2009A&A...493.1149Z

Query : 2009A&A...493.1149Z

2009A&A...493.1149Z - Astronomy and Astrophysics, volume 4931149-1154 (2009/1-3)

The minimum jeans mass, brown dwarf companion IMF, and predictions for detection of y-type dwarfs.

ZUCKERMAN B. and SONG I.

Abstract (from CDS):

Cool L- and T-type objects were discovered first as companions to stars in 1988 and 1995, respectively. A certain example of the even cooler Y-type spectral class (Teff≲500K) has not been seen. Recent infrared-imaging observations of stars and brown dwarfs indicate that substellar companions with large semi-major axes and with masses less than the brown dwarf/giant planet dividing line (∼13.5MJ) are rare. Theoretical considerations of the Jeans mass fragmentation of molecular clouds are consistent with this minimum mass cutoff and also with the semi-major axis (hundreds of AU) characteristic of the lowest mass imaged companions. As a consequence, Y-class companions with large semi-major axes should be scarce around stars <2Gyr old, and also around substellar primaries of all ages. By focusing on brown dwarf companions to young stellar primaries, it is possible to derive a first estimate of the brown dwarf IMF over the entire range of brown dwarf masses (13MJ to 79MJ) - the number of companion brown dwarfs is proportional to the mass to the -1.2±0.2 power.

Abstract Copyright: ∼

Journal keyword(s): stars: planetary systems - stars: low-mass, brown dwarfs

Simbad objects: 45

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Number of rows : 45
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 NAME L 362-29 BC BD* 00 04 34.8671722377 -40 44 06.463544237       19.61 16.88 L5+L5 119 0
2 CFBDS J003402-005206 BD* 00 34 02.7971 -00 52 03.946           T8.5 51 0
3 * 54 Psc PM* 00 39 21.8053928046 +21 15 01.712899720 7.29 6.71 5.88 5.21 4.82 K0.5V 630 1
4 CD-52 381 PM* 01 52 14.6257090872 -52 19 33.184648704   11.836 10.953 10.42 9.825 K2V(e) 67 0
5 HD 13445 PM* 02 10 25.9181700303 -50 49 25.465181208   6.945 6.117     K1.5V 484 1
6 HD 16270 PM* 02 36 00.7758029064 -23 31 16.765791636 10.375 9.406 8.328 7.717 7.208 K3.5Vk: 82 0
7 Cl Melotte 22 OpC 03 46 38.0 +24 10 41           ~ 3679 0
8 V* DH Tau Or* 04 29 41.5525353432 +26 32 58.126559604 15.14 14.62 13.10 13.01   M1Ve 323 0
9 [RRN96] GG Tau B Or* 04 32 30.2766917736 +17 31 30.449809020           M6 57 1
10 HD 42581 PM* 06 10 34.6149358167 -21 51 52.656352926 10.801 9.607 8.125 7.164 6.121 M1V 544 0
11 HD 42581B BD* 06 10 34.80 -21 52 00.0           T6.5 549 0
12 HD 44627 Er* 06 19 12.9130449912 -58 03 15.527294208   10.01 9.205   8.185 K1V(e) 207 1
13 HD 49197 PM* 06 49 21.3348720432 +43 45 32.779840536   7.82 7.32     F5 49 0
14 * pi.01 Cnc SB* 09 12 17.5474052342 +14 59 45.776204103 7.49 7.24 6.51 5.90 5.52 G9V 234 0
15 LP 261-75 LM* 09 51 04.5755715720 +35 58 09.461810208   16.940 15.436 14.713   M4.5Ve 60 1
16 G 196-3 PM* 10 04 21.4627410744 +50 23 13.386435576       11.323   M3.0V 90 0
17 LP 903-20 PM* 10 04 38.7261105618 -33 35 09.524373674       14.14 11.46 M4 24 0
18 HD 89744 PM* 10 22 10.5618854376 +41 13 46.309698444   6.25 5.72     F7V 360 1
19 HD 97334 BY* 11 12 32.3503039560 +35 48 50.688978228   7.02 6.41     G2 306 0
20 CD-33 7795 TT* 11 31 55.2608963280 -34 36 27.203892120   12.97 11.524 11.150 9.150 M2Ve 205 0
21 TWA 27 LM* 12 07 33.4675524840 -39 32 54.016625184     19.95 17.99 15.88 M8IVe 376 0
22 TWA 27B BD* 12 07 33.50 -39 32 54.4           L3 321 0
23 GD 165B BD* 14 24 39.09480 +09 17 10.4352         20.53 L4V 216 0
24 G 124-62 PM* 14 41 35.8329036192 -09 46 38.701925184   12.58 11.80 12.33   dM4.5e 26 0
25 DENIS J144137.2-094558 BD* 14 41 37.1567200536 -09 45 59.229849096       20.030 17.234 L1+L1 61 0
26 G 239-25 PM* 14 42 21.5756362789 +66 03 20.844850251   12.43 10.708 10.383   M3V 89 0
27 HD 130948 BY* 14 50 15.8109853464 +23 54 42.634220112   6.456 5.867     F9IV-V 306 0
28 BD+16 2708B SB* 14 54 29.4185719182 +16 06 08.616294953           M8.5 143 0
29 GJ 570 D BD* 14 57 14.96256 -21 21 47.7504           T8 242 1
30 HD 131977 BY* 14 57 28.0007918772 -21 24 55.727265310 7.89 6.83 5.72 4.74 4.19 K4V 525 0
31 * eta CrB A * 15 23 12.230856 +30 17 17.56212   6.123 5.577     G2V 237 0
32 V* GQ Lup B LM* 15 49 12.05 -35 39 05.1           M9e 165 1
33 V* GQ Lup Or* 15 49 12.1053805848 -35 39 05.058139788 12.19 12.76 11.66 11.15   K7Ve 334 1
34 MCC 760 PM* 16 20 24.7810787707 -04 16 02.298205844   12.09 10.708 10.347   M0V 69 0
35 NAME Oph 11 ** 16 22 25.21392 -24 05 13.9488       19.4 18.98 M9+M9.5 48 0
36 BD-21 4369 Or* 16 29 48.6927879432 -21 52 11.928822636   12.54 11.315   9.740 K2IVe 53 0
37 2MASS J17072343-0558249 ** 17 07 23.43528 -05 58 24.9204       18.9 15.38 M9+L3 36 0
38 SCR J1845-6357 LM* 18 45 05.2532493080 -63 57 47.450109578     17.40 14.99 12.46 M8.5V 77 1
39 * eta Tel PM* 19 22 51.2060774616 -54 25 26.145617376   5.035 5.020   4.99 A0V 228 0
40 * 15 Sge B BD* 20 04 06.2 +17 04 13           L4-5 71 0
41 Wolf 1084 SB* 20 43 19.2623811502 +55 20 53.100443210   16.46   13.9   M5Ve 94 0
42 HD 203030 BY* 21 18 58.2195697224 +26 13 49.960929036   9.206 8.426 8.79   K0V 102 0
43 V* HN Peg BY* 21 44 31.3299461136 +14 46 18.983292600       6.16   G0V+ 561 0
44 * eps Ind PM* 22 03 21.6536261624 -56 47 09.522795714   5.75 4.69     K5V 616 0
45 NAME Carina-near Moving Group MGr ~ ~           ~ 118 0

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