The First Simultaneous Microlensing Observations by Two Space telescopes: Spitzer and Swift Reveal a Brown Dwarf in Event OGLE-2015-BLG-1319

Y. Shvartzvald; Z. Li; A. Udalski; A. Gould; T. Sumi; R. A. Street; S. Calchi Novati; M. Hundertmark; V. Bozza; C. Beichman; G. Bryden; S. Carey; J. Drummond; M. Fausnaugh; B. S. Gaudi; C. B. Henderson; T. G. Tan; B. Wibking; R. W. Pogge; J. C. Yee; W. Zhu; Y. Tsapras; E. Bachelet; M. Dominik; D. M. Bramich; A. Cassan; R. Figuera Jaimes; K. Horne; C. Ranc; R. Schmidt; C. Snodgrass; J. Wambsganss; I. A. Steele; J. Menzies; S. Mao; R. Poleski; M. Pawlak; M. K. Szymański; J. Skowron; P. Mróz; S. Kozłowski; Ł. Wyrzykowski; P. Pietrukowicz; I. Soszyński; K. Ulaczyk; F. Abe; Y. Asakura; R. K. Barry; D. P. Bennett; A. Bhattacharya; I. A. Bond; M. Freeman; Y. Hirao; Y. Itow; N. Koshimoto; M. C. A. Li; C. H. Ling; K. Masuda; A. Fukui; Y. Matsubara; Y. Muraki; M. Nagakane; T. Nishioka; K. Ohnishi; H. Oyokawa; N. J. Rattenbury; To. Saito; A. Sharan; D. J. Sullivan; D. Suzuki; P. J. Tristram; A. Yonehara; [Ukendt] (MOA Group; U. G. Jørgensen; M. J. Burgdorf; S. Ciceri; G. D'Ago; D. F. Evans; T. C. Hinse; N. Kains; E. Kerins; H. Korhonen; L. Mancini; A. Popovas; M. Rabus; S. Rahvar; G. Scarpetta; Jesper Mirsa Skottfelt; J. Southworth; N. Peixinho; P. Verma; J. A. Kennea; N. Gehrels; P G F (Swift

doi:10.3847/0004-637X/831/2/183

The First Simultaneous Microlensing Observations by Two Space telescopes: Spitzer and Swift Reveal a Brown Dwarf in Event OGLE-2015-BLG-1319

Y. Shvartzvald, Z. Li, A. Udalski, A. Gould, T. Sumi, R. A. Street, S. Calchi Novati, M. Hundertmark, V. Bozza, C. Beichman, G. Bryden, S. Carey, J. Drummond, M. Fausnaugh, B. S. Gaudi, C. B. Henderson, T. G. Tan, B. Wibking, R. W. Pogge, J. C. YeeW. Zhu, Y. Tsapras, E. Bachelet, M. Dominik, D. M. Bramich, A. Cassan, R. Figuera Jaimes, K. Horne, C. Ranc, R. Schmidt, C. Snodgrass, J. Wambsganss, I. A. Steele, J. Menzies, S. Mao, R. Poleski, M. Pawlak, M. K. Szymański, J. Skowron, P. Mróz, S. Kozłowski, Ł. Wyrzykowski, P. Pietrukowicz, I. Soszyński, K. Ulaczyk, F. Abe, Y. Asakura, R. K. Barry, D. P. Bennett, A. Bhattacharya, I. A. Bond, M. Freeman, Y. Hirao, Y. Itow, N. Koshimoto, M. C. A. Li, C. H. Ling, K. Masuda, A. Fukui, Y. Matsubara, Y. Muraki, M. Nagakane, T. Nishioka, K. Ohnishi, H. Oyokawa, N. J. Rattenbury, To. Saito, A. Sharan, D. J. Sullivan, D. Suzuki, P. J. Tristram, A. Yonehara, [Ukendt] (MOA Group, U. G. Jørgensen, M. J. Burgdorf, S. Ciceri, G. D'Ago, D. F. Evans, T. C. Hinse, N. Kains, E. Kerins, H. Korhonen, L. Mancini, A. Popovas, M. Rabus, S. Rahvar, G. Scarpetta, Jesper Mirsa Skottfelt, J. Southworth, N. Peixinho, P. Verma, J. A. Kennea, N. Gehrels, P G F (Swift

