Mass Measurements of Isolated Objects from Space-based Microlensing

Wei Zhu; S. Calchi Novati; A. Gould; A. Udalski; C. Han; Y. Shvartzvald; C. Ranc; U. G. Jørgensen; R. Poleski; V. Bozza; C. Beichman; G. Bryden; S. Carey; B. S. Gaudi; C. B. Henderson; R. W. Pogge; I. Porritt; B. Wibking; J. C. Yee; M. Pawlak; M. K. Szymański; J. Skowron; P. Mróz; S. Kozłowski; Ł. Wyrzykowski; P. Pietrukowicz; G. Pietrzyński; I. Soszyński; K. Ulaczyk; J.-Y. Choi; H. Park; Y. K. Jung; I.-G. Shin; M. D. Albrow; B.-G. Park; S.-L. Kim; C.-U. Lee; S.-M. Cha; D.-J. Kim; Y. Lee; M. Friedmann; S. Kaspi; D. Maoz; M. Hundertmark; R. A. Street; Y. Tsapras; D. M. Bramich; A. Cassan; M. Dominik; E. Bachelet; Subo Dong; R. Figuera Jaimes; K. Horne; S. Mao; J. Menzies; R. Schmidt; C. Snodgrass; I. A. Steele; J. Wambsganss; null RoboNeT Team; Jesper Mirsa Skottfelt; Michael Ingemann Andersen; M. J. Burgdorf; S. Ciceri; G. D'Ago; D. F. Evans; E. Kerins; H. Korhonen; M. Kuffmeier; L. Mancini; N. Peixinho; A. Popovas; M. Rabus; S. Rahvar; R. Tronsgaard; G. Scarpetta; J. Southworth; J. Surdej; C. von Essen; Y.-B. Wang; O. Wertz; null MiNDSTEP Group

doi:10.3847/0004-637X/825/1/60

Mass Measurements of Isolated Objects from Space-based Microlensing

Wei Zhu, S. Calchi Novati, A. Gould, A. Udalski, C. Han, Y. Shvartzvald, C. Ranc, U. G. Jørgensen, R. Poleski, V. Bozza, C. Beichman, G. Bryden, S. Carey, B. S. Gaudi, C. B. Henderson, R. W. Pogge, I. Porritt, B. Wibking, J. C. Yee, M. PawlakM. K. Szymański, J. Skowron, P. Mróz, S. Kozłowski, Ł. Wyrzykowski, P. Pietrukowicz, G. Pietrzyński, I. Soszyński, K. Ulaczyk, J.-Y. Choi, H. Park, Y. K. Jung, I.-G. Shin, M. D. Albrow, B.-G. Park, S.-L. Kim, C.-U. Lee, S.-M. Cha, D.-J. Kim, Y. Lee, M. Friedmann, S. Kaspi, D. Maoz, M. Hundertmark, R. A. Street, Y. Tsapras, D. M. Bramich, A. Cassan, M. Dominik, E. Bachelet, Subo Dong, R. Figuera Jaimes, K. Horne, S. Mao, J. Menzies, R. Schmidt, C. Snodgrass, I. A. Steele, J. Wambsganss, RoboNeT Team, Jesper Mirsa Skottfelt, Michael Ingemann Andersen, M. J. Burgdorf, S. Ciceri, G. D'Ago, D. F. Evans, E. Kerins, H. Korhonen, M. Kuffmeier, L. Mancini, N. Peixinho, A. Popovas, M. Rabus, S. Rahvar, R. Tronsgaard, G. Scarpetta, J. Southworth, J. Surdej, C. von Essen, Y.-B. Wang, O. Wertz, MiNDSTEP Group

31 Citations (Scopus)

Abstract

We report on the mass and distance measurements of two single-lens events from the 2015 Spitzer microlensing campaign. With both finite-source effect and microlens parallax measurements, we find that the lens of OGLE-2015-BLG-1268 is very likely a brown dwarf (BD). Assuming that the source star lies behind the same amount of dust as the Bulge red clump, we find the lens is a 45 ± 7 {M}{{J}} BD at 5.9 ± 1.0 kpc. The lens of of the second event, OGLE-2015-BLG-0763, is a 0.50 ± 0.04 {M}⊙ star at 6.9 ± 1.0 kpc. We show that the probability to definitively measure the mass of isolated microlenses is dramatically increased once simultaneous ground- and space-based observations are conducted.

