Candidate Brown-dwarf Microlensing Events with Very Short Timescales and Small Angular Einstein Radii
Short-timescale microlensing events are likely to be produced by substellar brown dwarfs (BDs), but it is difficult to securely identify BD lenses based on only event timescales because short-timescale events can also be produced by stellar lenses with high relative lens-source proper motions. In th...
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| Veröffentlicht in: | The Astronomical journal 2020-04, Vol.159 (4), p.134 |
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| creator | Han, Cheongho Lee, Chung Uk Udalski, Andrzej Gould, Andrew Bond, Ian A. Bozza, Valerio Albrow, Michael D. Chung, Sun Ju Hwang, Kyu Ha Jung, Youn Kil Ryu, Yoon-Hyun Shin, In Gu Shvartzvald, Yossi Yee, Jennifer C. Zang, Weicheng Cha, Sang Mok Kim, Dong-Jin Kim, Hyoun Woo Kim, Seung Lee Lee, Dong-Joo Lee, Yongseok Park, Byeong Gon Pogge, Richard W. Jee, M. James Kim, Doeon Mroz, Przemek Szymański, Michal K. Skowron, Jan Poleski, Radek Soszynski, Igor Pietrukowicz, Pawel Kozłowski, Szymon Ulaczyk, Krzysztof Rybicki, Krzysztof A. Iwanek, Patryk Wrona, Marcin Abe, Fumio Richardson, Barry Bennett, David P. Bhattacharya, Aparna Donachie, Martin Fujii, Hirosane Fukui, Akihiko Itow, Yoshitaka Hirao, Yuki Kamei, Yuhei Kondo, Iona Koshimoto, Naoki Li, Man Cheung Alex Matsubara, Yutaka Muraki, Yasushi Miyazaki, Shota Nagakane, Masayuki Ranc, Clement Rattenbury, Nicholas J. Satoh, Yuki Shoji, Hikaru Suematsu, Haruno Sullivan, Denis J. Sumi, Takahiro Suzuki, Daisuke Tristram, Paul J. Yamakawa, Takeharu Yamawaki, Tsubasa Yonehara, and Atsunori |
| description | Short-timescale microlensing events are likely to be produced by substellar brown dwarfs (BDs), but it is difficult to securely identify BD lenses based on only event timescales because short-timescale events can also be produced by stellar lenses with high relative lens-source proper motions. In this paper, we report three strong candidate BD-lens events found from the search for lensing events not only with short timescales (t(E) ≲ 6 days) but also with very small angular Einstein radii (θ(E) ≲ 0.05 mas) among the events that have been found in the 2016–2019 observing seasons. These events include MOA-2017-BLG-147, MOA-2017-BLG-241, and MOA-2019-BLG-256, in which the first two events are produced by single lenses and the last event is produced by a binary lens. From the Monte Carlo simulations of Galactic events conducted with the combined t(E) and θ(E) constraint, it is estimated that the lens masses of the individual events are 0.051 (sup +0.100, sub -0.027) M(ʘ), 0.044 (sup +0.090, sub -0.023) M(ʘ), and 0.046 (sup +0.067, sub -0.023) M(ʘ)/0.038 (sup +0.056, sub -0.019) M(ʘ) and the probability of the lens mass smaller than the lower limit of stars is ~80% for all events. We point out that routine lens mass measurements of short-timescale lensing events require survey-mode space-based observations. |
| doi_str_mv | 10.3847/1538-3881/ab6f66 |
