Two new free-floating or wide-orbit planets from microlensing

Przemek Mróz; Andrzej Udalski; David P. Bennett; Yoon Hyun Ryu; Takahiro Sumi; Yossi Shvartzvald; Jan Skowron; Radosław Poleski; Paweł Pietrukowicz; Szymon Kozłowski; Michał K. Szymański; Łukasz Wyrzykowski; Igor Soszyński; Krzysztof Ulaczyk; Krzysztof Rybicki; Patryk Iwanek; Michael D. Albrow; Sun Ju Chung; Andrew Gould; Cheongho Han; Kyu Ha Hwang; Youn Kil Jung; In Gu Shin; Jennifer C. Yee; Weicheng Zang; Sang Mok Cha; Dong Jin Kim; Hyoun Woo Kim; Seung Lee Kim; Chung Uk Lee; Dong Joo Lee; Yongseok Lee; Byeong Gon Park; Richard W. Pogge; Fumio Abe; Richard Barry; Aparna Bhattacharya; Ian A. Bond; Martin Donachie; Akihiko Fukui; Yuki Hirao; Yoshitaka Itow; Kohei Kawasaki; 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; Dan Maoz; Shai Kaspi; Matan Friedmann

doi:https://doi.org/10.1051/0004-6361/201834557

Two new free-floating or wide-orbit planets from microlensing

Przemek Mróz, Andrzej Udalski, David P. Bennett, Yoon Hyun Ryu, Takahiro Sumi, Yossi Shvartzvald, Jan Skowron, Radosław Poleski, Paweł Pietrukowicz, Szymon Kozłowski, Michał K. Szymański, Łukasz Wyrzykowski, Igor Soszyński, Krzysztof Ulaczyk, Krzysztof Rybicki, Patryk Iwanek, Michael D. Albrow, Sun Ju Chung, Andrew Gould, Cheongho HanKyu Ha Hwang, Youn Kil Jung, In Gu Shin, Jennifer C. Yee, Weicheng Zang, Sang Mok Cha, Dong Jin Kim, Hyoun Woo Kim, Seung Lee Kim, Chung Uk Lee, Dong Joo Lee, Yongseok Lee, Byeong Gon Park, Richard W. Pogge, Fumio Abe, Richard Barry, Aparna Bhattacharya, Ian A. Bond, Martin Donachie, Akihiko Fukui, Yuki Hirao, Yoshitaka Itow, Kohei Kawasaki, 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, Dan Maoz, Shai Kaspi, Matan Friedmann

School of Physics and Astronomy

Tel Aviv University

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

Abstract

Planet formation theories predict the existence of free-floating planets that have been ejected from their parent systems. Although they emit little or no light, they can be detected during gravitational microlensing events. Microlensing events caused by rogue planets are characterized by very short timescales t _E (typically below two days) and small angular Einstein radii θ _E (up to several μas). Here we present the discovery and characterization of two ultra-short microlensing events identified in data from the Optical Gravitational Lensing Experiment (OGLE) survey, which may have been caused by free-floating or wide-orbit planets. OGLE-2012-BLG-1323 is one of the shortest events discovered thus far (t _E = 0.155 ± 0.005 d, θ _E = 2.37 ± 0.10μas) and was caused by an Earth-mass object in the Galactic disk or a Neptune-mass planet in the Galactic bulge. OGLE-2017-BLG-0560 (t _E = 0.905 ± 0.005 d, θ _E = 38.7 ± 1.6μas) was caused by a Jupiter-mass planet in the Galactic disk or a brown dwarf in the bulge. We rule out stellar companions up to a distance of 6.0 and 3.9 au, respectively. We suggest that the lensing objects, whether located on very wide orbits or free-floating, may originate from the same physical mechanism. Although the sample of ultrashort microlensing events is small, these detections are consistent with low-mass wide-orbit or unbound planets being more common than stars in the Milky Way.

Original language	English
Article number	A201
Journal	Astronomy and Astrophysics
Volume	622
DOIs	https://doi.org/10.1051/0004-6361/201834557
State	Published - 1 Feb 2019

Keywords

Gravitational lensing: Micro
Planets and satellites: Detection

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

Access to Document

https://doi.org/10.1051/0004-6361/201834557

Cite this

Mróz, P., Udalski, A., Bennett, D. P., Ryu, Y. H., Sumi, T., Shvartzvald, Y., Skowron, J., Poleski, R., Pietrukowicz, P., Kozłowski, S., Szymański, M. K., Wyrzykowski, Ł., Soszyński, I., Ulaczyk, K., Rybicki, K., Iwanek, P., Albrow, M. D., Chung, S. J., Gould, A., ... Friedmann, M. (2019). Two new free-floating or wide-orbit planets from microlensing. Astronomy and Astrophysics, 622, Article A201. https://doi.org/10.1051/0004-6361/201834557

