Moa-2010-BLG-073L: An m-dwarf with a substellar companion at the planet/brown dwarf boundary

We present an analysis of the anomalous microlensing event,MOA-2010-BLG-073, announced by the Microlensing Observations in Astrophysics survey on 2010 March 18. This event was remarkable because the source was previously known to be photometrically variable. Analyzing the pre-event source light curv...

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Main Authors:	Street, R., Choi, J., Tsapras, Y., Han, C., Furusawa, K., Hundertmark, M., Gould, A., Sumi, T., Bond, I., Wouters, D., Zellem, R., Udalski, A., Snodgrass, C., Horne, K., Dominik, M., Browne, P., Kains, N., Bramich, D., Bajek, D., Steele, I., Ipatov, S., Abe, F., Bennett, D., Botzler, C., Chote, P., Freeman, M., Fukui, A., Harris, P., Itow, Y., Ling, C., Masuda, K., Matsubara, Y., Miyake, N., Muraki, Y., Nagayama, T., Nishimaya, S., Ohnishi, K., Rattenbury, N., Saito, T., Sullivan, D., Suzuki, D., Sweatman, W., Tristram, P., Wada, K., Yock, P., Szymanski, M., Kubiak, M., Pietrzynski, G., Soszynski, I., Poleski, R., Ulaczyk, K., Wyrzykowski, L., Yee, J., Dong, S., Shin, I., Lee, C., Skowron, J., Andrade de Almeida, L., DePoy, D., Gaudi, B., Hung, L., Jablonski, F., Kaspi, S., Klein, N., Hwang, K., Koo, J., Maoz, D., Munoz, J., Pogge, R., Polishhook, D., Shporer, A., McCormick, J., Christie, G., Natusch, T., Allen, B., Drummond, J., Moorhouse, D., Thornley, G., Knowler, M., Bos, M., Bolt, G., Beaulieu, J., Albrow, M., Batista, V., Brillant, S., Caldwell, J., Cassan, A., Cole, A., Corrales, E., Coutures, C., Dieters, S., Dominis Prester, D., Donatowicz, J., Fouque, P., Bachelet, E., Greenhill, J., Kane, S., Kubas, D., Marquette, J., Martin, R., Menzies, J., Pollard, K., Sahu, K., Wambsganss, J., Williams, Andrew, Zub, M., Alsubai, K., Bozza, V., Burgdorf, M., Calchi Novati, S., Dodds, P., Dreizler, S., Finet, F., Gerner, T., Hardis, S., Harpsoe, K., Hessman, F., Hinse, T., Jorgensen, U., Kerins, E., Liebig, C., Mancini, L., Mathiasen, M., Penny, M., Proft, S., Rahvar, S., Ricci, D., Scarpetta, G., Schafer, S., Schonebeck, F., Southworth, J., Surdej, J.
Format:	Journal Article
Published:	Institute of Physics Publishing, Inc. 2013
Subjects:	brown dwarfs planets and satellites general – techniques photometric planetary systems planets and satellites: - formation gravitational lensing: micro
Online Access:	http://iopscience.iop.org/0004-637X/763/1/67/pdf/0004-637X_763_1_67.pdf http://hdl.handle.net/20.500.11937/17361

_version_	1848749446268977152
author	Street, R. Choi, J. Tsapras, Y. Han, C. Furusawa, K. Hundertmark, M. Gould, A. Sumi, T. Bond, I. Wouters, D. Zellem, R. Udalski, A. Snodgrass, C. Horne, K. Dominik, M. Browne, P. Kains, N. Bramich, D. Bajek, D. Steele, I. Ipatov, S. Abe, F. Bennett, D. Botzler, C. Chote, P. Freeman, M. Fukui, A. Harris, P. Itow, Y. Ling, C. Masuda, K. Matsubara, Y. Miyake, N. Muraki, Y. Nagayama, T. Nishimaya, S. Ohnishi, K. Rattenbury, N. Saito, T. Sullivan, D. Suzuki, D. Sweatman, W. Tristram, P. Wada, K. Yock, P. Szymanski, M. Kubiak, M. Pietrzynski, G. Soszynski, I. Poleski, R. Ulaczyk, K. Wyrzykowski, L. Yee, J. Dong, S. Shin, I. Lee, C. Skowron, J. Andrade de Almeida, L. DePoy, D. Gaudi, B. Hung, L. Jablonski, F. Kaspi, S. Klein, N. Hwang, K. Koo, J. Maoz, D. Munoz, J. Pogge, R. Polishhook, D. Shporer, A. McCormick, J. Christie, G. Natusch, T. Allen, B. Drummond, J. Moorhouse, D. Thornley, G. Knowler, M. Bos, M. Bolt, G. Beaulieu, J. Albrow, M. Batista, V. Brillant, S. Caldwell, J. Cassan, A. Cole, A. Corrales, E. Coutures, C. Dieters, S. Dominis Prester, D. Donatowicz, J. Fouque, P. Bachelet, E. Greenhill, J. Kane, S. Kubas, D. Marquette, J. Martin, R. Menzies, J. Pollard, K. Sahu, K. Wambsganss, J. Williams, Andrew Zub, M. Alsubai, K. Bozza, V. Burgdorf, M. Calchi Novati, S. Dodds, P. Dreizler, S. Finet, F. Gerner, T. Hardis, S. Harpsoe, K. Hessman, F. Hinse, T. Jorgensen, U. Kerins, E. Liebig, C. Mancini, L. Mathiasen, M. Penny, M. Proft, S. Rahvar, S. Ricci, D. Scarpetta, G. Schafer, S. Schonebeck, F. Southworth, J. Surdej, J.
