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
| Autor: | Loic Albert, Mickael Bonnefoy, Jessy Jose, Gregory J. Herczeg, Beth Biller, Poshih Chiang, Michael C. Liu, Philippe Delorme, Zhoujian Zhang, Katelyn N. Allers, Étienne Artigau, Samuel Pearson, Wen Ping Chen, Bhavana Lalchand, Sophie Dubber, Yumiko Oasa |
|---|---|
| Přispěvatelé: | Indian Institute of Science Education and Research, Institut de Planétologie et d'Astrophysique de Grenoble (IPAG), Centre National d'Études Spatiales [Toulouse] (CNES)-Observatoire des Sciences de l'Univers de Grenoble (OSUG ), Institut national des sciences de l'Univers (INSU - CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Grenoble Alpes (UGA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Grenoble Alpes (UGA) |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Physics
Earth and Planetary Astrophysics (astro-ph.EP) [PHYS]Physics [physics] 010504 meteorology & atmospheric sciences Serpens [SDU.ASTR.EP]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP] FOS: Physical sciences Astronomy and Astrophysics Astrophysics Star (graph theory) 01 natural sciences Astrophysics - Astrophysics of Galaxies W band Astrophysics - Solar and Stellar Astrophysics Space and Planetary Science Filter (video) Astrophysics of Galaxies (astro-ph.GA) 0103 physical sciences 010303 astronomy & astrophysics Solar and Stellar Astrophysics (astro-ph.SR) ComputingMilieux_MISCELLANEOUS 0105 earth and related environmental sciences Astrophysics - Earth and Planetary Astrophysics |
| Zdroj: | The Astrophysical Journal The Astrophysical Journal, American Astronomical Society, 2020, 892 (2), pp.122. ⟨10.3847/1538-4357/ab74dd⟩ |
| ISSN: | 0004-637X 1538-4357 |
| DOI: | 10.3847/1538-4357/ab74dd⟩ |
| Popis: | 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 sub-stellar objects, yet the low-mass members of this region remain largely undiscovered. In this paper we report on a deep photometric survey using a custom 1.45 um 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 um 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 4 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 Pa_beta and Br_gamma 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. Published in ApJ, 23 pages, 12 figures |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|