干旱区生态环境知识资源中心(Arid): KMT-2017-BLG-2820 and the Nature of the Free-floating Planet Population

Arid

DOI	10.3847/1538-3881/abd55f
	KMT-2017-BLG-2820 and the Nature of the Free-floating Planet Population
	Ryu, Yoon-Hyun; Mroz, Przemek; Gould, Andrew; Hwang, Kyu-Ha; Kim, Hyoun-Woo; Yee, Jennifer C.; Albrow, Michael D.; Chung, Sun-Ju; Jung, Youn Kil; Shin, In-Gu; Shvartzvald, Yossi; Zang, Weicheng; Cha, Sang-Mok; Kim, Dong-Jin; Kim, Seung-Lee; Lee, Chung-Uk; Lee, Dong-Joo; Lee, Yongseok; Park, Byeong-Gon; Han, Cheongho; Pogge, Richard W.; Udalski, Andrzej; Poleski, Radek; Skowron, Jan; Szymanski, Michal K.; Soszynski, Igor; Pietrukowicz, Pawel; Kozlowski, Szymon; Ulaczyk, Krzysztof; Rybicki, Krzysztof A.; Iwanek, Patryk
通讯作者	Ryu, YH (corresponding author), Korea Astron & Space Sci Inst, Daejon 34055, South Korea.
来源期刊	ASTRONOMICAL JOURNAL
ISSN	0004-6256
EISSN	1538-3881
出版年	2021
卷号	161 期号:3
英文摘要	We report a new free-floating planet (FFP) candidate, KMT-2017-BLG-2820, with Einstein radius theta(E) similar or equal to 6 mu as, lens-source relative proper motion mu(rel) similar or equal to 8 mas yr(-1), and Einstein timescale t(E) = 6.5 hr. It is the third FFP candidate found in an ongoing study of giant-source finite-source point-lens (FSPL) events in the KMTNet database and the sixth FSPL FFP candidate overall. We find no significant evidence for a host. Based on their timescale distributions and detection rates, we argue that five of these six FSPL FFP candidates are drawn from the same population as the six point-source point-lens (PSPL) FFP candidates found by Mroz et al. in the OGLE-IV database. The theta(E) distribution of the FSPL FFPs implies that they are either sub-Jovian planets in the bulge or super-Earths in the disk. However, the apparent Einstein desert (10 less than or similar to theta(E)/mu as less than or similar to 30) would argue for the latter. Whether each of the 12 (six FSPL and six PSPL) FFP candidates is truly an FFP or simply a very wide-separation planet can be determined at first adaptive optics (AO) light on 30 m telescopes, and earlier for some. If the latter, a second epoch of AO observations could measure the projected planet-host separation with a precision of O(10 au). At the present time, the balance of evidence favors the unbound-planet hypothesis.
类型	Article
语种	英语
开放获取类型	Green Submitted, Green Accepted
收录类别	SCI-E
WOS记录号	WOS:000619782400001
WOS关键词	GRAVITATIONAL LENSING EXPERIMENT ; MICROLENSING EVENTS ; GAS GIANTS ; OGLE-III ; MASS ; SYSTEMS ; BULGE ; EXTINCTION ; PHOTOMETRY ; NETWORK
WOS类目	Astronomy & Astrophysics
WOS研究方向	Astronomy & Astrophysics
来源机构	清华大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/349598
作者单位	[Ryu, Yoon-Hyun; Hwang, Kyu-Ha; Chung, Sun-Ju; Jung, Youn Kil; Shin, In-Gu; Cha, Sang-Mok; Kim, Dong-Jin; Kim, Seung-Lee; Lee, Chung-Uk; Lee, Dong-Joo; Lee, Yongseok; Park, Byeong-Gon] Korea Astron & Space Sci Inst, Daejon 34055, South Korea; [Mroz, Przemek] CALTECH, Div Phys Math & Astron, Pasadena, CA 91125 USA; [Gould, Andrew] Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany; [Gould, Andrew; Pogge, Richard W.] Ohio State Univ, Dept Astron, 140 W 18th Ave, Columbus, OH 43210 USA; [Kim, Hyoun-Woo] Chungbuk Natl Univ, Dept Astron & Space Sci, Cheongju 28644, South Korea; [Yee, Jennifer C.] Harvard & Smithsonian, Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA; [Albrow, Michael D.] Univ Canterbury, Dept Phys & Astron, Private Bag 4800, Christchurch 8020, New Zealand; [Chung, Sun-Ju; Kim, Seung-Lee; Lee, Chung-Uk; Park, Byeong-Gon] Korea Univ Sci & Technol, UST, 217 Gajeong Ro, Daejeon 34113, South Korea; [Shvartzvald, Yossi] CALTECH, IPAC, Mail Code 100-22,1200 E Calif Blvd, Pasadena...
推荐引用方式 GB/T 7714	Ryu, Yoon-Hyun,Mroz, Przemek,Gould, Andrew,et al. KMT-2017-BLG-2820 and the Nature of the Free-floating Planet Population[J]. 清华大学,2021,161(3).
APA	Ryu, Yoon-Hyun.,Mroz, Przemek.,Gould, Andrew.,Hwang, Kyu-Ha.,Kim, Hyoun-Woo.,...&Iwanek, Patryk.(2021).KMT-2017-BLG-2820 and the Nature of the Free-floating Planet Population.ASTRONOMICAL JOURNAL,161(3).
MLA	Ryu, Yoon-Hyun,et al."KMT-2017-BLG-2820 and the Nature of the Free-floating Planet Population".ASTRONOMICAL JOURNAL 161.3(2021).