2026ApJ...998...82T

Query : 2026ApJ...998...82T

2026ApJ...998...82T - Astrophys. J., 998, 82 (2026/February-2)

COBIPLANE: A Systematic Search for Compact Binary Millisecond Pulsars at Low Galactic Latitudes.

TURCHETTA M., LINARES M., KOLJONEN K., MILES-PAEZ P.A. and SIMPSON J.A.

Abstract (from CDS):

We present the main results obtained from the Compact Binary Pulsar Search in the Low-Latitude Neighborhood, an optical photometric survey designed to find new “spider” binary millisecond pulsars. We conducted observations targeting 30 unidentified sources from the 4FGL-DR3 Fermi Large Area Telescope catalog, selected for their pulsar-like γ-ray properties. Extending to Galactic latitudes as low as ±3°, this survey reaches closer to the Galactic plane than its predecessor survey, the Compact Binary Pulsar Search. We report the discovery of five optical variables coincident with the localizations of 4FGL J0821.5-1436, 4FGL J1517.9-5233, 4FGL J1639.3-5146, 4FGL J1748.8-3915, and 4FGL J2056.4+3142. These systems show optical flux modulation at the presumed orbital periods of 0.41576(6) days, 0.305(2) days, 0.204(7) days, 0.3(2) days, and 0.4395(1) days, respectively, and photometric temperatures of 4000-6000 K, consistent with the companion stars of the “redback” subtype of spider pulsar binaries. Based on their optical light curve shapes and X-ray properties characteristic for spider systems-namely, a luminosity of 1.5 × 1032(D/3.9 kpc)2 erg s–1 (0.3-10 keV) for 4FGL J1748.8-3915, and upper limits of ∼1031-1033 erg s–1 (0.2-12 keV) for the others-we classify these sources as new spider candidate systems.

Abstract Copyright: © 2026. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): High energy astrophysics - Close binary stars - Millisecond pulsars - Variable stars

