OGLE-2014-BLG-0221Lb: A Jupiter Mass Ratio Companion Orbiting Either a Late-type Star or a Stellar Remnant

Kirikawa, Rintaro; Sumi, Takahiro; Bennett, David P.; Suzuki, Daisuke; Koshimoto, Naoki; Miyazaki, Shota; Bond, Ian A.; Udalski, Andrzej; Rattenbury, Nicholas J.; Abe, Fumio; Barry, Richard; Bhattacharya, Aparna; Fujii, Hirosane; Fukui, Akihiko; Hamada, Ryusei; Hirao, Yuki; Silva, Stela Ishitani; Itow, Yoshitaka; Matsubara, Yutaka; Muraki, Yasushi; Olmschenk, Greg; Ranc, Clément; Satoh, Yuki K.; Tomoyoshi, Mio; Tristram, Paul J.; Vandorou, Aikaterini; Yama, Hibiki; Yamashita, Kansuke; Mróz, Przemek; Poleski, Radosław; Skowron, Jan; Szymański, Michał K.; Soszyński, Igor; Pietrukowicz, Paweł; Kozłowski, Szymon; Ulaczyk, Krzysztof; Mróz, Mateusz J.

doi:https://doi.org/10.3847/1538-3881/ad2703

OGLE-2014-BLG-0221Lb: A Jupiter Mass Ratio Companion Orbiting Either a Late-type Star or a Stellar Remnant

Kirikawa, Rintaro; Sumi, Takahiro; Bennett, David P. et al.

Astronomical Journal, 2024, 167(4), 154

Number of Access:2,133（2025-08-23 21:59 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/95646

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Title	OGLE-2014-BLG-0221Lb: A Jupiter Mass Ratio Companion Orbiting Either a Late-type Star or a Stellar Remnant
Creator	CreatorName Kirikawa, Rintaro
	NRID 1000030432214 1000030432214 researchmap permalink read0139558 read0139558 Scopus Author ID 55573890400 55573890400 CreatorName Sumi, Takahiro
	CreatorName Bennett, David P.
	NRID 1000060807717 1000060807717 ORCID 0000-0002-5843-9433 0000-0002-5843-9433 researchmap permalink dsuzuki0214 dsuzuki0214 Scopus Author ID 55702463200 55702463200 CreatorName Suzuki, Daisuke
	NRID 1000090829566 1000090829566 researchmap permalink nkoshimoto nkoshimoto CreatorName Koshimoto, Naoki
	NRID 1000010975973 1000010975973 CreatorName Miyazaki, Shota
	CreatorName Bond, Ian A.
	CreatorName Udalski, Andrzej
	CreatorName Rattenbury, Nicholas J.
	NRID 1000080184224 1000080184224 CreatorName Abe, Fumio
	CreatorName Barry, Richard
	CreatorName Bhattacharya, Aparna
	CreatorName Fujii, Hirosane
	NRID 1000060632049 1000060632049 CreatorName Fukui, Akihiko
	CreatorName Hamada, Ryusei
	CreatorName Hirao, Yuki
	CreatorName Silva, Stela Ishitani
	NRID 1000050272521 1000050272521 CreatorName Itow, Yoshitaka
	NRID 1000080202323 1000080202323 CreatorName Matsubara, Yutaka
	NRID 1000070013430 1000070013430 CreatorName Muraki, Yasushi
	CreatorName Olmschenk, Greg
	CreatorName Ranc, Clément
	CreatorName Satoh, Yuki K.
	CreatorName Tomoyoshi, Mio
	CreatorName Tristram, Paul J.
	CreatorName Vandorou, Aikaterini
	CreatorName Yama, Hibiki
	CreatorName Yamashita, Kansuke
	CreatorName Mróz, Przemek
	CreatorName Poleski, Radosław
	CreatorName Skowron, Jan
	CreatorName Szymański, Michał K.
	CreatorName Soszyński, Igor
	CreatorName Pietrukowicz, Paweł
	CreatorName Kozłowski, Szymon
	CreatorName Ulaczyk, Krzysztof
	CreatorName Mróz, Mateusz J.
Description	Kirikawa R., Sumi T., Bennett D.P., et al. OGLE-2014-BLG-0221Lb: A Jupiter Mass Ratio Companion Orbiting Either a Late-type Star or a Stellar Remnant. Astronomical Journal 167, 154 (2024); https://doi.org/10.3847/1538-3881/ad2703.
Abstract	We present the analysis of the microlensing event OGLE-2014-BLG-0221, a planetary candidate event discovered in 2014. The photometric light curve is best described by a binary-lens single-source model. Our light-curve modeling finds two degenerate models, with event timescales of t E ∼ 70 days and ∼110 days. These timescales are relatively long, indicating that the discovered system would possess a substantial mass. The two models are similar in their planetary parameters with a Jupiter mass ratio of q ∼ 10−3 and a separation of s ∼ 1.1. Bayesian inference is used to estimate the physical parameters of the lens, revealing that the shorter timescale model predicts 65% and 25% probabilities of a late-type star and white dwarf host, respectively, while the longer timescale model favors a black hole host with a probability ranging from 60% to 95%, under the assumption that stars and stellar remnants have equal probabilities of hosting companions with planetary mass ratios. If the lens is a remnant, this would be the second planet found by microlensing around a stellar remnant. The current separation between the source and lens stars is 41-139 mas depending on the models. This indicates the event is now ready for high-angular-resolution follow-up observations to rule out either of the models. If precise astrometric measurements are conducted in multiple bands, the centroid shift due to the color difference between the source and lens would be detected in the luminous lens scenario.
Publisher	American Astronomical Society
Source Title	Astronomical Journal
Volume (Issue)	167(4)
Page	154
Date of Issued	2024-04-01
Language	English
Handle URL	https://hdl.handle.net/11094/95646
PISSN	00046256
Relation.isIdenticalTo	DOI (Publisher Version) https://doi.org/10.3847/1538-3881/ad2703
Access Rights	open access
CopyRight	This article is licensed under a Creative Commons Attribution 4.0 International License.
oaire:version	Version of Record
Category	学術雑誌論文 Journal Article

