OGLE-2017-BLG-0329L: A Microlensing Binary Characterized with Dramatically Enhanced Precision Using Data from Space-based Observations

MiNDSTEp Collaboration, KMTNet Collaboration, OGLE Collaboration, Spitzer Team, C. Han (Lead / Corresponding author), S. Calchi Novati, A. Udalski, C. -U. Lee, A. Gould, V. Bozza, P. Mróz, P. Pietrukowicz, J. Skowron, M. K. Szymański, R. Poleski, I. Soszyński, S. Kozłowski, K. Ulaczyk, M. Pawlak, K. RybickiP. Iwanek, M. D. Albrow, S. -J. Chung, K. -H. Hwang, Y. K. Jung, Y. -H. Ryu, I. -G. Shin, Y. Shvartzvald, J. C. Yee, W. Zang, W. Zhu, S. -M. Cha, D. -J. Kim, H. -W. Kim, S. -L. Kim, D. -J. Lee, Y. Lee, B. -G. Park, R. W. Pogge, W. -T. Kim, C. Beichman, G. Bryden, S. Carey, B. S. Gaudi, C. B. Henderson, M. Dominik, C. Helling, M. Hundertmark, U. G. Jørgensen, P. Longa-Peña, S. Lowry, S. Sajadian, M. J. Burgdorf, J. Campbell-White, Simona Ciceri, D. F. Evans, L. K. Haikala, T. C. Hinse, S. Rahvar, M. Rabus, C. Snodgrass

Research output: Contribution to journalArticle

3 Citations (Scopus)
17 Downloads (Pure)

Abstract

Mass measurements of gravitational microlenses require one to determine the microlens parallax πE, but precise πE measurement, in many cases, is hampered due to the subtlety of the microlens-parallax signal combined with the difficulty of distinguishing the signal from those induced by other higher-order effects. In this work, we present the analysis of the binary-lens event OGLE-2017-BLG-0329, for which πE is measured with a dramatically improved precision using additional data from space-based Spitzer observations. We find that while the parallax model based on the ground-based data cannot be distinguished from a zero-πE model at the 2σ level, the addition of the Spitzer data enables us to identify two classes of solutions, each composed of a pair of solutions according to the wellknown ecliptic degeneracy. It is found that the space-based data reduce the measurement uncertainties of the north and east components of the microlens-parallax vector pE by factors ∼18 and ∼4, respectively. With the measured microlens parallax combined with the angular Einstein radius measured from the resolved caustic crossings, we find that the lens is composed of a binary with component masses of either (M1, M2) ∼ (1.1, 0.8) Me or ∼(0.4, 0.3) Me according to the two solution classes. The first solution is significantly favored but the second cannot be securely ruled out based on the microlensing data alone. However, the degeneracy can be resolved from adaptive optics observations taken ∼10 years after the event.
Original languageEnglish
Article number82
Pages (from-to)1-10
Number of pages10
JournalAstrophysical Journal
Volume859
Issue number2
DOIs
Publication statusPublished - 25 May 2018

