2025AJ....169..100B

Query : 2025AJ....169..100B

2025AJ....169..100B - Astron. J., 169, 100 (2025/February-0)

New Ultracool Companions to Nearby White Dwarfs.

BRAVO A., SCHNEIDER A.C., CASEWELL S., ROTHERMICH A., FAHERTY J.K., FRENCH J.R., BICKLE T.P., MEISNER A.M., KIRKPATRICK J.D., KUCHNER M.J., BURGASSER A.J., MAROCCO F., DEBES J.H., SAINIO A., GRAMAIZE L., KIWY F., JALOWICZOR P.A. and ABDULLAHI A.

Abstract (from CDS):

We conducted a search for new ultracool companions to nearby white dwarfs using multiple methods, including the analysis of colors and examination of images in both the optical and the infrared. Through this process, we identified 51 previously unrecognized systems with candidate ultracool companions. 31 of these systems are resolved in at least one catalog, and all but six are confirmed as comoving companions via common proper motion and consistent parallax measurements (when available). We have followed up four comoving companions with near-infrared spectroscopy and confirm their ultracool nature. The remaining twenty candidates are unresolved, but show clear signs of infrared excess which is most likely due to the presence of a cold, low-mass companion or a dusty circumstellar disk. Three of these unresolved systems have existing optical spectra that clearly show the presence of a cool stellar companion to the white dwarf primary via spectral decomposition. These new discoveries, along with our age estimates for the primary white dwarfs, will serve as valuable benchmark systems for future characterization of ultracool dwarfs.

Abstract Copyright: © 2025. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Low mass stars - Brown dwarfs - White dwarf stars - Binary stars

Simbad objects: 172

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Number of rows : 172
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 PSO J001.1128+74.0285 WD? 00 04 27.0117718344 +74 01 41.783050128           ~ 4 0
2 GALEX J000801.3-350447 WD* 00 08 01.2592078344 -35 04 49.630535616           DA 7 0
3 SDSS J000837.26+351144.2 WD* 00 08 37.2197233992 +35 11 44.516681592           DA: 8 0
4 Gaia DR3 4976687904203453184 WD* 00 12 37.0583715000 -49 24 22.818903516           DA 5 0
5 WISE J001238.07-492358.6 LM* 00 12 38.1126668727 -49 23 58.498516007           ~ 1 0
6 2MASS J00141872-4757203 LM* 00 14 18.7109056793 -47 57 20.337635027           ~ 2 0
7 Gaia DR3 4977418740133758592 WD* 00 14 19.1666746800 -47 57 19.581161868           D 9 0
8 SDSS J002455.04-163113.7 WD* 00 24 54.9955625040 -16 31 13.234499688           DA: 6 0
9 PHL 6609 WD* 00 45 58.0315456920 +14 54 49.811247828   18.6       DA 20 0
10 2MASS J00491203+3841307 WD* 00 49 12.0292836288 +38 41 30.496011216           DA 16 0
11 PHL 855 WD* 00 50 45.8241496920 -03 26 55.463741196   17.2 17.3     DA 15 0
