2020ApJ...899..123M

Query : 2020ApJ...899..123M

2020ApJ...899..123M - Astrophys. J., 899, 123-123 (2020/August-3)

Spitzer follow-up of extremely cold brown dwarfs discovered by the Backyard Worlds: Planet 9 citizen science project.

MEISNER A.M., FAHERTY J.K., KIRKPATRICK J.D., SCHNEIDER A.C., CASELDEN D., GAGNE J., KUCHNER M.J., BURGASSER A.J., CASEWELL S.L., DEBES J.H., ARTIGAU E., BARDALEZ GAGLIUFFI D.C., LOGSDON S.E., KIMAN R., ALLERS K., HSU C.-C., WISNIEWSKI J.P., ALLEN M.B., BEAULIEU P., COLIN G., DURANTINI LUCA H.A., GOODMAN S., GRAMAIZE L., HAMLET L.K., HINCKLEY K., KIWY F., MARTIN D.W., PENDRILL W., ROTHERMICH A., SAINIO A., SCHUMANN J., ANDERSEN N.S., TANNER C., THAKUR V., THEVENOT M., WALLA J., WEDRACKI Z., AGANZE C., GERASIMOV R., THEISSEN C. (The Backyard Worlds: Planet 9 Collaboration)

Abstract (from CDS):

We present Spitzer follow-up imaging of 95 candidate extremely cold brown dwarfs discovered by the Backyard Worlds: Planet 9 citizen science project, which uses visually perceived motion in multiepoch Wide-field Infrared Survey Explorer (WISE) images to identify previously unrecognized substellar neighbors to the Sun. We measure Spitzer [3.6]-[4.5] color to phototype our brown dwarf candidates, with an emphasis on pinpointing the coldest and closest Y dwarfs within our sample. The combination of WISE and Spitzer astrometry provides quantitative confirmation of the transverse motion of 75 of our discoveries. Nine of our motion-confirmed objects have best-fit linear motions larger than 1'' yr–1; our fastest-moving discovery is WISEA J155349.96+693355.2 (µ ≃ 2.''15 yr–1), a possible T-type subdwarf. We also report a newly discovered wide-separation (∼400 au) T8 comoving companion to the white dwarf LSPM J0055+5948 (the fourth such system to be found), plus a candidate late T companion to the white dwarf LSR J0002+6357 at 5.'5 projected separation (∼8700 au if associated). Among our motion-confirmed targets, five have Spitzer colors most consistent with spectral type Y. Four of these five have exceptionally red Spitzer colors suggesting types of Y1 or later, adding considerably to the small sample of known objects in this especially valuable low-temperature regime. Our Y dwarf candidates begin bridging the gap between the bulk of the Y dwarf population and the coldest known brown dwarf.

Abstract Copyright: © 2020. The American Astronomical Society. All rights reserved.

Journal keyword(s): Y dwarfs - Brown dwarfs - T dwarfs - Visual binary stars - Proper motions - Solar neighborhood - Infrared astronomy

VizieR on-line data: <Available at CDS (J/ApJ/899/123): table1.dat table2.dat table3.dat table4.dat table5.dat table6.dat table7.dat table8.dat table9.dat>

Status at CDS : Tables of objects will be appraised for possible ingestion in SIMBAD.

