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. Jorgensen, 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, 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

Research output: Contribution to journalArticle

23 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 BD at 5.9 ±1.0 kpc. The lens of of the second event, OGLE-2015-BLG-0763, is a 0.50 ±0.04 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 languageEnglish
Article number60
JournalAstrophysical Journal
Volume825
Issue number1
DOIs
Publication statusPublished - 1 Jul 2016

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lenses
dust
stars
parallax
clumps
effect

Keywords

  • brown dwarfs
  • gravitational lensing: micro
  • stars: fundamental parameters

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Zhu, W., Calchi Novati, S., Gould, A., Udalski, A., Han, C., Shvartzvald, Y., ... Wertz, O. (2016). MASS MEASUREMENTS of ISOLATED OBJECTS from SPACE-BASED MICROLENSING. Astrophysical Journal, 825(1), [60]. https://doi.org/10.3847/0004-637X/825/1/60

MASS MEASUREMENTS of ISOLATED OBJECTS from SPACE-BASED MICROLENSING. / Zhu, Wei; Calchi Novati, S.; Gould, A.; Udalski, A.; Han, C.; Shvartzvald, Y.; Ranc, C.; Jorgensen, 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.; Pawlak, M.; Szymański, M. K.; Skowron, J.; Mróz, P.; Kozłowski, S.; Wyrzykowski; Pietrukowicz, P.; Pietrzyński, G.; Soszyński, I.; Ulaczyk, K.; Choi, J. Y.; Park, H.; Jung, Y. K.; Shin, I. G.; Albrow, M. D.; 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, R. A.; Tsapras, Y.; Bramich, D. M.; Cassan, A.; Dominik, M.; Bachelet, E.; Dong, Subo; Jaimes, R. Figuera; Horne, K.; Mao, S.; Menzies, J.; Schmidt, R.; Snodgrass, C.; Steele, I. A.; Wambsganss, J.; Skottfelt, J.; Andersen, M. I.; Burgdorf, M. J.; Ciceri, S.; D'Ago, G.; Evans, D. F.; Gu, S. H.; Hinse, T. C.; Kerins, E.; Korhonen, H.; Kuffmeier, M.; Mancini, L.; Peixinho, N.; Popovas, A.; Rabus, M.; Rahvar, S.; Tronsgaard, R.; Scarpetta, G.; Southworth, J.; Surdej, J.; Essen, C. Von; Wang, Y. B.; Wertz, O.

In: Astrophysical Journal, Vol. 825, No. 1, 60, 01.07.2016.

Research output: Contribution to journalArticle

Zhu, W, Calchi Novati, S, Gould, A, Udalski, A, Han, C, Shvartzvald, Y, Ranc, C, Jorgensen, 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, Pietrukowicz, P, Pietrzyński, G, Soszyński, I, Ulaczyk, K, Choi, JY, Park, H, Jung, YK, Shin, IG, Albrow, MD, Park, BG, Kim, SL, Lee, CU, Cha, SM, Kim, DJ, Lee, Y, Friedmann, M, Kaspi, S, Maoz, D, Hundertmark, M, Street, RA, Tsapras, Y, Bramich, DM, Cassan, A, Dominik, M, Bachelet, E, Dong, S, Jaimes, RF, 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, SH, 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, Essen, CV, Wang, YB & 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
Zhu W, Calchi Novati S, Gould A, Udalski A, Han C, Shvartzvald Y et al. MASS MEASUREMENTS of ISOLATED OBJECTS from SPACE-BASED MICROLENSING. Astrophysical Journal. 2016 Jul 1;825(1). 60. https://doi.org/10.3847/0004-637X/825/1/60
Zhu, Wei ; Calchi Novati, S. ; Gould, A. ; Udalski, A. ; Han, C. ; Shvartzvald, Y. ; Ranc, C. ; Jorgensen, 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. ; Pawlak, M. ; Szymański, M. K. ; Skowron, J. ; Mróz, P. ; Kozłowski, S. ; Wyrzykowski ; Pietrukowicz, P. ; Pietrzyński, G. ; Soszyński, I. ; Ulaczyk, K. ; Choi, J. Y. ; Park, H. ; Jung, Y. K. ; Shin, I. G. ; Albrow, M. D. ; 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, R. A. ; Tsapras, Y. ; Bramich, D. M. ; Cassan, A. ; Dominik, M. ; Bachelet, E. ; Dong, Subo ; Jaimes, R. Figuera ; Horne, K. ; Mao, S. ; Menzies, J. ; Schmidt, R. ; Snodgrass, C. ; Steele, I. A. ; Wambsganss, J. ; Skottfelt, J. ; Andersen, M. I. ; Burgdorf, M. J. ; Ciceri, S. ; D'Ago, G. ; Evans, D. F. ; Gu, S. H. ; Hinse, T. C. ; Kerins, E. ; Korhonen, H. ; Kuffmeier, M. ; Mancini, L. ; Peixinho, N. ; Popovas, A. ; Rabus, M. ; Rahvar, S. ; Tronsgaard, R. ; Scarpetta, G. ; Southworth, J. ; Surdej, J. ; Essen, C. Von ; Wang, Y. B. ; Wertz, O. / MASS MEASUREMENTS of ISOLATED OBJECTS from SPACE-BASED MICROLENSING. In: Astrophysical Journal. 2016 ; Vol. 825, No. 1.
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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 - Jorgensen, 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,

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 - Jaimes, R. Figuera

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 - Essen, C. Von

AU - Wang, Y. B.

AU - Wertz, O.

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 BD at 5.9 ±1.0 kpc. The lens of of the second event, OGLE-2015-BLG-0763, is a 0.50 ±0.04 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 BD at 5.9 ±1.0 kpc. The lens of of the second event, OGLE-2015-BLG-0763, is a 0.50 ±0.04 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

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