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

To see the description for a column hover the cursor over it, click on the "?" next to the column name, or click on "Column Descriptions" above. Click on a column name to sort by that column.
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 [?]
MOA-2007-BLG-1920.620.220.620.331000400NN----0.060.000010.0002---137--microlensing_detection;planetary_companion
2MASSJ1101192-773238241.9-1440-16810NNM7M8OY0.0500.0250.50195002ChaI212144,64,65-
ChaHa81.30.2--16810NNM6-ON0.10.0190.2015913ChaI97,12312121RV;sep=asini;massB=M2sini
epsilonIndiB2.60.0173223.60.01YNT1T6IY0.0450.0270.60221300epIndiA161640triple(epsilonIndiA)
2MASSJ1311391+8032227.71.32676295NNM7.5M8ON0.0890.0870.9872-field1742,11517-
2MASSJ2147436+1431317.0-322321.8-NNL0L2-N0.0840.0780.9365-field4,13424-
DENIS-PJ100428.3-1146486.80.1146346.8-NNM9.5L0.5ON0.0800.0760.9563-field44,1154-
2MASSWJ2101154+1756587.80.9234333.23.8YNL7L8ON0.0680.0650.9684-field4,133970-
2MASSJ1449378+2355378.5-134363.7-NNL0L3ON0.0840.0750.8988-field4,13394-
DENIS-PJ020529.0-1159259.20.85104018.00.8YNL5L6ON0.070.071.00105-field1252,11541candidate_triple(DENIS-PJ020529.0-115925BC)
2MASSJ1127534+7411078.41.52468346NNM8M9ON0.0920.0870.9580-field174217-
2MASSJ1146345+2230537.90.2290327.20.6YNL2L2ON0.0550.0551.0094-field7,1252,11541-
2MASSJ0147328-4954486.31.2190-336NNM8:L2:ON0.0840.0800.9555-field879387-
SDSS-J102109.69-030420.15.00.7172524.56.6YNT1T5IN0.060.050.8448-field697270-
2MASSWJ1750129+4424044.91.01585316NNM7.5L0ON0.0950.0840.8836-field9429-
2MASSsJ0850359+1057164.7-160-29.62.3YNL6T:ON0.040.030.7539-field77,5241,70-
Kelu-15.40.2291218.70.7YNL2L4ON0.0600.0550.9252-field2411,5241-
2MASSJ0429184-3123565.81.15312112NNM7.5L1ON0.0940.0790.8448-field23,874323-
2MASSJ0025036+47591910.22.03302316NNL4L4ON0.0480.0470.98149-field878987-
2MASSJ2152260+0937576.01.2250224.25.0NNL6:L6:ON0.0750.0751.0056-field879387-
2MASSJ0253202+271333------NNM8M8:ON0.0920.092?1?--field842-SB2
DENIS-PJ1228.2-15476.40.22511020.20.8YYL6L6ON0.0600.0601.0044-field11,947141-
2MASSJ0915341+04220410.82.2730214.83.0NNL7L7ON0.0720.0721.00132-field879387-
2MASSJ1534498-2952272.30.51713413.60.2YYT5T5IN0.0290.0270.94150.8field5,13073,13038-
2MASSJ12583501+40130836700800633805010513NNM6M7IY0.1050.0910.8717520241000-5000field122122122secondary_object_is_2MASSJ12583798+4014017
2MASSJ03202839-04463588.3-0.33-253NNM8.5T5IN0.0860.0680.790.67>2000field125,134,13913443SB2;projected_and_angular_sep_are_upper_limits
2MASSJ0126555-502239510040081860100635NNM6.5M8IY0.0950.0920.971000000200-2000field116,131116116could_be_member_of_TWA
2MASSJ14044941-31593293.10.4133.60.6233NNT1T5ON0.040.030.7532-field133133133-