19 Citations (Scopus)

Abstract

Simultaneous observations of microlensing events from multiple locations allow for the breaking of degeneracies between the physical properties of the lensing system, specifically by exploring different regions of the lens plane and by directly measuring the “microlens parallax.” We report the discovery of a 30-65M J brown dwarf orbiting a K dwarf in the microlensing event OGLE-2015-BLG-1319. The system is located at a distance of ˜5 kpc toward the Galactic Bulge. The event was observed by several ground-based groups as well as by Spitzer and Swift, allowing a measurement of the physical properties. However, the event is still subject to an eight-fold degeneracy, in particular the well-known close-wide degeneracy, and thus the projected separation between the two lens components is either ˜0.25 au or ˜45 au. This is the first microlensing event observed by Swift, with the UVOT camera. We study the region of microlensing parameter space to which Swift is sensitive, finding that though Swift could not measure the microlens parallax with respect to ground-based observations for this event, it can be important for other events. Specifically, it is important for detecting nearby brown dwarfs and free-floating planets in high magnification events.

Original language	English
Article number	183
Journal	Astrophysical Journal
Volume	831
Issue number	2
ISSN	0004-637X
DOIs	https://doi.org/10.3847/0004-637X/831/2/183
Publication status	Published - 1 Nov 2016

Keywords

binaries: general
brown dwarfs
Galaxy: bulge
gravitational lensing: micro

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Shvartzvald, Y., Li, Z., Udalski, A., Gould, A., Sumi, T., Street, R. A., Calchi Novati, S., Hundertmark, M., Bozza, V., Beichman, C., Bryden, G., Carey, S., Drummond, J., Fausnaugh, M., Gaudi, B. S., Henderson, C. B., Tan, T. G., Wibking, B., Pogge, R. W., ... (Swift, P. G. F. (2016). The First Simultaneous Microlensing Observations by Two Space telescopes: Spitzer and Swift Reveal a Brown Dwarf in Event OGLE-2015-BLG-1319. Astrophysical Journal, 831(2), Article 183. https://doi.org/10.3847/0004-637X/831/2/183

Shvartzvald, Y, Li, Z, Udalski, A, Gould, A, Sumi, T, Street, RA, Calchi Novati, S, Hundertmark, M, Bozza, V, Beichman, C, Bryden, G, Carey, S, Drummond, J, Fausnaugh, M, Gaudi, BS, Henderson, CB, Tan, TG, Wibking, B, Pogge, RW, Yee, JC, Zhu, W, Tsapras, Y, Bachelet, E, Dominik, M, Bramich, DM, Cassan, A, Figuera Jaimes, R, Horne, K, Ranc, C, Schmidt, R, Snodgrass, C, Wambsganss, J, Steele, IA, Menzies, J, Mao, S, Poleski, R, Pawlak, M, Szymański, MK, Skowron, J, Mróz, P, Kozłowski, S, Wyrzykowski, Ł, Pietrukowicz, P, Soszyński, I, Ulaczyk, K, Abe, F, Asakura, Y, Barry, RK, Bennett, DP, Bhattacharya, A, Bond, IA, Freeman, M, Hirao, Y, Itow, Y, Koshimoto, N, Li, MCA, Ling, CH, Masuda, K, Fukui, A, Matsubara, Y, Muraki, Y, Nagakane, M, Nishioka, T, Ohnishi, K, Oyokawa, H, Rattenbury, NJ, Saito, T, Sharan, A, Sullivan, DJ, Suzuki, D, Tristram, PJ, Yonehara, A, (MOA Group, U, Jørgensen, UG, Burgdorf, MJ, Ciceri, S, D'Ago, G, Evans, DF, Hinse, TC, Kains, N, Kerins, E, Korhonen, H, Mancini, L, Popovas, A, Rabus, M, Rahvar, S, Scarpetta, G, Skottfelt, JM, Southworth, J, Peixinho, N, Verma, P, Kennea, JA, Gehrels, N & (Swift, PGF 2016, 'The First Simultaneous Microlensing Observations by Two Space telescopes: Spitzer and Swift Reveal a Brown Dwarf in Event OGLE-2015-BLG-1319', Astrophysical Journal, vol. 831, no. 2, 183. https://doi.org/10.3847/0004-637X/831/2/183

