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; 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. J rgensen; Sohrab Rahvar; Sedighe Sajadian; Colin Snodgrass; Valerio Bozza; Martin J. Burgdorf; Daniel F. Evans; R. Figuera Jaimes; Yuri I. Fujii; Luigi Mancini; Penelope Longa-Pe&ntilde;a; 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 PoleskiMichał 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, 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. J rgensen, Sohrab Rahvar, Sedighe Sajadian, Colin Snodgrass, Valerio Bozza, Martin J. Burgdorf, Daniel F. Evans, R. Figuera Jaimes, Yuri I. Fujii, Luigi Mancini, Penelope Longa-Peña, Christiane Helling, Nuno Peixinho, Markus Rabus, John Southworth, Eduardo Unda-Sanzana, Carolina Von Essen

School of Physics and Astronomy

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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 _o 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 star with D _LS = 0.40 0.12 kpc or a 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
Journal	Astrophysical Journal
Volume	891
Issue number	1
DOIs	https://doi.org/10.3847/1538-4357/ab6ff8
State	Published - 1 Mar 2020

Funding

Funders	Funder number
National Science Foundation	1516842, 1500811
National Science Foundation

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10.3847/1538-4357/ab6ff8

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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., ... Essen, C. V. (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{1cb01fdc079141fc9698da4f401ba864,

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 o 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 star with D LS = 0.40 0.12 kpc or a 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 Lee, {Chung Uk} and Takahiro Sumi and Jesper Skottfelt and Li, {Shun Sheng} 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 Chung, {Sun Ju} and Andrew Gould and Cheongho Han and Hwang, {Kyu Ha} and Jung, {Youn Kil} and Ryu, {Yoon Hyun} and Shin, {In Gu} and Cha, {Sang Mok} and Kim, {Dong Jin} and Kim, {Hyoun Woo} and Kim, {Seung Lee} and Lee, {Dong Joo} and Yongseok Lee and Park, {Byeong Gon} 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 {Alex Li}, {Man Cheung} 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 rgensen}, {Uffe G.} and Sohrab Rahvar and Sedighe Sajadian and Colin Snodgrass and Valerio Bozza and Burgdorf, {Martin J.} and Evans, {Daniel F.} and Jaimes, {R. Figuera} and Fujii, {Yuri I.} and Luigi Mancini and Penelope Longa-Peña and Christiane Helling and Nuno Peixinho and Markus Rabus and John Southworth and Eduardo Unda-Sanzana and Essen, {Carolina Von}",

year = "2020",

month = mar,

day = "1",

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

language = "אנגלית",

volume = "891",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "IOP Publishing Ltd.",

number = "1",

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Zang, W, Shvartzvald, Y, Wang, T, Udalski, A, Lee, CU, Sumi, T, Skottfelt, J, Li, SS, 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, SJ, Gould, A, Han, C, Hwang, KH, Jung, YK, Ryu, YH, Shin, IG, Cha, SM, Kim, DJ, Kim, HW, Kim, SL, Lee, DJ, Lee, Y, Park, BG, Bond, IA, Abe, F, Barry, R, Bennett, DP, Bhattacharya, A, Donachie, M, Fukui, A, Hirao, Y, Itow, Y, Kondo, I, Koshimoto, N, Alex Li, MC, 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, J rgensen, UG, Rahvar, S, Sajadian, S, Snodgrass, C, Bozza, V, Burgdorf, MJ, Evans, DF, Jaimes, RF, Fujii, YI, Mancini, L, Longa-Peña, P, Helling, C, Peixinho, N, Rabus, M, Southworth, J, Unda-Sanzana, E & Essen, CV 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 - 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 - Alex Li, Man Cheung

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 - J rgensen, Uffe G.

AU - Rahvar, Sohrab

AU - Sajadian, Sedighe

AU - Snodgrass, Colin

AU - Bozza, Valerio

AU - Burgdorf, Martin J.

AU - Evans, Daniel F.

AU - Jaimes, R. Figuera

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 - Essen, Carolina Von

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 o 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 star with D LS = 0.40 0.12 kpc or a 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 o 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 star with D LS = 0.40 0.12 kpc or a 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.

UR - http://www.scopus.com/inward/record.url?scp=85084645720&partnerID=8YFLogxK

U2 - 10.3847/1538-4357/ab6ff8

DO - 10.3847/1538-4357/ab6ff8

M3 - ???researchoutput.researchoutputtypes.contributiontojournal.article???

AN - SCOPUS:85084645720

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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