SIMBAD references

2016ApJ...827..142B - Astrophys. J., 827, 142-142 (2016/August-3)

ALMA observations of circumstellar disks in the Upper Scorpius OB association.


Abstract (from CDS):

We present ALMA observations of 106 G-, K-, and M-type stars in the Upper Scorpius OB Association hosting circumstellar disks. With these data, we measure the 0.88mm continuum and 12CO J=3-2 line fluxes of disks around low-mass (0.14-1.66 M) stars at an age of 5-11 Myr. Of the 75 primordial disks in the sample, 53 are detected in the dust continuum and 26 in CO. Of the 31 disks classified as debris/evolved transitional disks, five are detected in the continuum and none in CO. The lack of CO emission in approximately half of the disks with detected continuum emission can be explained if CO is optically thick but has a compact emitting area (<=40 au), or if the CO is heavily depleted by a factor of at least ∼1000 relative to interstellar medium abundances and is optically thin. The continuum measurements are used to estimate the dust mass of the disks. We find a correlation between disk dust mass and stellar host mass consistent with a power-law relation of Mdust\proptoM*1.67±0.37. Disk dust masses in Upper Sco are compared to those measured in the younger Taurus star-forming region to constrain the evolution of disk dust mass. We find that the difference in the mean of logMdust/M*) between Taurus and Upper Sco is 0.64±0.09, such that Mdust/M* is lower in Upper Sco by a factor of ∼4.5.

Abstract Copyright: © 2016. The American Astronomical Society. All rights reserved.

Journal keyword(s): open clusters and associations: individual: Upper Scorpius OB1 - protoplanetary disks - stars: pre-main sequence - stars: pre-main sequence

VizieR on-line data: <Available at CDS (J/ApJ/827/142): table1.dat table4.dat table5.dat>

CDS comments: Table 2: The calibrator J1924-0939 is not in SIMBAD.

Simbad objects: 121

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