Very Low Mass Binaries Archive

This page last updated on Tuesday, July 28, 2009. There are currently 99 VLM binaries listed.

This Archive contains an up-to-date list of all the stellar (and sub-stellar) binary systems with total estimated mass < 0.2 M_solar known in the literature. It targets both theorists and observers interested in understanding the empirical data of this subject. In most cases binary parameters are extracted directly from refereed journals referenced in the Table. Additional background information can be found in:

Not Alone: Tracing the Origins of Very-Low-Mass Stars and Brown Dwarfs Through Multiplicity Studies (Burgasser, A. J., Reid, I. N., Siegler, N., Close, L., Allen, P., Lowrance, P., Gizis, J. 2006, chapter in Protostars and Planets V) (Download in postscript, PDF)

Please send suggestions, corrections, and updates to nicholas.siegler at jpl.nasa.gov. If time, I will link the star names to ADS. If this table has been useful in your research, we suggest an acknowledgment of the form "This publication has made use of the Very-Low-Mass Binaries Archive housed at http://www.vlmbinaries.org and maintained by Nick Siegler, Chris Gelino, and Adam Burgasser."

Table | References | Column Descriptions | Export to: Comma-separated (Excel) or Tab-separated (ASCII)

name [?]	projected sep (AU) [?]	projected sep error (AU) [?]	angular sep (mas) [?]	angular error (mas) [?]	dist (pc) [?]	dist error (pc) [?]	plx (Y/N) [?]	sma (Y/N) [?]	SpT A [?]	SpT B [?]	SpT region (O/I) [?]	resolv. spectra (Y/N) [?]	est mass_A (Msun) [?]	est mass_B (Msun) [?]	q [?]	P (yr) [?]	age (Myr) [?]	location [?]	bin. ref. [?]	SpT ref. [?]	dist. ref. [?]	comments [?]
2MASSJ0004348-404406	1.0	0.3	87	6	15	3	Y	N	L4.5	L4.5	O	N	0.068	0.068	1.00	4	-	field	83	35,52	83	triple(GJ1001A)
2MASSJ0025036+475919	10.2	2.0	330	2	31	6	N	N	L4	L4	O	N	0.048	0.047	0.98	149	-	field	87	89	87	-
2MASSJ0126555-502239	5100	400	81860	100	63	5	N	N	M6.5	M8	I	Y	0.095	0.092	0.97	1000000	200-2000	field	116,131	116	116	could_be_member_of_TWA
2MASSJ0147328-495448	6.3	1.2	190	-	33	6	N	N	M8:	L2:	O	N	0.084	0.080	0.95	55	-	field	87	93	87	-
2MASSJ0253202+271333	-	-	-	-	-	-	N	N	M8	M8:	O	N	0.092	0.092?	1?	-	-	field	8	42	-	SB2
2MASSJ03202839-0446358	8.3	-	0.33	-	25	3	N	N	M8.5	T5	I	N	0.086	0.068	0.79	0.67	>2000	field	125,134,139	134	43	SB2;projected_and_angular_sep_are_upper_limits