12 CWISE J005559.92+594744.3 BD* 00 55 59.923925 +59 47 44.39813           T8 5 0
13 WISE J005815.35-563810.4 WD* 00 58 15.5111595480 -56 38 10.160359584           DA 10 0
14 GALEX J010726.2+251835 WD* 01 07 26.2184947344 +25 18 35.597452392           DA 15 0
15 SDSS J010749.32+210744.8 WD* 01 07 49.3800977472 +21 07 45.839104644           DAZ 15 0
16 GD 685 WD* 01 09 33.1581074544 -19 01 17.559336144   16.252 16.166 16.1   DA3.3 41 0
17 JL 234 WD* 01 12 21.1414771296 -56 14 27.511008720   15.720 15.781     DBAZ 30 0
18 WISEA J012708.71-575916.2 WD* 01 27 09.0616632840 -57 59 14.447500872           DA 11 0
19 PHL 3418 ** 01 33 26.4069631752 +04 01 04.571681880           D+dM6 9 0
20 LP 468-128 ** 01 35 32.9751928872 +14 45 55.898593668   17.1   16.6   DA+L5 65 0
21 PSO J024.0379-25.9371 WD* 01 36 08.9351275848 -25 56 14.100134424           DA 7 0
22 GALEX J014754.8+233942 WD* 01 47 54.8179400496 +23 39 43.599226356   14.126 14.014 14.133   DA3.9 50 1
23 2MASS J01495291-6129055 LM* 01 49 52.9204001064 -61 29 05.505135936           ~ 4 0
24 Gaia DR3 4712727980220151424 WD* 01 49 53.5533760344 -61 29 16.971797220           D 10 0
25 PSO J028.7556-13.1307 WD? 01 55 01.2574600584 -13 07 49.193636988           ~ 5 0
26 GALEX J020525.3-794104 WD* 02 05 24.9396679488 -79 41 03.774131268           DA 13 0
27 LSPM J0207+3331 WD* 02 07 33.8061412464 +33 31 29.541888120   17.9   17.2   DA 17 0
28 GALEX J021912.7-630655 WD* 02 19 12.8106308808 -63 06 54.862576848   16.430 16.061     DA+? 5 0
29 PHL 4040 WD* 02 23 20.5530255168 -04 59 06.661597020           DA 11 0
30 Gaia DR3 4966305490779907584 WD* 02 30 20.8814701800 -34 47 49.371870408           DA 7 0
31 2MASS J02302150-3447466 LM* 02 30 21.5111237568 -34 47 46.563561168           ~ 3 0
32 PHL 1364 CV* 02 34 27.7306208904 -04 54 30.685972572   16.602 16.402   16.20 ~ 25 1
33 PSO J039.2665-19.5481 WD* 02 37 03.9389192592 -19 32 53.651117076           DA 6 0
34 2MASS J02370405-1932185 LM* 02 37 04.0543885248 -19 32 18.536813376           ~ 2 0
35 LSPM J0241+2553 WD* 02 41 49.2760659864 +25 53 44.600772300   18.6   17.7   D 13 0
36 LSPM J0241+2553B BD* 02 41 51.53784 +25 53 45.2903           L1 6 0
37 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7988 0
38 GD 40 WD* 03 02 53.1037481136 -01 08 33.798683976   15.479 15.384     DBZ4 187 0
39 UCAC4 752-029666 WD* 03 24 38.6616833160 +60 20 55.874094612   16.165 16.074     DA 10 0
40 2MASS J03243965+6020547 LM* 03 24 39.70609920 +60 20 54.7615320           ~ 1 0
41 GALEX J033645.4+704410 WD* 03 36 45.4533899592 +70 44 11.154820884           D 9 0
42 PSO J058.9855+45.4184 WD* 03 55 56.4978926184 +45 25 10.260230556           DA 15 0
43 PSO J058.9869+45.4296 BD* 03 55 56.87140800 +45 25 46.8276600           T4 8 0
44 PSO J059.1561+32.2012 WD* 03 56 37.4253442392 +32 12 05.014307232           DA 8 0