@article{c9c616f003dd4bbea410946da4603172,

title = "The First Simultaneous Microlensing Observations by Two Space telescopes: Spitzer and Swift Reveal a Brown Dwarf in Event OGLE-2015-BLG-1319",

abstract = "Simultaneous observations of microlensing events from multiple locations allow for the breaking of degeneracies between the physical properties of the lensing system, specifically by exploring different regions of the lens plane and by directly measuring the “microlens parallax.” We report the discovery of a 30-65M J brown dwarf orbiting a K dwarf in the microlensing event OGLE-2015-BLG-1319. The system is located at a distance of ˜5 kpc toward the Galactic Bulge. The event was observed by several ground-based groups as well as by Spitzer and Swift, allowing a measurement of the physical properties. However, the event is still subject to an eight-fold degeneracy, in particular the well-known close-wide degeneracy, and thus the projected separation between the two lens components is either ˜0.25 au or ˜45 au. This is the first microlensing event observed by Swift, with the UVOT camera. We study the region of microlensing parameter space to which Swift is sensitive, finding that though Swift could not measure the microlens parallax with respect to ground-based observations for this event, it can be important for other events. Specifically, it is important for detecting nearby brown dwarfs and free-floating planets in high magnification events.",

keywords = "binaries: general, brown dwarfs, Galaxy: bulge, gravitational lensing: micro",

author = "Y. Shvartzvald and Z. Li and A. Udalski and A. Gould and T. Sumi and Street, {R. A.} and {Calchi Novati}, S. and M. Hundertmark and V. Bozza and C. Beichman and G. Bryden and S. Carey and J. Drummond and M. Fausnaugh and Gaudi, {B. S.} and Henderson, {C. B.} and Tan, {T. G.} and B. Wibking and Pogge, {R. W.} and Yee, {J. C.} and W. Zhu and Y. Tsapras and E. Bachelet and M. Dominik and Bramich, {D. M.} and A. Cassan and {Figuera Jaimes}, R. and K. Horne and C. Ranc and R. Schmidt and C. Snodgrass and J. Wambsganss and Steele, {I. A.} and J. Menzies and S. Mao and R. Poleski and M. Pawlak and Szyma{\'n}ski, {M. K.} and J. Skowron and P. Mr{\'o}z and S. Koz{\l}owski and {\L}. Wyrzykowski and P. Pietrukowicz and I. Soszy{\'n}ski and K. Ulaczyk and F. Abe and Y. Asakura and Barry, {R. K.} and Bennett, {D. P.} and A. Bhattacharya and Bond, {I. A.} and M. Freeman and Y. Hirao and Y. Itow and N. Koshimoto and Li, {M. C. A.} and Ling, {C. H.} and K. Masuda and A. Fukui and Y. Matsubara and Y. Muraki and M. Nagakane and T. Nishioka and K. Ohnishi and H. Oyokawa and Rattenbury, {N. J.} and To. Saito and A. Sharan and Sullivan, {D. J.} and D. Suzuki and Tristram, {P. J.} and A. Yonehara and {(MOA Group}, [Ukendt] and J{\o}rgensen, {U. G.} and Burgdorf, {M. J.} and S. Ciceri and G. D'Ago and Evans, {D. F.} and Hinse, {T. C.} and N. Kains and E. Kerins and H. Korhonen and L. Mancini and A. Popovas and M. Rabus and S. Rahvar and G. Scarpetta and Skottfelt, {Jesper Mirsa} and J. Southworth and N. Peixinho and P. Verma and Kennea, {J. A.} and N. Gehrels and (Swift, {P G F}",

year = "2016",

month = nov,

day = "1",

doi = "10.3847/0004-637X/831/2/183",

language = "English",

volume = "831",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "Institute of Physics Publishing, Inc",

number = "2",

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TY - JOUR

T1 - The First Simultaneous Microlensing Observations by Two Space telescopes

T2 - Spitzer and Swift Reveal a Brown Dwarf in Event OGLE-2015-BLG-1319

AU - Shvartzvald, Y.

AU - Li, Z.

AU - Udalski, A.

AU - Gould, A.

AU - Sumi, T.

AU - Street, R. A.

AU - Calchi Novati, S.

AU - Hundertmark, M.

AU - Bozza, V.

AU - Beichman, C.

AU - Bryden, G.

AU - Carey, S.

AU - Drummond, J.

AU - Fausnaugh, M.

AU - Gaudi, B. S.

AU - Henderson, C. B.

AU - Tan, T. G.

AU - Wibking, B.

AU - Pogge, R. W.

AU - Yee, J. C.

AU - Zhu, W.

AU - Tsapras, Y.

AU - Bachelet, E.

AU - Dominik, M.

AU - Bramich, D. M.

AU - Cassan, A.

AU - Figuera Jaimes, R.

AU - Horne, K.

AU - Ranc, C.

AU - Schmidt, R.

AU - Snodgrass, C.

AU - Wambsganss, J.

