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Mass measurements of isolated objects from space-based microlensing

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Date
27/06/2016
Author
Zhu, Wei
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.
Pawlak, M.
Szymański, M. K.
Skowron, J.
Mróz, P.
Kozłowski, S.
Wyrzykowski, Ł.
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
Figuera Jaimes, R.
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.
von Essen, C.
Wang, Y.-B.
Wertz, O.
Funder
Science & Technology Facilities Council
Grant ID
ST/M001296/1
Keywords
Brown dwarfs
Gravitational lensing: micro
Stars: fundamental parameters
QB Astronomy
QC Physics
NDAS
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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.
Citation
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 , Pawlak , M , Szymański , M K , Skowron , J , Mróz , P , Kozłowski , S , Wyrzykowski , Ł , 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 , S , Figuera Jaimes , R , 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 , 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
Publication
Astrophysical Journal
Status
Peer reviewed
DOI
https://doi.org/10.3847/0004-637X/825/1/60
ISSN
0004-637X
Type
Journal article
Rights
© 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
Collections
  • University of St Andrews Research
URL
http://adsabs.harvard.edu/abs/2016ApJ...825...60Z
URI
http://hdl.handle.net/10023/9185

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