Simbad objects: 113

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Number of rows : 113
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 LSR J0002+6357 WD* 00 02 22.6464316729 +63 57 44.145123788   17.8   16.2   DC 17 0
2 CWISE J000229.93+635217.0 LM* 00 02 29.94101 +63 52 16.9986           ~ 2 0
3 WISE J001449.85+795115.9 BD? 00 14 49.85232 +79 51 15.9480           ~ 4 0
4 LP 704-85 PM* 00 19 08.2512488169 -09 43 37.499778786     16.87     ~ 8 0
5 CWISE J001908.34-094323.8 BD? 00 19 08.34814 -09 43 23.8271           ~ 1 0
6 WISE J002810.53+521853.6 BD? 00 28 10.53720 +52 18 53.6760           ~ 2 0
7 WISE J002909.89+190516.9 BD? 00 29 09.89784 +19 05 16.9764           ~ 2 0
8 WISE J003631.23-642735.6 BD? 00 36 31.23528 -64 27 35.6832           ~ 1 0
9 WISEU J004851.21+250814.9 BD? 00 48 50.13295 +25 08 25.2668           ~ 2 0
10 LSPM J0055+5948 WD* 00 55 58.2997210526 +59 48 02.534995690   15.2   16.0   DC: 22 0
11 CWISE J005559.92+594744.3 BD* 00 55 59.923925 +59 47 44.39813           T8 5 0
12 WISE J010116.08-520629.8 BD? 01 01 16.08336 -52 06 29.8800           ~ 1 0
13 WISE J012056.96-764216.6 BD? 01 20 56.96328 -76 42 16.6212           ~ 1 0
14 WISE J012834.88-280303.2 BD* 01 28 34.88664 -28 03 03.2544           T5 2 0
15 WISE J013217.80-581825.8 BD? 01 32 17.17266 -58 18 24.9676           ~ 4 0
16 WISEU J013522.46-221957.3 BD? 01 35 22.46736 -22 19 57.3737           ~ 1 0
17 WISEA J013810.78-412220.2 BD? 01 38 10.78558 -41 22 20.2948           ~ 1 0
18 WISE J014603.22-261908.4 BD? 01 46 03.22176 -26 19 08.4792           ~ 2 0
19 WISEA J014614.70-290048.4 BD? 01 46 14.70374 -29 00 48.4826           ~ 1 0
20 WISE J015507.40-421634.9 BD? 01 55 07.40976 -42 16 34.9428           ~ 1 0
21 WISEA J015601.22+525304.4 BD? 01 56 01.22045 +52 53 04.4002           ~ 1 0
22 WISE J021420.15-573244.6 BD* 02 14 20.15592 -57 32 44.6928           T6+ 1 0
23 WISE J025756.41-265529.0 BD? 02 57 56.05257 -26 55 30.2895           ~ 2 0
24 WISE J025805.28-321917.3 BD? 02 58 05.28480 -32 19 17.3244           ~ 1 0
25 WISE J030534.03-582635.6 BD* 03 05 33.856790 -58 26 36.83930           T8 2 0
26 WISE J032600.26+421057.0 LM* 03 26 00.26976 +42 10 57.0252           ~ 2 0
27 WISE J032811.00-422321.7 LM* 03 28 11.179609 -42 23 19.46930           ~ 2 0
28 WISE J034227.41-462251.8 BD? 03 42 27.41280 -46 22 51.8808           ~ 1 0
29 WISEA J034253.20+673143.5 BD? 03 42 53.20793 +67 31 43.5486           ~ 1 0
30 WISE J035000.32-565830.2 BD* 03 50 00.59649 -56 58 24.2429           Y1 35 0
31 WISE J035409.91-572103.9 BD? 03 54 09.91224 -57 21 03.9240           ~ 1 0
32 PSO J058.9869+45.4296 BD* 03 55 56.87140800 +45 25 46.8276600           T4 8 0
33 WISE J035733.81+070557.5 BD? 03 57 33.81360 +07 05 57.5268           ~ 2 0
34 WISE J040702.37+190946.4 BD? 04 07 02.505890 +19 09 44.55170           ~ 2 0
35 2MASSI J0415195-093506 BD* 04 15 19.54368 -09 35 06.6732           T8.0 182 0
36 WISEA J042236.95-044203.5 BD? 04 22 36.95359 -04 42 03.5338           ~ 3 0
37 WISE J050238.26+100750.1 BD* 05 02 38.35869 +10 07 51.7849           T6+ 5 0