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James ; Kim, Doeon ; Mroz, Przemek ; Szymański, Michal K. ; Skowron, Jan ; Poleski, Radek ; Soszynski, Igor ; Pietrukowicz, Pawel ; Kozłowski, Szymon ; Ulaczyk, Krzysztof ; Rybicki, Krzysztof A. ; Iwanek, Patryk ; Wrona, Marcin ; Abe, Fumio ; Richardson, Barry ; Bennett, David P. ; Bhattacharya, Aparna ; Donachie, Martin ; Fujii, Hirosane ; Fukui, Akihiko ; Itow, Yoshitaka ; Hirao, Yuki ; Kamei, Yuhei ; Kondo, Iona ; Koshimoto, Naoki ; Li, Man Cheung Alex ; Matsubara, Yutaka ; Muraki, Yasushi ; Miyazaki, Shota ; Nagakane, Masayuki ; Ranc, Clement ; Rattenbury, Nicholas J. ; Satoh, Yuki ; Shoji, Hikaru ; Suematsu, Haruno ; Sullivan, Denis J. ; Sumi, Takahiro ; Suzuki, Daisuke ; Tristram, Paul J. ; Yamakawa, Takeharu ; Yamawaki, Tsubasa ; Yonehara, and Atsunori</creator><creatorcontrib>Han, Cheongho ; Lee, Chung Uk ; Udalski, Andrzej ; Gould, Andrew ; Bond, Ian A. ; Bozza, Valerio ; Albrow, Michael D. ; Chung, Sun Ju ; Hwang, Kyu Ha ; Jung, Youn Kil ; Ryu, Yoon-Hyun ; Shin, In Gu ; Shvartzvald, Yossi ; Yee, Jennifer C. ; Zang, Weicheng ; Cha, Sang Mok ; Kim, Dong-Jin ; Kim, Hyoun Woo ; Kim, Seung Lee ; Lee, Dong-Joo ; Lee, Yongseok ; Park, Byeong Gon ; Pogge, Richard W. ; Jee, M. James ; Kim, Doeon ; Mroz, Przemek ; Szymański, Michal K. ; Skowron, Jan ; Poleski, Radek ; Soszynski, Igor ; Pietrukowicz, Pawel ; Kozłowski, Szymon ; Ulaczyk, Krzysztof ; Rybicki, Krzysztof A. ; Iwanek, Patryk ; Wrona, Marcin ; Abe, Fumio ; Richardson, Barry ; Bennett, David P. ; Bhattacharya, Aparna ; Donachie, Martin ; Fujii, Hirosane ; Fukui, Akihiko ; Itow, Yoshitaka ; Hirao, Yuki ; Kamei, Yuhei ; Kondo, Iona ; Koshimoto, Naoki ; Li, Man Cheung Alex ; Matsubara, Yutaka ; Muraki, Yasushi ; Miyazaki, Shota ; Nagakane, Masayuki ; Ranc, Clement ; Rattenbury, Nicholas J. ; Satoh, Yuki ; Shoji, Hikaru ; Suematsu, Haruno ; Sullivan, Denis J. ; Sumi, Takahiro ; Suzuki, Daisuke ; Tristram, Paul J. ; Yamakawa, Takeharu ; Yamawaki, Tsubasa ; Yonehara, and Atsunori ; The MOA Collaboration ; The KMTNet Collaboration ; The OGLE Collaboration ; LEADING AUTHORS</creatorcontrib><description>Short-timescale microlensing events are likely to be produced by substellar brown dwarfs (BDs), but it is difficult to securely identify BD lenses based on only event timescales because short-timescale events can also be produced by stellar lenses with high relative lens-source proper motions. In this paper, we report three strong candidate BD-lens events found from the search for lensing events not only with short timescales (t(E) ≲ 6 days) but also with very small angular Einstein radii (θ(E) ≲ 0.05 mas) among the events that have been found in the 2016–2019 observing seasons. These events include MOA-2017-BLG-147, MOA-2017-BLG-241, and MOA-2019-BLG-256, in which the first two events are produced by single lenses and the last event is produced by a binary lens. From the Monte Carlo simulations of Galactic events conducted with the combined t(E) and θ(E) constraint, it is estimated that the lens masses of the individual events are 0.051 (sup +0.100, sub -0.027) M(ʘ), 0.044 (sup +0.090, sub -0.023) M(ʘ), and 0.046 (sup +0.067, sub -0.023) M(ʘ)/0.038 (sup +0.056, sub -0.019) M(ʘ) and the probability of the lens mass smaller than the lower limit of stars is ~80% for all events. We point out that routine lens mass measurements of short-timescale lensing events require survey-mode space-based observations.