OGLE-2017-BLG-1130: The First Binary Gravitational Microlens Detected from              Spitzer Only

Tianshu Wang; S. Calchi Novati; A. Udalski; A. Gould; Shude Mao; W. Zang; C. Beichman; G. Bryden; S. Carey; B. S. Gaudi; C. B. Henderson; Y. Shvartzvald; J. C. Yee; P. Mróz; R. Poleski; J. Skowron; M. K. Szymański; I. Soszyński; S. Kozłowski; P. Pietrukowicz; K. Ulaczyk; M. Pawlak; M. D. Albrow; S.-j. Chung; C. Han; K.-h. Hwang; Y. K. Jung; Y.-h. Ryu; I.-g. Shin; W. Zhu; S.-m. Cha; D.-j. Kim; H.-w. Kim; S.-l. Kim; C.-u. Lee; D.-j. Lee; Y. Lee; B.-g. Park; R. W. Pogge

doi:10.3847/1538-4357/aabcd2

OGLE-2017-BLG-1130: The First Binary Gravitational Microlens Detected from Spitzer Only

Tianshu Wang, S. Calchi Novati, A. Udalski, A. Gould, Shude Mao, W. Zang, C. Beichman, G. Bryden, S. Carey, B. S. Gaudi, C. B. Henderson, Y. Shvartzvald, J. C. Yee, P. Mróz, R. Poleski, J. Skowron, M. K. Szymański, I. Soszyński, S. Kozłowski, P. PietrukowiczK. Ulaczyk, M. Pawlak, M. D. Albrow, S.-j. Chung, C. Han, K.-h. Hwang, Y. K. Jung, Y.-h. Ryu, I.-g. Shin, W. Zhu, S.-m. Cha, D.-j. Kim, H.-w. Kim, S.-l. Kim, C.-u. Lee, D.-j. Lee, Y. Lee, B.-g. Park, R. W. Pogge

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Abstract

We analyze the binary gravitational microlensing event OGLE-2017-BLG-1130 (mass ratio q ~ 0.45), the first published case in which the binary anomaly was detected only by the Spitzer Space Telescope. This event provides strong evidence that some binary signals can be missed by observations from the ground alone but detected by Spitzer. We therefore invert the normal procedure, first finding the lens parameters by fitting the space-based data and then measuring the microlensing parallax using ground-based observations. We also show that the normal four-fold space-based degeneracy in the single-lens case can become a weak eight-fold degeneracy in binary-lens events. Although this degeneracy is resolved in event OGLE-2017-BLG-1130, it might persist in other events.

Original language	English
Pages (from-to)	25
Journal	The Astrophysical Journal
Volume	860
Issue number	1
Early online date	7 Jun 2018
DOIs	https://doi.org/10.3847/1538-4357/aabcd2
Publication status	Published - 2018

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Wang, T., Calchi Novati, S., Udalski, A., Gould, A., Mao, S., Zang, W., Beichman, C., Bryden, G., Carey, S., Gaudi, B. S., Henderson, C. B., Shvartzvald, Y., Yee, J. C., Mróz, P., Poleski, R., Skowron, J., Szymański, M. K., Soszyński, I., Kozłowski, S., ... Pogge, R. W. (2018). OGLE-2017-BLG-1130: The First Binary Gravitational Microlens Detected from Spitzer Only. The Astrophysical Journal, 860(1), 25. https://doi.org/10.3847/1538-4357/aabcd2

@article{84469b7b4bc74844b1474132cf53d2b0,

title = "OGLE-2017-BLG-1130: The First Binary Gravitational Microlens Detected from Spitzer Only",

abstract = "We analyze the binary gravitational microlensing event OGLE-2017-BLG-1130 (mass ratio q ~ 0.45), the first published case in which the binary anomaly was detected only by the Spitzer Space Telescope. This event provides strong evidence that some binary signals can be missed by observations from the ground alone but detected by Spitzer. We therefore invert the normal procedure, first finding the lens parameters by fitting the space-based data and then measuring the microlensing parallax using ground-based observations. We also show that the normal four-fold space-based degeneracy in the single-lens case can become a weak eight-fold degeneracy in binary-lens events. Although this degeneracy is resolved in event OGLE-2017-BLG-1130, it might persist in other events.",

author = "Tianshu Wang and {Calchi Novati}, S. and A. Udalski and A. Gould and Shude Mao and W. Zang and C. Beichman and G. Bryden and S. Carey and Gaudi, {B. S.} and Henderson, {C. B.} and Y. Shvartzvald and Yee, {J. C.} and P. Mr{\'o}z and R. Poleski and J. Skowron and Szyma{\'n}ski, {M. K.} and I. Soszy{\'n}ski and S. Koz{\l}owski and P. Pietrukowicz and K. Ulaczyk and M. Pawlak and Albrow, {M. D.} and S.-j. Chung and C. Han and K.-h. Hwang and Jung, {Y. K.} and Y.-h. Ryu and I.-g. Shin and W. Zhu and S.-m. Cha and D.-j. Kim and H.-w. Kim and S.-l. Kim and C.-u. Lee and D.-j. Lee and Y. Lee and B.-g. Park and Pogge, {R. W.}",