2MASSJ0429184-312356	5.8	1.1	531	2	11	2	N	N	M7.5	L1	O	N	0.094	0.079	0.84	48	-	field	23,87	43	23	-
2MASSJ0518599-282837	1.8	0.5	51	12	34	6	N	N	L6:	T4:	O	N	0.07	0.05	0.74	10	-	field	69	71	69	-
2MASSJ0535218-054608	0.04	-	-	-	435	55	N	Y	M6.5	M6.5	I	Y	0.054	0.034	0.63	0.0268	1	Orion	85	85	85	SB2
2MASSJ0700366+315727	2.1	0.7	170	-	12.2	4.0	Y	N	L3.5	L6:	O	N	0.071	0.060	0.85	12	-	field	87	43	87	-
2MASSJ0856479+223518	3.4	-	98	9	34.7	-	N	N	L5:	L8:	O	N	0.071	0.064	0.90	24	-	field	4	43	4	candidate
2MASSJ0915341+042204	10.8	2.2	730	2	14.8	3.0	N	N	L7	L7	O	N	0.072	0.072	1.00	132	-	field	87	93	87	-
2MASSJ0920122+351742	1.5	-	70	-	20.8	3.0	N	N	L6.5	T:	O	N	0.068	0.068	1.00	6	-	field	7	39,69,87	7	-
2MASSJ0952219-192431	-	-	-	-	-	-	N	N	M7	M7:	O	N	0.098	0.098?	1?	-	-	field	8	43	-	SB2
2MASSJ1047138+402649	2.8	0.5	122	8	23	4	N	N	M8	L0	O	N	0.092	0.084	0.91	15	-	field	17,53	53	17	triple(LP213-67;M6.5)
2MASSJ1101192-773238	241.9	-	1440	-	168	10	N	N	M7	M8	O	Y	0.050	0.025	0.50	19500	2	ChaI	21	21	44,64,65	-
2MASSJ1112256+354813	1.5	0.3	70	3	21.7	4.2	Y	N	L4.5	L6	O	N	0.073	0.070	0.96	7	-	field	4	39	40	triple(Gl417A)
2MASSJ1127534+741107	8.4	1.5	246	8	34	6	N	N	M8	M9	O	N	0.092	0.087	0.95	80	-	field	17	42	17	-
2MASSJ1146345+223053	7.9	0.2	290	3	27.2	0.6	Y	N	L2	L2	O	N	0.055	0.055	1.00	94	-	field	7,12	52,115	41	-
2MASSJ1207334-393254	41.1	4.7	776	8	53	6	N	N	M8.5	L:	I	Y	0.024	0.004	0.17	2250	8	TWA	22,63	22	34	-
2MASSJ1225543-273946	3.8	0.1	282	5	13.4	0.4	Y	N	T6	T8	I	N	0.033	0.024	0.73	43	-	field	5	5,91	38	-
2MASSJ1239272+551537	4.5	0.1	211	3	21.3	-	N	N	L5	L5	-	N	0.071	0.071	1.00	35	-	field	4,13	39	4	-
2MASSJ1311391+803222	7.7	1.3	267	6	29	5	N	N	M7.5	M8	O	N	0.089	0.087	0.98	72	-	field	17	42,115	17	-
2MASSJ1426316+155701	4.0	0.7	152	6	26.1	4.5	N	N	M8	L1.5	O	N	0.088	0.076	0.86	27	-	field	17	42,115	17	-
2MASSJ1449378+235537	8.5	-	134	3	63.7	-	N	N	L0	L3	O	N	0.084	0.075	0.89	88	-	field	4,13	39	4	-
2MASSJ1520022-442242	22	2	1174	16	19	-	N	N	L1.5	L4.5	I	Y	0.082	0.077	0.94	400	-	field	15,108	108	15,108	-
2MASSJ1534498-295227	2.3	0.5	171	34	13.6	0.2	Y	Y	T5	T5	I	N	0.029	0.027	0.94	15	0.8	field	5,130	73,130	38	-
2MASSJ1553022+153236	4.2	0.7	349	5	12	2	N	N	T6.5	T7	I	N	0.040	0.035	0.88	44	-	field	69	73	69	-
2MASSJ1600054+170832	3.5	-	57	3	60.6	-	N	N	L1	L3	O	N	0.078	0.075	0.96	23	-	field	4,13	39	4	-
2MASSJ1622252-240514	243	55	1943	22	125	25	N	N	M9	M9.5	I	Y	0.017	0.015	0.88	20000	5	Oph	103,106,110	104,103,106	105	-