</description><identifier>ISSN: 0004-6256</identifier><identifier>ISSN: 1538-3881</identifier><identifier>EISSN: 1538-3881</identifier><identifier>DOI: 10.3847/1538-3881/ab6f66</identifier><language>eng</language><publisher>Goddard Space Flight Center: The American Astronomical Society</publisher><subject>Astronomy ; Astrophysics ; ASTROPHYSICS, COSMOLOGY AND ASTRONOMY ; Binary stars ; Brown dwarf stars ; Computer simulation ; COMPUTERIZED SIMULATION ; DWARF STARS ; GALAXIES ; Lenses ; MASS ; Microlenses ; MONTE CARLO METHOD ; PROBABILITY ; PROPER MOTION ; SPACE ; Time</subject><ispartof>The Astronomical journal, 2020-04, Vol.159 (4), p.134</ispartof><rights>Copyright Determination: MAY_INCLUDE_COPYRIGHT_MATERIAL</rights><rights>Copyright IOP Publishing Apr 2020</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c362t-55d71174a4da174e581f5e385c5d725e7eee9382a8e85b1b1e90b71063385ac63</citedby><cites>FETCH-LOGICAL-c362t-55d71174a4da174e581f5e385c5d725e7eee9382a8e85b1b1e90b71063385ac63</cites><orcidid>0000-0002-2641-9964 ; 0000-0002-2335-1730 ; 0000-0003-4590-0136 ; 0000-0002-5843-9433 ; 0000-0001-6000-3463 ; 0000-0002-6212-7221 ; 0000-0001-5069-319X ; 0000-0001-9818-1513 ; 0000-0003-2388-4534 ; 0000-0001-8043-8413 ; 0000-0003-2302-9562 ; 0000-0001-9481-7123 ; 0000-0003-1435-3053 ; 0000-0001-6364-408X ; 0000-0002-8198-1968 ; 0000-0001-9823-2907 ; 0000-0002-4909-5763 ; 0000-0001-6285-4528 ; 0000-0003-1525-5041 ; 0000-0002-3401-1029 ; 0000-0002-9241-4117 ; 0000-0002-2339-5899 ; 0000-0002-4355-9838</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>230,314,780,784,800,885,27924,27925</link.rule.ids><backlink>$$Uhttps://www.osti.gov/biblio/23013146$$D View this record in Osti.gov$$Hfree_for_read</backlink></links><search><creatorcontrib>Han, Cheongho</creatorcontrib><creatorcontrib>Lee, Chung Uk</creatorcontrib><creatorcontrib>Udalski, Andrzej</creatorcontrib><creatorcontrib>Gould, Andrew</creatorcontrib><creatorcontrib>Bond, Ian A.</creatorcontrib><creatorcontrib>Bozza, Valerio</creatorcontrib><creatorcontrib>Albrow, Michael D.</creatorcontrib><creatorcontrib>Chung, Sun Ju</creatorcontrib><creatorcontrib>Hwang, Kyu Ha</creatorcontrib><creatorcontrib>Jung, Youn Kil</creatorcontrib><creatorcontrib>Ryu, Yoon-Hyun</creatorcontrib><creatorcontrib>Shin, In Gu</creatorcontrib><creatorcontrib>Shvartzvald, Yossi</creatorcontrib><creatorcontrib>Yee, Jennifer C.</creatorcontrib><creatorcontrib>Zang, Weicheng</creatorcontrib><creatorcontrib>Cha, Sang Mok</creatorcontrib><creatorcontrib>Kim, Dong-Jin</creatorcontrib><creatorcontrib>Kim, Hyoun Woo</creatorcontrib><creatorcontrib>Kim, Seung Lee</creatorcontrib><creatorcontrib>Lee, Dong-Joo</creatorcontrib><creatorcontrib>Lee, Yongseok</creatorcontrib><creatorcontrib>Park, Byeong Gon</creatorcontrib><creatorcontrib>Pogge, Richard W.</creatorcontrib><creatorcontrib>Jee, M. James</creatorcontrib><creatorcontrib>Kim, Doeon</creatorcontrib><creatorcontrib>Mroz, Przemek</creatorcontrib><creatorcontrib>Szymański, Michal K.</creatorcontrib><creatorcontrib>Skowron, Jan</creatorcontrib><creatorcontrib>Poleski, Radek</creatorcontrib><creatorcontrib>Soszynski, Igor</creatorcontrib><creatorcontrib>Pietrukowicz, Pawel</creatorcontrib><creatorcontrib>Kozłowski, Szymon</creatorcontrib><creatorcontrib>Ulaczyk, Krzysztof</creatorcontrib><creatorcontrib>Rybicki, Krzysztof A.