2023AJ....166..226B

Query : 2023AJ....166..226B

2023AJ....166..226B - Astron. J., 166, 226 (2023/December-0)

An Investigation of New Brown Dwarf Spectral Binary Candidates From the Backyard Worlds: Planet 9 Citizen Science Initiative.

BRAVO A., SCHNEIDER A.C., BARDALEZ GAGLIUFFI D., BURGASSER A.J., MEISNER A.M., KIRKPATRICK J.D., FAHERTY J.K., KUCHNER M.J., CASELDEN D., SAINIO A., HAMLET L. (The Backyard Worlds: Planet 9 Collaboration)

Abstract (from CDS):

We present three new brown dwarf spectral-binary candidates: CWISE J072708.09-360729.2, CWISE J103604.84-514424.4, and CWISE J134446.62-732053.9, discovered by citizen scientists through the Backyard Worlds: Planet 9 project. Follow-up near-infrared spectroscopy shows that each of these objects is poorly fit by a single near-infrared standard. We constructed binary templates and found significantly better fits, with component types of L7+T4 for CWISE J072708.09-360729.2, L7+T4 for CWISE J103604.84-514424.4, and L7+T7 for CWISE J134446.62-732053.9. However, further investigation of available spectroscopic indices for evidence of binarity and large amplitude variability suggests that CWISE J072708.09-360729.2 may instead be a strong variability candidate. Our analysis offers tentative evidence and characterization of these peculiar brown dwarf sources, emphasizing their value as promising targets for future high-resolution imaging or photometric variability studies.

Abstract Copyright: © 2023. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Brown dwarfs - L dwarfs - T dwarfs - Binary stars

Status at CDS : Objects in title, abstract, text, figures, and all or part of small table(s) being processed in SIMBAD.

