PPMXLBMD - PPM-XL Bright M Dwarfs Catalog

Overview

Using the Position and Proper Motion Extended-L (PPMXL) catalog, the authors have used optical and near-infrared color cuts together with a reduced proper motion cut to find bright M dwarfs for future exoplanet transit studies. PPMXL's low proper-motion uncertainties allow them to probe down to smaller proper motions than previous similar studies. The authors have combined unique objects found with this method to that of previous work to produce 8,479 K < 9th magnitude M dwarfs. Low-resolution spectroscopy was obtained of a sample of the objects found using this selection method to gain statistics on their spectral type and physical properties. Results show a spectral-type range of K7 to M4V. This catalog is the most complete collection of K < 9 M dwarfs currently available and is made available herein.

The PPMXL catalog (Roeser et al. 2010) represents a combination of the USNO-B1.0 and Two Micron All-Sky Survey (2MASS) catalogs mapped on to the International Celestial Reference Frame (ICRF), which allows proper motions to be described in a quasi-absolute manner as opposed to relative. PPMXL now provides low uncertainties for both the proper motion and position for many of the objects within the two catalogs. Typical uncertainties for proper motions are 4 - 10 mas/yr. The NIR JHK magnitudes from 2MASS and the optical BVRI magnitudes from USNO-B1.0 also provide very useful color information about the objects and are used during the sample selection process.

In this work, the authors classified 4,054 M dwarfs with magnitudes of K < 9 from the PPMXL catalog. By probing down to lower proper motions, this work has produced 1,193 new bright M dwarf candidates that were not included in previous catalogs. By combining these objects with M dwarfs from Lepine & Gaidos (2011, AJ, 142, 138) the authors obtained a final catalog with 8,479 K < 9 late K and M dwarfs suitable for future exoplanet transit studies.

Catalog Bibcode

2013MNRAS.435.2161F

References

A catalogue of bright (K < 9) M dwarfs.
    Frith J., Pinfield D.J., Jones H.R.A., Barnes J.R., Pavlenko Y.,
    Martin E.L., Brown C., Kuznetsov M.K., Marocco F., Tata R., Cappetta M.
   <Mon. Not. R. Astron. Soc., 435, 2161-2170 (2013)>
   =2013MNRAS.435.2161F
The PPMXL catalog of positions and proper motions on the ICRS. Combining
USNO-B1.0 and the two Micron All Sky Survey (2MASS).
     Roeeser S., Demleitner M., Schilbach E.
    <Astron. J. 139, 2440 (2010)>
    =2010AJ....139.2440R
PPM-Extended (PPMX), a catalogue of positions and proper motions
     Roeser S., Schilbach E., Schwan H., Kharchenko N.V.,  Piskunov A.E.,
     Scholz R.-D.
    <Astron. Astrophys. 488, 401 (2008)>
    =2008A&A...488..401R

Provenance

This table was created by the HEASARC in February 2015 based on the CDS Catalog J/MNRAS/435/2161 file table3.dat.

Parameters

Source_Number
A unique sequential identification number for each source in the catalog in order of increasing J2000.0 Right Ascension.

Name
The source designation for the M dwarf created by the HEASARC in the style recommended by the CDS Dictionary of Nomenclature of Celestial Objects, e.g. '[FPJ2013] nnnn', where the prefix stands for Frith, Pinfield, Jones 2013 and 'nnnn' is the source number value.

RA
The Right Ascension of the M dwarf in the selected equinox. Notice that the equinox (and epoch) of the RA in the PPMXL catalog were J2000, and that the HEASARC RA parameter is precessed, if necessary, from the J2000 value, with no allowance being made for proper motion.

Dec
The Declination of the M dwarf in the selected equinox. Notice that the equinox (and epoch) of the Declination in the PPMXL catalog were J2000, and that the HEASARC RA parameter is precessed, if necessary, from the J2000 value, with no allowance being made for proper motion.

LII
The Galactic Longitude of the M dwarf.

BII
The Galactic Latitude of the M dwarf.

PM_RA
The proper motion of the M dwarf along the Right Ascension direction, in mas/year.

PM_RA_Error
The uncertainty in the proper motion of the M dwarf along the Right Ascension direction, in mas/year.

PM_Dec
The proper motion of the M dwarf along the Declination direction, in mas/year.

PM_Dec_Error
The uncertainty in the proper motion of the M dwarf along the Declination direction, in mas/year.

Jmag
The 2MASS J magnitude of the M dwarf.

Hmag
The 2MASS H magnitude of the M dwarf.

Ks_Mag
The 2MASS K_s magnitude of the M dwarf.

B1_Mag
The USNO-B1 B magnitude of the M dwarf from the first epoch. These magnitudes should be used with care, as the photometric calibration may be severely off for some plates.

B2_Mag
The USNO-B1 B magnitude of the M dwarf from the second epoch. These magnitudes should be used with care, as the photometric calibration may be severely off for some plates.

R1_Mag
The USNO-B1 R magnitude of the M dwarf from the first epoch. These magnitudes should be used with care, as the photometric calibration may be severely off for some plates.

R2_Mag
The USNO-B1 R magnitude of the M dwarf from the second epoch. These magnitudes should be used with care, as the photometric calibration may be severely off for some plates.

Imag
The USNO-B1 I magnitude of the M dwarf. These magnitudes should be used with care, as the photometric calibration may be severely off for some plates. The USNO-B1 I magnitude of the M dwarf.

PPMXL_Flag
This parameter contains the PPMXL flag value, with values and meanings as follows:

      1 = one of the coordinates had an excessively large chi²
      2 = row from PPMX (CDS Cat. I/312) [if set, magnitudes b1, b2, r1, r2, i
          have a special meaning]
     10 = row from PPMX (CDS Cat. I/312) [if set, magnitudes b1, b2, r1, r2, i
          have a special meaning] and replaces multiple USNO-B1.0 objects

PM_Tot
The total proper motion of the M dwarf, in mas/year.

JK_Color
The 2MASS J-K color index of the M dwarf.

Ref_PM
The reference codes and meanings for the origin of the proper motion information:

     1 = PPMXL (CDS Cat. I/317)
     2 = SUPERBLINK
     3 = Tycho-2 (CDS Cat. I/259)

Contact Person

Questions regarding the PPMXLBMD database table can be addressed to the HEASARC Help Desk.

Page Author: Browse Software Development Team
Last Modified: Monday, 16-Sep-2024 17:33:09 EDT