Spitzer microlensing parallax reveals two isolated stars in the Galactic bulge

Weicheng Zang; Yossi Shvartzvald; Tianshu Wang; Andrzej Udalski; Chung-Uk Lee; Takahiro Sumi; Jesper Skottfelt; Shun-Sheng Li; Shude Mao; Wei Zhu; Jennifer C. Yee; Sebastiano Calchi Novati; Charles A. Beichman; Geoffery Bryden; Sean Carey; B. Scott Gaudi; Calen B. Henderson; Przemek Mróz; Jan Skowron; Radoslaw Poleski; Michał K. Szymański; Igor Soszyński; Paweł Pietrukowicz; Szymon Kozłowski; Krzysztof Ulaczyk; Krzysztof A. Rybicki; Patryk Iwanek; Etienne Bachelet; Grant Christie; Jonathan Green; Steve Hennerley; Dan Maoz; Tim Natusch; Richard W. Pogge; Rachel A. Street; Yiannis Tsapras; Michael D. Albrow; Sun-Ju Chung; Andrew Gould; Cheongho Han; Kyu-Ha Hwang; Youn Kil Jung; Yoon-Hyun Ryu; In-Gu Shin; Sang-Mok Cha; Dong-Jin Kim; Hyoun-Woo Kim; Seung-Lee Kim; Dong-Joo Lee; Yongseok Lee; Byeong-Gon Park; Richard W. Pogge; Ian A. Bond; Fumio Abe; Richard Barry; David P. Bennett; Aparna Bhattacharya; Martin Donachie; Akihiko Fukui; Yuki Hirao; Yoshitaka Itow; Iona Kondo; Naoki Koshimoto; Man Cheung Alex Li; Yutaka Matsubara; Yasushi Muraki; Shota Miyazaki; Masayuki Nagakane; Clément Ranc; Nicholas J. Rattenbury; Haruno Suematsu; Denis J. Sullivan; Daisuke Suzuki; Paul J. Tristram; Atsunori Yonehara; Martin Dominik; Markus Hundertmark; Uffe G. Jørgensen; Sohrab Rahvar; Sedighe Sajadian; Colin Snodgrass; Valerio Bozza; Martin J. Burgdorf; Daniel F. Evans; Roberto Figuera Jaimes; Yuri I. Fujii; Luigi Mancini; Penelope Longa-Peña; Christiane Helling; Nuno Peixinho; Markus Rabus; John Southworth; Eduardo Unda-Sanzana; Carolina von Essen

doi:10.3847/1538-4357/ab6ff8

Spitzer microlensing parallax reveals two isolated stars in the Galactic bulge

Weicheng Zang^*
, Yossi Shvartzvald
, Tianshu Wang
, Andrzej Udalski
, Chung-Uk Lee
, Takahiro Sumi
, Jesper Skottfelt
, Shun-Sheng Li
, Shude Mao
, Wei Zhu
, Jennifer C. Yee
, Sebastiano Calchi Novati
, Charles A. Beichman
, Geoffery Bryden
, Sean Carey
, B. Scott Gaudi
, Calen B. Henderson
, Przemek Mróz
, Jan Skowron
, Radoslaw Poleski

Michał K. Szymański, Igor Soszyński, Paweł Pietrukowicz, Szymon Kozłowski, Krzysztof Ulaczyk, Krzysztof A. Rybicki, Patryk Iwanek, Etienne Bachelet, Grant Christie, Jonathan Green, Steve Hennerley, Dan Maoz, Tim Natusch, Richard W. Pogge, Rachel A. Street, Yiannis Tsapras, Michael D. Albrow, Sun-Ju Chung, Andrew Gould, Cheongho Han, Kyu-Ha Hwang, Youn Kil Jung, Yoon-Hyun Ryu, In-Gu Shin, Sang-Mok Cha, Dong-Jin Kim, Hyoun-Woo Kim, Seung-Lee Kim, Dong-Joo Lee, Yongseok Lee, Byeong-Gon Park, Richard W. Pogge, Ian A. Bond, Fumio Abe, Richard Barry, David P. Bennett, Aparna Bhattacharya, Martin Donachie, Akihiko Fukui, Yuki Hirao, Yoshitaka Itow, Iona Kondo, Naoki Koshimoto, Man Cheung Alex Li, Yutaka Matsubara, Yasushi Muraki, Shota Miyazaki, Masayuki Nagakane, Clément Ranc, Nicholas J. Rattenbury, Haruno Suematsu, Denis J. Sullivan, Daisuke Suzuki, Paul J. Tristram, Atsunori Yonehara, Martin Dominik, Markus Hundertmark, Uffe G. Jørgensen, Sohrab Rahvar, Sedighe Sajadian, Colin Snodgrass, Valerio Bozza, Martin J. Burgdorf, Daniel F. Evans, Roberto Figuera Jaimes, Yuri I. Fujii, Luigi Mancini, Penelope Longa-Peña, Christiane Helling, Nuno Peixinho, Markus Rabus, John Southworth, Eduardo Unda-Sanzana, Carolina von Essen

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

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.

