2020PASP..132j4401A

Query : 2020PASP..132j4401A

2020PASP..132j4401A - Publ. Astron. Soc. Pac., 132, part no 10, 4401-104401 (2020/October-0)

A novel survey for young substellar objects with the W-band filter. I. Filter design and new discoveries in Ophiuchus and Perseus.

ALLERS K.N. and LIU M.C.

Abstract (from CDS):

We present the design and implementation of a medium-band near-IR filter tailored for detecting low-mass stars and brown dwarfs from the summit of Maunakea. The W-band filter is centered at 1.45 µm with a bandpass width of 6%, designed to measure the depth of the H2O water absorption prominent in objects with spectral types of M6 and later. When combined with standard J and H photometry, the W-band filter is designed to determine spectral types to ≃1.4 subtypes for late-M and L dwarfs, largely independent of surface gravity and reddening. This filter's primary application is completing the census of young substellar objects in star-forming regions, using W-band selection to greatly reduce contamination by reddened background stars that impede broad-band imaging surveys. We deployed the filter on the UH 88 inch telescope to survey ∼3 degree2 of the NGC 1333, IC 348, and ρ Ophiuchus star-forming regions. Our spectroscopic followup of W-band selected candidates resulted in the confirmation of 48 ultracool dwarfs with a success rate of 89%, demonstrating the efficacy of this new filter and selection method.

Abstract Copyright: © 2020. The Astronomical Society of the Pacific. All rights reserved.

Journal keyword(s):

VizieR on-line data: <Available at CDS (J/PASP/132/j4401): table3.dat table4.dat table5.dat table6.dat>

Nomenclature: Tables 4-6: [AL2020b] UHW JDDD.ddddd+DD.ddddd N=59.