HD65216B5.90.41671135.60.9YNM7.5L2.5IN0.0890.0780.8850-field14314349Triple_system_with_HD65216A(G5_planet_host_star)
2MASSJ22551861-57130561.60.21384111.63.1NNL6L8OY0.0750.0710.957.5-field138138138-
LSR1610-00400.60.28.910.3132.30.1YYM6pecL/TON0.10.060.601.662-field135136135-
Koenigstuhl-118001707776070232NNM6:M9.5OY0.1030.0790.77170000>1000field111111,112,113111companion:DENIS-PJ0021.0-4244;(possible_triple_system)
DENIS-J055146.0-443412.2220.044.322005010020NNM8.5L0IY0.0850.0790.9311500-field272727-
2MASSJ2331016-04061815.00.4573826.20.6YNM8.5L7ON0.0930.0670.72205-field4,13,174249-
DENIS-PJ144137.3-09455914.3-420-347NNL1L1ON0.0720.0721.00201-field4,483980triple(G124-62)
2MASSJ2206228-2047054.50.8168726.74.5NNM8M8ON0.0920.0910.9931-field174217-
2MASSJ1707234-05582415.22.71010170151NNM9L3IY0.0830.0770.93210-field1026767-
2MASSJ1520022-44224222211741619-NNL1.5L4.5IY0.0820.0770.94400-field15,10810815,108-
DENIS-J220002.0-303832.938.23109060352NNM8L0OY0.0850.0830.98813-field666666-
CFHT-Pl-1834.6-330-105-NNM8M8OY0.0900.0901.00679-field4,19,10719,10719-
Gl337C10.90.75303020.50.4NNL8T:ON0.0550.0551.00152-field3050,6949quadruple(Gl337A
WT4605.91.8511111.63.5NNM6L1ON0.120.0750.6240-field252525-
SDSS-J092615.38+584720.92.60.5706387NNT4:T4:IN0.070.060.8717-field697169-
2MASSJ1239272+5515374.50.1211321.3-NNL5L5-N0.0710.0711.0035-field4,13394-
2MASSWJ0746425+2000322.5-220-12.20.04YNL0L1.5ON0.0850.0660.7811300?field7,4,1720,39,71,11541-
2MASSWJ1430436+2915412.60.188329.4-NNL2:L3:ON0.0760.0750.9915-field4434-
2MASSJ0004348-4044061.00.3876153YNL4.5L4.5ON0.0680.0681.004-field8335,5283triple(GJ1001A)
2MASSJ0920122+3517421.5-70-20.83.0NNL6.5T:ON0.0680.0681.006-field739,69,877-
2MASSJ1047138+4026492.80.51228234NNM8L0ON0.0920.0840.9115-field17,535317triple(LP213-67;M6.5)
2MASSJ1728114+3948592.7-131320-NNL7T:ON0.0690.0660.9616-field4,1313,394-
SDSS-J042348.57-041403.52.50.07164215.20.4YNL6.5T2ON0.060.050.7819-field6843,7170-
HD130948B2.40.1134517.90.3YNL4L4IY0.0700.0600.8614-field62649triple(HD130948A)
2MASSJ1847034+5522431.90.3825234NNM7M7.5ON0.0980.0940.968-field234323-
2MASSJ0518599-2828371.80.55112346NNL6:T4:ON0.070.050.7410-field697169-
2MASSJ2132114+1341581.80.3664284NNL5L7.5IN0.0780.0750.9610-field11489,114114-
2MASSJ1112256+3548131.50.370321.74.2YNL4.5L6ON0.0730.0700.967-field43940triple(Gl417A)
2MASSJ2252107-1730131.90.4140213.63.2NNL6:T2:IN0.0750.0650.8710-field323232-
LP349-251.30.21251010.11.2NNM8M9ON0.0900.0850.944-field314231-
DENIS-PJ035726.9-4417302.2-98322.2-NNM9L1.5-Y0.0850.080.9111-field4,131154-
2MASSJ0700366+3157272.10.7170-12.24.0YNL3.5L6:ON0.0710.0600.8512-field874387-
LSPM1735+26343.20.3290-111NNM9:M9:ON0.0820.0740.9020-field999999-
LHS2397a3.00.1207714.60.4YNM8L7.50N0.0900.0680.7618-field1042,7836,84-
