| Autor: |
Jessy Jose, Beth A. Biller, Loïc Albert, Sophie Dubber, Katelyn Allers, Gregory J. Herczeg, Michael C. Liu, Samuel Pearson, Bhavana Lalchand, Wen-Ping Chen, Mickaël Bonnefoy, Etienne Artigau, Philippe Delorme, Po-shih Chiang, Zhoujian Zhang, Yumiko Oasa |
| Předmět: |
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| Zdroj: |
Astrophysical Journal; 4/1/2020, Vol. 892 Issue 2, p1-1, 1p |
| Abstrakt: |
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 FROM AUTHOR] |
| Databáze: |
Complementary Index |
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