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J/AJ/153/165          Collisions of terrestrial worlds         (Theissen+, 2017)

Collisions of terrestrial worlds: the occurrence of extreme mid-infrared excesses around low-mass field stars. Theissen C.A., West A.A. <Astron. J. 153, 165 (2017)> =2017AJ....153..165T (SIMBAD/NED BibCode)
ADC_Keywords: Models ; Stars, dwarfs ; Stars, M-type ; Equivalent widths ; Effective temperatures ; Photometry, infrared Keywords: circumstellar matter - infrared: stars - methods: statistical - planet-disk interactions - stars: late-type - stars: low-mass Abstract: We present the results of an investigation into the occurrence and properties (stellar age and mass trends) of low- mass field stars exhibiting extreme mid-infrared (MIR) excesses (LIR/L*~≳0.01). Stars for the analysis were initially selected from the Motion Verified Red Stars (MoVeRS) catalog of photometric stars with Sloan Digital Sky Survey, 2MASS, and WISE photometry and significant proper motions. We identify 584 stars exhibiting extreme MIR excesses, selected based on an empirical relationship for main-sequence W1-W3 colors. For a small subset of the sample, we show, using spectroscopic tracers of stellar age (Hα and LiI) and luminosity class, that the parent sample is most likely comprised of field dwarfs (>1Gyr). We also develop the Low-mass Kinematics (LoKi) galactic model to estimate the completeness of the extreme MIR excess sample. Using Galactic height as a proxy for stellar age, the completeness-corrected analysis indicates a distinct age dependence for field stars exhibiting extreme MIR excesses. We also find a trend with stellar mass (using r-z color as a proxy). Our findings are consistent with the detected extreme MIR excesses originating from dust created in a short-lived collisional cascade (<100000-years) during a giant impact between two large planetismals or terrestrial planets. These stars with extreme MIR excesses also provide support for planetary collisions being the dominant mechanism in creating the observed Kepler dichotomy (the need for more than a single mode, typically two, to explain the variety of planetary system architectures Kepler has observed), rather than different formation mechanisms. Description: Parameters for 584 low-mass stars showing signs of large infrared excesses. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table4.dat 908 584 Extreme MIR Excess Candidates Catalog table4.fits 2880 150 Fits version of table 4 fig10.dat 88 15 List of 2MASS source with spectra sp/* 65 15 Individual spectra
See also: II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) II/328 : AllWISE Data Release (Cutri+ 2013) J/AJ/151/41 : Motion Verified Red Stars (MoVeRS) (Theissen+, 2016) : SDSS DR10 Home page Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 19 I19 --- objID SDSS DR10 Object ID (SDSS_OBJID) 21- 30 F10.6 deg RAdeg SDSS Right ascension (J2000.0) (SDSS_RA) 32- 41 F10.6 deg DEdeg SDSS Declination (J2000.0) (SDSS_DEC) 43- 49 F7.4 mag umag SDSS u-band PSF magnitude (UMAG) 51- 58 F8.4 mag e_umag SDSS u-band PSF magnitude error (UMAG_ERR) 60- 66 F7.4 mag Au SDSS u-band PSF extinction (UMAG_EXT) 68- 74 F7.4 mag umag0 SDSS u-band PSF unredenned magnitude (UMAG_UNRED) 76- 82 F7.4 mag gmag SDSS g-band PSF magnitude (GMAG) 84- 90 F7.4 mag e_gmag SDSS g-band PSF magnitude error (GMAG_ERR) 92- 98 F7.4 mag Ag SDSS g-band PSF extinction (GMAG_EXT) 100-106 F7.4 mag gmag0 SDSS g-band PSF unredenned magnitude (GMAG_UNRED) 108-114 F7.4 mag rmag SDSS r-band PSF magnitude (RMAG) 116-122 F7.4 mag e_rmag SDSS r-band