45 PSO J059.1568+32.2025 LM* 03 56 37.64530800 +32 12 09.0191520           ~ 1 0
46 EGGR 570 ** 03 58 17.1311170320 +46 28 39.741894840   15.868 15.663 15.578   DA+dM 36 0
47 2MASS J04004664-2611284 LM* 04 00 46.64448 -26 11 28.4640           ~ 1 0
48 PSO J060.1949-26.1915 WD* 04 00 46.8389941968 -26 11 27.895647984           DA 5 0
49 HS 0401+1454 WD* 04 04 35.0204244984 +15 02 26.597941584   16.241 15.894 16.141   DA 20 0
50 V* VW Hyi CV* 04 09 11.3967378648 -71 17 41.554528260   12.786 12.543 14.160   DQ 661 0
51 GALEX J041653.2+262418 ** 04 16 53.2847479948 +26 24 20.413740689   15.977 15.695 15.824   D+M5 9 0
52 MCT 0420-7310 WD* 04 19 37.7671921656 -73 03 44.509661424 14.74 15.450 15.507 16.158   DA 22 0
53 2MASS J04264113+4044426 LM* 04 26 41.14348800 +40 44 42.8002440           ~ 1 0
54 GALEX J042641.3+404442 WD* 04 26 41.3320723128 +40 44 41.955449712           DA 7 0
55 PM J04339+2827 WD* 04 33 54.5734956936 +28 27 29.074639392   15.811 15.760 15.878   DA 15 0
56 GD 61 WD* 04 38 39.3740627256 +41 09 32.353957332 13.801 14.767 14.879 14.932 14.970 DBAZ3 112 0
57 WT 155B LM* 04 47 11.8722436584 -58 23 18.417831684           ~ 5 0
58 WT 155 WD* 04 47 13.5833001000 -58 23 18.039282324           DA 12 0
59 GALEX J051002.1+231541 WD* 05 10 02.1463140984 +23 15 41.420352960   15.004 15.108 15.612   DA+? 23 0
60 Gaia DR3 2985461630357270656 WD* 05 25 55.9340250527 -13 23 06.143461050           DA 3 0
61 2MASS J05255594-1323051 LM* 05 25 55.9575032959 -13 23 04.912333141           ~ 2 0
62 GALEX J052933.2-635653 WD* 05 29 33.3489640560 -63 56 55.290865272           DA 9 0
63 GALEX J053112.5-245120 WD* 05 31 12.4343468976 -24 51 20.872392336           DA 7 0
64 SDSS J054224.20+014414.5 WD* 05 42 24.1707961800 +01 44 14.641701648           DA 13 0
65 2MASS J06094216-3035529 WD* 06 09 42.1401260448 -30 35 52.739390940           DA 7 0
66 SDSS J064111.04-202743.8 WD* 06 41 11.0410880472 -20 27 43.826262804           DA 10 0
67 WISE J064244.66-472108.5 WD* 06 42 44.7378396672 -47 21 10.236648960           DA: 5 0
68 PSO J103.1973+56.4810 WD* 06 52 47.3562629232 +56 28 51.604545900           DA: 4 0
69 2MASS J06524744+5628494 LM* 06 52 47.46503280 +56 28 49.3848120           ~ 1 0
70 UCAC4 451-028583 WD* 07 02 45.8695785864 +00 03 18.995983848       15.454   DA 12 0
71 2MASS J07160935+0038434 LM* 07 16 09.39240000 +00 38 42.2540520           ~ 1 0
72 PSO J109.0398+00.6455 WD? 07 16 09.5347958712 +00 38 45.430666152           ~ 4 0
73 GALEX J073504.2-794409 WD* 07 35 04.0710963144 -79 44 10.685497992           DA 8 0
74 WISE J073504.47-794407.8 LM* 07 35 04.47029 -79 44 07.8209           ~ 1 0
75 EGGR 57 WD* 07 55 08.9542290011 -14 45 50.944618116   13.605 13.588 13.916   DA2.6 42 0
76 2MASS J08022777+5631555 WD* 08 02 27.7446137376 +56 31 55.457163840           DA 14 0