Original language	English
Article number	60
Journal	Astrophysical Journal
Volume	825
Issue number	1
ISSN	0004-637X
DOIs	https://doi.org/10.3847/0004-637X/825/1/60
Publication status	Published - 1 Jul 2016

Keywords

brown dwarfs
gravitational lensing: micro
stars: fundamental parameters

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Zhu, W., Calchi Novati, S., Gould, A., Udalski, A., Han, C., Shvartzvald, Y., Ranc, C., Jørgensen, U. G., Poleski, R., Bozza, V., Beichman, C., Bryden, G., Carey, S., Gaudi, B. S., Henderson, C. B., Pogge, R. W., Porritt, I., Wibking, B., Yee, J. C., ... MiNDSTEP Group (2016). Mass Measurements of Isolated Objects from Space-based Microlensing. Astrophysical Journal, 825(1), Article 60. https://doi.org/10.3847/0004-637X/825/1/60

Zhu, W, Calchi Novati, S, Gould, A, Udalski, A, Han, C, Shvartzvald, Y, Ranc, C, Jørgensen, UG, Poleski, R, Bozza, V, Beichman, C, Bryden, G, Carey, S, Gaudi, BS, Henderson, CB, Pogge, RW, Porritt, I, Wibking, B, Yee, JC, Pawlak, M, Szymański, MK, Skowron, J, Mróz, P, Kozłowski, S, Wyrzykowski, Ł, Pietrukowicz, P, Pietrzyński, G, Soszyński, I, Ulaczyk, K, Choi, J-Y, Park, H, Jung, YK, Shin, I-G, Albrow, MD, Park, B-G, Kim, S-L, Lee, C-U, Cha, S-M, Kim, D-J, Lee, Y, Friedmann, M, Kaspi, S, Maoz, D, Hundertmark, M, Street, RA, Tsapras, Y, Bramich, DM, Cassan, A, Dominik, M, Bachelet, E, Dong, S, Figuera Jaimes, R, Horne, K, Mao, S, Menzies, J, Schmidt, R, Snodgrass, C, Steele, IA, Wambsganss, J, RoboNeT Team, Skottfelt, JM, Andersen, MI, Burgdorf, MJ, Ciceri, S, D'Ago, G, Evans, DF, Kerins, E, Korhonen, H, Kuffmeier, M, Mancini, L, Peixinho, N, Popovas, A, Rabus, M, Rahvar, S, Tronsgaard, R, Scarpetta, G, Southworth, J, Surdej, J, von Essen, C, Wang, Y-B, Wertz, O & MiNDSTEP Group 2016, 'Mass Measurements of Isolated Objects from Space-based Microlensing', Astrophysical Journal, vol. 825, no. 1, 60. https://doi.org/10.3847/0004-637X/825/1/60

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title = "Mass Measurements of Isolated Objects from Space-based Microlensing",

abstract = "We report on the mass and distance measurements of two single-lens events from the 2015 Spitzer microlensing campaign. With both finite-source effect and microlens parallax measurements, we find that the lens of OGLE-2015-BLG-1268 is very likely a brown dwarf (BD). Assuming that the source star lies behind the same amount of dust as the Bulge red clump, we find the lens is a 45 ± 7 {M}{{J}} BD at 5.9 ± 1.0 kpc. The lens of of the second event, OGLE-2015-BLG-0763, is a 0.50 ± 0.04 {M}⊙ star at 6.9 ± 1.0 kpc. We show that the probability to definitively measure the mass of isolated microlenses is dramatically increased once simultaneous ground- and space-based observations are conducted.",

keywords = "brown dwarfs, gravitational lensing: micro, stars: fundamental parameters",

author = "Wei Zhu and {Calchi Novati}, S. and A. Gould and A. Udalski and C. Han and Y. Shvartzvald and C. Ranc and J{\o}rgensen, {U. G.} and R. Poleski and V. Bozza and C. Beichman and G. Bryden and S. Carey and Gaudi, {B. S.} and Henderson, {C. B.} and Pogge, {R. W.} and I. Porritt and B. Wibking and Yee, {J. C.} 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 G. Pietrzy{\'n}ski and I. Soszy{\'n}ski and K. Ulaczyk and J.-Y. Choi and H. Park and Jung, {Y. K.} and I.-G. Shin and Albrow, {M. D.} and B.-G. Park and S.-L. Kim and C.-U. Lee and S.-M. Cha and D.-J. Kim and Y. Lee and M. Friedmann and S. Kaspi and D. Maoz and M. Hundertmark and Street, {R. A.} and Y. Tsapras and Bramich, {D. M.} and A. Cassan and M. Dominik and E. Bachelet and Subo Dong and {Figuera Jaimes}, R. and K. Horne and S. Mao and J. Menzies and R. Schmidt and C. Snodgrass and Steele, {I. A.} and J. Wambsganss and {RoboNeT Team} and Skottfelt, {Jesper Mirsa} and Andersen, {Michael Ingemann} and Burgdorf, {M. J.} and S. Ciceri and G. D'Ago and Evans, {D. F.} and E. Kerins and H. Korhonen and M. Kuffmeier and L. Mancini and N. Peixinho and A. Popovas and M. Rabus and S. Rahvar and R. Tronsgaard and G. Scarpetta and J. Southworth and J. Surdej and {von Essen}, C. and Y.-B. Wang and O. Wertz and {MiNDSTEP Group}",

year = "2016",

month = jul,

day = "1",

doi = "10.3847/0004-637X/825/1/60",

language = "English",

volume = "825",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "Institute of Physics Publishing, Inc",

number = "1",

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TY - JOUR

T1 - Mass Measurements of Isolated Objects from Space-based Microlensing

AU - Zhu, Wei

AU - Calchi Novati, S.