Resource Type	journal article
Local Type	Journal Article
DCMI Type	Text
DCTERMS.bibliographicCitation	Astronomical Journal. 2024, 167(4), p. 154
DC.title	OGLE-2014-BLG-0221Lb: A Jupiter Mass Ratio Companion Orbiting Either a Late-type Star or a Stellar Remnant
DC.creator	Kirikawa, Rintaro
	Sumi, Takahiro
	Bennett, David P.
	Suzuki, Daisuke
	Koshimoto, Naoki
	Miyazaki, Shota
	Bond, Ian A.
	Udalski, Andrzej
	Rattenbury, Nicholas J.
	Abe, Fumio
	Barry, Richard
	Bhattacharya, Aparna
	Fujii, Hirosane
	Fukui, Akihiko
	Hamada, Ryusei
	Hirao, Yuki
	Silva, Stela Ishitani
	Itow, Yoshitaka
	Matsubara, Yutaka
	Muraki, Yasushi
	Olmschenk, Greg
	Ranc, Clément
	Satoh, Yuki K.
	Tomoyoshi, Mio
	Tristram, Paul J.
	Vandorou, Aikaterini
	Yama, Hibiki
	Yamashita, Kansuke
	Mróz, Przemek
	Poleski, Radosław
	Skowron, Jan
	Szymański, Michał K.
	Soszyński, Igor
	Pietrukowicz, Paweł
	Kozłowski, Szymon
	Ulaczyk, Krzysztof
	Mróz, Mateusz J.
DC.publisher	American Astronomical Society
DC.language' scheme='DCTERMS.RFC1766	English
DC.type' scheme='DCTERMS.DCMIType	Text
DCTERMS.issued' scheme='DCTERMS.W3CDTF	2024-04-01
DC.identifier	https://doi.org/10.3847/1538-3881/ad2703
DC.description	Kirikawa R., Sumi T., Bennett D.P., et al. OGLE-2014-BLG-0221Lb: A Jupiter Mass Ratio Companion Orbiting Either a Late-type Star or a Stellar Remnant. Astronomical Journal 167, 154 (2024); https://doi.org/10.3847/1538-3881/ad2703.
DCTERMS.abstract	We present the analysis of the microlensing event OGLE-2014-BLG-0221, a planetary candidate event discovered in 2014. The photometric light curve is best described by a binary-lens single-source model. Our light-curve modeling finds two degenerate models, with event timescales of t E ∼ 70 days and ∼110 days. These timescales are relatively long, indicating that the discovered system would possess a substantial mass. The two models are similar in their planetary parameters with a Jupiter mass ratio of q ∼ 10−3 and a separation of s ∼ 1.1. Bayesian inference is used to estimate the physical parameters of the lens, revealing that the shorter timescale model predicts 65% and 25% probabilities of a late-type star and white dwarf host, respectively, while the longer timescale model favors a black hole host with a probability ranging from 60% to 95%, under the assumption that stars and stellar remnants have equal probabilities of hosting companions with planetary mass ratios. If the lens is a remnant, this would be the second planet found by microlensing around a stellar remnant. The current separation between the source and lens stars is 41-139 mas depending on the models. This indicates the event is now ready for high-angular-resolution follow-up observations to rule out either of the models. If precise astrometric measurements are conducted in multiple bands, the centroid shift due to the color difference between the source and lens would be detected in the luminous lens scenario.
DC.rights	This article is licensed under a Creative Commons Attribution 4.0 International License.
DC.format	95646
citation_title	OGLE-2014-BLG-0221Lb: A Jupiter Mass Ratio Companion Orbiting Either a Late-type Star or a Stellar Remnant
citation_author	Kirikawa, Rintaro
	Sumi, Takahiro
	Bennett, David P.
	Suzuki, Daisuke
	Koshimoto, Naoki
	Miyazaki, Shota
	Bond, Ian A.
	Udalski, Andrzej
	Rattenbury, Nicholas J.
	Abe, Fumio
	Barry, Richard
	Bhattacharya, Aparna
	Fujii, Hirosane
	Fukui, Akihiko
	Hamada, Ryusei
	Hirao, Yuki
	Silva, Stela Ishitani
	Itow, Yoshitaka
	Matsubara, Yutaka
	Muraki, Yasushi
	Olmschenk, Greg
	Ranc, Clément
	Satoh, Yuki K.
	Tomoyoshi, Mio
	Tristram, Paul J.
	Vandorou, Aikaterini
	Yama, Hibiki
	Yamashita, Kansuke
	Mróz, Przemek
	Poleski, Radosław
	Skowron, Jan
	Szymański, Michał K.
	Soszyński, Igor
	Pietrukowicz, Paweł
	Kozłowski, Szymon
	Ulaczyk, Krzysztof
	Mróz, Mateusz J.
citation_publisher	American Astronomical Society
citation_language	English
citation_date	2024-04-01
citation_journal_title	Astronomical Journal
citation_volume	167
citation_issue	4
citation_firstpage	154
citation_doi	https://doi.org/10.3847/1538-3881/ad2703
citation_public_url	https://hdl.handle.net/11094/95646

OGLE-2014-BLG-0221Lb: A Jupiter Mass Ratio Companion Orbiting Either a Late-type Star or a Stellar Remnant

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