77 LSPM J0806+2215 WD* 08 06 48.0486891672 +22 15 51.652018692   18.5   17.5   DA 12 0
78 LSPM J0806+2215B BD* 08 06 48.41976 +22 15 45.6012           L3 2 0
79 Gaia DR3 5320324977678609792 WD* 08 07 00.0568405728 -53 50 49.767839124           DA 4 0
80 2MASS J08070010-5350507 LM* 08 07 00.1015591461 -53 50 50.943407754           ~ 1 0
81 L 97-3 B BD* 08 07 14.675 -66 18 48.68           Y1 86 0
82 KUV 08084+4221 WD* 08 11 49.3475011056 +42 12 08.949521412           DA3.2 24 0
83 PSO J123.3326-13.9736 WD* 08 13 19.8542440584 -13 58 25.245222708           D 8 0
84 2MASS J08132024-1358244 LM* 08 13 20.24400 -13 58 24.4632           ~ 1 0
85 2MASS J08245946-2546495 LM* 08 24 59.4726725519 -25 46 49.697147406           ~ 2 0
86 PSO J126.2480-25.7806 WD* 08 24 59.6343060912 -25 46 52.782141180           DA 6 0
87 SDSS J082545.10-021025.0 WD* 08 25 45.0858751488 -02 10 24.725511012           DA: 8 0
88 GALEX J093341.3-100009 WD* 09 33 41.3146773960 -10 00 09.199782360           DA 10 0
89 GALEX J094755.6-231234 WD* 09 47 55.6812837528 -23 12 34.106282856   15.265 15.417 15.822   DA 11 0
90 WISE J095004.71+130938.1 LM* 09 50 04.71565 +13 09 38.1070           ~ 1 0
91 GALEX J095004.8+130936 WD* 09 50 04.7777757864 +13 09 37.816077136           D 6 0
92 PM J09598-5027A WD* 09 59 53.9214925918 -50 27 17.747507192           DQ 5 0
93 GALEX J100609.1+004416 WD* 10 06 09.1742329440 +00 44 17.077582896           DA7+M 22 0
94 GALEX J101728.5-323608 WD* 10 17 28.5203785272 -32 36 08.846284536           DA 11 0
95 PG 1015+161 WD* 10 18 03.8273436048 +15 51 58.566029940   15.596 15.607 16.000   DA2.5 92 0
96 GALEX J104202.6+342224 WD* 10 42 03.0361569816 +34 22 27.380907552           DA: 6 0
97 2MASS J10462785+6054524 LM* 10 46 27.8434909656 +60 54 52.338913524           M8 3 0
98 SDSS J104627.90+605448.3 WD* 10 46 27.9069902976 +60 54 48.319125192           DC: 7 0
99 LSPM J1052+3323 WD* 10 52 12.5472476952 +33 23 18.377659104   20.2   19.8   DA 10 0
100 LP 264-22 ** 11 14 24.6754469304 +33 41 24.390457800   17.8   17.8   DA+M 18 0
101 GD 133 WD* 11 19 12.3988618680 +02 20 33.045927216   14.734 14.617 14.855   DA4.0 107 0
102 GALEX J112542.4-163154 WD* 11 25 42.4314528602 -16 31 54.242900933   16.491 16.132     DA 2 0
103 LP 554-8 WD* 11 57 45.9338231112 +06 31 48.275671008   17.1   17.5   DA 20 0
104 SDSS J120815.59+084543.0 WD* 12 08 15.6129804048 +08 45 43.165145952         17.77 DA 12 0
105 GALEX J121314.4+114049 WD* 12 13 14.4776803368 +11 40 50.139671016           DA 19 0
106 EC 12204-2915 WD* 12 23 05.0902857696 -29 32 28.288920408   15.800 15.787 15.847   DA2.7 22 0
107 SDSS J123304.35+030245.7 WD* 12 33 04.3519905528 +03 02 45.837082032           DA 7 0
108 SDSS J123404.67+442802.0 LM* 12 34 04.67345 +44 28 02.0831           ~ 1 0
