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Title: Time-resolved WISE/NEOWISE Coadds

Abstract

We have used the first ~3 years of 3.4 μm (W1) and 4.6 μm (W2) observations from the WISE and NEOWISE missions to create a full-sky set of time-resolved coadds. As a result of the WISE survey strategy, a typical sky location is visited every six months and is observed during ≳ 12 exposures per visit, with these exposures spanning a ~1 day time interval. We have stacked the exposures within such ~1 day intervals to produce one coadd per band per visit - that is, one coadd every six months at a given position on the sky in each of W1 and W2. For most parts of the sky, we have generated six epochal coadds per band, with one visit during the fully cryogenic WISE mission, one visit during NEOWISE, and then, after a 33-month gap, four more visits during the NEOWISE-Reactivation mission phase. These coadds are suitable for studying long-timescale mid-infrared variability and measuring motions to ~1.3 mag fainter than the single-exposure detection limit. In most sky regions, our coadds span a 5.5-year time period and therefore provide a >10× enhancement in time baseline relative to that available for the AllWISE catalog's apparent motion measurements. As such, themore » signature application of these new coadds is expected to be motion-based identification of relatively faint brown dwarfs, especially those cold enough to remain undetected by Gaia.« less

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Berkeley Center for Cosmological Physics, Berkeley, CA (United States)
  2. Univ. of Toronto, ON (Canada); Univ. of Waterloo, ON (Canada)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1477351
DOE Contract Number:  
AC02-05CH11231
Resource Type:
Journal Article
Journal Name:
Astronomical Journal (Online)
Additional Journal Information:
Journal Volume: 156; Journal Issue: 2; Journal ID: ISSN 1538-3881
Publisher:
IOP Publishing - AAAS
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS

Citation Formats

Meisner, A. M., Lang, D., and Schlegel, D. J. Time-resolved WISE/NEOWISE Coadds. United States: N. p., 2018. Web. doi:10.3847/1538-3881/aacbcd.
Meisner, A. M., Lang, D., & Schlegel, D. J. Time-resolved WISE/NEOWISE Coadds. United States. doi:10.3847/1538-3881/aacbcd.
Meisner, A. M., Lang, D., and Schlegel, D. J. Thu . "Time-resolved WISE/NEOWISE Coadds". United States. doi:10.3847/1538-3881/aacbcd. https://www.osti.gov/servlets/purl/1477351.
@article{osti_1477351,
title = {Time-resolved WISE/NEOWISE Coadds},
author = {Meisner, A. M. and Lang, D. and Schlegel, D. J.},
abstractNote = {We have used the first ~3 years of 3.4 μm (W1) and 4.6 μm (W2) observations from the WISE and NEOWISE missions to create a full-sky set of time-resolved coadds. As a result of the WISE survey strategy, a typical sky location is visited every six months and is observed during ≳ 12 exposures per visit, with these exposures spanning a ~1 day time interval. We have stacked the exposures within such ~1 day intervals to produce one coadd per band per visit - that is, one coadd every six months at a given position on the sky in each of W1 and W2. For most parts of the sky, we have generated six epochal coadds per band, with one visit during the fully cryogenic WISE mission, one visit during NEOWISE, and then, after a 33-month gap, four more visits during the NEOWISE-Reactivation mission phase. These coadds are suitable for studying long-timescale mid-infrared variability and measuring motions to ~1.3 mag fainter than the single-exposure detection limit. In most sky regions, our coadds span a 5.5-year time period and therefore provide a >10× enhancement in time baseline relative to that available for the AllWISE catalog's apparent motion measurements. As such, the signature application of these new coadds is expected to be motion-based identification of relatively faint brown dwarfs, especially those cold enough to remain undetected by Gaia.},
doi = {10.3847/1538-3881/aacbcd},
journal = {Astronomical Journal (Online)},
issn = {1538-3881},
number = 2,
volume = 156,
place = {United States},
year = {2018},
month = {7}
}

Journal Article:

Figures / Tables:

Figure 1 Figure 1: Number of W1 coadd epochs per coadd id astrometric footprint, shown in ecliptic coordinates. Yellow boxes denote footprints for which the number of W1 coadd epochs differs from the number of W2 coadd epochs. Typically there are six coadd epochs available per band (black dots). The red-colored rangesmore » of ecliptic longitude have only five coadd epochs per band because they were impacted by the command timing anomaly in 2014 April. The green-colored ranges of ecliptic longitude have an extra seventh epoch because they were observed during the partially complete third sky pass of the pre-hibernation mission. The ecliptic poles (|β| > 80◦) are blue, indicating >7 available coadd epochs in each band as a result of the modified time-slicing rules employed for these regions (see §3.2.2).« less

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