Simbad objects: 27

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Number of rows : 27
N Identifier Otype ICRS (2000)
RA 		ICRS (2000)
DEC 		Proper motions Parallaxes Redshift Rad. vel. cz Mag U Mag B Mag V Mag R Mag I Sp type Morph. type Angular size #ref
1983 - 2024
1 SIMP J0150099+382725 BrownD* 01 50 09.97272 +38 27 25.9308 878.2 -125.1 39.8 ~ ~ ~           T0 ~ ~ ~ ~ 14
2 DENIS J025503.3-470049 BrownD* 02 55 03.6927058871 -47 00 51.356903955 1012.445 -554.031 205.4251 ~ ~ ~     22.921 19.906 17.454 L9 ~ ~ ~ ~ 145
3 Cl* Melotte 22 KPNO 2 BrownD* 03 45 43.1616128256 +25 40 23.239779672 -95.363 -41.319 37.8948 ~ ~ ~         17.36 L0V ~ ~ ~ ~ 127
4 SIPS J0408-1450 BrownD* 04 08 29.0647571976 -14 50 33.607387716 205.653 -111.103 45.566 ~ ~ ~           L1.3V ~ ~ ~ ~ 22
5 2MASSI J0415195-093506 BrownD* 04 15 19.54368 -09 35 06.6732 2193 527 174.34 0.000165 49.6 49.60           T8.0 ~ ~ ~ ~ 165
6 2MASS J07270813-3607327 BrownD* 07 27 08.13360 -36 07 32.7036 ~ ~ ~           ~ ~ ~ ~ ~ 1
7 2MASSI J0727182+171001 BrownD* 07 27 18.24600 +17 10 01.2072 1046 -767 110.14 ~ ~ ~           T7.0 ~ ~ ~ ~ 91
8 2MASSI J0825196+211552 BrownD* 08 25 19.6125672818 +21 15 51.549358145 -504.454 -302.671 92.6006 0.00022 66 66.0       21.97 19.22 L7.5V ~ ~ ~ ~ 124
9 2MASS J08350622+1953050 BrownD* 08 35 06.22944 +19 53 05.0532 -158 -108 ~ ~ ~           L5 ~ ~ ~ ~ 40
10 SDSS J083717.21-000018.0 BrownD* 08 37 17.20032 -00 00 19.3608 -30.5 -175.7 29.8 ~ ~ ~           T1 ~ ~ ~ ~ 51
11 2MASS J10101480-0406499 BrownD* 10 10 14.80704 -04 06 49.9320 -324.2 -17.8 55.0 ~ ~ ~           L6 ~ ~ ~ ~ 61
12 2MASS J10360502-5144235 BrownD* 10 36 05.02584 -51 44 23.5680 ~ ~ ~           ~ ~ ~ ~ ~ 1
13 2MASS J12074717+0244249 BrownD* 12 07 47.17296 +02 44 24.9576 -501.5 126.6 44.8 0.00026 78 77.9           L6.5+T2.5 ~ ~ ~ ~ 66
14 2MASS J12095613-1004008 BrownD* 12 09 56.13096 -10 04 00.8076 268.8 -356.7 47.3 ~ ~ ~           T2+T7.5 ~ ~ ~ ~ 60
15 2MASS J12545393-0122474 BrownD* 12 54 53.9040607346 -01 22 47.399401142 -491.554 110.688 74.1838 0.000013 4.0 4.00           T2e: ~ ~ ~ ~ 153
16 NAME Kelu-1 BrownD* 13 05 40.1642434199 -25 41 05.712165150 -305.371 -27.326 49.0459 0.000021 6.37 6.37         16.85 L2+L3.5 ~ ~ ~ ~ 254
17 2MASS J13444680-7320560 BrownD* 13 44 46.80888 -73 20 56.0940 ~ ~ ~           ~ ~ ~ ~ ~ 1
18 2MASS J15031961+2525196 BrownD* 15 03 19.6109033841 +25 25 19.795679019 87.414 557.780 155.7758 -0.000135 -40.5 -40.50           T5.5 ~ ~ ~ ~ 71
19 2MASSW J1506544+132106 BrownD* 15 06 54.3299045806 +13 21 06.039351151 -1071.073 -11.800 85.4250 -0.000002 -0.68 -0.68           L3 ~ ~ ~ ~ 105
20 2MASS J16241436+0029158 BrownD* 16 24 14.36712 +00 29 15.8172 -373 -9 90.90 -0.000102 -30.7 -30.70           T6V ~ ~ ~ ~ 145
21 2MASS J16322911+1904407 BrownD* 16 32 29.11416 +19 04 40.7136 293 -54 65.60 ~ ~ ~       22.42 19.98 L8V ~ ~ ~ ~ 132
22 SIPS J2130-0845 BrownD* 21 30 44.6489028062 -08 45 20.574092550 350.830 -41.579 37.4739 ~ ~ ~       19.784 17.351 L1 ~ ~ ~ ~ 45
23 2MASS J21373742+0808463 BrownD* 21 37 37.3952876712 +08 08 46.264257535 690.856 85.588 66.3652 ~ ~ ~           L5 ~ ~ ~ ~ 20
24 CFBDS J213926+022023 BrownD* 21 39 26.76936 +02 20 22.6968 485.9 124.8 101.5 -0.000078 -23.3 -23.30           L8.5+T3.5 ~ ~ ~ ~ 90
25 2MASSI J2158045-155009 BrownD* 21 58 04.5716969232 -15 50 09.793729140 45.951 -63.481 43.1094 ~ ~ ~       20.771 18.582 L4 ~ ~ ~ ~ 49
26 2MASS J22393718+1617127 BrownD* 22 39 37.18608 +16 17 12.7500 397.4 234.5 42.9 ~ ~ ~           T3 ~ ~ ~ ~ 15
27 2MASSI J2254188+312349 BrownD* 22 54 18.92016 +31 23 49.8300 68 201 0.000047 14.0 14.00           T5.0 ~ ~ ~ ~ 70

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