Fingerprint

parallax
lenses
ecliptic
adaptive optics
alkalies
radii

Keywords

  • binaries: general
  • gravitational lensing: micro

Cite this

MiNDSTEp Collaboration, KMTNet Collaboration, OGLE Collaboration, Spitzer Team, Han, C., Calchi Novati, S., ... Snodgrass, C. (2018). OGLE-2017-BLG-0329L: A Microlensing Binary Characterized with Dramatically Enhanced Precision Using Data from Space-based Observations. Astrophysical Journal, 859(2), 1-10. [82]. https://doi.org/10.3847/1538-4357/aabd87
MiNDSTEp Collaboration ; KMTNet Collaboration ; OGLE Collaboration ; Spitzer Team ; Han, C. ; Calchi Novati, S. ; Udalski, A. ; Lee, C. -U. ; Gould, A. ; Bozza, V. ; Mróz, P. ; Pietrukowicz, P. ; Skowron, J. ; Szymański, M. K. ; Poleski, R. ; Soszyński, I. ; Kozłowski, S. ; Ulaczyk, K. ; Pawlak, M. ; Rybicki, K. ; Iwanek, P. ; Albrow, M. D. ; Chung, S. -J. ; Hwang, K. -H. ; Jung, Y. K. ; Ryu, Y. -H. ; Shin, I. -G. ; Shvartzvald, Y. ; Yee, J. C. ; Zang, W. ; Zhu, W. ; Cha, S. -M. ; Kim, D. -J. ; Kim, H. -W. ; Kim, S. -L. ; Lee, D. -J. ; Lee, Y. ; Park, B. -G. ; Pogge, R. W. ; Kim, W. -T. ; Beichman, C. ; Bryden, G. ; Carey, S. ; Gaudi, B. S. ; Henderson, C. B. ; Dominik, M. ; Helling, C. ; Hundertmark, M. ; Jørgensen, U. G. ; Longa-Peña, P. ; Lowry, S. ; Sajadian, S. ; Burgdorf, M. J. ; Campbell-White, J. ; Ciceri, Simona ; Evans, D. F. ; Haikala, L. K. ; Hinse, T. C. ; Rahvar, S. ; Rabus, M. ; Snodgrass, C. / OGLE-2017-BLG-0329L : A Microlensing Binary Characterized with Dramatically Enhanced Precision Using Data from Space-based Observations. In: Astrophysical Journal. 2018 ; Vol. 859, No. 2. pp. 1-10.
@article{b6b553e5b91c4c378bb51693c5737907,
title = "OGLE-2017-BLG-0329L: A Microlensing Binary Characterized with Dramatically Enhanced Precision Using Data from Space-based Observations",
abstract = "Mass measurements of gravitational microlenses require one to determine the microlens parallax πE, but precise πE measurement, in many cases, is hampered due to the subtlety of the microlens-parallax signal combined with the difficulty of distinguishing the signal from those induced by other higher-order effects. In this work, we present the analysis of the binary-lens event OGLE-2017-BLG-0329, for which πE is measured with a dramatically improved precision using additional data from space-based Spitzer observations. We find that while the parallax model based on the ground-based data cannot be distinguished from a zero-πE model at the 2σ level, the addition of the Spitzer data enables us to identify two classes of solutions, each composed of a pair of solutions according to the wellknown ecliptic degeneracy. It is found that the space-based data reduce the measurement uncertainties of the north and east components of the microlens-parallax vector pE by factors ∼18 and ∼4, respectively. With the measured microlens parallax combined with the angular Einstein radius measured from the resolved caustic crossings, we find that the lens is composed of a binary with component masses of either (M1, M2) ∼ (1.1, 0.8) Me or ∼(0.4, 0.3) Me according to the two solution classes. The first solution is significantly favored but the second cannot be securely ruled out based on the microlensing data alone. However, the degeneracy can be resolved from adaptive optics observations taken ∼10 years after the event.",
keywords = "binaries: general, gravitational lensing: micro",
author = "{MiNDSTEp Collaboration} and {KMTNet Collaboration} and {OGLE Collaboration} and {Spitzer Team} and C. Han and {Calchi Novati}, S. and A. Udalski and Lee, {C. -U.} and A. Gould and V. Bozza and P. Mr{\'o}z and P. Pietrukowicz and J. Skowron and Szymański, {M. K.} and R. Poleski and I. Soszyński and S. Kozłowski and K. Ulaczyk and M. Pawlak and K. Rybicki and P. Iwanek and Albrow, {M. D.} and Chung, {S. -J.} and Hwang, {K. -H.} and Jung, {Y. K.} and Ryu, {Y. -H.} and Shin, {I. -G.} and Y. Shvartzvald and Yee, {J. C.} and W. Zang and W. Zhu and Cha, {S. -M.} and Kim, {D. -J.} and Kim, {H. -W.} and Kim, {S. -L.} and Lee, {D. -J.} and Y. Lee and Park, {B. -G.} and Pogge, {R. W.} and Kim, {W. -T.} and C. Beichman and G. Bryden and S. Carey and Gaudi, {B. S.} and Henderson, {C. B.} and M. Dominik and C. Helling and M. Hundertmark and J{\o}rgensen, {U. G.} and P. Longa-Pe{\~n}a and S. Lowry and S. Sajadian and Burgdorf, {M. J.} and J. Campbell-White and Simona Ciceri and Evans, {D. F.} and Haikala, {L. K.} and Hinse, {T. C.} and S. Rahvar and M. Rabus and C. Snodgrass",
year = "2018",
month = "5",
day = "25",
doi = "10.3847/1538-4357/aabd87",
language = "English",
volume = "859",
pages = "1--10",
journal = "Astrophysical Journal",
issn = "0004-637X",
publisher = "American Astronomical Society",
number = "2",