2MASSJ2140293+1625184.00.7155525.64.4NNM9L2ON0.0920.0780.8527-field174217-
2MASSJ1426316+1557014.00.7152626.14.5NNM8L1.5ON0.0880.0760.8627-field1742,11517-
SDSS-J153417.05+161546.14.0-110536-NNT1.5T5.5ON0.050.040.8028-field989898-
LHS190140.3275511.01.1NYM6.5M7.5ON0.0850.0820.9620-field25109,2525-
2MASSJ1553022+1532364.20.73495122NNT6.5T7IN0.0400.0350.8844-field697369-
SCR1845-63574.50.03117033.850.02YNM8.5T6IN0.090.040.4437-field100,118101,118100,119-
2MASSJ0952219-192431------NNM7M7:ON0.0980.098?1?--field843-SB2
2MASSJ2113029-100941----12.52.5NNM6M6ON0.0850.0851?--field284228SB2
2MASSJ1225543-2739463.80.1282513.40.4YNT6T8IN0.0330.0240.7343-field55,9138-
2MASSJ0856479+2235183.4-98934.7-NNL5:L8:ON0.0710.0640.9024-field4434candidate
LHS1070B3.40.2446297.40.3YYM8.5M9ON0.0700.0680.9716-field187418,36quadruple(LHS1070AD)
SDSS-J080531.84+481233.0----14.62.5NNL4.5T5IN0.0780.0690.88--field117117117Binary_inferred_from_spectral_template_modelling
2MASSWJ1017075+1308393.40.51043335NNL2L2ON0.0760.0761.0023-field4434-
SDSS2335583-0013043.5-57362-NNL1:L4:ON0.0790.0740.9424-field444-
2MASSJ1600054+1708323.5-57360.6-NNL1L3ON0.0780.0750.9623-field4,13394-
LP475-8558.51.52945295NNM7.5M9.5ON0.0910.0800.8885625Hyades9429-
LP415-203.60.61198305NNM7M9.5IN0.0950.0790.8322625Hyades9429-
2MASSJ1622252-2405142435519432212525NNM9M9.5IY0.0170.0150.88200005Oph103,106,110104,103,106105-
2MASSJ1623361-240221212431696512525NNM5M5.5IN0.0960.0700.7380005Oph106106105
2MASSJ0535218-0546080.04---43555NYM6.5M6.5IY0.0540.0340.630.02681Orion858585SB2
PPl150.03---1344NYM7M8ON0.0700.0600.860.0159120Pleiades16047SB2
IPMBD2512.60.59431343NNM7L4-N0.0630.0390.62197120Pleiades14,611447-
CFHT-Pl-128.30.36221343NNM8L4-N0.0540.0380.70111120Pleiades146247-
IPMBD297.80.65841343NNL1L4-N0.0450.0380.84106120Pleiades14-47-
DENIS-PJ185950.9-3706327.7-60-12911NNL0L3ON0.0840.0760.90765R-CrA202057-
MHO-Tau-86.21.14481423NNM6M6.5ON0.100.0700.70532Taurus4695,466-
CFHT-Tau-732122421423NNM6M7?ON0.070.060.867102Taurus1401416Needs_pm_confirmation;observed_in_only_one_filter
CFHT-Tau-1782257521423NNM5.5M8?ON0.10.060.6026302Taurus1401416Needs_pm_confirmation;observed_in_only_one_filter
CFHT-Tau-1831121621423NNM6M9?ON0.10.060.606102Taurus1401416Needs_pm_confirmation;observed_in_only_one_filter
2MASSJ1207334-39325441.14.77768536NNM8.5L:IY0.0240.0040.1722508TWA22,632234-
UScoCTIO-5517.70.312211452NNM5.5M6ON0.100.0700.702555UpSco299245-
UScoCTIO-1094.90.33421452NNM6M7.5ON0.0700.0400.57465UpSco299245candidate
UScoCTIO-6610.20.27011452NNM6M6ON0.0700.0701.001225UpSco299245-
GJ569B0.900.0110319.80.2YYM9.0M9.0IY0.0710.0540.762.4100?UrsMajMG2,3,33,7575,11549triple(GJ569A);possible_quadruple_system
USco-CTIO-1086701746001004502NNM7M9.5IY0.0570.0130.23927005USco12412445-