2MASSJ1623361-240221	212	43	1696	5	125	25	N	N	M5	M5.5	I	N	0.096	0.070	0.73	8000	5	Oph	106	106	105
2MASSJ1707234-055824	15.2	2.7	1010	170	15	1	N	N	M9	L3	I	Y	0.083	0.077	0.93	210	-	field	102	67	67	-
2MASSJ1728114+394859	2.7	-	131	3	20	-	N	N	L7	T:	O	N	0.069	0.066	0.96	16	-	field	4,13	13,39	4	-
2MASSJ1847034+552243	1.9	0.3	82	5	23	4	N	N	M7	M7.5	O	N	0.098	0.094	0.96	8	-	field	23	43	23	-
2MASSJ2113029-100941	-	-	-	-	12.5	2.5	N	N	M6	M6	O	N	0.085	0.085	1?	-	-	field	28	42	28	SB2
2MASSJ2132114+134158	1.8	0.3	66	4	28	4	N	N	L5	L7.5	I	N	0.078	0.075	0.96	10	-	field	114	89,114	114	-
2MASSJ2140293+162518	4.0	0.7	155	5	25.6	4.4	N	N	M9	L2	O	N	0.092	0.078	0.85	27	-	field	17	42	17	-
2MASSJ2147436+143131	7.0	-	322	3	21.8	-	N	N	L0	L2	-	N	0.084	0.078	0.93	65	-	field	4,13	42	4	-
2MASSJ2152260+093757	6.0	1.2	250	2	24.2	5.0	N	N	L6:	L6:	O	N	0.075	0.075	1.00	56	-	field	87	93	87	-
2MASSJ2206228-204705	4.5	0.8	168	7	26.7	4.5	N	N	M8	M8	O	N	0.092	0.091	0.99	31	-	field	17	42	17	-
2MASSJ2252107-173013	1.9	0.4	140	2	13.6	3.2	N	N	L6:	T2:	I	N	0.075	0.065	0.87	10	-	field	32	32	32	-
2MASSJ2331016-040618	15.0	0.4	573	8	26.2	0.6	Y	N	M8.5	L7	O	N	0.093	0.067	0.72	205	-	field	4,13,17	42	49	-
2MASSJ12583501+4013083	6700	800	63380	50	105	13	N	N	M6	M7	I	Y	0.105	0.091	0.87	1752024	1000-5000	field	122	122	122	secondary_object_is_2MASSJ12583798+4014017
2MASSJ14044941-3159329	3.1	0.4	133.6	0.6	23	3	N	N	T1	T5	O	N	0.04	0.03	0.75	32	-	field	133	133	133	-
2MASSJ22551861-5713056	1.6	0.2	138	41	11.6	3.1	N	N	L6	L8	O	Y	0.075	0.071	0.95	7.5	-	field	138	138	138	-
2MASSsJ0850359+105716	4.7	-	160	-	29.6	2.3	Y	N	L6	T:	O	N	0.04	0.03	0.75	39	-	field	7	7,52	41,70	-
2MASSWJ0746425+200032	2.5	-	220	-	12.2	0.04	Y	N	L0	L1.5	O	N	0.085	0.066	0.78	11	300?	field	7,4,17	20,39,71,115	41	-
2MASSWJ1017075+130839	3.4	0.5	104	3	33	5	N	N	L2	L2	O	N	0.076	0.076	1.00	23	-	field	4	43	4	-
2MASSWJ1430436+291541	2.6	0.1	88	3	29.4	-	N	N	L2:	L3:	O	N	0.076	0.075	0.99	15	-	field	4	43	4	-
2MASSWJ1750129+442404	4.9	1.0	158	5	31	6	N	N	M7.5	L0	O	N	0.095	0.084	0.88	36	-	field	9	42	9	-
2MASSWJ2101154+175658	7.8	0.9	234	3	33.2	3.8	Y	N	L7	L8	O	N	0.068	0.065	0.96	84	-	field	4,13	39	70	-
CFHT-Pl-12	8.3	0.3	62	2	134	3	N	N	M8	L4	-	N	0.054	0.038	0.70	111	120	Pleiades	14	62	47	-
CFHT-Pl-18	34.6	-	330	-	105	-	N	N	M8	M8	O	Y	0.090	0.090	1.00	679	-	field	4,19,107	19,107	19	-