38 WISEU J050305.68-564834.0 BD? 05 03 04.81064 -56 48 36.1305           ~ 4 0
39 WISEU J050511.06+304355.6 BD? 05 05 11.06026 +30 43 55.6288           ~ 1 0
40 LSR J0505+3043 PM* 05 05 11.7574310589 +30 43 32.008396754   18.1   16.3   esdM3.5 10 0
41 WISE J050615.54-514521.4 BD* 05 06 15.54336 -51 45 21.4416           T8+ 1 0
42 WISE J053511.97-773829.9 BD* 05 35 11.97096 -77 38 29.9904           T8+ 1 0
43 WISE J053535.43-644518.6 BD? 05 35 35.43792 -64 45 18.6264           ~ 1 0
44 WISE J061713.10+670400.7 BD? 06 17 13.10232 +67 04 00.7464           ~ 1 0
45 WISE J064503.71+524054.4 BD? 06 45 04.00458 +52 41 04.4439           ~ 3 0
46 WISE J064723.23-623235.5 BD* 06 47 23.22644 -62 32 39.7006           Y1 24 0
47 WISE J065113.69-835503.1 BD? 06 51 13.69272 -83 55 03.1872           ~ 1 0
48 LP 483-66 LM* 07 53 52.8227731779 +08 54 02.321845157   19.6   17.2   M6V 13 0
49 WISE J075438.17+090044.4 BD? 07 54 38.17968 +09 00 44.4708           ~ 1 0
50 WISE J080622.22-082046.4 BD? 08 06 21.97627 -08 20 33.8558           ~ 4 0
51 L 97-3 B BD* 08 07 14.675 -66 18 48.68           Y1 86 0
52 WISE J083011.97+283716.6 BD? 08 30 12.20039 +28 37 37.7720           ~ 11 0
53 WISE J083019.98-632305.5 BD* 08 30 19.927917 -63 23 03.74468           T8-9 5 0
54 WISE J084329.13+694709.8 BD? 08 43 29.13456 +69 47 09.8196           ~ 1 0
55 WISEA J085510.74-071442.5 BD* 08 55 16.53798 -07 14 49.3728           Y2 124 0
56 WISEA J101804.20-684254.0 LM* 10 18 03.774078 -68 42 52.26612           ~ 2 0
57 WISE J104051.79+450329.3 BD? 10 40 51.73698 +45 03 30.3751           ~ 3 0
58 WISE J104216.89-003935.7 BD? 10 42 16.91448 -00 39 35.6904           ~ 1 0
59 WISE J105349.38-460241.2 LM* 10 53 49.38600 -46 02 41.2008           ~ 3 0
60 WISE J105917.42+285729.3 BD? 10 59 17.42136 +28 57 29.3652           ~ 1 0
61 WISE J110201.78+350335.6 BD? 11 02 01.78416 +35 03 35.6256           ~ 2 0
62 WISE J112440.18+663052.2 LM* 11 24 40.186371 +66 30 51.11469           ~ 2 0
63 WISE J114350.92+401333.8 LM* 11 43 50.619934 +40 13 32.01577           ~ 2 0
64 WISE J114601.25+342458.4 BD? 11 46 01.25448 +34 24 58.4424           ~ 1 0
65 WISE J115917.90+671704.3 LM* 11 59 17.145275 +67 17 02.34074           ~ 2 0
66 WISE J125721.02+715349.7 BD? 12 57 23.19657 +71 53 47.5540           ~ 3 0
67 WISE J131102.01+312107.7 BD? 13 11 02.01336 +31 21 08.4384           ~ 1 0
68 WISEA J132441.18-372024.8 BD? 13 24 41.18232 -37 20 24.8510           ~ 1 0
69 WISEA J135042.33-830202.8 BD? 13 50 42.33653 -83 02 02.8194           ~ 1 0
70 CWISE J135937.64-435227.0 BD? 13 59 38.16894 -43 52 23.6340           ~ 3 0
71 WISEA J143422.31-083934.2 LM* 14 34 22.456786 -08 39 35.21472           ~ 2 0
72 CWISE J144606.58-231719.0 BD? 14 46 07.43130 -23 17 04.3324           ~ 15 0
73 LSPM J1459+0851 WD? 14 59 32.0670831696 +08 51 25.860049020   19.8   18.8   ~ 16 0
74 LSPM J1459+0857B BD* 14 59 35.24616 +08 57 51.1632         17.92 T4.5 17 0
75 WISE J151620.55+721745.5 BD? 15 16 20.55600 +72 17 45.5100           ~ 2 0