Original language	English
Article number	3
Number of pages	11
Journal	Astrophysical Journal
Volume	891
Issue number	1
Early online date	27 Feb 2020
DOIs	https://doi.org/10.3847/1538-4357/ab6ff8
Publication status	Published - 1 Mar 2020

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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., ... von Essen, C. (2020). Spitzer microlensing parallax reveals two isolated stars in the Galactic bulge. Astrophysical Journal, 891(1), Article 3. https://doi.org/10.3847/1538-4357/ab6ff8

@article{927e61e619a7400dbf4c68e4f5ade131,

title = "Spitzer microlensing parallax reveals two isolated stars in the Galactic bulge",

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.",

author = "Weicheng Zang and Yossi Shvartzvald and Tianshu Wang and Andrzej Udalski and Chung-Uk Lee and Takahiro Sumi and Jesper Skottfelt and Shun-Sheng Li and Shude Mao and Wei Zhu and Yee, \{Jennifer C.\} and \{Calchi Novati\}, Sebastiano and Beichman, \{Charles A.\} and Geoffery Bryden and Sean Carey and Gaudi, \{B. Scott\} and Henderson, \{Calen B.\} and Przemek Mr{\'o}z and Jan Skowron and Radoslaw Poleski and Szyma{\'n}ski, \{Micha{\l} K.\} and Igor Soszy{\'n}ski and Pawe{\l} Pietrukowicz and Szymon Koz{\l}owski and Krzysztof Ulaczyk and Rybicki, \{Krzysztof A.\} and Patryk Iwanek and Etienne Bachelet and Grant Christie and Jonathan Green and Steve Hennerley and Dan Maoz and Tim Natusch and Pogge, \{Richard W.\} and Street, \{Rachel A.\} and Yiannis Tsapras and Albrow, \{Michael D.\} and Sun-Ju Chung and Andrew Gould and Cheongho Han and Kyu-Ha Hwang and Jung, \{Youn Kil\} and Yoon-Hyun Ryu and In-Gu Shin and Sang-Mok Cha and Dong-Jin Kim and Hyoun-Woo Kim and Seung-Lee Kim and Dong-Joo Lee and Yongseok Lee and Byeong-Gon Park and Pogge, \{Richard W.\} and Bond, \{Ian A.\} and Fumio Abe and Richard Barry and Bennett, \{David P.\} and Aparna Bhattacharya and Martin Donachie and Akihiko Fukui and Yuki Hirao and Yoshitaka Itow and Iona Kondo and Naoki Koshimoto and Li, \{Man Cheung Alex\} and Yutaka Matsubara and Yasushi Muraki and Shota Miyazaki and Masayuki Nagakane and Cl{\'e}ment Ranc and Rattenbury, \{Nicholas J.\} and Haruno Suematsu and Sullivan, \{Denis J.\} and Daisuke Suzuki and Tristram, \{Paul J.\} and Atsunori Yonehara and Martin Dominik and Markus Hundertmark and J{\o}rgensen, \{Uffe G.\} and Sohrab Rahvar and Sedighe Sajadian and Colin Snodgrass and Valerio Bozza and Burgdorf, \{Martin J.\} and Evans, \{Daniel F.\} and \{Figuera Jaimes\}, Roberto and Fujii, \{Yuri I.\} and Luigi Mancini and Penelope Longa-Pe{\~n}a and Christiane Helling and Nuno Peixinho and Markus Rabus and John Southworth and Eduardo Unda-Sanzana and \{von Essen\}, Carolina",

year = "2020",

month = mar,

day = "1",

doi = "10.3847/1538-4357/ab6ff8",

language = "English",

volume = "891",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "American Astronomical Society",