</creatorcontrib><creatorcontrib>Iwanek, Patryk</creatorcontrib><creatorcontrib>Wrona, Marcin</creatorcontrib><creatorcontrib>Abe, Fumio</creatorcontrib><creatorcontrib>Richardson, Barry</creatorcontrib><creatorcontrib>Bennett, David P.</creatorcontrib><creatorcontrib>Bhattacharya, Aparna</creatorcontrib><creatorcontrib>Donachie, Martin</creatorcontrib><creatorcontrib>Fujii, Hirosane</creatorcontrib><creatorcontrib>Fukui, Akihiko</creatorcontrib><creatorcontrib>Itow, Yoshitaka</creatorcontrib><creatorcontrib>Hirao, Yuki</creatorcontrib><creatorcontrib>Kamei, Yuhei</creatorcontrib><creatorcontrib>Kondo, Iona</creatorcontrib><creatorcontrib>Koshimoto, Naoki</creatorcontrib><creatorcontrib>Li, Man Cheung Alex</creatorcontrib><creatorcontrib>Matsubara, Yutaka</creatorcontrib><creatorcontrib>Muraki, Yasushi</creatorcontrib><creatorcontrib>Miyazaki, Shota</creatorcontrib><creatorcontrib>Nagakane, Masayuki</creatorcontrib><creatorcontrib>Ranc, Clement</creatorcontrib><creatorcontrib>Rattenbury, Nicholas J.</creatorcontrib><creatorcontrib>Satoh, Yuki</creatorcontrib><creatorcontrib>Shoji, Hikaru</creatorcontrib><creatorcontrib>Suematsu, Haruno</creatorcontrib><creatorcontrib>Sullivan, Denis J.</creatorcontrib><creatorcontrib>Sumi, Takahiro</creatorcontrib><creatorcontrib>Suzuki, Daisuke</creatorcontrib><creatorcontrib>Tristram, Paul J.</creatorcontrib><creatorcontrib>Yamakawa, Takeharu</creatorcontrib><creatorcontrib>Yamawaki, Tsubasa</creatorcontrib><creatorcontrib>Yonehara, and Atsunori</creatorcontrib><creatorcontrib>The MOA Collaboration</creatorcontrib><creatorcontrib>The KMTNet Collaboration</creatorcontrib><creatorcontrib>The OGLE Collaboration</creatorcontrib><creatorcontrib>LEADING AUTHORS</creatorcontrib><title>Candidate Brown-dwarf Microlensing Events with Very Short Timescales and Small Angular Einstein Radii</title><title>The Astronomical journal</title><description>Short-timescale microlensing events are likely to be produced by substellar brown dwarfs (BDs), but it is difficult to securely identify BD lenses based on only event timescales because short-timescale events can also be produced by stellar lenses with high relative lens-source proper motions. In this paper, we report three strong candidate BD-lens events found from the search for lensing events not only with short timescales (t(E) ≲ 6 days) but also with very small angular Einstein radii (θ(E) ≲ 0.05 mas) among the events that have been found in the 2016–2019 observing seasons. These events include MOA-2017-BLG-147, MOA-2017-BLG-241, and MOA-2019-BLG-256, in which the first two events are produced by single lenses and the last event is produced by a binary lens. From the Monte Carlo simulations of Galactic events conducted with the combined t(E) and θ(E) constraint, it is estimated that the lens masses of the individual events are 0.051 (sup +0.100, sub -0.027) M(ʘ), 0.044 (sup +0.090, sub -0.023) M(ʘ), and 0.046 (sup +0.067, sub -0.023) M(ʘ)/0.038 (sup +0.056, sub -0.019) M(ʘ) and the probability of the lens mass smaller than the lower limit of stars is ~80% for all events. We point out that routine lens mass measurements of short-timescale lensing events require survey-mode space-based observations.