76 WISE J152529.08+605356.3 LM* 15 25 28.841265 +60 54 00.24446           ~ 4 0
77 WISE J154151.65-225024.9 BD* 15 41 52.28912 -22 50 24.7060           Y0 59 0
78 WISE J155349.98+693355.2 BD* 15 53 49.98864 +69 33 55.2240           sdT4 8 0
79 WISE J160516.72+002138.0 LM* 16 05 16.676785 +00 21 38.13230           ~ 3 0
80 WISE J161940.51+134752.2 BD? 16 19 40.50503 +13 47 51.9247           ~ 2 0
81 WISE J162716.43-244355.3 BD? 16 27 16.43976 -24 43 55.3764           ~ 1 0
82 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3969 1
83 WISE J162852.66+160421.3 BD? 16 28 52.66728 +16 04 21.3924           ~ 1 0
84 WISE J163932.74+184049.0 BD? 16 39 33.14707 +18 40 47.8211           ~ 5 0
85 WISEA J165902.66+274747.9 BD? 16 59 02.66702 +27 47 47.9576           ~ 1 0
86 WISEA J171331.68+245000.9 BD? 17 13 31.68170 +24 50 00.9686           ~ 1 0
87 WISE J172907.02-753017.3 BD* 17 29 06.90070 -75 30 15.7382           T7 5 0
88 WISE J175328.50-590447.5 BD? 17 53 28.69588 -59 04 44.3274           ~ 3 0
89 WISE J175701.50+183215.7 LM* 17 57 01.50672 +18 32 15.7128           ~ 2 0
90 WISE J181849.69-470146.4 BD? 18 18 49.71046 -47 01 41.5413           ~ 5 0
91 WISE J182831.08+265037.7 BD* 18 28 30.30897 +26 50 36.0751           Y0 76 0
92 WISEA J185109.93+671343.7 BD? 18 51 09.93058 +67 13 43.7196           ~ 1 0
93 WISE J190005.75-310811.2 BD? 19 00 05.81917 -31 08 07.6704           ~ 3 0
94 WISE J193054.64-205949.1 BD? 19 30 55.35147 -20 59 38.0975           ~ 5 0
95 WISE J201833.63-141720.7 BD? 20 18 33.60103 -14 17 21.7861           ~ 5 0
96 WISE J205921.90+662725.2 BD? 20 59 21.90384 +66 27 25.2756           ~ 2 0
97 WISE J211456.82-180519.3 BD? 21 14 57.21826 -18 05 14.5275           ~ 2 0
98 WISE J212020.69+303655.9 BD? 21 20 20.69448 +30 36 55.9044           ~ 1 0
99 WISE J212510.89-730758.7 BD? 21 25 10.89672 -73 07 58.7352           ~ 1 0
100 WISE J213810.99+373313.0 BD? 21 38 10.99512 +37 33 13.0284           ~ 1 0
101 WISEA J214025.23-332707.4 BD? 21 40 25.23509 -33 27 07.4754           ~ 2 0
102 SIPS J2150-7520B BD* 21 50 18.653123 -75 20 53.97657           T8 6 0
103 WISE J221841.38+143003.1 LM* 22 18 41.267931 +14 30 02.26023           ~ 3 0
104 WISE J221859.33+114644.7 BD* 22 18 59.412787 +11 46 42.74540           T7pec 4 0
105 WISE J224319.54-145857.2 BD? 22 43 19.29081 -14 58 52.0447           ~ 3 0
106 CWISE J224547.21-433341.5 LM* 22 45 47.21462 -43 33 41.6135           ~ 2 0
107 WISE J225404.13-265257.3 BD? 22 54 03.66311 -26 52 57.9059           ~ 3 0
108 WISEA J230930.58+145633.1 BD* 23 09 30.819390 +14 56 30.60553           T8 3 0
109 WISE J233816.37-732929.7 BD* 23 38 17.056964 -73 29 30.37740           T6+ 2 0
110 WISE J235120.61-700025.7 LM* 23 51 20.615032 -70 00 26.24814           ~ 3 0
111 WISEA J235136.37-250247.6 BD? 23 51 36.37378 -25 02 47.6768           ~ 1 0
112 WISEA J235402.79+024014.1 BD* 23 54 02.41845 +02 40 18.5413           Y1 18 0
113 WISE J235456.62-481439.5 LM* 23 54 56.856406 -48 14 41.54501           ~ 2 0

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