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26 April 2024 |
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Article overview
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Search for associations containing young stars (SACY) VII. New stellar and substellar candidate members in the young associations | | P. Elliott
; A. Bayo
; C. H. F. Melo
; C. A. O. Torres
; M. F. Sterzik
; G. R. Quast
; D. Montes
; R. Brahm
; | | Date: |
12 Apr 2016 | | Abstract: | The young associations offer us one of the best opportunities to study the
properties of young stellar and substellar objects and to directly image
planets thanks to their proximity ($<$200 pc) and age ($approx$5-150 Myr).
However, many previous works have been limited to identifying the brighter,
more active members ($approx$1 M$_odot$) owing to photometric survey
sensitivities limiting the detections of lower mass objects. We search the
field of view of 542 previously identified members of the young associations to
identify wide or extremely wide (1000-100,000 au in physical separation)
companions. We combined 2MASS near-infrared photometry ($J$, $H$, $K$) with
proper motion values (from UCAC4, PPMXL, NOMAD) to identify companions in the
field of view of known members. We collated further photometry and spectroscopy
from the literature and conducted our own high-resolution spectroscopic
observations for a subsample of candidate members. This complementary
information allowed us to assess the efficiency of our method. We identified 84
targets (45: 0.2-1.3 M$_odot$, 17: 0.08-0.2 M$_odot$, 22: $<$0.08 M$_odot$)
in our analysis, ten of which have been identified from spectroscopic analysis
in previous young association works. For 33 of these 84, we were able to
further assess their membership using a variety of properties (X-ray emission,
UV excess, H$_alpha$, lithium and K I equivalent widths, radial velocities,
and CaH indices). We derive a success rate of 76-88% for this technique based
on the consistency of these properties. Once confirmed, the targets identified
in this work would significantly improve our knowledge of the lower mass end of
the young associations. Additionally, these targets would make an ideal new
sample for the identification and study of planets around nearby young stars. | | Source: | arXiv, 1604.3550 | | Services: | Forum | Review | PDF | Favorites | |
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