Simbad objects: 58

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Number of rows : 58
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 3FGL J0003.4+3100 gam 00 03 37.1 +30 59 23           ~ 11 0
2 2FGL J0048.8-6347 gam 00 48 40.4 -63 47 29           ~ 18 0
3 QSO B0056-572 Bla 00 58 46.5813154752 -56 59 11.469154272   17.91   16.95   ~ 98 1
4 4FGL J0139.5-2228 gam 01 39 35.3 -22 28 40           ~ 7 0
5 1FGL J0212.3+5319 EB* 02 12 10.4774318712 +53 21 38.778250464   15.213 14.677 14.286   ~ 58 0
6 3FGL J0235.7+5647 Bz? 02 35 23.5 +56 50 52           ~ 12 0
7 4FGL J0414.7-4300 gam 04 14 47.4 -43 00 43           ~ 9 0
8 PSO J080.8044-25.5318 G 05 23 13.0748610986 -25 31 54.492620030           ~ 56 0
9 4FGL J0754.9-3953 gam 07 54 57.8 -39 53 42           ~ 9 0
10 4FGL J0821.5-1436 gam 08 21 35.3 -14 36 31           ~ 6 0
11 ATO J125.4319-14.6300 EB* 08 21 43.6600387698 -14 37 48.046817043   16.217 15.592 15.643   ~ 3 0
12 PSR J0838-2827 Psr 08 38 30.15 -28 25 55.5           ~ 49 0
13 4FGL J0906.8-2122 gam 09 06 49.1 -21 22 21           ~ 7 0
14 PSR J1023+0038 Psr 10 23 47.6841824712 +00 38 41.005893516     17.31     GV 470 0
15 PSR J1048+2339 Psr 10 48 43.4339582160 +23 39 53.577436140     19.47     ~ 82 0
16 XSS J12270-4859 Psr 12 27 58.7476831464 -48 53 42.824592960           ~ 321 0
17 PSR J1306-4035 Psr 13 06 56.2808156568 -40 35 23.465480784   18.73   17.99 17.22 ~ 25 0
18 PSR J1311-3430 Psr 13 11 45.7292612136 -34 30 30.294149760   21.0   18.8   ~ 181 1
19 2FGL J1346.0-2605 gam 13 45 55.6 -26 12 42           ~ 19 0
20 2FGL J1400.2-2412 gam 14 00 10.16 -24 09 57.8           ~ 20 0
21 Gaia DR3 5888147588733054208 EB* 15 17 42.9376526926 -52 32 20.638657855           ~ 2 0
22 1FGL J1518.0-5233 gam 15 18 05.51 -52 33 40.7           ~ 16 0
23 2FGL J1612.0+1403 AGN 16 12 07.5 +14 07 00           ~ 23 0
24 PSR J1622-0315 Psr 16 22 59.6408643864 -03 15 37.303251262           ~ 48 0
25 PSR J1628-3205 Psr 16 28 07.0056152 -32 05 48.966980           ~ 66 0
26 Gaia DR3 5931215012555755008 EB* 16 39 20.7284085167 -51 45 03.629386999           ~ 2 0
27 2EG J1648-5042 gam 16 39 23.5 -51 46 09           ~ 39 0
28 TGSSADR J163923.8-514634 Rad 16 39 23.8 -51 46 34           ~ 2 0
29 2AGL J1703-5705 gam 17 02 36.38 -56 53 33.8           ~ 31 0
30 PSR J1723-2837 Psr 17 23 23.1937506912 -28 37 57.210408048   16.81 15.77 15.71   ~ 105 0
31 4FGL J1748.8-3915 gam 17 48 49.2 -39 15 09           ~ 3 0
32 Gaia DR3 5958230425510812928 * 17 48 53.7488082251 -39 17 44.792484439           ~ 1 0
33 2SXPS J174854.0-391739 X 17 48 54.08 -39 17 40.0           ~ 1 0
34 PSR J1803-6707 Psr 18 03 04.2584772678 -67 07 36.053782916           ~ 15 0
35 2FGL J1808.3-3356 gam 18 08 24.4 -33 58 54           ~ 22 0
36 PSR J1824-0621 Psr 18 24 15.81954 -06 21 56.7918           ~ 7 0
37 3FHL J1824.3-0621 Bz? 18 24 16.3 -06 21 27           ~ 12 0
38 1FGL J1833.2-6502 gam 18 31 06.6 -65 03 57           ~ 20 0
39 1FGL J1908.5-0138 gam 19 08.8 -01 31           ~ 22 0
40 PSR J1910-5320 Psr 19 10 49.1174687189 -53 20 57.011842839           ~ 22 0
41 3FGL J2026.8+2813 gam 20 27 03.9 +28 11 24           ~ 11 0
42 PSR J2039-5617 Psr 20 39 34.9609502672 -56 17 09.033104197           ~ 84 0
43 2FGL J2041.2+4735 gam 20 41 17.3 +47 35 38           ~ 17 0
44 PSR J2055+1545 Psr 20 55 47.8269499741 +15 45 21.250184929           ~ 8 0
45 4FGL J2056.4+3142 gam 20 56 28.8 +31 42 07           ~ 6 0
46 ZTF J205634.59+314236.9 EB* 20 56 34.6045732934 +31 42 37.022624575           ~ 2 0
47 1FGL J2112.5-3044 gam 21 12 33.6 -30 43 45           ~ 30 0
48 4FGL J2116.2+3701 gam 21 16 14.3 +37 01 33           ~ 6 0
49 PSR J2116+3701 Psr 21 16 14.304 +37 01 31.13           ~ 4 0
50 1FGL J2116.8+3729 gam 21 17 58.1 +37 29 03           ~ 20 0
51 PSR J2129-04 Psr 21 29 45.0469239408 -04 29 06.973600236     16.68     ~ 100 0
52 1FGL J2134.3-6429 gam 21 33 10.8 -64 32 18           ~ 23 0
53 PSR J2215+51 Psr 22 15 32.6869149432 +51 35 36.400854912           ~ 176 0
54 3FGL J2220.6-6833 BLL 22 19 47.3 -68 37 02           ~ 13 0
55 2FGL J2221.0+6307 gam 22 20 53.7 +63 19 07           ~ 14 0
56 4FGL J2241.2+4303 gam 22 41 12.1 +43 03 30           ~ 6 0
57 3FGL J2250.6+3308 gam 22 50 33.7 +33 05 56           ~ 14 0
58 PSR J2339-0533 Psr 23 39 38.7412778376 -05 33 05.108592528     18.48     ~ 149 0

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