First assessment of the binary lens OGLE-2015-BLG-0232

E. Bachelet; V. Bozza; C. Han; A. Udalski; I. A. Bond; J.-P. Beaulieu; R. A. Street; J.-I Kim; D. M. Bramich; A. Cassan; M. Dominik; R. Figuera Jaimes; K. Horne; M. Hundertmark; S. Mao; J. Menzies; C. Ranc; R. Schmidt; C. Snodgrass; I. A. Steele; Y. Tsapras; J. Wambsganss; P. Mróz; I. Soszyński; M. K. Szymański; J. Skowron; P. Pietrukowicz; S. Kozłowski; R. Poleski; K. Ulaczyk; M. Pawlak; F. Abe; R. Barry; D. P. Bennett; A. Bhattacharya; M. Donachie; A. Fukui; Y. Hirao; Y. Itow; K. Kawasaki; I. Kondo; N. Koshimoto; M. Cheung Alex Li; Y. Matsubara; Y. Muraki; S. Miyazaki; M. Nagakane; N. J. Rattenbury; H. Suematsu; D. J. Sullivan; T. Sumi; D. Suzuki; P. J. Tristram; A. Yonehara

doi:10.3847/1538-4357/aaedb9

First assessment of the binary lens OGLE-2015-BLG-0232

E. Bachelet, V. Bozza, C. Han, A. Udalski, I. A. Bond, J.-P. Beaulieu, R. A. Street, J.-I Kim, D. M. Bramich, A. Cassan, M. Dominik, R. Figuera Jaimes, K. Horne, M. Hundertmark, S. Mao, J. Menzies, C. Ranc, R. Schmidt, C. Snodgrass, I. A. SteeleY. Tsapras, J. Wambsganss, P. Mróz, I. Soszyński, M. K. Szymański, J. Skowron, P. Pietrukowicz, S. Kozłowski, R. Poleski, K. Ulaczyk, M. Pawlak, F. Abe, R. Barry, D. P. Bennett, A. Bhattacharya, M. Donachie, A. Fukui, Y. Hirao, Y. Itow, K. Kawasaki, I. Kondo, N. Koshimoto, M. Cheung Alex Li, Y. Matsubara, Y. Muraki, S. Miyazaki, M. Nagakane, N. J. Rattenbury, H. Suematsu, D. J. Sullivan, T. Sumi, D. Suzuki, P. J. Tristram, A. Yonehara

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Abstract

We present an analysis of the microlensing event OGLE-2015-BLG-0232. This event is challenging to characterize for two reasons. First, the light curve is not well sampled during the caustic crossing due to the proximity of the full Moon impacting the photometry quality. Moreover, the source brightness is difficult to estimate because this event is blended with a nearby K dwarf star. We found that the light curve deviations are likely due to a close brown dwarf companion (i.e., s = 0.55 and q = 0.06), but the exact nature of the lens is still unknown. We finally discuss the potential of follow-up observations to estimate the lens mass and distance in the future.

Original language	English
Article number	11
Journal	Astrophysical Journal
Volume	870
Issue number	1
DOIs	https://doi.org/10.3847/1538-4357/aaedb9
Publication status	Published - 27 Dec 2018

Keywords

Gravitational microlensing

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10.3847/1538-4357/aaedb9

Bachelet-2018-First-assessment-ApJ-AAM
Copyright © 2018 The American Astronomical Society. All rights reserved. This work has been made available online in accordance with the publisher's policies. This is the author created accepted version manuscript following peer review and as such may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.3847/1538-4357/aaedb9
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http://adsabs.harvard.edu/abs/2018arXiv181102715B

Astronomy at St Andrews 2015-2018: Astronomy at St Andrews 2015-2018
Jardine, M. M. (PI), Cameron, A. C. (CoI), Cyganowski, C. J. (CoI), Horne, K. D. (CoI) & Wood, K. (CoI)
Science & Technology Facilities Council
1/04/15 → 31/03/18
Project: Standard

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Bachelet, E., Bozza, V., Han, C., Udalski, A., Bond, I. A., Beaulieu, J.-P., Street, R. A., Kim, J. .-I., Bramich, D. M., Cassan, A., Dominik, M., Figuera Jaimes, R., Horne, K., Hundertmark, M., Mao, S., Menzies, J., Ranc, C., Schmidt, R., Snodgrass, C., ... Yonehara, A. (2018). First assessment of the binary lens OGLE-2015-BLG-0232. Astrophysical Journal, 870(1), Article 11. https://doi.org/10.3847/1538-4357/aaedb9

@article{fdbf22e69b844055bef1b6ad9c3e05de,

title = "First assessment of the binary lens OGLE-2015-BLG-0232",

abstract = "We present an analysis of the microlensing event OGLE-2015-BLG-0232. This event is challenging to characterize for two reasons. First, the light curve is not well sampled during the caustic crossing due to the proximity of the full Moon impacting the photometry quality. Moreover, the source brightness is difficult to estimate because this event is blended with a nearby K dwarf star. We found that the light curve deviations are likely due to a close brown dwarf companion (i.e., s = 0.55 and q = 0.06), but the exact nature of the lens is still unknown. We finally discuss the potential of follow-up observations to estimate the lens mass and distance in the future.",