AU - Steele, I. A.

AU - Menzies, J.

AU - Mao, S.

AU - Poleski, R.

AU - Pawlak, M.

AU - Szymański, M. K.

AU - Skowron, J.

AU - Mróz, P.

AU - Kozłowski, S.

AU - Wyrzykowski, Ł.

AU - Pietrukowicz, P.

AU - Soszyński, I.

AU - Ulaczyk, K.

AU - Abe, F.

AU - Asakura, Y.

AU - Barry, R. K.

AU - Bennett, D. P.

AU - Bhattacharya, A.

AU - Bond, I. A.

AU - Freeman, M.

AU - Hirao, Y.

AU - Itow, Y.

AU - Koshimoto, N.

AU - Li, M. C. A.

AU - Ling, C. H.

AU - Masuda, K.

AU - Fukui, A.

AU - Matsubara, Y.

AU - Muraki, Y.

AU - Nagakane, M.

AU - Nishioka, T.

AU - Ohnishi, K.

AU - Oyokawa, H.

AU - Rattenbury, N. J.

AU - Saito, To.

AU - Sharan, A.

AU - Sullivan, D. J.

AU - Suzuki, D.

AU - Tristram, P. J.

AU - Yonehara, A.

AU - (MOA Group, [Ukendt]

AU - Jørgensen, U. G.

AU - Burgdorf, M. J.

AU - Ciceri, S.

AU - D'Ago, G.

AU - Evans, D. F.

AU - Hinse, T. C.

AU - Kains, N.

AU - Kerins, E.

AU - Korhonen, H.

AU - Mancini, L.

AU - Popovas, A.

AU - Rabus, M.

AU - Rahvar, S.

AU - Scarpetta, G.

AU - Skottfelt, Jesper Mirsa

AU - Southworth, J.

AU - Peixinho, N.

AU - Verma, P.

AU - Kennea, J. A.

AU - Gehrels, N.

AU - (Swift, P G F

PY - 2016/11/1

Y1 - 2016/11/1

N2 - Simultaneous observations of microlensing events from multiple locations allow for the breaking of degeneracies between the physical properties of the lensing system, specifically by exploring different regions of the lens plane and by directly measuring the “microlens parallax.” We report the discovery of a 30-65M J brown dwarf orbiting a K dwarf in the microlensing event OGLE-2015-BLG-1319. The system is located at a distance of ˜5 kpc toward the Galactic Bulge. The event was observed by several ground-based groups as well as by Spitzer and Swift, allowing a measurement of the physical properties. However, the event is still subject to an eight-fold degeneracy, in particular the well-known close-wide degeneracy, and thus the projected separation between the two lens components is either ˜0.25 au or ˜45 au. This is the first microlensing event observed by Swift, with the UVOT camera. We study the region of microlensing parameter space to which Swift is sensitive, finding that though Swift could not measure the microlens parallax with respect to ground-based observations for this event, it can be important for other events. Specifically, it is important for detecting nearby brown dwarfs and free-floating planets in high magnification events.

AB - Simultaneous observations of microlensing events from multiple locations allow for the breaking of degeneracies between the physical properties of the lensing system, specifically by exploring different regions of the lens plane and by directly measuring the “microlens parallax.” We report the discovery of a 30-65M J brown dwarf orbiting a K dwarf in the microlensing event OGLE-2015-BLG-1319. The system is located at a distance of ˜5 kpc toward the Galactic Bulge. The event was observed by several ground-based groups as well as by Spitzer and Swift, allowing a measurement of the physical properties. However, the event is still subject to an eight-fold degeneracy, in particular the well-known close-wide degeneracy, and thus the projected separation between the two lens components is either ˜0.25 au or ˜45 au. This is the first microlensing event observed by Swift, with the UVOT camera. We study the region of microlensing parameter space to which Swift is sensitive, finding that though Swift could not measure the microlens parallax with respect to ground-based observations for this event, it can be important for other events. Specifically, it is important for detecting nearby brown dwarfs and free-floating planets in high magnification events.

KW - binaries: general

KW - brown dwarfs

KW - Galaxy: bulge

KW - gravitational lensing: micro

U2 - 10.3847/0004-637X/831/2/183

DO - 10.3847/0004-637X/831/2/183

M3 - Journal article

SN - 0004-637X

VL - 831

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2

M1 - 183

ER -

The First Simultaneous Microlensing Observations by Two Space telescopes: Spitzer and Swift Reveal a Brown Dwarf in Event OGLE-2015-BLG-1319

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Keywords

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