2020ApJ...892..122J -
Astrophys. J., 892, 122-122 (2020/April-1)
A novel survey for young substellar objects with the W-band filter. II. The coolest and lowest mass members of the Serpens-South star-forming region.
JOSE J., BILLER B.A., ALBERT L., DUBBER S., ALLERS K., HERCZEG G.J., LIU M.C., PEARSON S., LALCHAND B., CHEN W.-P., BONNEFOY M., ARTIGAU E., DELORME P., CHIANG P.-S., ZHANG Z. and OASA Y.
Abstract (from CDS):
Given its relative proximity (∼430 pc), compact size (<20'), young age (∼0.5 Myr), and rich number of young stellar objects, the Serpens-South star-forming region is a promising site for studying young substellar objects, yet the low-mass members of this region remain largely undiscovered. In this article we report on a deep photometric survey using a custom 1.45 µm filter (W band), as well as standard J and H near-IR filters, in order to identify candidate low-mass young brown dwarfs in the Serpens-South region. We constructed a reddening-insensitive index (Q) by combining J, H and W-band photometry for survey objects, in order to identify candidate low-mass members of Serpens based on the strength of the water-absorption feature at 1.45 µm in the atmospheres of mid-M and later objects. We then conducted spectroscopic follow-up to confirm youth and spectral type for our candidates. This is the first survey to identify the very low-mass and coolest members of Serpens-South. We identify four low-mass candidate Serpens members, which all display IR excess emission, indicating the likely presence of circumstellar disks around them. One of the four candidate low-mass members in our list, SERP182918-020245, exhibits Paβ and Brγ emission features, confirming its youth and ongoing magnetospheric accretion. Our new candidate members have spectral types >M4 and are the coolest and lowest mass candidate members yet identified in Serpens-South.
Abstract Copyright:
© 2020. The American Astronomical Society. All rights reserved.
Journal keyword(s):
Brown dwarfs - Low mass stars - M subdwarf stars - Pre-main sequence stars - Young stellar objects - Infrared excess
Status at CDS
:
Examining the need for a new acronym.
Simbad objects:
14
Full paper
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