number = "1",

}

Zang, W, Shvartzvald, Y, Wang, T, Udalski, A, Lee, C-U, Sumi, T, Skottfelt, J, Li, S-S, Mao, S, Zhu, W, Yee, JC, Calchi Novati, S, Beichman, CA, Bryden, G, Carey, S, Gaudi, BS, Henderson, CB, Mróz, P, Skowron, J, Poleski, R, Szymański, MK, Soszyński, I, Pietrukowicz, P, Kozłowski, S, Ulaczyk, K, Rybicki, KA, Iwanek, P, Bachelet, E, Christie, G, Green, J, Hennerley, S, Maoz, D, Natusch, T, Pogge, RW, Street, RA, Tsapras, Y, Albrow, MD, Chung, S-J, Gould, A, Han, C, Hwang, K-H, Jung, YK, 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, RW, Bond, IA, Abe, F, Barry, R, Bennett, DP, Bhattacharya, A, Donachie, M, Fukui, A, Hirao, Y, Itow, Y, Kondo, I, Koshimoto, N, Li, MCA, Matsubara, Y, Muraki, Y, Miyazaki, S, Nagakane, M, Ranc, C, Rattenbury, NJ, Suematsu, H, Sullivan, DJ, Suzuki, D, Tristram, PJ, Yonehara, A, Dominik, M, Hundertmark, M, Jørgensen, UG, Rahvar, S, Sajadian, S, Snodgrass, C, Bozza, V, Burgdorf, MJ, Evans, DF, Figuera Jaimes, R, Fujii, YI, 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

TY - JOUR

T1 - Spitzer microlensing parallax reveals two isolated stars in the Galactic bulge

AU - Zang, Weicheng

AU - Shvartzvald, Yossi

AU - Wang, Tianshu

AU - Udalski, Andrzej

AU - Lee, Chung-Uk

AU - Sumi, Takahiro

AU - Skottfelt, Jesper

AU - Li, Shun-Sheng

AU - Mao, Shude

AU - Zhu, Wei

AU - Yee, Jennifer C.

AU - Calchi Novati, Sebastiano

AU - Beichman, Charles A.

AU - Bryden, Geoffery

AU - Carey, Sean

AU - Gaudi, B. Scott

AU - Henderson, Calen B.

AU - Mróz, Przemek

AU - Skowron, Jan

AU - Poleski, Radoslaw

AU - Szymański, Michał K.

AU - Soszyński, Igor

AU - Pietrukowicz, Paweł

AU - Kozłowski, Szymon

AU - Ulaczyk, Krzysztof

AU - Rybicki, Krzysztof A.

AU - Iwanek, Patryk

AU - Bachelet, Etienne

AU - Christie, Grant

AU - Green, Jonathan

AU - Hennerley, Steve

AU - Maoz, Dan

AU - Natusch, Tim

AU - Pogge, Richard W.

AU - Street, Rachel A.

AU - Tsapras, Yiannis

AU - Albrow, Michael D.

AU - Chung, Sun-Ju

AU - Gould, Andrew

AU - Han, Cheongho

AU - Hwang, Kyu-Ha

AU - Jung, Youn Kil

AU - Ryu, Yoon-Hyun

AU - Shin, In-Gu

AU - Cha, Sang-Mok

AU - Kim, Dong-Jin

AU - Kim, Hyoun-Woo

AU - Kim, Seung-Lee

AU - Lee, Dong-Joo

AU - Lee, Yongseok

AU - Park, Byeong-Gon

AU - Pogge, Richard W.

AU - Bond, Ian A.

AU - Abe, Fumio

AU - Barry, Richard

AU - Bennett, David P.

AU - Bhattacharya, Aparna

AU - Donachie, Martin

AU - Fukui, Akihiko

AU - Hirao, Yuki

AU - Itow, Yoshitaka

AU - Kondo, Iona

AU - Koshimoto, Naoki

AU - Li, Man Cheung Alex

AU - Matsubara, Yutaka

AU - Muraki, Yasushi

AU - Miyazaki, Shota

AU - Nagakane, Masayuki

AU - Ranc, Clément

AU - Rattenbury, Nicholas J.

AU - Suematsu, Haruno

AU - Sullivan, Denis J.

AU - Suzuki, Daisuke

AU - Tristram, Paul J.

AU - Yonehara, Atsunori

AU - Dominik, Martin

AU - Hundertmark, Markus

AU - Jørgensen, Uffe G.

AU - Rahvar, Sohrab

AU - Sajadian, Sedighe

AU - Snodgrass, Colin

AU - Bozza, Valerio

AU - Burgdorf, Martin J.

AU - Evans, Daniel F.

AU - Figuera Jaimes, Roberto

AU - Fujii, Yuri I.

AU - Mancini, Luigi

AU - Longa-Peña, Penelope

AU - Helling, Christiane

AU - Peixinho, Nuno

AU - Rabus, Markus

AU - Southworth, John

AU - Unda-Sanzana, Eduardo

AU - von Essen, Carolina

PY - 2020/3/1

Y1 - 2020/3/1

N2 - 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.

AB - 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.

U2 - 10.3847/1538-4357/ab6ff8

DO - 10.3847/1538-4357/ab6ff8

M3 - Article

SN - 0004-637X

VL - 891

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1

M1 - 3

ER -

Spitzer microlensing parallax reveals two isolated stars in the Galactic bulge

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