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title = "Two new free-floating or wide-orbit planets from microlensing",

abstract = " Planet formation theories predict the existence of free-floating planets that have been ejected from their parent systems. Although they emit little or no light, they can be detected during gravitational microlensing events. Microlensing events caused by rogue planets are characterized by very short timescales t E (typically below two days) and small angular Einstein radii θ E (up to several μas). Here we present the discovery and characterization of two ultra-short microlensing events identified in data from the Optical Gravitational Lensing Experiment (OGLE) survey, which may have been caused by free-floating or wide-orbit planets. OGLE-2012-BLG-1323 is one of the shortest events discovered thus far (t E = 0.155 ± 0.005 d, θ E = 2.37 ± 0.10μas) and was caused by an Earth-mass object in the Galactic disk or a Neptune-mass planet in the Galactic bulge. OGLE-2017-BLG-0560 (t E = 0.905 ± 0.005 d, θ E = 38.7 ± 1.6μas) was caused by a Jupiter-mass planet in the Galactic disk or a brown dwarf in the bulge. We rule out stellar companions up to a distance of 6.0 and 3.9 au, respectively. We suggest that the lensing objects, whether located on very wide orbits or free-floating, may originate from the same physical mechanism. Although the sample of ultrashort microlensing events is small, these detections are consistent with low-mass wide-orbit or unbound planets being more common than stars in the Milky Way.",

keywords = "Gravitational lensing: Micro, Planets and satellites: Detection",

author = "Przemek Mr{\'o}z and Andrzej Udalski and Bennett, {David P.} and Ryu, {Yoon Hyun} and Takahiro Sumi and Yossi Shvartzvald and Jan Skowron and Rados{\l}aw Poleski and Pawe{\l} Pietrukowicz and Szymon Koz{\l}owski and Szyma{\'n}ski, {Micha{\l} K.} and {\L}ukasz Wyrzykowski and Igor Soszy{\'n}ski and Krzysztof Ulaczyk and Krzysztof Rybicki and Patryk Iwanek and Albrow, {Michael D.} and Chung, {Sun Ju} and Andrew Gould and Cheongho Han and Hwang, {Kyu Ha} and Jung, {Youn Kil} and Shin, {In Gu} and Yee, {Jennifer C.} and Weicheng Zang and Cha, {Sang Mok} and Kim, {Dong Jin} and Kim, {Hyoun Woo} and Kim, {Seung Lee} and Lee, {Chung Uk} and Lee, {Dong Joo} and Yongseok Lee and Park, {Byeong Gon} and Pogge, {Richard W.} and Fumio Abe and Richard Barry and Aparna Bhattacharya and Bond, {Ian A.} and Martin Donachie and Akihiko Fukui and Yuki Hirao and Yoshitaka Itow and Kohei Kawasaki 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 Dan Maoz and Shai Kaspi and Matan Friedmann",

note = "Publisher Copyright: {\textcopyright} ESO 2019.",

year = "2019",

month = feb,

day = "1",

doi = "https://doi.org/10.1051/0004-6361/201834557",

language = "الإنجليزيّة",

volume = "622",

journal = "Astronomy and Astrophysics",

issn = "0004-6361",

publisher = "EDP Sciences",

}

Mróz, P, Udalski, A, Bennett, DP, Ryu, YH, Sumi, T, Shvartzvald, Y, Skowron, J, Poleski, R, Pietrukowicz, P, Kozłowski, S, Szymański, MK, Wyrzykowski, Ł, Soszyński, I, Ulaczyk, K, Rybicki, K, Iwanek, P, Albrow, MD, Chung, SJ, Gould, A, Han, C, Hwang, KH, Jung, YK, Shin, IG, Yee, JC, Zang, W, Cha, SM, Kim, DJ, Kim, HW, Kim, SL, Lee, CU, Lee, DJ, Lee, Y, Park, BG, Pogge, RW, Abe, F, Barry, R, Bhattacharya, A, Bond, IA, Donachie, M, Fukui, A, Hirao, Y, Itow, Y, Kawasaki, K, 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, Maoz, D, Kaspi, S & Friedmann, M 2019, 'Two new free-floating or wide-orbit planets from microlensing', Astronomy and Astrophysics, vol. 622, A201. https://doi.org/10.1051/0004-6361/201834557

TY - JOUR

T1 - Two new free-floating or wide-orbit planets from microlensing

AU - Mróz, Przemek

AU - Udalski, Andrzej

AU - Bennett, David P.

