Multiple protostellar systems

Duchêne, Gaspard; Bouvier, J.; Bontemps, Sylvain; André, Ph.; Motte, F.

doi:10.1051/0004-6361:20041209

Cited by 112 publications

(159 citation statements)

References 51 publications

Supporting

Mentioning

147

Contrasting

Order By: Relevance

“…Many of the 154 M4+ TBOSS sample have been observed by infrared direct imaging from the ground (Duchêne et al 2004;Luhman et al 2009a), high resolution imaging employing spacebased measurements with HST (White & Ghez 2001;Kraus et al 2006;Todorov et al 2014), ground-based speckle imaging (Kohler & Leinert 1998;Konopacky et al 2007), and aperture masking or AO imaging (Kraus & Hillenbrand 2009b;Kraus et al 2011). The results of the PACS observations presented here therefore provide the opportunity to assess the similarity or difference in the frequency or typical flux density level of disks for targets with and without companions.…”

Section: Impact Of Companionsmentioning

confidence: 94%

“…For the multiple systems with angular separations in the range ∼5-11 -FU Tau A+B, GG Tau Ba+Bb, IRAS 04191+1523 A+B, and IRAS 04325+2402 AB+C (Luhman et al 2009b;Duchêne et al 2004) -emission longward of the mid-IR is unresolved. For these systems, the combined system photometry were compiled, and the underlying best-fit spectra displayed on the SEDs was combined from the spectral types of both the primary and secondary components.…”

Section: Construction Of Spectral Energy Distributionsmentioning

confidence: 98%

“…Amongst the 5 spatially extended targets 3 have been imaged for companions -IRAS 04191+1523, IRAS 04248+2612, and IRAS 04325+2402. These three resolved sources are binary systems for the which the angular separations are listed in Table 7 (Duchêne et al 2004). The components for two of these systems are separated by an angle larger than the 70 µm beam size.…”

Section: Spatially Extended Targetsmentioning

confidence: 99%

See 2 more Smart Citations

The Taurus Boundary of Stellar/Substellar (TBOSS) Survey

Bulger

Patience

Ward-Duong

et al. 2014

A&A

View full text Add to dashboard Cite

With the PACS instrument on Herschel, 134 low mass members of the Taurus star-forming region spanning the M4-L0 spectral type range and covering the transition from low mass stars to brown dwarfs were observed. Combining the new Herschel results with other Herschel programs, a total of 150 of the 154 M4-L0 Taurus members have observations, and we have added an additional 3 targets from Spitzer to form the 153-object TBOSS (Taurus Boundary of Stellar/Substellar) sample, a 99% complete study. Among the 150 targets, 70 µm flux densities were measured for 7 of the 7 Class I objects, 48 of the 67 Class II objects, and 3 of the 76 Class III objects. For the detected Class II objects, the median 70 µm flux density level declines with spectral type; however, the distribution of excess relative to central object flux density does not change across the stellar/substellar boundary in the M4-L0 range. Connecting the 70 µm TBOSS values with the results from K0-M3 Class II members results in the first comprehensive census of far-IR emission across the full mass spectrum of the stellar and substellar population of a star-forming region, and the median flux density declines with spectral type in a trend analogous to the flux density decline expected for the central objects. Spectral energy distributions (SEDs) were constructed for all TBOSS targets covering the optical to far-IR range and extending to the submm/mm for a subset of sources with longer wavelength data. Based on an initial exploration of the impact of different physical parameters on the Herschel flux densities, geometrical factors such as inclination and structural parameters such as scale height and flaring have the largest influence on the flux densities in the PACS bands. From the 24 µm to 70 µm spectral index of the SEDs, 5 new candidate transition disks were identified. Considering the previously known and new candidate transition disks, the spectral indices over longer wavelengths (≥70 µm) are not distinct from those of the full Class II population, suggesting that the outer regions of the transition disks are similar to Class II disks. The steep 24 µm to 70 µm slope for a subset of 8 TBOSS targets may be an indication of truncated disks in these systems, however additional measurements are required to establish the outer radii of these disks conclusively. From existing high angular resolution companion search observations, two examples of mixed pair systems that include secondaries with disks were measured in the Herschel data. Finally, comparing the TBOSS results with a Herschel study of Ophiuchus brown dwarfs reveals a lower fraction of disks around the Taurus substellar population with flux densities comparable to the Ophiuchus disks.

show abstract

Section: Impact Of Companionsmentioning

confidence: 94%

Section: Construction Of Spectral Energy Distributionsmentioning

confidence: 98%

Section: Spatially Extended Targetsmentioning

confidence: 99%

See 1 more Smart Citation

The Taurus Boundary of Stellar/Substellar (TBOSS) Survey

Bulger

Patience

Ward-Duong

et al. 2014

A&A

View full text Add to dashboard Cite

show abstract

“…Recently, extremely young protostars (i.e., Class 0 protostars) have been observed with radio interferometers (e.g., Looney et al 2000) and wide-field near-infrared cameras (Duchêne et al 2004). These observations showed that stars already have a high multiplicity at the moment of their birth.…”

Section: Fragmentation and Binary Formationmentioning

confidence: 99%

Recent Developments in Simulations of Low-mass Star Formation

Machida¹

2010

Proc. IAU

View full text Add to dashboard Cite

Abstract. In star forming regions, we can observe different evolutionary stages of various objects and phenomena such as molecular clouds, protostellar jets and outflows, circumstellar disks, and protostars. However, it is difficult to directly observe the star formation process itself, because it is veiled by the dense infalling envelope. Numerical simulations can unveil the star formation process in the collapsing gas cloud. Recently, some studies showed protostar formation from the prestellar core stage, in which both molecular clouds and protostars are resolved with sufficient spatial resolution. These simulations showed fragmentation and binary formation, outflow and jet driving, and circumstellar disk formation in the collapsing gas clouds. In addition, the angular momentum transfer and dissipation process of the magnetic field in the star formation process were investigated. In this paper, I review recent developments in numerical simulations of lowmass star formation.

show abstract

“…It is certainly the best target presently accessible from the ground to measure, for the first time, internal stellar motions in an embedded IR cluster. In addition, we can use various surveys that have studied this cluster (Bontemps et al 1998;Duchêne et al 2004;Stamatellos et al 2007), which have achieved a census of the population of young stars with IR excesses. This allowed these authors to discuss, for the first time, the mass function in such a young cluster down to masses of less than 0.1 M .…”

mentioning

confidence: 99%

The dynamics of an extremely young cluster probed for the first time

et al. 2009

View full text Add to dashboard Cite

Abstract. We present a proper-motion program that we have developed at ESO to measure, for the first time, proper motions of members of the nearby (125 pc), very young (4 × 10 5 yr) infrared ρ Ophiuchi cluster. Repeated imaging over an extended period will allow us to measure the global proper motion of the cluster and its velocity dispersion and will provide access to the ∼ 1 km s −1 velocities for objects as faint as K = 15.7 mag. Access to the velocity field of such an extremely young cluster is of crucial importance to investigate the origin and early evolution of open cluster systems.

show abstract

Multiple protostellar systems

Cited by 112 publications

References 51 publications

The Taurus Boundary of Stellar/Substellar (TBOSS) Survey

The Taurus Boundary of Stellar/Substellar (TBOSS) Survey

Recent Developments in Simulations of Low-mass Star Formation

The dynamics of an extremely young cluster probed for the first time

Contact Info

Product

Resources

About