109 SDSS J123405.08+442750.0 WD* 12 34 05.0956152984 +44 27 50.060641248           DA 7 0
110 PG 1241-010 WD* 12 44 28.5731497128 -01 18 57.854663568   13.86 14.00 14.3   DA2.1 63 0
111 WISE J125044.31+415259.2 LM* 12 50 44.31221 +41 52 59.2644           M7 1 0
112 Gaia DR3 1528081400354933760 WD* 12 50 44.4407541240 +41 52 59.537097984           DA6 3 0
113 V* EX Hya CV* 12 52 24.2222471899 -29 14 55.999766523   13.505 13.491 13.549   M5-6V 730 0
114 2MASS J12564352-6202041 BD* 12 56 43.5338984151 -62 02 04.301972270           sdL3 9 0
115 VVV J125644.42-620208.1 WD* 12 56 46.0508114620 -62 02 08.537269533           DC 8 0
116 G 61-29 CV* 13 05 42.4009686696 +18 01 03.763561619   16.059 16.101 15.825   DBe 284 0
117 V* V396 Hya CV* 13 12 46.4399548464 -23 21 32.595789924   18.9   17.5   DD 114 0
118 GALEX J131730.9+483334 WD* 13 17 30.8608336320 +48 33 33.051133404           DA 16 0
119 2MASS J13442103-5738281 LM* 13 44 21.0448323322 -57 38 28.174202015           ~ 2 0
120 Gaia DR3 5871887083021078400 WD* 13 44 22.3266675025 -57 38 24.597803566           DA 4 0
121 2MASS J14183499+0929226 LM* 14 18 34.99824 +09 29 22.6032           ~ 2 0
122 GALEX J141835.2+092920 WD* 14 18 35.2915642584 +09 29 19.680198144           DA 12 0
123 GALEX J142152.2+143646 WD* 14 21 52.2360458160 +14 36 46.101360816           DA 6 0
124 GD 165B BD* 14 24 39.09480 +09 17 10.4352         20.53 L4V 216 0
125 G 200-42 WD* 14 28 33.7357493688 +44 03 46.937099268           DZ 33 0
126 GALEX J143830.0-312719 WD* 14 38 30.0876216432 -31 27 19.789439076   15.01 14.84 15.04   DA+? 5 0
127 CBS 204 WD* 14 50 06.6567332760 +40 55 35.202894168   16.073 15.931 16.151   DA3.4 25 0
128 LSPM J1459+0857B BD* 14 59 35.24616 +08 57 51.1632         17.92 T4.5 17 0
129 SDSS J150549.33+330410.5 WD* 15 05 49.3405839096 +33 04 10.817181156           DA: 5 0
130 V* KX Dra WD* 15 41 44.8895982744 +64 53 52.977685920   15.562 15.523 15.658   DA4.2 60 1
131 GALEX J155516.9+315307 WD* 15 55 16.9315754616 +31 53 06.952449948           DA 13 0
132 SDSS J160839.53+172336.9 WD* 16 08 39.5510385480 +17 23 36.671947224           DA 20 0
133 SBSS 1612+554 WD* 16 13 16.6332055200 +55 21 25.963077960   16.23 15.86 16.16   DA4.2 30 0
134 GALEX J162324.1+343648 WD* 16 23 24.0720569642 +34 36 47.360306189           DA 17 0
135 2MASS J16281620-0418101 PM* 16 28 16.1971679712 -04 18 10.257349140           ~ 3 0
136 LSPM J1641+3504SA WD* 16 41 19.1908414488 +35 04 25.081983120           DC 4 0
137 2MASS J16421975+5151518 LM* 16 42 19.75320 +51 51 51.8652           ~ 1 0
138 SDSS J164220.28+515150.9 WD? 16 42 20.3046947040 +51 51 51.001048260           ~ 3 0
139 GALEX J165125.9+663506 WD* 16 51 26.0528004168 +66 35 06.349106292           DZ 12 0
140 GALEX J165737.2-125633 ** 16 57 37.3047478358 -12 56 34.455681711   15.446 15.336 15.491   DA3+M4 3 0