</description><subject>Astronomy</subject><subject>Astrophysics</subject><subject>ASTROPHYSICS, COSMOLOGY AND ASTRONOMY</subject><subject>Binary stars</subject><subject>Brown dwarf stars</subject><subject>Computer simulation</subject><subject>COMPUTERIZED SIMULATION</subject><subject>DWARF STARS</subject><subject>GALAXIES</subject><subject>Lenses</subject><subject>MASS</subject><subject>Microlenses</subject><subject>MONTE CARLO METHOD</subject><subject>PROBABILITY</subject><subject>PROPER MOTION</subject><subject>SPACE</subject><subject>Time</subject><issn>0004-6256</issn><issn>1538-3881</issn><issn>1538-3881</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2020</creationdate><recordtype>article</recordtype><sourceid>CYI</sourceid><recordid>eNpNkE1LAzEQhoMoWKt3Dx4Cntcmm002e6ylfoAi2Oo1ZLOzbco2W5PU0n9vSkU8Dcw878vwIHRNyR2TRTminMmMSUlHuhatECdo8Lc6RQNCSJGJnItzdBHCihBKJSkGCCbaNbbREfC973cua3bat_jVGt934IJ1Czz9BhcD3tm4xJ_g93i27H3Ec7uGYHQHAacOPFvrrsNjt9h22uOpdSGCdfhdN9ZeorNWdwGufucQfTxM55On7OXt8XkyfskME3nMOG9KSstCF41OA7ikLQcmuUmHnEMJABWTuZYgeU1rChWpS0oES4w2gg3R7bG3D9GqYGwEszS9c2CiyhmhjBb_qI3vv7YQolr1W-_SY4kRVcVLUuaJIkcqmQjBQ6s23q613ytK1EG5OvhVB7_qqDxFbo4Rp4NWLvpUSHLCk-0qPfkDBy574g</recordid><startdate>20200401</startdate><enddate>20200401</enddate><creator>Han, Cheongho</creator><creator>Lee, Chung Uk</creator><creator>Udalski, Andrzej</creator><creator>Gould, Andrew</creator><creator>Bond, Ian A.</creator><creator>Bozza, Valerio</creator><creator>Albrow, Michael D.</creator><creator>Chung, Sun Ju</creator><creator>Hwang, Kyu Ha</creator><creator>Jung, Youn Kil</creator><creator>Ryu, Yoon-Hyun</creator><creator>Shin, In Gu</creator><creator>Shvartzvald, Yossi</creator><creator>Yee, Jennifer C.</creator><creator>Zang, Weicheng</creator><creator>Cha, Sang Mok</creator><creator>Kim, Dong-Jin</creator><creator>Kim, Hyoun Woo</creator><creator>Kim, Seung Lee</creator><creator>Lee, Dong-Joo</creator><creator>Lee, Yongseok</creator><creator>Park, Byeong Gon</creator><creator>Pogge, Richard W.</creator><creator>Jee, M. 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James ; Kim, Doeon ; Mroz, Przemek ; Szymański, Michal K. ; Skowron, Jan ; Poleski, Radek ; Soszynski, Igor ; Pietrukowicz, Pawel ; Kozłowski, Szymon ; Ulaczyk, Krzysztof ; Rybicki, Krzysztof A. ; Iwanek, Patryk ; Wrona, Marcin ; Abe, Fumio ; Richardson, Barry ; Bennett, David P. ; Bhattacharya, Aparna ; Donachie, Martin ; Fujii, Hirosane ; Fukui, Akihiko ; Itow, Yoshitaka ; Hirao, Yuki ; Kamei, Yuhei ; Kondo, Iona ; Koshimoto, Naoki ; Li, Man Cheung Alex ; Matsubara, Yutaka ; Muraki, Yasushi ; Miyazaki, Shota ; Nagakane, Masayuki ; Ranc, Clement ; Rattenbury, Nicholas J. ; Satoh, Yuki ; Shoji, Hikaru ; Suematsu, Haruno ; Sullivan, Denis J. ; Sumi, Takahiro ; Suzuki, Daisuke ; Tristram, Paul J. ; Yamakawa, Takeharu ; Yamawaki, Tsubasa ; Yonehara, and Atsunori</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c362t-55d71174a4da174e581f5e385c5d725e7eee9382a8e85b1b1e90b71063385ac63</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2020</creationdate><topic>Astronomy</topic><topic>Astrophysics</topic><topic>ASTROPHYSICS, COSMOLOGY AND ASTRONOMY</topic><topic>Binary stars</topic><topic>Brown dwarf stars</topic><topic>Computer