Spitzer Microlensing Parallax Reveals Two Isolated Stars in the Galactic Bulge
Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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Spitzer Microlensing Parallax Reveals Two Isolated Stars in the Galactic Bulge. / 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.; Novati, Sebastiano Calchi; Beichman, Charles A.; Bryden, Geoffery; Carey, Sean; Gaudi, B. Scott; Henderson, Calen B.; Mroz, Przemek; Skowron, Jan; Poleski, Radoslaw; Szymanski, Michal K.; Soszynski, Igor; Pietrukowicz, Pawel; Kozowski, 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; Jorgensen, Uffe G.; Spitzer Team; OGLE Collaboration; LCO Follow-Up Team; FUN Follow-Up Team; KMTNet Collaboration; MOA Collaboration; MiNDSTEp Collaboration.
I: Astrophysical Journal, Bind 891, Nr. 1, 3, 01.03.2020.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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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 - Novati, Sebastiano Calchi
AU - Beichman, Charles A.
AU - Bryden, Geoffery
AU - Carey, Sean
AU - Gaudi, B. Scott
AU - Henderson, Calen B.
AU - Mroz, Przemek
AU - Skowron, Jan
AU - Poleski, Radoslaw
AU - Szymanski, Michal K.
AU - Soszynski, Igor
AU - Pietrukowicz, Pawel
AU - Kozowski, 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 - Jorgensen, Uffe G.
AU - Spitzer Team
AU - OGLE Collaboration
AU - LCO Follow-Up Team
AU - FUN Follow-Up Team
AU - KMTNet Collaboration
AU - MOA Collaboration
AU - MiNDSTEp Collaboration
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-circle dot 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-circle dot star with D-LS = 0.40 +/- 0.12 kpc or a 0.38(-0.12)(+0.13) M-circle dot 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-circle dot 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-circle dot star with D-LS = 0.40 +/- 0.12 kpc or a 0.38(-0.12)(+0.13) M-circle dot 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.
KW - MASS
KW - PHOTOMETRY
KW - STELLAR
KW - EVENTS
KW - SYSTEMS
KW - SEARCH
KW - SIZES
U2 - 10.3847/1538-4357/ab6ff8
DO - 10.3847/1538-4357/ab6ff8
M3 - Journal article
VL - 891
JO - Astrophysical Journal
JF - Astrophysical Journal
SN - 0004-637X
IS - 1
M1 - 3
ER -
ID: 247168279