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

アクセス数:2,323件（2025-12-06 01:44 集計）

固定URL: https://hdl.handle.net/11094/95646

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タイトル	OGLE-2014-BLG-0221Lb: A Jupiter Mass Ratio Companion Orbiting Either a Late-type Star or a Stellar Remnant
著者	著者名 Kirikawa, Rintaro
	NRID 1000030432214 1000030432214 researchmap permalink read0139558 read0139558 Scopus Author ID 55573890400 55573890400 著者名 Sumi, Takahiro
	著者名 Bennett, David P.
	NRID 1000060807717 1000060807717 ORCID 0000-0002-5843-9433 0000-0002-5843-9433 researchmap permalink dsuzuki0214 dsuzuki0214 Scopus Author ID 55702463200 55702463200 著者名 Suzuki, Daisuke
	NRID 1000090829566 1000090829566 researchmap permalink nkoshimoto nkoshimoto 著者名 Koshimoto, Naoki
	NRID 1000010975973 1000010975973 著者名 Miyazaki, Shota
	著者名 Bond, Ian A.
	著者名 Udalski, Andrzej
	著者名 Rattenbury, Nicholas J.
	NRID 1000080184224 1000080184224 著者名 Abe, Fumio
	著者名 Barry, Richard
	著者名 Bhattacharya, Aparna
	著者名 Fujii, Hirosane
	NRID 1000060632049 1000060632049 著者名 Fukui, Akihiko
	著者名 Hamada, Ryusei
	著者名 Hirao, Yuki
	著者名 Silva, Stela Ishitani
	NRID 1000050272521 1000050272521 著者名 Itow, Yoshitaka
	NRID 1000080202323 1000080202323 著者名 Matsubara, Yutaka
	NRID 1000070013430 1000070013430 著者名 Muraki, Yasushi
	著者名 Olmschenk, Greg
	著者名 Ranc, Clément
	著者名 Satoh, Yuki K.
	著者名 Tomoyoshi, Mio
	著者名 Tristram, Paul J.
	著者名 Vandorou, Aikaterini
	著者名 Yama, Hibiki
	著者名 Yamashita, Kansuke
	著者名 Mróz, Przemek
	著者名 Poleski, Radosław
	著者名 Skowron, Jan
	著者名 Szymański, Michał K.
	著者名 Soszyński, Igor
	著者名 Pietrukowicz, Paweł
	著者名 Kozłowski, Szymon
	著者名 Ulaczyk, Krzysztof
	著者名 Mróz, Mateusz J.
内容	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.
抄録	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.
出版者	American Astronomical Society
収録物名	Astronomical Journal
巻(号)	167(4)
ページ	154
刊行年月	2024-04-01
言語	英語
ハンドルURL	https://hdl.handle.net/11094/95646
PISSN	00046256
関連情報 (isIdenticalTo)	DOI (出版社版) https://doi.org/10.3847/1538-3881/ad2703
アクセス権	open access
権利情報	This article is licensed under a Creative Commons Attribution 4.0 International License.
出版タイプ	Version of Record
カテゴリ	学術雑誌論文 Journal Article

資源タイプ	学術雑誌論文
ローカル資源タイプ	学術雑誌論文
DCMI資源タイプ	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	英語
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	英語
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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