simulation</topic><topic>COMPUTERIZED SIMULATION</topic><topic>DWARF STARS</topic><topic>GALAXIES</topic><topic>Lenses</topic><topic>MASS</topic><topic>Microlenses</topic><topic>MONTE CARLO METHOD</topic><topic>PROBABILITY</topic><topic>PROPER MOTION</topic><topic>SPACE</topic><topic>Time</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Han, Cheongho</creatorcontrib><creatorcontrib>Lee, Chung Uk</creatorcontrib><creatorcontrib>Udalski, Andrzej</creatorcontrib><creatorcontrib>Gould, Andrew</creatorcontrib><creatorcontrib>Bond, Ian A.</creatorcontrib><creatorcontrib>Bozza, Valerio</creatorcontrib><creatorcontrib>Albrow, Michael D.</creatorcontrib><creatorcontrib>Chung, Sun Ju</creatorcontrib><creatorcontrib>Hwang, Kyu Ha</creatorcontrib><creatorcontrib>Jung, Youn Kil</creatorcontrib><creatorcontrib>Ryu, Yoon-Hyun</creatorcontrib><creatorcontrib>Shin, In Gu</creatorcontrib><creatorcontrib>Shvartzvald, Yossi</creatorcontrib><creatorcontrib>Yee, Jennifer C.</creatorcontrib><creatorcontrib>Zang, Weicheng</creatorcontrib><creatorcontrib>Cha, Sang Mok</creatorcontrib><creatorcontrib>Kim, Dong-Jin</creatorcontrib><creatorcontrib>Kim, Hyoun Woo</creatorcontrib><creatorcontrib>Kim, Seung Lee</creatorcontrib><creatorcontrib>Lee, Dong-Joo</creatorcontrib><creatorcontrib>Lee, Yongseok</creatorcontrib><creatorcontrib>Park, Byeong Gon</creatorcontrib><creatorcontrib>Pogge, Richard W.</creatorcontrib><creatorcontrib>Jee, M. James</creatorcontrib><creatorcontrib>Kim, Doeon</creatorcontrib><creatorcontrib>Mroz, Przemek</creatorcontrib><creatorcontrib>Szymański, Michal K.</creatorcontrib><creatorcontrib>Skowron, Jan</creatorcontrib><creatorcontrib>Poleski, Radek</creatorcontrib><creatorcontrib>Soszynski, Igor</creatorcontrib><creatorcontrib>Pietrukowicz, Pawel</creatorcontrib><creatorcontrib>Kozłowski, Szymon</creatorcontrib><creatorcontrib>Ulaczyk, Krzysztof</creatorcontrib><creatorcontrib>Rybicki, Krzysztof A.</creatorcontrib><creatorcontrib>Iwanek, Patryk</creatorcontrib><creatorcontrib>Wrona, Marcin</creatorcontrib><creatorcontrib>Abe, Fumio</creatorcontrib><creatorcontrib>Richardson, Barry</creatorcontrib><creatorcontrib>Bennett, David P.</creatorcontrib><creatorcontrib>Bhattacharya, Aparna</creatorcontrib><creatorcontrib>Donachie, Martin</creatorcontrib><creatorcontrib>Fujii, Hirosane</creatorcontrib><creatorcontrib>Fukui, Akihiko</creatorcontrib><creatorcontrib>Itow, Yoshitaka</creatorcontrib><creatorcontrib>Hirao, Yuki</creatorcontrib><creatorcontrib>Kamei, Yuhei</creatorcontrib><creatorcontrib>Kondo, Iona</creatorcontrib><creatorcontrib>Koshimoto, Naoki</creatorcontrib><creatorcontrib>Li, Man Cheung Alex</creatorcontrib><creatorcontrib>Matsubara, Yutaka</creatorcontrib><creatorcontrib>Muraki, Yasushi</creatorcontrib><creatorcontrib>Miyazaki, Shota</creatorcontrib><creatorcontrib>Nagakane, Masayuki</creatorcontrib><creatorcontrib>Ranc, Clement</creatorcontrib><creatorcontrib>Rattenbury, Nicholas J.</creatorcontrib><creatorcontrib>Satoh, Yuki</creatorcontrib><creatorcontrib>Shoji, Hikaru</creatorcontrib><creatorcontrib>Suematsu, Haruno</creatorcontrib><creatorcontrib>Sullivan, Denis J.</creatorcontrib><creatorcontrib>Sumi, Takahiro</creatorcontrib><creatorcontrib>Suzuki, Daisuke</creatorcontrib><creatorcontrib>Tristram, Paul J.