keywords = "Gravitational microlensing",

author = "E. Bachelet and V. Bozza and C. Han and A. Udalski and Bond, {I. A.} and J.-P. Beaulieu and Street, {R. A.} and J.-I Kim and Bramich, {D. M.} and A. Cassan and M. Dominik and {Figuera Jaimes}, R. and K. Horne and M. Hundertmark and S. Mao and J. Menzies and C. Ranc and R. Schmidt and C. Snodgrass and Steele, {I. A.} and Y. Tsapras and J. Wambsganss and P. Mr{\'o}z and I. Soszy{\'n}ski and Szyma{\'n}ski, {M. K.} and J. Skowron and P. Pietrukowicz and S. Koz{\l}owski and R. Poleski and K. Ulaczyk and M. Pawlak and F. Abe and R. Barry and Bennett, {D. P.} and A. Bhattacharya and M. Donachie and A. Fukui and Y. Hirao and Y. Itow and K. Kawasaki and I. Kondo and N. Koshimoto and Li, {M. Cheung Alex} and Y. Matsubara and Y. Muraki and S. Miyazaki and M. Nagakane and Rattenbury, {N. J.} and H. Suematsu and Sullivan, {D. J.} and T. Sumi and D. Suzuki and Tristram, {P. J.} and A. Yonehara",

year = "2018",

month = dec,

day = "27",

doi = "10.3847/1538-4357/aaedb9",

language = "English",

volume = "870",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "American Astronomical Society",

number = "1",

}

Bachelet, E, Bozza, V, Han, C, Udalski, A, Bond, IA, Beaulieu, J-P, Street, RA, Kim, J-I, Bramich, DM, Cassan, A, Dominik, M, Figuera Jaimes, R, Horne, K, Hundertmark, M, Mao, S, Menzies, J, Ranc, C, Schmidt, R, Snodgrass, C, Steele, IA, Tsapras, Y, Wambsganss, J, Mróz, P, Soszyński, I, Szymański, MK, Skowron, J, Pietrukowicz, P, Kozłowski, S, Poleski, R, Ulaczyk, K, Pawlak, M, Abe, F, Barry, R, Bennett, DP, Bhattacharya, A, Donachie, M, Fukui, A, Hirao, Y, Itow, Y, Kawasaki, K, Kondo, I, Koshimoto, N, Li, MCA, Matsubara, Y, Muraki, Y, Miyazaki, S, Nagakane, M, Rattenbury, NJ, Suematsu, H, Sullivan, DJ, Sumi, T, Suzuki, D, Tristram, PJ & Yonehara, A 2018, 'First assessment of the binary lens OGLE-2015-BLG-0232', Astrophysical Journal, vol. 870, no. 1, 11. https://doi.org/10.3847/1538-4357/aaedb9

TY - JOUR

T1 - First assessment of the binary lens OGLE-2015-BLG-0232

AU - Bachelet, E.

AU - Bozza, V.

AU - Han, C.

AU - Udalski, A.

AU - Bond, I. A.

AU - Beaulieu, J.-P.

AU - Street, R. A.

AU - Kim, J.-I

AU - Bramich, D. M.

AU - Cassan, A.

AU - Dominik, M.

AU - Figuera Jaimes, R.

AU - Horne, K.

AU - Hundertmark, M.

AU - Mao, S.

AU - Menzies, J.

AU - Ranc, C.

AU - Schmidt, R.

AU - Snodgrass, C.

AU - Steele, I. A.

AU - Tsapras, Y.

AU - Wambsganss, J.

AU - Mróz, P.

AU - Soszyński, I.

AU - Szymański, M. K.

AU - Skowron, J.

AU - Pietrukowicz, P.

AU - Kozłowski, S.

AU - Poleski, R.

AU - Ulaczyk, K.

AU - Pawlak, M.

AU - Abe, F.

AU - Barry, R.

AU - Bennett, D. P.

AU - Bhattacharya, A.

AU - Donachie, M.

AU - Fukui, A.

AU - Hirao, Y.

AU - Itow, Y.

AU - Kawasaki, K.

AU - Kondo, I.

AU - Koshimoto, N.

AU - Li, M. Cheung Alex

AU - Matsubara, Y.

AU - Muraki, Y.

AU - Miyazaki, S.

AU - Nagakane, M.

AU - Rattenbury, N. J.

AU - Suematsu, H.

AU - Sullivan, D. J.

AU - Sumi, T.

AU - Suzuki, D.

AU - Tristram, P. J.

AU - Yonehara, A.

PY - 2018/12/27

Y1 - 2018/12/27

N2 - We present an analysis of the microlensing event OGLE-2015-BLG-0232. This event is challenging to characterize for two reasons. First, the light curve is not well sampled during the caustic crossing due to the proximity of the full Moon impacting the photometry quality. Moreover, the source brightness is difficult to estimate because this event is blended with a nearby K dwarf star. We found that the light curve deviations are likely due to a close brown dwarf companion (i.e., s = 0.55 and q = 0.06), but the exact nature of the lens is still unknown. We finally discuss the potential of follow-up observations to estimate the lens mass and distance in the future.

AB - We present an analysis of the microlensing event OGLE-2015-BLG-0232. This event is challenging to characterize for two reasons. First, the light curve is not well sampled during the caustic crossing due to the proximity of the full Moon impacting the photometry quality. Moreover, the source brightness is difficult to estimate because this event is blended with a nearby K dwarf star. We found that the light curve deviations are likely due to a close brown dwarf companion (i.e., s = 0.55 and q = 0.06), but the exact nature of the lens is still unknown. We finally discuss the potential of follow-up observations to estimate the lens mass and distance in the future.

KW - Gravitational microlensing

U2 - 10.3847/1538-4357/aaedb9

DO - 10.3847/1538-4357/aaedb9

M3 - Article

SN - 0004-637X

VL - 870

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1

M1 - 11

ER -

First assessment of the binary lens OGLE-2015-BLG-0232

Abstract

Keywords

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Astronomy at St Andrews 2015-2018: Astronomy at St Andrews 2015-2018

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