AU - Ryu, Yoon Hyun

AU - Sumi, Takahiro

AU - Shvartzvald, Yossi

AU - Skowron, Jan

AU - Poleski, Radosław

AU - Pietrukowicz, Paweł

AU - Kozłowski, Szymon

AU - Szymański, Michał K.

AU - Wyrzykowski, Łukasz

AU - Soszyński, Igor

AU - Ulaczyk, Krzysztof

AU - Rybicki, Krzysztof

AU - Iwanek, Patryk

AU - Albrow, Michael D.

AU - Chung, Sun Ju

AU - Gould, Andrew

AU - Han, Cheongho

AU - Hwang, Kyu Ha

AU - Jung, Youn Kil

AU - Shin, In Gu

AU - Yee, Jennifer C.

AU - Zang, Weicheng

AU - Cha, Sang Mok

AU - Kim, Dong Jin

AU - Kim, Hyoun Woo

AU - Kim, Seung Lee

AU - Lee, Chung Uk

AU - Lee, Dong Joo

AU - Lee, Yongseok

AU - Park, Byeong Gon

AU - Pogge, Richard W.

AU - Abe, Fumio

AU - Barry, Richard

AU - Bhattacharya, Aparna

AU - Bond, Ian A.

AU - Donachie, Martin

AU - Fukui, Akihiko

AU - Hirao, Yuki

AU - Itow, Yoshitaka

AU - Kawasaki, Kohei

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 - Maoz, Dan

AU - Kaspi, Shai

AU - Friedmann, Matan

PY - 2019/2/1

Y1 - 2019/2/1

N2 - Planet formation theories predict the existence of free-floating planets that have been ejected from their parent systems. Although they emit little or no light, they can be detected during gravitational microlensing events. Microlensing events caused by rogue planets are characterized by very short timescales t E (typically below two days) and small angular Einstein radii θ E (up to several μas). Here we present the discovery and characterization of two ultra-short microlensing events identified in data from the Optical Gravitational Lensing Experiment (OGLE) survey, which may have been caused by free-floating or wide-orbit planets. OGLE-2012-BLG-1323 is one of the shortest events discovered thus far (t E = 0.155 ± 0.005 d, θ E = 2.37 ± 0.10μas) and was caused by an Earth-mass object in the Galactic disk or a Neptune-mass planet in the Galactic bulge. OGLE-2017-BLG-0560 (t E = 0.905 ± 0.005 d, θ E = 38.7 ± 1.6μas) was caused by a Jupiter-mass planet in the Galactic disk or a brown dwarf in the bulge. We rule out stellar companions up to a distance of 6.0 and 3.9 au, respectively. We suggest that the lensing objects, whether located on very wide orbits or free-floating, may originate from the same physical mechanism. Although the sample of ultrashort microlensing events is small, these detections are consistent with low-mass wide-orbit or unbound planets being more common than stars in the Milky Way.

AB - Planet formation theories predict the existence of free-floating planets that have been ejected from their parent systems. Although they emit little or no light, they can be detected during gravitational microlensing events. Microlensing events caused by rogue planets are characterized by very short timescales t E (typically below two days) and small angular Einstein radii θ E (up to several μas). Here we present the discovery and characterization of two ultra-short microlensing events identified in data from the Optical Gravitational Lensing Experiment (OGLE) survey, which may have been caused by free-floating or wide-orbit planets. OGLE-2012-BLG-1323 is one of the shortest events discovered thus far (t E = 0.155 ± 0.005 d, θ E = 2.37 ± 0.10μas) and was caused by an Earth-mass object in the Galactic disk or a Neptune-mass planet in the Galactic bulge. OGLE-2017-BLG-0560 (t E = 0.905 ± 0.005 d, θ E = 38.7 ± 1.6μas) was caused by a Jupiter-mass planet in the Galactic disk or a brown dwarf in the bulge. We rule out stellar companions up to a distance of 6.0 and 3.9 au, respectively. We suggest that the lensing objects, whether located on very wide orbits or free-floating, may originate from the same physical mechanism. Although the sample of ultrashort microlensing events is small, these detections are consistent with low-mass wide-orbit or unbound planets being more common than stars in the Milky Way.

KW - Gravitational lensing: Micro

KW - Planets and satellites: Detection

UR - http://www.scopus.com/inward/record.url?scp=85062188567&partnerID=8YFLogxK

U2 - https://doi.org/10.1051/0004-6361/201834557

DO - https://doi.org/10.1051/0004-6361/201834557

M3 - مقالة

SN - 0004-6361

VL - 622

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

M1 - A201

ER -

Two new free-floating or wide-orbit planets from microlensing

Abstract

Keywords

All Science Journal Classification (ASJC) codes

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