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Title: Time-resolved High Spectral Resolution Observation of 2MASSW J0746425+200032AB

Abstract

Many brown dwarfs (BDs) exhibit photometric variability at levels from tenths to tens of percents. The photometric variability is related to magnetic activity or patchy cloud coverage, characteristic of BDs near the L–T transition. Time-resolved spectral monitoring of BDs provides diagnostics of cloud distribution and condensate properties. However, current time-resolved spectral studies of BDs are limited to low spectral resolution ( R ∼ 100) with the exception of the study of Luhman 16 AB at a resolution of 100,000 using the VLT+CRIRES. This work yielded the first map of BD surface inhomogeneity, highlighting the importance and unique contribution of high spectral resolution observations. Here, we report on the time-resolved high spectral resolution observations of a nearby BD binary, 2MASSW J0746425+200032AB. We find no coherent spectral variability that is modulated with rotation. Based on simulations, we conclude that the coverage of a single spot on 2MASSW J0746425+200032AB is smaller than 1% or 6.25% if spot contrast is 50% or 80% of its surrounding flux, respectively. Future high spectral resolution observations aided by adaptive optics systems can put tighter constraints on the spectral variability of 2MASSW J0746425+200032AB and other nearby BDs.

Authors:
;  [1];  [2]
  1. Department of Astronomy, California Institute of Technology, MC 249-17, 1200 E. California Boulevard, Pasadena, CA 91106 (United States)
  2. Lowell Observatory, 1400 West Mars Hill Road, Flagstaff, AZ 86001 (United States)
Publication Date:
OSTI Identifier:
22661252
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 838; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ATMOSPHERES; CLOUDS; CONDENSATES; DISTRIBUTION; DWARF STARS; EXCEPTIONS; LIMITING VALUES; OPTICS; ROTATION; SIMULATION; STARS; SURFACES; TIME RESOLUTION

Citation Formats

Wang, Ji, Mawet, Dimitri, and Prato, Lisa, E-mail: ji.wang@caltech.edu. Time-resolved High Spectral Resolution Observation of 2MASSW J0746425+200032AB. United States: N. p., 2017. Web. doi:10.3847/1538-4357/AA6345.
Wang, Ji, Mawet, Dimitri, & Prato, Lisa, E-mail: ji.wang@caltech.edu. Time-resolved High Spectral Resolution Observation of 2MASSW J0746425+200032AB. United States. doi:10.3847/1538-4357/AA6345.
Wang, Ji, Mawet, Dimitri, and Prato, Lisa, E-mail: ji.wang@caltech.edu. Mon . "Time-resolved High Spectral Resolution Observation of 2MASSW J0746425+200032AB". United States. doi:10.3847/1538-4357/AA6345.
@article{osti_22661252,
title = {Time-resolved High Spectral Resolution Observation of 2MASSW J0746425+200032AB},
author = {Wang, Ji and Mawet, Dimitri and Prato, Lisa, E-mail: ji.wang@caltech.edu},
abstractNote = {Many brown dwarfs (BDs) exhibit photometric variability at levels from tenths to tens of percents. The photometric variability is related to magnetic activity or patchy cloud coverage, characteristic of BDs near the L–T transition. Time-resolved spectral monitoring of BDs provides diagnostics of cloud distribution and condensate properties. However, current time-resolved spectral studies of BDs are limited to low spectral resolution ( R ∼ 100) with the exception of the study of Luhman 16 AB at a resolution of 100,000 using the VLT+CRIRES. This work yielded the first map of BD surface inhomogeneity, highlighting the importance and unique contribution of high spectral resolution observations. Here, we report on the time-resolved high spectral resolution observations of a nearby BD binary, 2MASSW J0746425+200032AB. We find no coherent spectral variability that is modulated with rotation. Based on simulations, we conclude that the coverage of a single spot on 2MASSW J0746425+200032AB is smaller than 1% or 6.25% if spot contrast is 50% or 80% of its surrounding flux, respectively. Future high spectral resolution observations aided by adaptive optics systems can put tighter constraints on the spectral variability of 2MASSW J0746425+200032AB and other nearby BDs.},
doi = {10.3847/1538-4357/AA6345},
journal = {Astrophysical Journal},
number = 1,
volume = 838,
place = {United States},
year = {Mon Mar 20 00:00:00 EDT 2017},
month = {Mon Mar 20 00:00:00 EDT 2017}
}