CFHT-Tau-7	32	1	224	2	142	3	N	N	M6	M7?	O	N	0.07	0.06	0.86	710	2	Taurus	140	141	6	Needs_pm_confirmation;observed_in_only_one_filter
CFHT-Tau-17	82	2	575	2	142	3	N	N	M5.5	M8?	O	N	0.1	0.06	0.60	2630	2	Taurus	140	141	6	Needs_pm_confirmation;observed_in_only_one_filter
CFHT-Tau-18	31	1	216	2	142	3	N	N	M6	M9?	O	N	0.1	0.06	0.60	610	2	Taurus	140	141	6	Needs_pm_confirmation;observed_in_only_one_filter
ChaHa8	1.3	0.2	-	-	168	10	N	N	M6	-	O	N	0.1	0.019	0.20	1591	3	ChaI	97,123	121	21	RV;sep=asini;massB=M2sini
DENIS-J055146.0-443412.2	220.0	44.3	2200	50	100	20	N	N	M8.5	L0	I	Y	0.085	0.079	0.93	11500	-	field	27	27	27	-
DENIS-J220002.0-303832.9	38.2	3	1090	60	35	2	N	N	M8	L0	O	Y	0.085	0.083	0.98	813	-	field	66	66	66	-
DENIS-PJ020529.0-115925	9.2	0.8	510	40	18.0	0.8	Y	N	L5	L6	O	N	0.07	0.07	1.00	105	-	field	12	52,115	41	candidate_triple(DENIS-PJ020529.0-115925BC)
DENIS-PJ035726.9-441730	2.2	-	98	3	22.2	-	N	N	M9	L1.5	-	Y	0.085	0.08	0.91	11	-	field	4,13	115	4	-
DENIS-PJ1228.2-1547	6.4	0.2	251	10	20.2	0.8	Y	Y	L6	L6	O	N	0.060	0.060	1.00	44	-	field	11,94	71	41	-
DENIS-PJ100428.3-114648	6.8	0.1	146	3	46.8	-	N	N	M9.5	L0.5	O	N	0.080	0.076	0.95	63	-	field	4	4,115	4	-
DENIS-PJ144137.3-094559	14.3	-	420	-	34	7	N	N	L1	L1	O	N	0.072	0.072	1.00	201	-	field	4,48	39	80	triple(G124-62)
DENIS-PJ185950.9-370632	7.7	-	60	-	129	11	N	N	L0	L3	O	N	0.084	0.076	0.90	76	5	R-CrA	20	20	57	-
epsilonIndiB	2.6	0.01	732	2	3.6	0.01	Y	N	T1	T6	I	Y	0.045	0.027	0.60	22	1300	epIndiA	16	16	40	triple(epsilonIndiA)
GJ569B	0.90	0.01	103	1	9.8	0.2	Y	Y	M9.0	M9.0	I	Y	0.071	0.054	0.76	2.4	100?	UrsMajMG	2,3,33,75	75,115	49	triple(GJ569A);possible_quadruple_system
Gl337C	10.9	0.7	530	30	20.5	0.4	N	N	L8	T:	O	N	0.055	0.055	1.00	152	-	field	30	50,69	49	quadruple(Gl337A
HD65216B	5.9	0.4	167	11	35.6	0.9	Y	N	M7.5	L2.5	I	N	0.089	0.078	0.88	50	-	field	143	143	49	Triple_system_with_HD65216A(G5_planet_host_star)
HD130948B	2.4	0.1	134	5	17.9	0.3	Y	N	L4	L4	I	Y	0.070	0.060	0.86	14	-	field	6	26	49	triple(HD130948A)
IPMBD25	12.6	0.5	94	3	134	3	N	N	M7	L4	-	N	0.063	0.039	0.62	197	120	Pleiades	14,61	14	47	-
IPMBD29	7.8	0.6	58	4	134	3	N	N	L1	L4	-	N	0.045	0.038	0.84	106	120	Pleiades	14	-	47	-
Kelu-1	5.4	0.2	291	2	18.7	0.7	Y	N	L2	L4	O	N	0.060	0.055	0.92	52	-	field	24	11,52	41	-
Koenigstuhl-1	1800	170	77760	70	23	2	N	N	M6:	M9.5	O	Y	0.103	0.079	0.77	170000	>1000	field	111	111,112,113	111	companion:DENIS-PJ0021.0-4244;(possible_triple_system)
