English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We present observations of three Class 0/I protostars (L1157-mm, CB230 IRS1,and L1165-SMM1) using the Karl G. Jansky Very Large Array (VLA) andobservations of two (L1165-SMM1 and CB230 IRS1) with the Combined Array forResearch in Millimeter-wave Astronomy (CARMA). The VLA observations were takenat wavelengths of $\lambda = 7.3$ mm, 1.4 cm, 3.3 cm, 4.0 cm, and 6.5 cm with abest resolution of $\sim$0\farcs06 (18 AU) at 7.3 mm. The L1165-SMM1 CARMAobservations were taken at $\lambda = 1.3$ mm with a best resolution of$\sim0\farcs3$ (100 AU), and the CB230 IRS1 observations were taken at $\lambda= 3.4$ mm with a best resolution of $\sim$3\arcsec\ (900 AU). We find thatL1165-SMM1 and CB230 IRS1 have probable binary companions at separations of$\sim$0\farcs3 (100 AU) from detections of secondary peaks at multiplewavelengths. The position angles of these companions are nearly orthogonal tothe direction of the observed bipolar outflows, consistent with the expectedprotostellar disk orientations. We suggest that these companions may haveformed from disk fragmentation; turbulent fragmentation would notpreferentially arrange the binary companions to be orthogonal to the outflowdirection. For L1165-SMM1, both the 7.3 mm and 1.3 mm emission show evidence ofa large (R $>$ 100 AU) disk. For the L1165-SMM1 primary protostar and the CB230IRS1 secondary protostar, the 7.3 mm emission is resolved into structuresconsistent with $\sim20$ AU radius disks. For the other protostars, includingL1157-mm, the emission is unresolved, suggesting disks with radii $< 20$ AU.

VLA and CARMA Observations of Protostars in the Cepheus Clouds: Sub-arcsecond Proto-Binaries Formed via Disk Fragmentation