Simbad objects: 94

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Number of rows : 94
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 IC 138 Sy1 01 33 01.9763749752 -00 41 23.376196356   14.9       ~ 39 0
2 2MASS J03290141+3049146 LM* 03 29 01.4196384411 +30 49 14.608667570           M7 8 0
3 2MASS J03290388+3056297 Y*? 03 29 03.8802678528 +30 56 29.678416440           ~ 9 0
4 2MASS J03290693+3129571 LM* 03 29 06.935 +31 29 57.13           M7.0 5 0
5 NGC 1333 OpC 03 29 09.2 +31 20 59           ~ 1575 1
6 2MASS J03291355+3123469 Y*? 03 29 13.55 +31 23 47.0           ~ 3 0
7 MBO 69 LM* 03 29 24.4589151072 +31 28 14.789963388           M7.5V 10 0
8 SONYC NGC 1333-19 BD* 03 29 36.35 +31 17 49.8           L0 3 0
9 2MASS J03294415+3119478 LM* 03 29 44.154 +31 19 47.89           M8 11 0
10 2MASS J03310143+3037512 BD* 03 31 01.43424 +30 37 51.2508           L0 1 0
11 NAME Perseus Cloud SFR 03 35.0 +31 13           ~ 1553 0
12 HD 22859 * 03 41 43.3548736272 +37 35 13.757577396   7.85 7.80     A0V 31 0
13 2MASS J03415675+3150181 LM* 03 41 56.75136 +31 50 18.1500           M5 1 0
14 2MASS J03421117+3156599 * 03 42 11.17368 +31 56 59.9820           ~ 1 0
15 2MASS J03421410+3157350 * 03 42 14.10096 +31 57 35.0136           ~ 1 0
16 2MASS J03424226+3143171 LM* 03 42 42.26328 +31 43 17.1192           M8 1 0
17 2MASS J03425096+3156288 LM* 03 42 50.96064 +31 56 28.8348           M7 1 0
18 2MASS J03425586+3204283 LM* 03 42 55.86624 +32 04 28.3692           M7 1 0
19 2MASS J03430144+3202143 LM* 03 43 01.4513603627 +32 02 14.335279043           M6 2 0
20 2MASS J03430194+3144355 LM* 03 43 01.9506191184 +31 44 35.546656524           M7 14 0
21 2MASS J03430471+3209362 LM* 03 43 04.71096 +32 09 36.2196           M8 1 0
22 2MASS J03435754+3214488 LM* 03 43 57.5458066560 +32 14 48.892808652           M7 4 0
23 2MASS J03440291+3152277 BD* 03 44 02.9196617784 +31 52 27.770506392           L8.0 18 0
24 2MASS J03441023+3132378 LM* 03 44 10.23600 +31 32 37.8672           M8 1 0
25 Cl* IC 348 LRL 329 TT* 03 44 15.5745024960 +32 09 21.826029564       20.94 17.550 M7.5 39 0
26 2MASS J03441796+3135165 * 03 44 17.96880 +31 35 16.5012           ~ 1 0
27 Cl* IC 348 LRL 278 TT* 03 44 31.0315207152 +32 05 46.017002652     21.22 18.29 16.692 M4.7 28 0
28 IC 348 OpC 03 44 31.1 +32 10 02           ~ 1476 1
29 Cl* IC 348 H 149 Or* 03 44 34.0402709304 +32 06 57.087545688       19.47 16.927 M7.25 33 0
30 2MASS J03443455+3142440 LM* 03 44 34.55952 +31 42 44.0100           M6 1 0
31 Cl* IC 348 LRL 165 Or* 03 44 35.4519250704 +32 08 56.363890776     20.73 17.71 16.028 M5.25 55 0
32 Cl* IC 348 LRL 230 Or* 03 44 35.5092908952 +32 08 04.616682216     20.60 18.26 16.176 M5.25 34 0
33 Cl* IC 348 LRL 248 Or* 03 44 35.9457607224 +32 09 24.296124816     20.84   16.413 M5 28 0
34 Cl* IC 348 LRL 353 TT* 03 44 38.1411921336 +32 10 21.569448468       17.71 16.920 ~ 29 0
35 Cl* IC 348 LRL 298 TT* 03 44 38.8597982136 +32 06 36.439328808     20.90 18.95 16.521 M6.0 37 0
36 Cl* IC 348 LRL 355 Or* 03 44 39.1974844872 +32 08 13.757248464         18.034 M8 32 0
37 Cl* IC 348 LRL 277 TT* 03 44 39.4278031440 +32 10 08.119267788     19.99 17.60 16.095 M5 28 0
38 Cl* IC 348 LRL 454 LM* 03 44 41.5656037320 +32 10 39.321630588       19.07 17.827 M5.75 24 0
39 2MASS J03452390+3211544 LM* 03 45 23.8931201448 +32 11 54.486427056           M5.75 2 0
40 2MASS J03453013+3137386 * 03 45 30.13488 +31 37 38.6580           ~ 1 0
41 2MASS J03453345+3145553 LM* 03 45 33.4612076088 +31 45 55.367850060           M6 15 0
42 HD 24000 * 03 50 32.0260843968 +29 44 41.753795784   9.08 8.78     A0V 34 0
43 2MASS J04190110+2819420 TT* 04 19 01.1052204768 +28 19 42.090142476           M5.9 77 0
44 2MASS J04321606+1812464 TT* 04 32 16.0659498216 +18 12 46.383640812   19.20 17.595     M6.5 97 0
45 2MASS J04330197+2421000 TT* 04 33 01.9716248352 +24 21 00.070327692     17.951     M7.1 55 0
46 2MASS J04361038+2259560 Or* 04 36 10.3843111944 +22 59 55.998727368     22.520   16.81 M8Ve 63 0
