J/ApJ/784/156 Parallaxes for 1507 nearby mid-to-late M dwarfs (Dittmann+, 2014)
Trigonometric parallaxes for 1507 nearby mid-to-late M dwarfs.
Dittmann J.A., Irwin J.M., Charbonneau D., Berta-Thompson Z.K.
<Astrophys. J., 784, 156 (2014)>
=2014ApJ...784..156D 2014ApJ...784..156D (SIMBAD/NED BibCode)
ADC_Keywords: Stars, nearby ; Stars, dwarfs ; Stars, M-type ; Stars, masses ;
Parallaxes, trigonometric ; Stars, diameters ;
Cross identifications
Keywords: astrometry - stars: fundamental parameters
Abstract:
The MEarth survey is a search for small rocky planets around the
smallest, nearest stars to the Sun as identified by high proper motion
with red colors. We augmented our planetary search time series with
lower cadence astrometric imaging and obtained two million images of
approximately 1800 stars suspected to be mid-to-late M dwarfs. We fit
an astrometric model to MEarth's images for 1507 stars and obtained
trigonometric distance measurements to each star with an average
precision of 5mas. Our measurements, combined with the Two Micron All
Sky Survey photometry, allowed us to obtain an absolute Ks magnitude
for each star. In turn, this allows us to better estimate the stellar
parameters than those obtained with photometric estimates alone and to
better prioritize the targets chosen to monitor at high cadence for
planetary transits. The MEarth sample is mostly complete out to a
distance of 25pc for stars of type M5.5V and earlier, and mostly
complete for later type stars out to 20pc. We find eight stars that
are within 10pc of the Sun for which there did not exist a published
trigonometric parallax distance estimate. We release with this work a
catalog of the trigonometric parallax measurements for 1507
mid-to-late M dwarfs, as well as new estimates of their masses and
radii.
Description:
The MEarth Observatory is an array consisting of eight identical f/9
40cm Ritchey-Chretien telescopes on German equatorial mounts at the
Fred Lawrence Whipple Observatory on Mount Hopkins, Arizona. The
telescopes are controlled robotically and collect data every clear
night from September through July. The facility is closed every August
for the summer monsoons. Each telescope contains a 2048*2048 pixel CCD
with a pixel scale of ∼0.76/pixel and a Schott RG715 glass filter with
anti-reflection coating. The cutoff is defined by the CCD response,
and the effective bandpass is similar to the union of the Sloan
Digital Sky Survey i and z filters.
The MEarth target list consists of ∼1800 nearby M dwarfs selected from
Lepine 2005 (cat. J/AJ/130/1680), a subset of the LSPM-North catalog
(Lepine & Shara 2005, cat. I/298) believed to be within 33pc of the
Sun. The subset of the MEarth sample presented here includes 1507
mid-to-late M dwarfs (see Table2) for which we can obtain reliable
results. Of the 1507 stars, 1267 had no previous trigonometric
parallax measurement.
The data presented here covers the time period from 2008 September
through 2013 July.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table2.dat 168 1507 Catalog
--------------------------------------------------------------------------------
See also:
I/311 : Hipparcos, the New Reduction (van Leeuwen, 2007)
I/298 : LSPM-North proper-motion catalog nearby stars (Lepine+, 2005)
I/279 : Revised Luyten Half-Second Catalogue (Bakos+ 2002)
I/239 : The Hipparcos and Tycho Catalogues (ESA 1997)
I/238 : Yale Trigonometric Parallaxes, Fourth Edition (van Altena+ 1995)
V/70 : Nearby Stars, Preliminary 3rd Version (Gliese+ 1991)
I/98 : NLTT Catalogue (Luyten, 1979)
I/87 : LHS Catalogue, 2nd Edition (Luyten 1979)
J/ApJ/758/56 : Young M dwarfs within 25pc. II. Kinematics (Shkolnik+, 2012)
J/ApJ/757/112 : Stellar diameters. II. K and M-stars (Boyajian+, 2012)
J/ApJ/754/44 : The AstraLux Large M-dwarf Survey (Janson+ 2012)
J/AJ/142/138 : All-sky catalog of bright M dwarfs (Lepine+, 2011)
J/AJ/130/1680 : LSPM-North proper-motion catalog nearby stars (Lepine+, 2005)
J/ApJ/582/1011 : Revised NLTT Catalog (Salim+, 2003)
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 A11 --- LSPM LSPM North Catalog designation (Lepine &
Shara 2005, cat. I/298) (JHHMM+DDMMW)
13- 20 A8 --- Gl Identifier in Gliese catalog (Gliese et al.