author_facet	Street, R. Choi, J. Tsapras, Y. Han, C. Furusawa, K. Hundertmark, M. Gould, A. Sumi, T. Bond, I. Wouters, D. Zellem, R. Udalski, A. Snodgrass, C. Horne, K. Dominik, M. Browne, P. Kains, N. Bramich, D. Bajek, D. Steele, I. Ipatov, S. Abe, F. Bennett, D. Botzler, C. Chote, P. Freeman, M. Fukui, A. Harris, P. Itow, Y. Ling, C. Masuda, K. Matsubara, Y. Miyake, N. Muraki, Y. Nagayama, T. Nishimaya, S. Ohnishi, K. Rattenbury, N. Saito, T. Sullivan, D. Suzuki, D. Sweatman, W. Tristram, P. Wada, K. Yock, P. Szymanski, M. Kubiak, M. Pietrzynski, G. Soszynski, I. Poleski, R. Ulaczyk, K. Wyrzykowski, L. Yee, J. Dong, S. Shin, I. Lee, C. Skowron, J. Andrade de Almeida, L. DePoy, D. Gaudi, B. Hung, L. Jablonski, F. Kaspi, S. Klein, N. Hwang, K. Koo, J. Maoz, D. Munoz, J. Pogge, R. Polishhook, D. Shporer, A. McCormick, J. Christie, G. Natusch, T. Allen, B. Drummond, J. Moorhouse, D. Thornley, G. Knowler, M. Bos, M. Bolt, G. Beaulieu, J. Albrow, M. Batista, V. Brillant, S. Caldwell, J. Cassan, A. Cole, A. Corrales, E. Coutures, C. Dieters, S. Dominis Prester, D. Donatowicz, J. Fouque, P. Bachelet, E. Greenhill, J. Kane, S. Kubas, D. Marquette, J. Martin, R. Menzies, J. Pollard, K. Sahu, K. Wambsganss, J. Williams, Andrew Zub, M. Alsubai, K. Bozza, V. Burgdorf, M. Calchi Novati, S. Dodds, P. Dreizler, S. Finet, F. Gerner, T. Hardis, S. Harpsoe, K. Hessman, F. Hinse, T. Jorgensen, U. Kerins, E. Liebig, C. Mancini, L. Mathiasen, M. Penny, M. Proft, S. Rahvar, S. Ricci, D. Scarpetta, G. Schafer, S. Schonebeck, F. Southworth, J. Surdej, J.
author_sort	Street, R.
building	Curtin Institutional Repository
collection	Online Access
description	We present an analysis of the anomalous microlensing event,MOA-2010-BLG-073, announced by the Microlensing Observations in Astrophysics survey on 2010 March 18. This event was remarkable because the source was previously known to be photometrically variable. Analyzing the pre-event source light curve, we demonstrate that it is an irregular variable over timescales >200 days. Its dereddened color, (V - I )S,0, is 1.221 ± 0.051 mag, and from our lens model we derive a source radius of 14.7 ± 1.3 R, suggesting that it is a red giant star. We initially explored a number of purely microlensing models for the event but found a residual gradient in the data taken prior to and after the event. This is likely to be due to the variability of the source rather than part of the lensing event, so we incorporated a slope parameter in our model in order to derive the true parameters of the lensing system. Wefind that the lensing system has a mass ratio of q = 0.0654 ± 0.0006. The Einstein crossing time of the event, tE = 44.3±0.1 days, was sufficiently long that the light curve exhibited parallax effects. In addition, the source trajectory relative to the large caustic structure allowed the orbital motion of the lens system to be detected. Combining the parallax with the Einstein radius, we were able to derive the distance to the lens, DL = 2.8 ± 0.4 kpc, and the massesof the lensing objects. The primary of the lens is an M-dwarf with ML,1 = 0.16 ± 0.03 M, while the companion has ML,2 = 11.0 ± 2.0 MJ, putting it in the boundary zone between planets and brown dwarfs.
