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Spitzer microlensing parallax reveals two isolated stars in the Galactic bulge

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Zang_2020_ApJ_891_3.pdf (2.180Mb)
Date
01/03/2020
Author
Zang, Weicheng
Shvartzvald, Yossi
Wang, Tianshu
Udalski, Andrzej
Lee, Chung-Uk
Sumi, Takahiro
Skottfelt, Jesper
Li, Shun-Sheng
Mao, Shude
Zhu, Wei
Yee, Jennifer C.
Calchi Novati, Sebastiano
Beichman, Charles A.
Bryden, Geoffery
Carey, Sean
Gaudi, B. Scott
Henderson, Calen B.
Mróz, Przemek
Skowron, Jan
Poleski, Radoslaw
Szymański, Michał K.
Soszyński, Igor
Pietrukowicz, Paweł
Kozłowski, Szymon
Ulaczyk, Krzysztof
Rybicki, Krzysztof A.
Iwanek, Patryk
Bachelet, Etienne
Christie, Grant
Green, Jonathan
Hennerley, Steve
Maoz, Dan
Natusch, Tim
Pogge, Richard W.
Street, Rachel A.
Tsapras, Yiannis
Albrow, Michael D.
Chung, Sun-Ju
Gould, Andrew
Han, Cheongho
Hwang, Kyu-Ha
Jung, Youn Kil
Ryu, Yoon-Hyun
Shin, In-Gu
Cha, Sang-Mok
Kim, Dong-Jin
Kim, Hyoun-Woo
Kim, Seung-Lee
Lee, Dong-Joo
Lee, Yongseok
Park, Byeong-Gon
Pogge, Richard W.
Bond, Ian A.
Abe, Fumio
Barry, Richard
Bennett, David P.
Bhattacharya, Aparna
Donachie, Martin
Fukui, Akihiko
Hirao, Yuki
Itow, Yoshitaka
Kondo, Iona
Koshimoto, Naoki
Li, Man Cheung Alex
Matsubara, Yutaka
Muraki, Yasushi
Miyazaki, Shota
Nagakane, Masayuki
Ranc, Clément
Rattenbury, Nicholas J.
Suematsu, Haruno
Sullivan, Denis J.
Suzuki, Daisuke
Tristram, Paul J.
Yonehara, Atsunori
Dominik, Martin
Hundertmark, Markus
Jørgensen, Uffe G.
Rahvar, Sohrab
Sajadian, Sedighe
Snodgrass, Colin
Bozza, Valerio
Burgdorf, Martin J.
Evans, Daniel F.
Figuera Jaimes, Roberto
Fujii, Yuri I.
Mancini, Luigi
Longa-Peña, Penelope
Helling, Christiane
Peixinho, Nuno
Rabus, Markus
Southworth, John
Unda-Sanzana, Eduardo
von Essen, Carolina
Keywords
QB Astronomy
QC Physics
DAS
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Abstract
We report the mass and distance measurements of two single-lens events from the 2017 Spitzer microlensing campaign. The ground-based observations yield the detection of finite-source effects, and the microlens parallaxes are derived from the joint analysis of ground-based observations and Spitzer observations. We find that the lens of OGLE-2017-BLG-1254 is a 0.60 ± 0.03 M ⊙ star with D LS = 0.53 ± 0.11 kpc, where D LS is the distance between the lens and the source. The second event, OGLE-2017-BLG-1161, is subject to the known satellite parallax degeneracy, and thus is either a 0.51-0.10+0.12 M⊙ star with D LS = 0.40 ± 0.12 kpc or a 0.38-0.12+0.13 M⊙ star with D LS = 0.53 ± 0.19 kpc. Both of the lenses are therefore isolated stars in the Galactic bulge. By comparing the mass and distance distributions of the eight published Spitzer finite-source events with the expectations from a Galactic model, we find that the Spitzer sample is in agreement with the probability of finite-source effects occurring in single-lens events.
Citation
Zang , W , Shvartzvald , Y , Wang , T , Udalski , A , Lee , C-U , Sumi , T , Skottfelt , J , Li , S-S , Mao , S , Zhu , W , Yee , J C , Calchi Novati , S , Beichman , C A , Bryden , G , Carey , S , Gaudi , B S , Henderson , C B , Mróz , P , Skowron , J , Poleski , R , Szymański , M K , Soszyński , I , Pietrukowicz , P , Kozłowski , S , Ulaczyk , K , Rybicki , K A , Iwanek , P , Bachelet , E , Christie , G , Green , J , Hennerley , S , Maoz , D , Natusch , T , Pogge , R W , Street , R A , Tsapras , Y , Albrow , M D , Chung , S-J , Gould , A , Han , C , Hwang , K-H , Jung , Y K , Ryu , Y-H , Shin , I-G , Cha , S-M , Kim , D-J , Kim , H-W , Kim , S-L , Lee , D-J , Lee , Y , Park , B-G , Pogge , R W , Bond , I A , Abe , F , Barry , R , Bennett , D P , Bhattacharya , A , Donachie , M , Fukui , A , Hirao , Y , Itow , Y , Kondo , I , Koshimoto , N , Li , M C A , Matsubara , Y , Muraki , Y , Miyazaki , S , Nagakane , M , Ranc , C , Rattenbury , N J , Suematsu , H , Sullivan , D J , Suzuki , D , Tristram , P J , Yonehara , A , Dominik , M , Hundertmark , M , Jørgensen , U G , Rahvar , S , Sajadian , S , Snodgrass , C , Bozza , V , Burgdorf , M J , Evans , D F , Figuera Jaimes , R , Fujii , Y I , Mancini , L , Longa-Peña , P , Helling , C , Peixinho , N , Rabus , M , Southworth , J , Unda-Sanzana , E & von Essen , C 2020 , ' Spitzer microlensing parallax reveals two isolated stars in the Galactic bulge ' , Astrophysical Journal , vol. 891 , no. 1 , 3 . https://doi.org/10.3847/1538-4357/ab6ff8
Publication
Astrophysical Journal
Status
Peer reviewed
DOI
https://doi.org/10.3847/1538-4357/ab6ff8
ISSN
0004-637X
Type
Journal article
Rights
Copyright © 2020 American Astronomical Society. All rights reserved. This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the final published version of the work, which was originally published at https://doi.org/10.3847/1538-4357/ab6ff8
Collections
  • University of St Andrews Research
URL
http://adsabs.harvard.edu/abs/2019arXiv190411204Z
URI
http://hdl.handle.net/10023/19630

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