}

MiNDSTEp Collaboration, KMTNet Collaboration, OGLE Collaboration, Spitzer Team, Han, C, Calchi Novati, S, Udalski, A, Lee, C-U, Gould, A, Bozza, V, Mróz, P, Pietrukowicz, P, Skowron, J, Szymański, MK, Poleski, R, Soszyński, I, Kozłowski, S, Ulaczyk, K, Pawlak, M, Rybicki, K, Iwanek, P, Albrow, MD, Chung, S-J, Hwang, K-H, Jung, YK, Ryu, Y-H, Shin, I-G, Shvartzvald, Y, Yee, JC, Zang, W, Zhu, W, Cha, S-M, Kim, D-J, Kim, H-W, Kim, S-L, Lee, D-J, Lee, Y, Park, B-G, Pogge, RW, Kim, W-T, Beichman, C, Bryden, G, Carey, S, Gaudi, BS, Henderson, CB, Dominik, M, Helling, C, Hundertmark, M, Jørgensen, UG, Longa-Peña, P, Lowry, S, Sajadian, S, Burgdorf, MJ, Campbell-White, J, Ciceri, S, Evans, DF, Haikala, LK, Hinse, TC, Rahvar, S, Rabus, M & Snodgrass, C 2018, 'OGLE-2017-BLG-0329L: A Microlensing Binary Characterized with Dramatically Enhanced Precision Using Data from Space-based Observations', Astrophysical Journal, vol. 859, no. 2, 82, pp. 1-10. https://doi.org/10.3847/1538-4357/aabd87

OGLE-2017-BLG-0329L : A Microlensing Binary Characterized with Dramatically Enhanced Precision Using Data from Space-based Observations. / MiNDSTEp Collaboration; KMTNet Collaboration; OGLE Collaboration; Spitzer Team; Han, C. (Lead / Corresponding author); Calchi Novati, S.; Udalski, A.; Lee, C. -U.; Gould, A.; Bozza, V.; Mróz, P.; Pietrukowicz, P.; Skowron, J.; Szymański, M. K.; Poleski, R.; Soszyński, I.; Kozłowski, S.; Ulaczyk, K.; Pawlak, M.; Rybicki, K.; Iwanek, P.; Albrow, M. D.; Chung, S. -J.; Hwang, K. -H.; Jung, Y. K.; Ryu, Y. -H.; Shin, I. -G.; Shvartzvald, Y.; Yee, J. C.; Zang, W.; Zhu, W.; Cha, S. -M.; Kim, D. -J.; Kim, H. -W.; Kim, S. -L.; Lee, D. -J.; Lee, Y.; Park, B. -G.; Pogge, R. W.; Kim, W. -T.; Beichman, C.; Bryden, G.; Carey, S.; Gaudi, B. S.; Henderson, C. B.; Dominik, M.; Helling, C.; Hundertmark, M.; Jørgensen, U. G.; Longa-Peña, P.; Lowry, S.; Sajadian, S.; Burgdorf, M. J.; Campbell-White, J.; Ciceri, Simona; Evans, D. F.; Haikala, L. K.; Hinse, T. C.; Rahvar, S.; Rabus, M. ; Snodgrass, C.

In: Astrophysical Journal, Vol. 859, No. 2, 82, 25.05.2018, p. 1-10.

Research output: Contribution to journalArticle

TY - JOUR

T1 - OGLE-2017-BLG-0329L

T2 - A Microlensing Binary Characterized with Dramatically Enhanced Precision Using Data from Space-based Observations

AU - MiNDSTEp Collaboration

AU - KMTNet Collaboration

AU - OGLE Collaboration

AU - Spitzer Team

AU - Han, C.

AU - Calchi Novati, S.

AU - Udalski, A.

AU - Lee, C. -U.

AU - Gould, A.

AU - Bozza, V.

AU - Mróz, P.

AU - Pietrukowicz, P.

AU - Skowron, J.

AU - Szymański, M. K.

AU - Poleski, R.

AU - Soszyński, I.

AU - Kozłowski, S.

AU - Ulaczyk, K.

AU - Pawlak, M.

AU - Rybicki, K.

AU - Iwanek, P.

AU - Albrow, M. D.

AU - Chung, S. -J.

AU - Hwang, K. -H.

