WISEA J083011.95+283716.0: A Missing Link Planetary-mass Object

被引：23

作者：

Gagliuffi, Daniella C. Bardalez ^{[1
]}

Faherty, Jacqueline K. ^{[1
]}

Schneider, Adam C. ^{[2
]}

Meisner, Aaron ^{[3
]}

Caselden, Dan ^{[4
]}

Colin, Guilluame ^{[4
]}

Goodman, Sam ^{[4
]}

Kirkpatrick, J. Davy ^{[5
]}

Kuchner, Marc J. ^{[6
]}

Gagne, Jonathan ^{[7
]}

Logsdon, Sarah E. ^{[8
]}

Burgasser, Adam J. ^{[9
]}

Allers, Katelyn ^{[10
]}

Debes, John ^{[11
]}

Wisniewski, John ^{[12
]}

Rothermich, Austin ^{[13
]}

Andersen, Nikolaj Stevnbak ^{[14
]}

Thevenot, Melina ^{[4
]}

Walla, Jim ^{[4
]}

机构：

[1] Amer Museum Nat Hist, 200 Cent Pk West, New York, NY 10024 USA

[2] Arizona State Univ, Sch Earth & Space Explorat, 781 Terrace Mall, Tempe, AZ 85287 USA

[3] NSFs Natl Opt Infrared Astron Res Lab, 950 N Cherry Ave, Tucson, AZ 85719 USA

[4] Backyard Worlds Planet 9, Washington, DC USA

[5] CALTECH, IPAC, Mail Code 100-22,1200 E Calif Blvd, Pasadena, CA 91125 USA

[6] NASA, Goddard Space Flight Ctr, Exoplanets & Stellar Astrophys Lab, Code 667, Greenbelt, MD 20771 USA

[7] Univ Montreal, Inst Rech Exoplanetes, Pavillon Roger Gaudry,POB 6128 Ctr Ville STN, Montreal, PQ H3C 3J7, Canada

[8] Natl Opt Astron Observ, 950 N Cherry Ave, Tucson, AZ 85719 USA

[9] Univ Calif San Diego, Ctr Astrophys & Space Sci, 9500 Gilman Dr,Mail Code 0424, La Jolla, CA 92093 USA

[10] Bucknell Univ, Phys & Astron Dept, 701 Moore Ave, Lewisburg, PA 17837 USA

[11] Space Telescope Sci Inst, 3700 San Martin Dr, Baltimore, MD 21218 USA

[12] Univ Oklahoma, Homer L Dodge Dept Phys & Astron, 440 West Brooks St, Norman, OK 73019 USA

[13] Univ Cent Florida, Dept Phys, 4000 Cent Florida Blvd,Bldg 12,310, Orlando, FL 32816 USA

[14] Kolding Cty Hosp, Dept Cardiol, Sygehus Lillebalt 24, DK-6000 Kolding, Denmark

来源：

ASTROPHYSICAL JOURNAL | 2020年 / 895卷 / 02期

基金：

美国国家航空航天局;

关键词：

Brown dwarfs; Y dwarfs; HST photometry; Hubble Space Telescope; Near infrared astronomy; Infrared telescopes; Infrared astronomy; Infrared photometry; Infrared sources; Space telescopes; Proper motions; Parallax; COSMIC GAS CLOUDS; BROWN DWARFS; ATMOSPHERIC CHEMISTRY; GIANT PLANETS; T-DWARFS; FRAGMENTATION; STELLAR; STARS;

D O I：

10.3847/1538-4357/ab8d25

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present the discovery of WISEA J083011.95+283716.0, the first Y-dwarf candidate identified through the "Backyard Worlds: Planet 9" citizen science project. We identified this object as a red, fast-moving source with a faint W2 detection in multiepoch AllWISE and unWISE images. We have characterized this object with Spitzer and Hubble Space Telescope's (HST) follow-up imaging. With mid-infrared detections in Spitzer's ch1 and ch2 bands and flux upper limits in HST F105W and F125W filters, we find that this object is both very faint and has extremely red colors (ch1 - ch2 = 3.25 0.23 mag, F125W - ch2 >= 9.36 mag), consistent with a T-eff similar to 300 K source, as estimated from the known Y-dwarf population. A preliminary parallax provides a distance of 11.1(-1.5)(+2.0) pc, leading to a slightly warmer temperature of similar to 350 K. The extreme faintness and red HST and Spitzer colors of this object suggest that it may be a link between the broader Y-dwarf population and the coldest known brown dwarf WISE J0855-0714, and may highlight our limited knowledge of the true spread of Y-dwarf colors. We also present four additional "Backyard Worlds: Planet 9" late-T brown dwarf discoveries within 30 pc.

引用

页数：11

共 27 条

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