141 PSO J258.7845-19.1751 WD* 17 15 08.2997474465 -19 10 29.624334393           DA: 5 0
142 2MASS J17150843-1910297 LM* 17 15 08.4407036637 -19 10 29.833048041           ~ 2 0
143 GALEX J172349.6+045846 WD* 17 23 49.6822588512 +04 58 47.541405972           DA 16 0
144 GALEX J172845.7+205341 WD* 17 28 45.7091348136 +20 53 41.679524616           DA 14 0
145 GD 362 WD* 17 31 34.3168718112 +37 05 20.711767812   16.3   16.4   DAZB 200 0
146 LSPM J1840+3438A WD* 18 40 14.7058021368 +34 38 46.510404756           DA: 6 0
147 PSO J283.8338-23.2454 WD* 18 55 20.0838721200 -23 14 40.895219688           DA 9 0
148 GD 532 WD* 19 03 19.5639940824 +60 35 52.650601872       15.214   DA 20 0
149 LP 141-35 WD* 19 24 09.6182135064 +55 06 48.480464664   17.2   16.9   DA 13 0
150 2MASS J20055023+6932296 LM* 20 05 50.2044806745 +69 32 29.414629725           ~ 2 0
151 PSO J301.4596+69.5412 WD* 20 05 50.3872304640 +69 32 27.210092208           DA: 6 0
152 PSO J306.3884+35.2525 WD* 20 25 33.2524463976 +35 15 10.145497572           DA 10 0
153 2MASS J20253351+3515035 LM* 20 25 33.5231874704 +35 15 03.545856395           M8 3 0
154 GALEX J205148.3-355820 WD* 20 51 48.2795677488 -35 58 20.325972180           DA 8 0
155 2MASS J20535705+2603262 * 20 53 57.0601390032 +26 03 26.286930720           ~ 2 0
156 2MASS J21185959+4205561 LM* 21 18 59.5993664064 +42 05 56.150697516           M8 2 0
157 PSO J319.7567+42.1046 WD* 21 19 01.5970158000 +42 06 17.338546908           DA 10 0
158 SDSS J221536.65+134711.1 WD? 22 15 36.6711957624 +13 47 11.180371992           ~ 4 0
159 PHL 5038 ** 22 20 30.6964465632 -00 41 07.474052544         16.890 DA+L8-9 40 0
160 SDSS J222551.65+001637.7 ** 22 25 51.6471445344 +00 16 37.710746364         18.475 DA+L4 19 0
161 GALEX J222958.1+302409 WD* 22 29 58.0768879008 +30 24 10.009386072   16.364 16.161 16.230   DA 23 0
162 G 28-27 WD* 22 57 26.1169629840 +07 55 42.593636856           DAH 47 0
163 V* ZZ Psc WD* 23 28 47.6365087803 +05 14 54.235051503   13.217   13.106   DA4.1 536 0
164 V* V455 And CV* 23 34 01.4484962496 +39 21 40.866079356   16.220 16.094 16.137   DQ 166 0
165 GALEX J233910.9+255205 ** 23 39 10.9121345040 +25 52 05.812179600           DA5+M7 5 0
166 EC 23379-3725 WD* 23 40 36.6398059560 -37 08 44.717893332   16.11 16.17     DA 14 0
167 PSO J356.2807+58.2208 WD* 23 45 07.3315092552 +58 13 15.071414232           DAV 13 0
168 Gaia DR3 6532801770119392384 WD? 23 53 19.7316586992 -43 25 17.820079032           ~ 4 0
169 WISE J235320.40-432515.9 LM* 23 53 20.40934 -43 25 15.9648           ~ 1 0
170 PSO J358.8404+51.5181 WD* 23 55 21.5870341224 +51 31 06.107772720           DA 8 0
171 2MASS J23552187+5130489 LM* 23 55 21.8762043119 +51 30 49.002580684           M8 2 0
172 LP 292-8 WD* 23 57 45.7563384072 +30 43 57.706172688           DA: 8 0

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