1991, cat. V/70)
22- 23 A2 --- m_Gl Component on Gl (A, AB, AC, B, or C)
25- 29 A5 --- LHS Identifier in LHS catalog (1)
31- 35 I5 --- NLTT [309/58828]? NLTT catalog number (2)
37- 38 I2 h RAh Hour of Right Ascension (J2000)
40- 41 I2 min RAm Minute of Right Ascension (J2000)
43- 47 F5.2 s RAs Second of Right Ascension (J2000)
49- 50 I2 deg DEd Degree of Declination (J2000)
52- 53 I2 arcmin DEm Arcminute of Declination (J2000)
55- 60 F6.3 arcsec DEs Arcsecond of Declination (J2000)
62- 68 F7.4 arcsec/yr pmRA [-3.9/3.5] Proper motion in RA*cos(DE)
(µRA*cos(decl.)) from our best fit model
70- 76 F7.4 arcsec/yr pmDE [-5.2/10.4] Proper motion in Declination
(µDec) from our best fit model
78- 86 F9.4 d Date0 [2008.75/2012.75] Julian epoch of first data
point in our fit
88- 96 F9.4 d Date1 [2010.25/2013.5] Julian epoch of last data
point in our fit
98-103 F6.2 mas plxrel [5.7/546.4] Relative trigonometric parallax
105-108 F4.2 mas pcorr [0.8/4.3] Absolute parallax correction
(see Section 3.2 for details)
110-115 F6.2 mas plxabs [6.9/547.4] Absolute trigonometric parallax
117-121 F5.2 mas e_plxabs [0/26.7] Error in plxabs
123-128 F6.3 mag Jmag [5.24/12.86] 2MASS J band magnitude
130-135 F6.3 mag Kmag [4.02/12.86] 2MASS Ks band magnitude
137-141 F5.3 Msun Mass [0.074/0.792] MEarth estimated mass (3)
143-147 F5.3 Rsun Rad [0.137/0.772] MEarth estimated radius (4)
149-153 F5.3 Rsun e_Rad [0.007/0.039] Error in Rad (5)
155-159 I5 --- o_plxrel [11/10177] Number of data points in our fit
161-162 I2 --- Ns [7/90] Number of reference stars used in our
fit
164-166 A3 --- --- [tel]
167-168 I2 --- Tel [1/8] MEarth Telescope number data was taken
on (from 1 to 8) (6)
--------------------------------------------------------------------------------
Note (1): See Luyten et al. 1979 (cat. I/87), and Bakos et al. 2002
(cat. I/279).
Note (2): New Luyten catalogue of stars with proper motions larger than Two
Tenths of an arcsecond (NLTT; Luyten 1979, cat. I/98; see also Salim et al.
2003, cat. J/ApJ/582/1011).
Note (3): Using the Delfosse et al. (2000A&A...364..217D 2000A&A...364..217D) relation
(see Section 4.3).
Note (4): Using the Mass-Radius relation presented in Equation (10) of Boyajian
et al. 2012 (cat. J/ApJ/757/112).
Note (5): Equal to 5% the radius. Derived from the scatter in the Mass-Radius
relation presented by Boyajian et al. 2012 (cat. J/ApJ/757/112).
Note (6): The MEarth Observatory is an array consisting of eight identical f/9
40cm Ritchey-Chretien telescopes on German equatorial mounts at the Fred
Lawrence Whipple Observatory (FLWO) on Mount Hopkins, Arizona.
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Prepared by [AAS]; Sylvain Guehenneux [CDS] 01-Aug-2016