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 the results of ALMA band 7 observations of dust and CO gas in thedisks around 7 objects with spectral types ranging between M5.5 and M7.5 inUpper Scorpius OB1, and one M3 star in Ophiuchus. We detect unresolvedcontinuum emission in all but one source, and the $^{12}$CO J=3-2 line in twosources. We constrain the dust and gas content of these systems using a grid ofmodels calculated with the radiative transfer code MCFOST, and find disk dustmasses between 0.1 and 1 M$_\oplus$, suggesting that the stellar mass / diskmass correlation can be extrapolated for brown dwarfs with masses as low as0.05 M$_\odot$. The one disk in Upper Sco in which we detect CO emission, 2MASSJ15555600, is also the disk with warmest inner disk as traced by its H - [4.5]photometric color. Using our radiative transfer grid, we extend the correlationbetween stellar luminosity and mass-averaged disk dust temperature originallyderived for stellar mass objects to the brown dwarf regime to $\langle T_{dust}\rangle \approx 22 (L_{*} /L_{\odot})^{0.16} K$, applicable to spectral typesof M5 and later. This is slightly shallower than the relation for earlierspectral type objects and yields warmer low-mass disks. The two prescriptionscross at 0.27 L$_\odot$, corresponding to masses between 0.1 and 0.2 M$_\odot$depending on age.

Dust masses of disks around 8 Brown Dwarfs and Very Low-Mass Stars in Upper Sco OB1 and Ophiuchus