first_indexed	2025-11-14T07:21:04Z
format	Journal Article
id	curtin-20.500.11937-17361
institution	Curtin University Malaysia
institution_category	Local University
last_indexed	2025-11-14T07:21:04Z
publishDate	2013
publisher	Institute of Physics Publishing, Inc.
recordtype	eprints
repository_type	Digital Repository
spelling	curtin-20.500.11937-173612017-05-30T08:10:09Z Moa-2010-BLG-073L: An m-dwarf with a substellar companion at the planet/brown dwarf boundary Street, R. Choi, J. Tsapras, Y. Han, C. Furusawa, K. Hundertmark, M. Gould, A. Sumi, T. Bond, I. Wouters, D. Zellem, R. Udalski, A. Snodgrass, C. Horne, K. Dominik, M. Browne, P. Kains, N. Bramich, D. Bajek, D. Steele, I. Ipatov, S. Abe, F. Bennett, D. Botzler, C. Chote, P. Freeman, M. Fukui, A. Harris, P. Itow, Y. Ling, C. Masuda, K. Matsubara, Y. Miyake, N. Muraki, Y. Nagayama, T. Nishimaya, S. Ohnishi, K. Rattenbury, N. Saito, T. Sullivan, D. Suzuki, D. Sweatman, W. Tristram, P. Wada, K. Yock, P. Szymanski, M. Kubiak, M. Pietrzynski, G. Soszynski, I. Poleski, R. Ulaczyk, K. Wyrzykowski, L. Yee, J. Dong, S. Shin, I. Lee, C. Skowron, J. Andrade de Almeida, L. DePoy, D. Gaudi, B. Hung, L. Jablonski, F. Kaspi, S. Klein, N. Hwang, K. Koo, J. Maoz, D. Munoz, J. Pogge, R. Polishhook, D. Shporer, A. McCormick, J. Christie, G. Natusch, T. Allen, B. Drummond, J. Moorhouse, D. Thornley, G. Knowler, M. Bos, M. Bolt, G. Beaulieu, J. Albrow, M. Batista, V. Brillant, S. Caldwell, J. Cassan, A. Cole, A. Corrales, E. Coutures, C. Dieters, S. Dominis Prester, D. Donatowicz, J. Fouque, P. Bachelet, E. Greenhill, J. Kane, S. Kubas, D. Marquette, J. Martin, R. Menzies, J. Pollard, K. Sahu, K. Wambsganss, J. Williams, Andrew Zub, M. Alsubai, K. Bozza, V. Burgdorf, M. Calchi Novati, S. Dodds, P. Dreizler, S. Finet, F. Gerner, T. Hardis, S. Harpsoe, K. Hessman, F. Hinse, T. Jorgensen, U. Kerins, E. Liebig, C. Mancini, L. Mathiasen, M. Penny, M. Proft, S. Rahvar, S. Ricci, D. Scarpetta, G. Schafer, S. Schonebeck, F. Southworth, J. Surdej, J. brown dwarfs planets and satellites general – techniques photometric planetary systems planets and satellites: - formation gravitational lensing: micro We present an analysis of the anomalous microlensing event,MOA-2010-BLG-073, announced by the Microlensing Observations in Astrophysics survey on 2010 March 18. This event was remarkable because the source was previously known to be photometrically variable. Analyzing the pre-event source light curve, we demonstrate that it is an irregular variable over timescales >200 days. Its dereddened color, (V - I )S,0, is 1.221 ± 0.051 mag, and from our lens model we derive a source radius of 14.7 ± 1.3 R, suggesting that it is a red giant star. We initially explored a number of purely microlensing models for the event but found a residual gradient in the data taken prior to and after the event. This is likely to be due to the variability of the source rather than part of the lensing event, so we incorporated a slope parameter in our model in order to derive the true parameters of the lensing system. Wefind that the lensing system has a mass ratio of q = 0.0654 ± 0.0006. The Einstein crossing time of the event, tE = 44.3±0.1 days, was sufficiently long that the light curve exhibited parallax effects. In addition, the source trajectory relative to the large caustic structure allowed the orbital motion of the lens system to be detected. Combining the parallax with the Einstein radius, we were able to derive the distance to the lens, DL = 2.8 ± 0.4 kpc, and the massesof the lensing objects. The primary of the lens is an M-dwarf with ML,1 = 0.16 ± 0.03 M, while the companion has ML,2 = 11.0 ± 2.0 MJ, putting it in the boundary zone between planets and brown dwarfs. 