47 V* GM Tau LM* 04 38 21.3383367240 +26 09 13.775325624     17.577   15.04 M6.5 130 0
48 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 4971 0
49 Ross 409 PM* 05 33 02.4952083673 +29 23 19.986270195   13.56 12.03 11.602   sdM0.0 41 0
50 BD+33 1505 PM* 07 19 31.2746924218 +32 49 48.339033877   10.58   9.513   M0V 109 0
51 G 196-3B BD* 10 04 20.6391105792 +50 22 59.378638152           L3beta 115 0
52 HD 142093 PM* 15 52 00.5522255904 +15 14 09.322718280   7.89 7.33     G2V 57 0
53 2MASS J16210222-2358395 LM* 16 21 02.2322980224 -23 58 39.678492180           M5.5 13 0
54 [AL2020b] UHW J245.32623-23.90277 * 16 21 18.30 -23 54 10.0           ~ 1 0
55 2MASS J16213591-2355035 LM* 16 21 35.9070168144 -23 55 03.473141304       19.5 16.5 M6 18 0
56 ATO J245.4832-23.3506 V* 16 21 55.9770996144 -23 21 01.886961168           ~ 9 0
57 2MASS J16222039-2307524 BD* 16 22 20.39664 -23 07 52.4064         21.74 L0 2 0
58 2MASS J16224043-2333508 Y*O 16 22 40.4159508816 -23 33 50.332608900           M4.5 9 0
59 [AL2020b] UHW J245.68198-24.03424 LM* 16 22 43.68 -24 02 03.3           M7 1 0
60 2MASS J16225073-2413466 LM* 16 22 50.73336 -24 13 46.6716           M5 1 0
61 2MASS J16231522-2347052 LM* 16 23 15.1306702871 -23 47 05.091634487         19.58 M8 4 0
62 2MASS J16233062-2413199 LM* 16 23 30.6401701392 -24 13 20.272481184           M6 10 0
63 2MASS J16234840-2413353 LM* 16 23 48.40296 -24 13 35.3496           M7 1 0
64 2MASS J16241591-2411148 LM* 16 24 15.9222071472 -24 11 15.027875448           M6 10 0
65 SONYC RhoOph-7 BD* 16 26 03.29086 -24 30 25.6846           L0 10 0
66 BKLT J162618-242951 LM* 16 26 18.58104 -24 29 51.4860           M6.75 20 0
67 [GY92] 3 Or* 16 26 21.9078410496 -24 44 39.697627344       17.95 15.62 M6.5 62 0
68 BKLT J162630-241214 LM* 16 26 30.38592 -24 12 11.7324           M6 3 0
69 [GY92] 80 LM* 16 26 37.8105478872 -24 39 03.114912780           M5.25-5.5 27 0
70 BKLT J162643-241046 LM* 16 26 43.4367999456 -24 10 44.088550140           M6 7 0
71 2MASS J16265226-2401466 LM* 16 26 52.260 -24 01 46.70           M7.5 5 0
72 SONYC RhoOph-1 BD* 16 26 56.33520 -24 42 37.7244           L0 8 0
73 [GY92] 204 TT* 16 27 06.5924837856 -24 41 48.871282992       17.57 15.43 M5 113 0
74 2MASS J16271853-2407218 LM* 16 27 18.5352936792 -24 07 21.799836948           M7.5 5 0
75 2MASS J16273615-2404576 LM* 16 27 36.1530517200 -24 04 57.646787736           M6 12 0
76 [GY92] 320 LM* 16 27 40.8466548528 -24 29 00.785382684           M7.75 29 0
77 BKLT J162747-244942 * 16 27 47.4624377640 -24 49 43.643251920           ~ 4 0
78 2MASS J16275835-2359148 LM* 16 27 58.3496549098 -23 59 14.917709927           M8 4 0
79 BKLT J162804-245034 LM* 16 28 04.7796048144 -24 50 35.541470148           M6 12 0
80 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3969 1
81 BKLT J162810-242421 BD* 16 28 10.45080 -24 24 20.0700           L0 10 0
82 BKLT J162847-242814 LM* 16 28 47.0407068024 -24 28 13.794525444       18.05 16.00 M6 26 0
83 BKLT J162848-243309 LM* 16 28 48.6029198112 -24 33 08.956758060           M7 2 0
84 BKLT J162848-242631 LM* 16 28 48.7135089240 -24 26 31.708697712           M6.25 22 0
85 2MASS J16293249-2402347 LM* 16 29 32.49312 -24 02 34.7712           M6 1 0
86 [AL2020b] UHW J247.94088-24.62855 LM* 16 31 45.81 -24 37 42.8           M8 1 0
87 [AL2020b] UHW J247.95427-24.78060 BD* 16 31 49.02 -24 46 50.2           L1 2 0
88 LDN 1689 DNe 16 32 22.5 -24 28 29           ~ 153 0
89 2MASS J16344577-2449218 * 16 34 45.77544 -24 49 21.8928           ~ 1 0
90 HD 149827 * 16 38 14.5884029352 -24 53 14.818523280 9.77 9.85 9.63     A0V 23 0
91 HD 151787 * 16 50 28.3484783256 -24 30 58.210169328   8.90 8.81     A0V 14 0
92 HD 153068 * 16 58 06.7388866248 -23 01 43.572264888   9.69 9.49     A0V 8 0
93 NAME Serpens Cloud SFR 18 29 49 +01 14.8           ~ 1195 1
94 * alf Lyr dS* 18 36 56.33635 +38 47 01.2802 0.03 0.03 0.03 0.07 0.10 A0V 2787 1

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