Spitzer Microlensing parallax reveals two isolated stars in the Galactic bulge

the MiNDSTEp Collaboration

doi:10.3847/1538-4357/ab6ff8

Spitzer Microlensing parallax reveals two isolated stars in the Galactic bulge

the MiNDSTEp Collaboration

School of Physics and Astronomy

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

Abstract / Description of output

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 0:600:03M star with DLS = 0:530:11 kpc, where DLS 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+0:12 􀀀0:10M star with DLS = 0:40 0:12 kpc or a 0:38+0:13 􀀀0:12M star with DLS = 0:530:19 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
occurrence in single lens events.

Original language	English
Journal	Astrophysical Journal
Volume	891
Issue number	1
DOIs	https://doi.org/10.3847/1538-4357/ab6ff8
Publication status	Published - 27 Feb 2020

Keywords / Materials (for Non-textual outputs)

astro-ph.SR

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10.3847/1538-4357/ab6ff8

1904.11204Accepted author manuscript, 806 KB

https://iopscience.iop.org/article/10.3847/1538-4357/ab6ff8

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@article{6de0fd31537d4b648b6b288e0c339da5,

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 0:600:03M star with DLS = 0:530:11 kpc, where DLS is the distance between the lens and the source. The second event, OGLE-2017-BLG-1161, is subject to the known satelliteparallax degeneracy, and thus is either a 0:51+0:12 􀀀0:10M star with DLS = 0:40 0:12 kpc or a 0:38+0:13 􀀀0:12M star with DLS = 0:530:19 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 effectsoccurrence in single lens events.",

keywords = "astro-ph.SR",

author = "{the MiNDSTEp Collaboration} and 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 Novati, {Sebastiano Calchi} 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 Colin Snodgrass",

note = "16 pages, 6 Figures. Submitted to AAS journal",

year = "2020",

month = feb,

day = "27",

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

language = "English",

volume = "891",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "IOP Publishing",

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TY - JOUR

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

AU - the MiNDSTEp Collaboration

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 - Novati, Sebastiano Calchi

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 - Snodgrass, Colin

N1 - 16 pages, 6 Figures. Submitted to AAS journal

PY - 2020/2/27

Y1 - 2020/2/27

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 0:600:03M star with DLS = 0:530:11 kpc, where DLS is the distance between the lens and the source. The second event, OGLE-2017-BLG-1161, is subject to the known satelliteparallax degeneracy, and thus is either a 0:51+0:12 􀀀0:10M star with DLS = 0:40 0:12 kpc or a 0:38+0:13 􀀀0:12M star with DLS = 0:530:19 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 effectsoccurrence 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 0:600:03M star with DLS = 0:530:11 kpc, where DLS is the distance between the lens and the source. The second event, OGLE-2017-BLG-1161, is subject to the known satelliteparallax degeneracy, and thus is either a 0:51+0:12 􀀀0:10M star with DLS = 0:40 0:12 kpc or a 0:38+0:13 􀀀0:12M star with DLS = 0:530:19 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 effectsoccurrence in single lens events.

KW - astro-ph.SR

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

ER -

Spitzer Microlensing parallax reveals two isolated stars in the Galactic bulge

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