2013 Journal Article http://hdl.handle.net/20.500.11937/17361 http://iopscience.iop.org/0004-637X/763/1/67/pdf/0004-637X_763_1_67.pdf Institute of Physics Publishing, Inc. restricted
spellingShingle	brown dwarfs planets and satellites general – techniques photometric planetary systems planets and satellites: - formation gravitational lensing: micro Street, R. Choi, J. Tsapras, Y. Han, C. Furusawa, K. Hundertmark, M. Gould, A. Sumi, T. Bond, I. Wouters, D. Zellem, R. Udalski, A. Snodgrass, C. Horne, K. Dominik, M. Browne, P. Kains, N. Bramich, D. Bajek, D. Steele, I. Ipatov, S. Abe, F. Bennett, D. Botzler, C. Chote, P. Freeman, M. Fukui, A. Harris, P. Itow, Y. Ling, C. Masuda, K. Matsubara, Y. Miyake, N. Muraki, Y. Nagayama, T. Nishimaya, S. Ohnishi, K. Rattenbury, N. Saito, T. Sullivan, D. Suzuki, D. Sweatman, W. Tristram, P. Wada, K. Yock, P. Szymanski, M. Kubiak, M. Pietrzynski, G. Soszynski, I. Poleski, R. Ulaczyk, K. Wyrzykowski, L. Yee, J. Dong, S. Shin, I. Lee, C. Skowron, J. Andrade de Almeida, L. DePoy, D. Gaudi, B. Hung, L. Jablonski, F. Kaspi, S. Klein, N. Hwang, K. Koo, J. Maoz, D. Munoz, J. Pogge, R. Polishhook, D. Shporer, A. McCormick, J. Christie, G. Natusch, T. Allen, B. Drummond, J. Moorhouse, D. Thornley, G. Knowler, M. Bos, M. Bolt, G. Beaulieu, J. Albrow, M. Batista, V. Brillant, S. Caldwell, J. Cassan, A. Cole, A. Corrales, E. Coutures, C. Dieters, S. Dominis Prester, D. Donatowicz, J. Fouque, P. Bachelet, E. Greenhill, J. Kane, S. Kubas, D. Marquette, J. Martin, R. Menzies, J. Pollard, K. Sahu, K. Wambsganss, J. Williams, Andrew Zub, M. Alsubai, K. Bozza, V. Burgdorf, M. Calchi Novati, S. Dodds, P. Dreizler, S. Finet, F. Gerner, T. Hardis, S. Harpsoe, K. Hessman, F. Hinse, T. Jorgensen, U. Kerins, E. Liebig, C. Mancini, L. Mathiasen, M. Penny, M. Proft, S. Rahvar, S. Ricci, D. Scarpetta, G. Schafer, S. Schonebeck, F. Southworth, J. Surdej, J. Moa-2010-BLG-073L: An m-dwarf with a substellar companion at the planet/brown dwarf boundary
title	Moa-2010-BLG-073L: An m-dwarf with a substellar companion at the planet/brown dwarf boundary
title_full	Moa-2010-BLG-073L: An m-dwarf with a substellar companion at the planet/brown dwarf boundary
title_fullStr	Moa-2010-BLG-073L: An m-dwarf with a substellar companion at the planet/brown dwarf boundary
title_full_unstemmed	Moa-2010-BLG-073L: An m-dwarf with a substellar companion at the planet/brown dwarf boundary
title_short	Moa-2010-BLG-073L: An m-dwarf with a substellar companion at the planet/brown dwarf boundary
title_sort	moa-2010-blg-073l: an m-dwarf with a substellar companion at the planet/brown dwarf boundary
topic	brown dwarfs planets and satellites general – techniques photometric planetary systems planets and satellites: - formation gravitational lensing: micro
url	http://iopscience.iop.org/0004-637X/763/1/67/pdf/0004-637X_763_1_67.pdf http://hdl.handle.net/20.500.11937/17361

Moa-2010-BLG-073L: An m-dwarf with a substellar companion at the planet/brown dwarf boundary

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