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; J. Skottfelt; M. I. Andersen; M. J. Burgdorf; S. Ciceri; G. D'Ago; D. F. Evans; S.-H. Gu; T. C. Hinse; 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

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, J. Skottfelt, M. I. Andersen, M. J. Burgdorf, S. Ciceri, G. D'Ago, D. F. Evans, S.-H. Gu, T. C. Hinse, 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

School of Physics and Astronomy

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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_jup }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_sun 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
Number of pages	10
Journal	Astrophysical Journal
Volume	825
Issue number	1
DOIs	https://doi.org/10.3847/0004-637X/825/1/60
Publication status	Published - 27 Jun 2016

Keywords

Brown dwarfs
Gravitational lensing: micro
Stars: fundamental parameters

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

apj_825_1_60
© 2016, American Astronomical Society. This work is made available online in accordance with the publisher’s policies. This is the final published version of the work, which was originally published at iopscience.iop.org / https://dx.doi.org/10.3847/0004-637X/825/1/60
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http://adsabs.harvard.edu/abs/2016ApJ...825...60Z

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

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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., ... Wertz, O. (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

@article{8e39eafca0374733b586d15c1d261f9d,

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_jup }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_sun 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 J. Skottfelt and Andersen, {M. I.} and Burgdorf, {M. J.} and S. Ciceri and G. D'Ago and Evans, {D. F.} and S.-H. Gu and Hinse, {T. C.} 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",

year = "2016",

month = jun,

day = "27",

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

language = "English",

volume = "825",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "American Astronomical Society",

number = "1",

}

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, Skottfelt, J, Andersen, MI, Burgdorf, MJ, Ciceri, S, D'Ago, G, Evans, DF, Gu, S-H, Hinse, TC, 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 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

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 - Skottfelt, J.

AU - Andersen, M. I.

AU - Burgdorf, M. J.

AU - Ciceri, S.

AU - D'Ago, G.

AU - Evans, D. F.

AU - Gu, S.-H.

AU - Hinse, T. C.

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.

PY - 2016/6/27

Y1 - 2016/6/27

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_jup }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_sun 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_jup }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_sun 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 - 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

Abstract

Keywords

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

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