AU - Gould, A.

AU - Udalski, A.

AU - Han, C.

AU - Shvartzvald, Y.

AU - Ranc, C.

AU - Jørgensen, U. G.

AU - Poleski, R.

AU - Bozza, V.

AU - Beichman, C.

AU - Bryden, G.

AU - Carey, S.

AU - Gaudi, B. S.

AU - Henderson, C. B.

AU - Pogge, R. W.

AU - Porritt, I.

AU - Wibking, B.

AU - Yee, J. C.

AU - Pawlak, M.

AU - Szymański, M. K.

AU - Skowron, J.

AU - Mróz, P.

AU - Kozłowski, S.

AU - Wyrzykowski, Ł.

AU - Pietrukowicz, P.

AU - Pietrzyński, G.

AU - Soszyński, I.

AU - Ulaczyk, K.

AU - Choi, J.-Y.

AU - Park, H.

AU - Jung, Y. K.

AU - Shin, I.-G.

AU - Albrow, M. D.

AU - Park, B.-G.

AU - Kim, S.-L.

AU - Lee, C.-U.

AU - Cha, S.-M.

AU - Kim, D.-J.

AU - Lee, Y.

AU - Friedmann, M.

AU - Kaspi, S.

AU - Maoz, D.

AU - Hundertmark, M.

AU - Street, R. A.

AU - Tsapras, Y.

AU - Bramich, D. M.

AU - Cassan, A.

AU - Dominik, M.

AU - Bachelet, E.

AU - Dong, Subo

AU - Figuera Jaimes, R.

AU - Horne, K.

AU - Mao, S.

AU - Menzies, J.

AU - Schmidt, R.

AU - Snodgrass, C.

AU - Steele, I. A.

AU - Wambsganss, J.

AU - RoboNeT Team, null

AU - Skottfelt, Jesper Mirsa

AU - Andersen, Michael Ingemann

AU - Burgdorf, M. J.

AU - Ciceri, S.

AU - D'Ago, G.

AU - Evans, D. F.

AU - Kerins, E.

AU - Korhonen, H.

AU - Kuffmeier, M.

AU - Mancini, L.

AU - Peixinho, N.

AU - Popovas, A.

AU - Rabus, M.

AU - Rahvar, S.

AU - Tronsgaard, R.

AU - Scarpetta, G.

AU - Southworth, J.

AU - Surdej, J.

AU - von Essen, C.

AU - Wang, Y.-B.

AU - Wertz, O.

AU - MiNDSTEP Group, null

PY - 2016/7/1

Y1 - 2016/7/1

N2 - We report on the mass and distance measurements of two single-lens events from the 2015 Spitzer microlensing campaign. With both finite-source effect and microlens parallax measurements, we find that the lens of OGLE-2015-BLG-1268 is very likely a brown dwarf (BD). Assuming that the source star lies behind the same amount of dust as the Bulge red clump, we find the lens is a 45 ± 7 {M}{{J}} BD at 5.9 ± 1.0 kpc. The lens of of the second event, OGLE-2015-BLG-0763, is a 0.50 ± 0.04 {M}⊙ star at 6.9 ± 1.0 kpc. We show that the probability to definitively measure the mass of isolated microlenses is dramatically increased once simultaneous ground- and space-based observations are conducted.

AB - We report on the mass and distance measurements of two single-lens events from the 2015 Spitzer microlensing campaign. With both finite-source effect and microlens parallax measurements, we find that the lens of OGLE-2015-BLG-1268 is very likely a brown dwarf (BD). Assuming that the source star lies behind the same amount of dust as the Bulge red clump, we find the lens is a 45 ± 7 {M}{{J}} BD at 5.9 ± 1.0 kpc. The lens of of the second event, OGLE-2015-BLG-0763, is a 0.50 ± 0.04 {M}⊙ star at 6.9 ± 1.0 kpc. We show that the probability to definitively measure the mass of isolated microlenses is dramatically increased once simultaneous ground- and space-based observations are conducted.

KW - brown dwarfs

KW - gravitational lensing: micro

KW - stars: fundamental parameters

U2 - 10.3847/0004-637X/825/1/60

DO - 10.3847/0004-637X/825/1/60

M3 - Journal article

SN - 0004-637X

VL - 825

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1

M1 - 60

ER -

Mass Measurements of Isolated Objects from Space-based Microlensing

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Keywords

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