MICROLENSING DISCOVERY OF A TIGHT, LOW-MASS-RATIO PLANETARY-MASS OBJECT AROUND AN OLD FIELD BROWN DWARF

MICROLENSING DISCOVERY OF A TIGHT, LOW-MASS-RATIO PLANETARY-MASS OBJECT AROUND AN OLD FIELD BROWN DWARF
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DOI：
10.1088/0004-637x/778/1/38
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发表时间：
2013-07
期刊：
The Astrophysical Journal
影响因子：
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通讯作者：
C. Han;Y. Jung;A. Udalski;T. Sumi;B. Gaudi;A. Gould;D. Bennett;Y. Tsapras;M. Szyma'nski;M. Kubiak;G. Pietrzy'nski;I. Soszy'nski;J. Skowron;S. Kozłowski;R. Poleski;K. Ulaczyk;Ł. Wyrzykowski;P. Pietrukowicz;F. Abe;I. Bond;C. Botzler;P. Chote;M. Freeman;A. Fukui;K. Furusawa;P. Harris;Y. Itow;C. Ling;K. Masuda;Y. Matsubara;Y. Muraki;K. Ohnishi;N. Rattenbury;T. Saito;D. Sullivan;W. Sweatman;D. Suzuki;P. Tristram;K. Wada;P. Yock;V. Batista;G. Christie;J.-Y. Choi;D. Depoy;S. Dong;K. Hwang;A. Kavka;C.‐U. Lee;L. Monard;T. Natusch;H. Ngan;H. Park;R. Pogge;I. Porritt;I. Shin;T. Tan;J. Yee;K. Alsubai;V. Bozza;D. Bramich;P. Browne;M. Dominik;K. Horne;M. Hundertmark;S. Ipatov;N. Kains;C. Liebig;C. Snodgrass;I. Steele;R. Street
C. Han;Y. Jung;A. Udalski;T. Sumi;B. Gaudi;A. Gould;D. Bennett;Y. Tsapras;M. Szyma'nski;M. Kubiak;G. Pietrzy'nski;I. Soszy'nski;J. Skowron;S. Kozłowski;R. Poleski;K. Ulaczyk;Ł. Wyrzykowski;P. Pietrukowicz;F. Abe;I. Bond;C. Botzler;P. Chote;M. Freeman;A. Fukui;K. Furusawa;P. Harris;Y. Itow;C. Ling;K. Masuda;Y. Matsubara;Y. Muraki;K. Ohnishi;N. Rattenbury;T. Saito;D. Sullivan;W. Sweatman;D. Suzuki;P. Tristram;K. Wada;P. Yock;V. Batista;G. Christie;J.-Y. Choi;D. Depoy;S. Dong;K. Hwang;A. Kavka;C.‐U. Lee;L. Monard;T. Natusch;H. Ngan;H. Park;R. Pogge;I. Porritt;I. Shin;T. Tan;J. Yee;K. Alsubai;V. Bozza;D. Bramich;P. Browne;M. Dominik;K. Horne;M. Hundertmark;S. Ipatov;N. Kains;C. Liebig;C. Snodgrass;I. Steele;R. Street
中科院分区：
其他
文献类型：
--
作者：
C. Han;Y. Jung;A. Udalski;T. Sumi;B. Gaudi;A. Gould;D. Bennett;Y. Tsapras;M. Szyma'nski;M. Kubiak;G. Pietrzy'nski;I. Soszy'nski;J. Skowron;S. Kozłowski;R. Poleski;K. Ulaczyk;Ł. Wyrzykowski;P. Pietrukowicz;F. Abe;I. Bond;C. Botzler;P. Chote;M. Freeman;A. Fukui;K. Furusawa;P. Harris;Y. Itow;C. Ling;K. Masuda;Y. Matsubara;Y. Muraki;K. Ohnishi;N. Rattenbury;T. Saito;D. Sullivan;W. Sweatman;D. Suzuki;P. Tristram;K. Wada;P. Yock;V. Batista;G. Christie;J.-Y. Choi;D. Depoy;S. Dong;K. Hwang;A. Kavka;C.‐U. Lee;L. Monard;T. Natusch;H. Ngan;H. Park;R. Pogge;I. Porritt;I. Shin;T. Tan;J. Yee;K. Alsubai;V. Bozza;D. Bramich;P. Browne;M. Dominik;K. Horne;M. Hundertmark;S. Ipatov;N. Kains;C. Liebig;C. Snodgrass;I. Steele;R. Street

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对年轻褐矮星（BDs）周围吸积盘的观察导致了它们可能形成类似于正常恒星的行星系统的猜测。虽然在BDs周围已经发现了几颗行星质量的天体（2MASS 1207-3932和2MASS 0441-2301），但这些伴星具有相对较大的质量比和投影距离，表明它们以类似于恒星双星的方式形成。我们通过引力微透镜发现了一个行星质量的天体，OGLE-2012-BLG-0358Lb。该系统是一个较低的次级/主质量比（0.080±0.001），相对紧密分离（~ 0.87 AU）的双星系统，由一个质量为1.9±0.2木星质量的行星质量天体绕着一个质量为0.022 M☉的双星运行。相对较小的质量比和分离表明伴星可能是以类似行星的方式在BD宿主周围的原行星盘中形成的。
Observations of accretion disks around young brown dwarfs (BDs) have led to the speculation that they may form planetary systems similar to normal stars. While there have been several detections of planetary-mass objects around BDs (2MASS 1207-3932 and 2MASS 0441-2301), these companions have relatively large mass ratios and projected separations, suggesting that they formed in a manner analogous to stellar binaries. We present the discovery of a planetary-mass object orbiting a field BD via gravitational microlensing, OGLE-2012-BLG-0358Lb. The system is a low secondary/primary mass ratio (0.080 ± 0.001), relatively tightly separated (∼0.87 AU) binary composed of a planetary-mass object with 1.9 ± 0.2 Jupiter masses orbiting a BD with a mass 0.022 M☉. The relatively small mass ratio and separation suggest that the companion may have formed in a protoplanetary disk around the BD host in a manner analogous to planets.