year = "2018",

doi = "10.3847/1538-4357/aabcd2",

language = "English",

volume = "860",

pages = "25",

journal = "The Astrophysical Journal",

issn = "0004-637X",

publisher = "Institute of Physics Publishing, Inc",

number = "1",

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Wang, T, Calchi Novati, S, Udalski, A, Gould, A, Mao, S, Zang, W, Beichman, C, Bryden, G, Carey, S, Gaudi, BS, Henderson, CB, Shvartzvald, Y, Yee, JC, Mróz, P, Poleski, R, Skowron, J, Szymański, MK, Soszyński, I, Kozłowski, S, Pietrukowicz, P, Ulaczyk, K, Pawlak, M, Albrow, MD, Chung, S, Han, C, Hwang, K, Jung, YK, Ryu, Y, Shin, I, Zhu, W, Cha, S, Kim, D, Kim, H, Kim, S, Lee, C, Lee, D, Lee, Y, Park, B & Pogge, RW 2018, 'OGLE-2017-BLG-1130: The First Binary Gravitational Microlens Detected from Spitzer Only', The Astrophysical Journal, vol. 860, no. 1, pp. 25. https://doi.org/10.3847/1538-4357/aabcd2

TY - JOUR

T1 - OGLE-2017-BLG-1130: The First Binary Gravitational Microlens Detected from Spitzer Only

AU - Wang, Tianshu

AU - Calchi Novati, S.

AU - Udalski, A.

AU - Gould, A.

AU - Mao, Shude

AU - Zang, W.

AU - Beichman, C.

AU - Bryden, G.

AU - Carey, S.

AU - Gaudi, B. S.

AU - Henderson, C. B.

AU - Shvartzvald, Y.

AU - Yee, J. C.

AU - Mróz, P.

AU - Poleski, R.

AU - Skowron, J.

AU - Szymański, M. K.

AU - Soszyński, I.

AU - Kozłowski, S.

AU - Pietrukowicz, P.

AU - Ulaczyk, K.

AU - Pawlak, M.

AU - Albrow, M. D.

AU - Chung, S.-j.

AU - Han, C.

AU - Hwang, K.-h.

AU - Jung, Y. K.

AU - Ryu, Y.-h.

AU - Shin, I.-g.

AU - Zhu, W.

AU - Cha, S.-m.

AU - Kim, D.-j.

AU - Kim, H.-w.

AU - Kim, S.-l.

AU - Lee, C.-u.

AU - Lee, D.-j.

AU - Lee, Y.

AU - Park, B.-g.

AU - Pogge, R. W.

PY - 2018

Y1 - 2018

N2 - We analyze the binary gravitational microlensing event OGLE-2017-BLG-1130 (mass ratio q ~ 0.45), the first published case in which the binary anomaly was detected only by the Spitzer Space Telescope. This event provides strong evidence that some binary signals can be missed by observations from the ground alone but detected by Spitzer. We therefore invert the normal procedure, first finding the lens parameters by fitting the space-based data and then measuring the microlensing parallax using ground-based observations. We also show that the normal four-fold space-based degeneracy in the single-lens case can become a weak eight-fold degeneracy in binary-lens events. Although this degeneracy is resolved in event OGLE-2017-BLG-1130, it might persist in other events.

AB - We analyze the binary gravitational microlensing event OGLE-2017-BLG-1130 (mass ratio q ~ 0.45), the first published case in which the binary anomaly was detected only by the Spitzer Space Telescope. This event provides strong evidence that some binary signals can be missed by observations from the ground alone but detected by Spitzer. We therefore invert the normal procedure, first finding the lens parameters by fitting the space-based data and then measuring the microlensing parallax using ground-based observations. We also show that the normal four-fold space-based degeneracy in the single-lens case can become a weak eight-fold degeneracy in binary-lens events. Although this degeneracy is resolved in event OGLE-2017-BLG-1130, it might persist in other events.

U2 - 10.3847/1538-4357/aabcd2

DO - 10.3847/1538-4357/aabcd2

M3 - Article

SN - 0004-637X

VL - 860

SP - 25

JO - The Astrophysical Journal

JF - The Astrophysical Journal

IS - 1

ER -

OGLE-2017-BLG-1130: The First Binary Gravitational Microlens Detected from Spitzer Only

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