A search for pre-substellar cores and proto-brown dwarf candidates in Taurus: multiwavelength analysis in the B213-L1495 clouds

被引：17

作者：

Palau, Aina ^{[1
]}

de Gregorio-Monsalvo, I. ^{[2
,3
]}

Morata, O. ^{[4
]}

Stamatellos, D. ^{[5
]}

Huelamo, N. ^{[6
]}

Eiroa, C. ^{[7
]}

Bayo, A. ^{[2
]}

Morales-Calderon, M. ^{[8
]}

Bouy, H. ^{[6
]}

Ribas, A. ^{[9
]}

Asmus, D. ^{[10
]}

Barrado, D. ^{[6
,11
]}

机构：

[1] Fac Ciencies, Inst Ciencies Espai CSIC IEEC, E-08193 Bellaterra, Spain

[2] European So Observ, Santiago 19, Chile

[3] Joint ALMA Off, Santiago, Chile

[4] Acad Sinica, Inst Astron & Astrophys, Taipei 106, Taiwan

[5] Cardiff Univ, Sch Phys & Astron, Cardiff CF24 3AA, S Glam, Wales

[6] Ctr Astrobiol INTA CSIC, Dpto Astrofis, E-28691 Villanueva De La Canada, Spain

[7] Univ Autonoma Madrid, Fac Ciencias, Dpto Fis Teor, E-28049 Madrid, Spain

[8] CALTECH, Spitzer Sci Ctr, Pasadena, CA 91125 USA

[9] European Space Astron Ctr ESA, Herschel Sci Ctr, E-28691 Madrid, Spain

[10] Univ Kiel, Inst Theoret Phys & Astrophys, D-24098 Kiel, Germany

[11] Ctr Astron Hispano Aleman de Calar Alto CAHA, E-04004 Almeria, Spain

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2012年 / 424卷 / 04期

基金：

美国国家航空航天局;

关键词：

brown dwarfs; stars: formation; stars: individual: SSTB213?J041757; stars: individual: SSTB213?J042118; ISM: clouds; dust; extinction; SPITZER C2D SURVEY; LOW-MASS STARS; BIPOLAR MOLECULAR OUTFLOW; YOUNG STELLAR OBJECTS; ROSAT ALL-SKY; GOULD BELT; EVOLUTIONARY MODELS; MAIN-SEQUENCE; RHO-OPHIUCHI; DENSE CORE;

D O I：

10.1111/j.1365-2966.2012.21390.x

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

In an attempt to study whether the formation of brown dwarfs (BDs) takes place as a scaled-down version of low-mass stars, we conducted Institut de Radioastronomie Millimetrique (IRAM)30m/MAMBO-II observations at 1.2 mm in a sample of 12 proto-BD candidates selected from Spitzer/IRAC data in the B213-L1495 clouds in Taurus. Subsequent observations with the Caltech Submillimetre Observatory at 350?mu m, Very Large Array at 3.6 and 6?cm, and IRAM 30m/EMIR in the 12CO?(10), 13CO?(10) and N2H+?(10) transitions were carried out towards the two most promising Spitzer/IRAC source(s), J042118 and J041757. J042118 is associated with a compact (<10?arcsec or <1400 au) and faint source at 350?mu m, while J041757 is associated with a partially resolved ( similar to 16?arcsec or similar to 2000 au) and stronger source emitting at centimetre wavelengths with a flat spectral index. The corresponding masses of the dust condensations are similar to 1 and 5?MJup for J042118 and J041757, respectively. In addition, about 40?arcsec to the north-east of J041757, we detect a strong and extended submillimetre source, J041757-NE, which is not associated with near-infrared/far-infrared emission down to our detection limits, but is clearly detected in 13CO and N2H+ at similar to 7?km?s-1, and for which we estimated a total mass of similar to 100?MJup, close to the mass required to be gravitationally bound. In summary, our observational strategy has allowed us to find in B213-L1495 two proto-BD candidates and one pre-substellar core candidate, whose properties seem to be consistent with a scaled-down version of low-mass stars.

引用

页码：2778 / 2791

页数：14