J/A+A/680/A73 CARMENES M dwarf template library (Nagel+ 2023)
The CARMENES search for exoplanets around M dwarfs.
Telluric absorption corrected high S/N optical and near-infrared template
spectra of 382 M dwarf stars.
Nagel E., Czesla S., Kaminski A., Zechmeister M., Tal-Or L.,
Schmitt J.H.M.M., Reiners A., Quirrenbach A., Garcia Lopez A.,
Caballero J.A., Ribas I., Amado P.J., Bejar V.J.S., Cortes-Contreras M.,
Dreizler S., Hatzes A.P., Henning T., Jeffers S.V., Kuerster M.,
Lafarga M., Lopez-Puertas M., Montes D., Morales J.C., Pedraz S.,
Schweitzer A.
<Astron. Astrophys. 680, A73 (2023)>
=2023A&A...680A..73N 2023A&A...680A..73N (SIMBAD/NED BibCode)
ADC_Keywords: Stars, M-type ; Spectroscopy ; Spectra, infrared
Keywords: atmospheric effects - instrumentation: spectrographs -
methods: data analysis methods: observational - stars: low-mass -
techniques: spectroscopic
Abstract:
Light from celestial objects interacts with the molecules of the
Earth's atmosphere, resulting in the production of telluric absorption
lines in ground-based spectral data. Correcting for these lines, which
strongly affect red and infrared wavelengths, is often needed in a
wide variety of scientific applications. Here we present the template
division telluric modeling (TDTM) technique, a method to accurately
remove telluric absorption lines in stars that exhibit numerous
intrinsic features. Based on the Earth's barycentric motion through
the year, our approach is suited to disentangle telluric and stellar
spectral components. By fitting a synthetic transmission model,
telluric-free spectra are derived. We demonstrate the performance of
the TDTM technique in correcting telluric contamination using a
high-resolution optical spectral time series of the feature-rich M3.0
dwarf star Wolf 294 obtained with the CARMENES spectrograph. We apply
the TDTM approach to the CARMENES survey sample, which consists of 382
targets encompassing 22357 optical and 20314 near-infrared spectra, to
correct for telluric absorption. The corrected spectra are co-added to
construct template spectra for each of our targets. This library of
telluric-free, high signal-to-noise ratio (S/N), high-resolution
(R>80000) templates comprises the most comprehensive collection of
spectral M dwarf data available to date, both in terms of quantity and
quality, and is available at the project's website.
Description:
In Table C.1, we provide the list of stars included in the spectral
template library, which features telluric-free, high S/N optical (VIS)
and near-infrared (NIR) CARMENES spectra. The individual observations
of each star have been corrected for telluric absorption lines using
the TDTM technique. Subsequently, the individual spectra have been
coadded to produce a high S/N template spectrum for each star. Details
in Table C.1 include the the star identifier, coordinates, spectral
type, J magnitude, the number of coadded spectra for each VIS and NIR
template, and the S/N of each VIS and NIR template. The template
spectra are accessible through the CARMENES GTO Data Archive
(http://carmenes.cab.inta-csic.es).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablec1.dat 99 382 CARMENES template library properties
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See also:
http://carmenes.cab.inta-csic.es : CARMENES GTO Data Archive
Byte-by-byte Description of file: tablec1.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq Sequential number
5- 15 A11 --- ID ID (JHHMMm+DDmA)
17- 39 A23 --- Name Name
41- 46 A6 --- GJ GJ name
48- 49 I2 h RAh Right Ascension (J2000)
51- 52 I2 min RAm Right Ascension (J2000)
54- 58 F5.2 s RAs Right Ascension (J2000)
60 A1 --- DE- Declination sign (J2000)
61- 62 I2 deg DEd Declination (J2000)
64- 65 I2 arcmin DEm Declination (J2000)
67- 70 F4.1 arcsec DEs Declination (J2000)
72- 75 A4 --- SpType MK spectral type
77- 81 F5.2 mag Jmag J magnitude
83- 85 I3 --- VISobs Number coadded spectra (VIS)
87- 90 I4 --- VISsnr Signal-to-noise ratio of coadded VIS spectrum
92- 94 I3 --- NIRobs Number coadded spectra (NIR)
96- 99 I4 --- NIRsnr Signal-to-noise ratio of coadded NIR spectrum
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Acknowledgements:
Evangelos Nagel, Evangelos.Nagel(at)uni-goettingen.de
(End) Evangelos Nagel [Univ. Goettingen], Patricia Vannier [CDS] 07-Oct-2023