PLANETARY AND OTHER SHORT BINARY MICROLENSING EVENTS FROM THE MOA SHORT-EVENT ANALYSIS
Abstract
We present the analysis of four candidate short-duration binary microlensing events from the 2006-2007 MOA Project short-event analysis. These events were discovered as a by-product of an analysis designed to find short-timescale single-lens events that may be due to free-floating planets. Three of these events are determined to be microlensing events, while the fourth is most likely caused by stellar variability. For each of the three microlensing events, the signal is almost entirely due to a brief caustic feature with little or no lensing attributable mainly to the lens primary. One of these events, MOA-bin-1, is due to a planet, and it is the first example of a planetary event in which the stellar host is only detected through binary microlensing effects. The mass ratio and separation are q (4.9 {+-} 1.4) Multiplication-Sign 10{sup -3} and s = 2.10 {+-} 0.05, respectively. A Bayesian analysis based on a standard Galactic model indicates that the planet, MOA-bin-1Lb, has a mass of m{sub p} = 3.7 {+-} 2.1 M{sub Jup} and orbits a star of M{sub *} = 0.75{sub -0.41}{sup +}0{sup .33} M{sub Sun} at a semimajor axis of a = 8.3{sub -2.7}{sup +4.5} AU. This is one of the most massivemore »
- Authors:
-
- Department of Physics, University of Notre Dame, Notre Dame, IN 46556 (United States)
- Department of Earth and Space Science, Osaka University, Osaka 560-0043 (Japan)
- Institute for Information and Mathematical Sciences, Massey University, Auckland 1330 (New Zealand)
- Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya 464-8601 (Japan)
- Department of Physics, University of Auckland, Private Bag 92-019, Auckland 1001 (New Zealand)
- School of Chemical and Physical Sciences, Victoria University, Wellington (New Zealand)
- Mt. John Observatory, P.O. Box 56, Lake Tekapo 8770 (New Zealand)
- Nagano National College of Technology, Nagano 381-8550 (Japan)
- Publication Date:
- OSTI Identifier:
- 22092218
- Resource Type:
- Journal Article
- Journal Name:
- Astrophysical Journal
- Additional Journal Information:
- Journal Volume: 757; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ASTRONOMY; ASTROPHYSICS; DETECTION; EFFICIENCY; GRAVITATIONAL LENSES; MASS; MILKY WAY; ORBITS; PLANETS; SATELLITES; STARS
Citation Formats
Bennett, D. P., Sumi, T., Bond, I. A., Ling, C. H., Kamiya, K., Abe, F., Fukui, A., Furusawa, K., Itow, Y., Masuda, K., Matsubara, Y., Miyake, N., Muraki, Y., Botzler, C. S., Rattenbury, N. J., Korpela, A. V., Sullivan, D. J., Kilmartin, P. M., Ohnishi, K., Saito, To., E-mail: bennett@nd.edu, Collaboration: MOA Collaboration, and others, and. PLANETARY AND OTHER SHORT BINARY MICROLENSING EVENTS FROM THE MOA SHORT-EVENT ANALYSIS. United States: N. p., 2012.
Web. doi:10.1088/0004-637X/757/2/119.
Bennett, D. P., Sumi, T., Bond, I. A., Ling, C. H., Kamiya, K., Abe, F., Fukui, A., Furusawa, K., Itow, Y., Masuda, K., Matsubara, Y., Miyake, N., Muraki, Y., Botzler, C. S., Rattenbury, N. J., Korpela, A. V., Sullivan, D. J., Kilmartin, P. M., Ohnishi, K., Saito, To., E-mail: bennett@nd.edu, Collaboration: MOA Collaboration, & others, and. PLANETARY AND OTHER SHORT BINARY MICROLENSING EVENTS FROM THE MOA SHORT-EVENT ANALYSIS. United States. https://doi.org/10.1088/0004-637X/757/2/119
Bennett, D. P., Sumi, T., Bond, I. A., Ling, C. H., Kamiya, K., Abe, F., Fukui, A., Furusawa, K., Itow, Y., Masuda, K., Matsubara, Y., Miyake, N., Muraki, Y., Botzler, C. S., Rattenbury, N. J., Korpela, A. V., Sullivan, D. J., Kilmartin, P. M., Ohnishi, K., Saito, To., E-mail: bennett@nd.edu, Collaboration: MOA Collaboration, and others, and. 2012.
"PLANETARY AND OTHER SHORT BINARY MICROLENSING EVENTS FROM THE MOA SHORT-EVENT ANALYSIS". United States. https://doi.org/10.1088/0004-637X/757/2/119.
@article{osti_22092218,
title = {PLANETARY AND OTHER SHORT BINARY MICROLENSING EVENTS FROM THE MOA SHORT-EVENT ANALYSIS},
author = {Bennett, D. P. and Sumi, T. and Bond, I. A. and Ling, C. H. and Kamiya, K. and Abe, F. and Fukui, A. and Furusawa, K. and Itow, Y. and Masuda, K. and Matsubara, Y. and Miyake, N. and Muraki, Y. and Botzler, C. S. and Rattenbury, N. J. and Korpela, A. V. and Sullivan, D. J. and Kilmartin, P. M. and Ohnishi, K. and Saito, To., E-mail: bennett@nd.edu and Collaboration: MOA Collaboration and others, and},
abstractNote = {We present the analysis of four candidate short-duration binary microlensing events from the 2006-2007 MOA Project short-event analysis. These events were discovered as a by-product of an analysis designed to find short-timescale single-lens events that may be due to free-floating planets. Three of these events are determined to be microlensing events, while the fourth is most likely caused by stellar variability. For each of the three microlensing events, the signal is almost entirely due to a brief caustic feature with little or no lensing attributable mainly to the lens primary. One of these events, MOA-bin-1, is due to a planet, and it is the first example of a planetary event in which the stellar host is only detected through binary microlensing effects. The mass ratio and separation are q (4.9 {+-} 1.4) Multiplication-Sign 10{sup -3} and s = 2.10 {+-} 0.05, respectively. A Bayesian analysis based on a standard Galactic model indicates that the planet, MOA-bin-1Lb, has a mass of m{sub p} = 3.7 {+-} 2.1 M{sub Jup} and orbits a star of M{sub *} = 0.75{sub -0.41}{sup +}0{sup .33} M{sub Sun} at a semimajor axis of a = 8.3{sub -2.7}{sup +4.5} AU. This is one of the most massive and widest separation planets found by microlensing. The scarcity of such wide-separation planets also has implications for interpretation of the isolated planetary mass objects found by this analysis. If we assume that we have been able to detect wide-separation planets with an efficiency at least as high as that for isolated planets, then we can set limits on the distribution of planets in wide orbits. In particular, if the entire isolated planet sample found by Sumi et al. consists of planets bound in wide orbits around stars, we find that it is likely that the median orbital semimajor axis is >30 AU.},
doi = {10.1088/0004-637X/757/2/119},
url = {https://www.osti.gov/biblio/22092218},
journal = {Astrophysical Journal},
issn = {0004-637X},
number = 2,
volume = 757,
place = {United States},
year = {Mon Oct 01 00:00:00 EDT 2012},
month = {Mon Oct 01 00:00:00 EDT 2012}
}