</creatorcontrib><creatorcontrib>Yamakawa, Takeharu</creatorcontrib><creatorcontrib>Yamawaki, Tsubasa</creatorcontrib><creatorcontrib>Yonehara, and Atsunori</creatorcontrib><creatorcontrib>The MOA Collaboration</creatorcontrib><creatorcontrib>The KMTNet Collaboration</creatorcontrib><creatorcontrib>The OGLE Collaboration</creatorcontrib><creatorcontrib>LEADING AUTHORS</creatorcontrib><collection>NASA Scientific and Technical Information</collection><collection>NASA Technical Reports Server</collection><collection>CrossRef</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Meteorological & Geoastrophysical Abstracts - Academic</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>OSTI.GOV</collection><jtitle>The Astronomical journal</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Han, Cheongho</au><au>Lee, Chung Uk</au><au>Udalski, Andrzej</au><au>Gould, Andrew</au><au>Bond, Ian A.</au><au>Bozza, Valerio</au><au>Albrow, Michael D.</au><au>Chung, Sun Ju</au><au>Hwang, Kyu Ha</au><au>Jung, Youn Kil</au><au>Ryu, Yoon-Hyun</au><au>Shin, In Gu</au><au>Shvartzvald, Yossi</au><au>Yee, Jennifer C.</au><au>Zang, Weicheng</au><au>Cha, Sang Mok</au><au>Kim, Dong-Jin</au><au>Kim, Hyoun Woo</au><au>Kim, Seung Lee</au><au>Lee, Dong-Joo</au><au>Lee, Yongseok</au><au>Park, Byeong Gon</au><au>Pogge, Richard W.</au><au>Jee, M. James</au><au>Kim, Doeon</au><au>Mroz, Przemek</au><au>Szymański, Michal K.</au><au>Skowron, Jan</au><au>Poleski, Radek</au><au>Soszynski, Igor</au><au>Pietrukowicz, Pawel</au><au>Kozłowski, Szymon</au><au>Ulaczyk, Krzysztof</au><au>Rybicki, Krzysztof A.</au><au>Iwanek, Patryk</au><au>Wrona, Marcin</au><au>Abe, Fumio</au><au>Richardson, Barry</au><au>Bennett, David P.</au><au>Bhattacharya, Aparna</au><au>Donachie, Martin</au><au>Fujii, Hirosane</au><au>Fukui, Akihiko</au><au>Itow, Yoshitaka</au><au>Hirao, Yuki</au><au>Kamei, Yuhei</au><au>Kondo, Iona</au><au>Koshimoto, Naoki</au><au>Li, Man Cheung Alex</au><au>Matsubara, Yutaka</au><au>Muraki, Yasushi</au><au>Miyazaki, Shota</au><au>Nagakane, Masayuki</au><au>Ranc, Clement</au><au>Rattenbury, Nicholas J.</au><au>Satoh, Yuki</au><au>Shoji, Hikaru</au><au>Suematsu, Haruno</au><au>Sullivan, Denis J.</au><au>Sumi, Takahiro</au><au>Suzuki, Daisuke</au><au>Tristram, Paul J.</au><au>Yamakawa, Takeharu</au><au>Yamawaki, Tsubasa</au><au>Yonehara, and Atsunori</au><aucorp>The MOA Collaboration</aucorp><aucorp>The KMTNet Collaboration</aucorp><aucorp>The OGLE Collaboration</aucorp><aucorp>LEADING AUTHORS</aucorp><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Candidate Brown-dwarf Microlensing Events with Very Short Timescales and Small Angular Einstein Radii</atitle><jtitle>The Astronomical journal</jtitle><date>2020-04-01</date><risdate>2020</risdate><volume>159</volume><issue>4</issue><spage>134</spage><pages>134-</pages><issn>0004-6256</issn><issn>1538-3881</issn><eissn>1538-3881</eissn><abstract>Short-timescale microlensing events are likely to be produced by substellar brown dwarfs (BDs), but it is difficult to securely identify BD lenses based on only event timescales because short-timescale events can also be produced by stellar lenses with high relative lens-source proper motions. In this paper, we report three strong candidate