-sky survey telescope could detect [image]10 such events per year, which would enable searches for very low mass planetary companions to relatively nearby stars.</description><subject>Astronomy</subject><subject>Earth, ocean, space</subject><subject>Exact sciences and technology</subject><issn>0004-637X</issn><issn>1538-4357</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2008</creationdate><recordtype>article</recordtype><recordid>eNp90MtLwzAcB_AgCs6pf0M9qAet5tHmcdQ5pzD1ouItpHnMSG1r0g3239uyMUTBUxLy4ff4AnCI4AWCnF7mWGQcb4EByglPM5KzbTCAEGYpJextF-zF-NE_sRADMLrxUdcLG5ZJ7RKVvPa36-Bn7-158mhVKJbJJKiFb1Xr60qVyYPXoS5tFX01S8YLW7X7YMepMtqD9TkEL7fj59FdOn2a3I-upqnOGG1Ta4gwmeFFUWQCEpsbobngVBNnuTUQCm6EUwWGLhfYsAxzTQR1zFCumDJkCE5XdZtQf81tbOVnN7wtS1XZeh4lywjikFLayZN_JRIE5ZT9gN1OMQbrZBP8pwpLiaDs05SrNDt4vK6oolalC6rSPm40hligPBedO1s5Xzeb3z5t2YcvKWMSS4Qpl41xnT76q391_gZuHoqM</recordid><startdate>20080420</startdate><enddate>20080420</enddate><creator>Gaudi, B. 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A</au><au>Bennett, David P</au><au>Bloom, Joshua S</au><au>Boyd, David</au><au>Eyler, Michael E</au><au>de Ponthière, Pierre</au><au>Mirabal, N</au><au>Morgan, Christopher W</au><au>Remillard, Ronald R</au><au>Vanmunster, T</au><au>Wagner, R. Mark</au><au>Watson, Linda C</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Discovery of a Very Bright, Nearby Gravitational Microlensing Event</atitle><jtitle>The Astrophysical journal</jtitle><date>2008-04-20</date><risdate>2008</risdate><volume>677</volume><issue>2</issue><spage>1268</spage><epage>1277</epage><pages>1268-1277</pages><issn>0004-637X</issn><eissn>1538-4357</eissn><coden>ASJOAB</coden><abstract>We report the serendipitous detection of a very bright, very nearby microlensing event. In late 2006 October, an otherwise unremarkable A0 star at a distance of [image]1 kpc (GSC 3656-1328) brightened achromatically by a factor of nearly 40 over the span of several days and then decayed in an apparently symmetrical way. We present a light curve of the event based on optical photometry from the Center for Backyard Astrophysics and the All Sky Automated Survey, as well as near-infrared photometry from the Peters Automated Infrared Imaging Telescope. This light curve is well fit by a generic microlensing model. We also report optical spectra and Swift X- ray and UV observations that are consistent with the microlensing interpretation. We discuss and reject alternative explanations for this variability. The lens star is probably a low-mass star or brown dwarf, with a relatively high proper motion of [image]20 mas yr super(-1), and may be visible using precise optical/infrared imaging taken several years from now. 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| title | Discovery of a Very Bright, Nearby Gravitational Microlensing Event |
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