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 - Observatoire des Sciences de la Terre, de l'Univers et de l'Environnement de Grenoble Accéder directement au contenu
Article Dans Une Revue The Astrophysical Journal Année : 2020

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

Michael Liu
Zhoujian Zhang
Yumiko Oasa
  • Fonction : Auteur

Résumé

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.
Fichier principal
Vignette du fichier
2002.02473v2.pdf (9.3 Mo) Télécharger le fichier
Origine Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-03049263 , version 1 (22-07-2024)

Identifiants

Citer

Jessy Jose, Beth Biller, Loïc Albert, Sophie Dubber, Katelyn Allers, et al.. 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. The Astrophysical Journal, 2020, 892 (2), pp.122. ⟨10.3847/1538-4357/ab74dd⟩. ⟨hal-03049263⟩
16 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Mastodon Facebook X LinkedIn More