BD-lens events found from the search for lensing events not only with short timescales (t(E) ≲ 6 days) but also with very small angular Einstein radii (θ(E) ≲ 0.05 mas) among the events that have been found in the 2016–2019 observing seasons. These events include MOA-2017-BLG-147, MOA-2017-BLG-241, and MOA-2019-BLG-256, in which the first two events are produced by single lenses and the last event is produced by a binary lens. From the Monte Carlo simulations of Galactic events conducted with the combined t(E) and θ(E) constraint, it is estimated that the lens masses of the individual events are 0.051 (sup +0.100, sub -0.027) M(ʘ), 0.044 (sup +0.090, sub -0.023) M(ʘ), and 0.046 (sup +0.067, sub -0.023) M(ʘ)/0.038 (sup +0.056, sub -0.019) M(ʘ) and the probability of the lens mass smaller than the lower limit of stars is ~80% for all events. We point out that routine lens mass measurements of short-timescale lensing events require survey-mode space-based observations.</abstract><cop>Goddard Space Flight Center</cop><pub>The American Astronomical Society</pub><doi>10.3847/1538-3881/ab6f66</doi><orcidid>https://orcid.org/0000-0002-2641-9964</orcidid><orcidid>https://orcid.org/0000-0002-2335-1730</orcidid><orcidid>https://orcid.org/0000-0003-4590-0136</orcidid><orcidid>https://orcid.org/0000-0002-5843-9433</orcidid><orcidid>https://orcid.org/0000-0001-6000-3463</orcidid><orcidid>https://orcid.org/0000-0002-6212-7221</orcidid><orcidid>https://orcid.org/0000-0001-5069-319X</orcidid><orcidid>https://orcid.org/0000-0001-9818-1513</orcidid><orcidid>https://orcid.org/0000-0003-2388-4534</orcidid><orcidid>https://orcid.org/0000-0001-8043-8413</orcidid><orcidid>https://orcid.org/0000-0003-2302-9562</orcidid><orcidid>https://orcid.org/0000-0001-9481-7123</orcidid><orcidid>https://orcid.org/0000-0003-1435-3053</orcidid><orcidid>https://orcid.org/0000-0001-6364-408X</orcidid><orcidid>https://orcid.org/0000-0002-8198-1968</orcidid><orcidid>https://orcid.org/0000-0001-9823-2907</orcidid><orcidid>https://orcid.org/0000-0002-4909-5763</orcidid><orcidid>https://orcid.org/0000-0001-6285-4528</orcidid><orcidid>https://orcid.org/0000-0003-1525-5041</orcidid><orcidid>https://orcid.org/0000-0002-3401-1029</orcidid><orcidid>https://orcid.org/0000-0002-9241-4117</orcidid><orcidid>https://orcid.org/0000-0002-2339-5899</orcidid><orcidid>https://orcid.org/0000-0002-4355-9838</orcidid><oa>free_for_read</oa></addata></record> |
| fulltext | fulltext |
| identifier | ISSN: 0004-6256 |
| ispartof | The Astronomical journal, 2020-04, Vol.159 (4), p.134 |
| issn | 0004-6256 1538-3881 1538-3881 |
| language | eng |
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| source | IOP Publishing Free Content; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; NASA Technical Reports Server; IOPscience extra; Alma/SFX Local Collection |
| subjects | Astronomy Astrophysics ASTROPHYSICS, COSMOLOGY AND ASTRONOMY Binary stars Brown dwarf stars Computer simulation COMPUTERIZED SIMULATION DWARF STARS GALAXIES Lenses MASS Microlenses MONTE CARLO METHOD PROBABILITY PROPER MOTION SPACE Time |
| title | Candidate Brown-dwarf Microlensing Events with Very Short Timescales and Small Angular Einstein Radii |
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