AU - Jung, Y. K.

AU - Ryu, Y. -H.

AU - Shin, I. -G.

AU - Shvartzvald, Y.

AU - Yee, J. C.

AU - Zang, W.

AU - Zhu, W.

AU - Cha, S. -M.

AU - Kim, D. -J.

AU - Kim, H. -W.

AU - Kim, S. -L.

AU - Lee, D. -J.

AU - Lee, Y.

AU - Park, B. -G.

AU - Pogge, R. W.

AU - Kim, W. -T.

AU - Beichman, C.

AU - Bryden, G.

AU - Carey, S.

AU - Gaudi, B. S.

AU - Henderson, C. B.

AU - Dominik, M.

AU - Helling, C.

AU - Hundertmark, M.

AU - Jørgensen, U. G.

AU - Longa-Peña, P.

AU - Lowry, S.

AU - Sajadian, S.

AU - Burgdorf, M. J.

AU - Campbell-White, J.

AU - Ciceri, Simona

AU - Evans, D. F.

AU - Haikala, L. K.

AU - Hinse, T. C.

AU - Rahvar, S.

AU - Rabus, M.

AU - Snodgrass, C.

PY - 2018/5/25

Y1 - 2018/5/25

N2 - Mass measurements of gravitational microlenses require one to determine the microlens parallax πE, but precise πE measurement, in many cases, is hampered due to the subtlety of the microlens-parallax signal combined with the difficulty of distinguishing the signal from those induced by other higher-order effects. In this work, we present the analysis of the binary-lens event OGLE-2017-BLG-0329, for which πE is measured with a dramatically improved precision using additional data from space-based Spitzer observations. We find that while the parallax model based on the ground-based data cannot be distinguished from a zero-πE model at the 2σ level, the addition of the Spitzer data enables us to identify two classes of solutions, each composed of a pair of solutions according to the wellknown ecliptic degeneracy. It is found that the space-based data reduce the measurement uncertainties of the north and east components of the microlens-parallax vector pE by factors ∼18 and ∼4, respectively. With the measured microlens parallax combined with the angular Einstein radius measured from the resolved caustic crossings, we find that the lens is composed of a binary with component masses of either (M1, M2) ∼ (1.1, 0.8) Me or ∼(0.4, 0.3) Me according to the two solution classes. The first solution is significantly favored but the second cannot be securely ruled out based on the microlensing data alone. However, the degeneracy can be resolved from adaptive optics observations taken ∼10 years after the event.

AB - Mass measurements of gravitational microlenses require one to determine the microlens parallax πE, but precise πE measurement, in many cases, is hampered due to the subtlety of the microlens-parallax signal combined with the difficulty of distinguishing the signal from those induced by other higher-order effects. In this work, we present the analysis of the binary-lens event OGLE-2017-BLG-0329, for which πE is measured with a dramatically improved precision using additional data from space-based Spitzer observations. We find that while the parallax model based on the ground-based data cannot be distinguished from a zero-πE model at the 2σ level, the addition of the Spitzer data enables us to identify two classes of solutions, each composed of a pair of solutions according to the wellknown ecliptic degeneracy. It is found that the space-based data reduce the measurement uncertainties of the north and east components of the microlens-parallax vector pE by factors ∼18 and ∼4, respectively. With the measured microlens parallax combined with the angular Einstein radius measured from the resolved caustic crossings, we find that the lens is composed of a binary with component masses of either (M1, M2) ∼ (1.1, 0.8) Me or ∼(0.4, 0.3) Me according to the two solution classes. The first solution is significantly favored but the second cannot be securely ruled out based on the microlensing data alone. However, the degeneracy can be resolved from adaptive optics observations taken ∼10 years after the event.

KW - binaries: general

KW - gravitational lensing: micro

U2 - 10.3847/1538-4357/aabd87

DO - 10.3847/1538-4357/aabd87

M3 - Article

VL - 859

SP - 1

EP - 10

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 2

M1 - 82

ER -

MiNDSTEp Collaboration, KMTNet Collaboration, OGLE Collaboration, Spitzer Team, Han C, Calchi Novati S et al. OGLE-2017-BLG-0329L: A Microlensing Binary Characterized with Dramatically Enhanced Precision Using Data from Space-based Observations. Astrophysical Journal. 2018 May 25;859(2):1-10. 82. https://doi.org/10.3847/1538-4357/aabd87