LHS1070B	3.4	0.2	446	29	7.4	0.3	Y	Y	M8.5	M9	O	N	0.070	0.068	0.97	16	-	field	18	74	18,36	quadruple(LHS1070AD)
LHS1901	4	0.3	275	5	11.0	1.1	N	Y	M6.5	M7.5	O	N	0.085	0.082	0.96	20	-	field	25	109,25	25	-
LHS2397a	3.0	0.1	207	7	14.6	0.4	Y	N	M8	L7.5	0	N	0.090	0.068	0.76	18	-	field	10	42,78	36,84	-
LP349-25	1.3	0.2	125	10	10.1	1.2	N	N	M8	M9	O	N	0.090	0.085	0.94	4	-	field	31	42	31	-
LP415-20	3.6	0.6	119	8	30	5	N	N	M7	M9.5	I	N	0.095	0.079	0.83	22	625	Hyades	9	42	9	-
LP475-855	8.5	1.5	294	5	29	5	N	N	M7.5	M9.5	O	N	0.091	0.080	0.88	85	625	Hyades	9	42	9	-
LSPM1735+2634	3.2	0.3	290	-	11	1	N	N	M9:	M9:	O	N	0.082	0.074	0.90	20	-	field	99	99	99	-
LSR1610-0040	0.6	0.2	8.91	0.31	32.3	0.1	Y	Y	M6pec	L/T	O	N	0.1	0.06	0.60	1.662	-	field	135	136	135	-
MHO-Tau-8	6.2	1.1	44	8	142	3	N	N	M6	M6.5	O	N	0.10	0.070	0.70	53	2	Taurus	46	95,46	6	-
MOA-2007-BLG-192	0.62	0.22	0.62	0.33	1000	400	N	N	-	-	-	-	0.06	0.00001	0.0002	-	-	-	137	-	-	microlensing_detection;planetary_companion
PPl15	0.03	-	-	-	134	4	N	Y	M7	M8	O	N	0.070	0.060	0.86	0.0159	120	Pleiades	1	60	47	SB2
SCR1845-6357	4.5	0.03	1170	3	3.85	0.02	Y	N	M8.5	T6	I	N	0.09	0.04	0.44	37	-	field	100,118	101,118	100,119	-
SDSS-J042348.57-041403.5	2.5	0.07	164	2	15.2	0.4	Y	N	L6.5	T2	O	N	0.06	0.05	0.78	19	-	field	68	43,71	70	-
SDSS-J080531.84+481233.0	-	-	-	-	14.6	2.5	N	N	L4.5	T5	I	N	0.078	0.069	0.88	-	-	field	117	117	117	Binary_inferred_from_spectral_template_modelling
SDSS-J092615.38+584720.9	2.6	0.5	70	6	38	7	N	N	T4:	T4:	I	N	0.07	0.06	0.87	17	-	field	69	71	69	-
SDSS-J102109.69-030420.1	5.0	0.7	172	5	24.5	6.6	Y	N	T1	T5	I	N	0.06	0.05	0.84	48	-	field	69	72	70	-
SDSS-J153417.05+161546.1	4.0	-	110	5	36	-	N	N	T1.5	T5.5	O	N	0.05	0.04	0.80	28	-	field	98	98	98	-
SDSS2335583-001304	3.5	-	57	3	62	-	N	N	L1:	L4:	O	N	0.079	0.074	0.94	24	-	field	4	4	4	-
USco-CTIO-108	670	17	4600	100	450	2	N	N	M7	M9.5	I	Y	0.057	0.013	0.23	92700	5	USco	124	124	45	-
UScoCTIO-55	17.7	0.3	122	1	145	2	N	N	M5.5	M6	O	N	0.10	0.070	0.70	255	5	UpSco	29	92	45	-
UScoCTIO-66	10.2	0.2	70	1	145	2	N	N	M6	M6	O	N	0.070	0.070	1.00	122	5	UpSco	29	92	45	-
UScoCTIO-109	4.9	0.3	34	2	145	2	N	N	M6	M7.5	O	N	0.070	0.040	0.57	46	5	UpSco	29	92	45	candidate
WT460	5.9	1.8	511	1	11.6	3.5	N	N	M6	L1	O	N	0.12	0.075	0.62	40	-	field	25	25	25	-

Very Low Mass Binaries Archive

Table of All Known Very Low Mass Binary Systems (Mtotal < 0.2 Msolar)

Table of All Known Very Low Mass Binary Systems (M_total < 0.2 M_solar)