PSF magnitude error (RMAG_ERR) 124-130 F7.4 mag Ar SDSS r-band PSF extinction (RMAG_EXT) 132-138 F7.4 mag rmag0 SDSS r-band PSF unredenned magnitude (RMAG_UNRED) 140-146 F7.4 mag imag SDSS i-band PSF magnitude (IMAG) 148-154 F7.4 mag e_imag SDSS i-band PSF magnitude error (IMAG_ERR) 156-162 F7.4 mag Ai SDSS i-band PSF extinction (IMAG_EXT) 164-170 F7.4 mag imag0 SDSS i-band PSF unredenned magnitude (IMAG_UNRED) 172-178 F7.4 mag zmag SDSS z-band PSF magnitude (ZMAG) 180-186 F7.4 mag e_zmag SDSS z-band PSF magnitude error (ZMAG_ERR) 188-194 F7.4 mag Az SDSS z-band PSF extinction (ZMAG_EXT) 196-202 F7.4 mag zmag0 SDSS z-band PSF unredenned magnitude (ZMAG_UNRED) 204-209 F6.3 mag Jmag 2MASS J-band PSF magnitude (JMAG) 211-219 F9.3 mag e_Jmag ?=-9999 2MASS J-band PSF corrected magnitude uncertainty (JMAG_ERR) 221-229 F9.3 mag s_Jmag ?=-9999 2MASS J-band PSF total magnitude uncertainty (JMAG_ERRTOT) 231-237 F7.1 --- JSNR [2.6/10905.1]?=-9999 2MASS J-band SNR (JSNR) 239-246 F8.2 --- Jchi ?=-9999 2MASS J-band chi2 PSF fit (J_PSFCHI) 248-254 F7.4 mag AJ 2MASS J-band PSF extinction (JMAG_EXT) 256-261 F6.3 mag Jmag0 2MASS J-band PSF unredenned magnitude (JMAG_UNRED) 263-268 F6.3 mag Hmag 2MASS H-band PSF magnitude (HMAG) 270-278 F9.3 mag e_Hmag ?=-9999 2MASS H-band PSF corrected magnitude uncertainty (HMAG_ERR) 280-288 F9.3 mag s_Hmag ?=-9999 2MASS H-band PSF total magnitude uncertainty (HMAG_ERRTOT) 290-296 F7.1 --- HSNR [2.4/21632.7]?=-9999 2MASS H-band SNR (HSNR) 298-305 F8.2 --- Hchi ?=-9999 2MASS H-band chi2 PSF fit (H_PSFCHI) 307-313 F7.4 mag AH 2MASS H-band PSF extinction (HMAG_EXT) 315-320 F6.3 mag Hmag0 2MASS H-band PSF unredenned magnitude (HMAG_UNRED) 322-327 F6.3 mag Kmag 2MASS K-band PSF magnitude (KMAG) 329-337 F9.3 mag e_Kmag ?=-9999 2MASS K-band PSF corrected magnitude uncertainty (KMAG_ERR) 339-347 F9.3 mag s_Kmag ?=-9999 2MASS K-band PSF total magnitude uncertainty (KMAG_ERRTOT) 349-355 F7.1 --- KSNR [2.1/27594.3]?=-9999 2MASS K-band SNR (KSNR) 357-364 F8.2 --- Kchi ?=-9999 2MASS K-band chi2 PSF fit (K_PSFCHI) 366-372 F7.4 mag AK 2MASS K-band PSF extinction (KMAG_EXT) 374-379 F6.3 mag Kmag0 2MASS K-band PSF unredenned magnitude (KMAG_UNRED) 381-383 A3 --- Q2 2MASS photometric quality flag (2MASSPHQUAL) 385-387 A3 --- f2r 2MASS read flag (2MASSRDFLG) 389-391 A3 --- f2b 2MASS blend flag (2MASSBLFLG) 393-395 A3 --- f2c 2MASS contamination and confusion flag (2MASSCCFLG) 397 I1 --- f2e [0/2] 2MASS extended source contamination flag (2MASSGALCONTAM) 399-404 F6.3 mag W1mag WISE W1-band PSF magnitude (W1MPRO) 406-414 F9.3 mag e_W1mag ?=-9999 WISE W1-band PSF magnitude error (W1SIGMPRO) 416-422 F7.1 --- W1SNR [1.7/51.8]?=-9999 WISE W1-band SNR (W1SNR) 424-432 F9.6 --- W1chi [0.08/61.91] WISE W1 reduced chi2 PSF fit (W1RCHI2) 434-440 F7.4 mag AW1 WISE W1-band PSF extinction (W1MPRO_EXT) 442-447 F6.3 mag W1mag0 WISE W1-band PSF unredenned magnitude (W1MPRO_UNRED) 449-454 F6.3 mag W2mag WISE W2-band PSF magnitude (W2MPRO) 456-464 F9.3 mag e_W2mag ?=-9999 WISE W2-band PSF magnitude error (W2SIGMPRO) 466-469 F4.1 --- W2SNR [-0.4/57.2] WISE W2-band SNR (W2SNR) 471-479 F9.6 --- W2chi [0.19/33.1] WISE W2 reduced chi2 PSF fit (W2RCHI2) 481-487 F7.4 mag AW2 WISE W2-band PSF extinction (W2MPRO_EXT) 489-494 F6.3 mag W2mag0 WISE W2-band PSF unredenned magnitude (W2MPRO_UNRED) 496-504 F9.3 mag W3mag ?=-9999 WISE W3-band PSF magnitude (W3MPRO) 506-514 F9.3 mag e_W3mag ?=-9999 WISE W3-band PSF magnitude error (W3SIGMPRO) 516-522 F7.1 --- W3SNR [-14/83.4]?=-9999 WISE W3-band SNR (W3SNR) 524-530 F7.1 --- W3chi [0.5/3630]?=-9999 WISE W3 reduced chi2 PSF fit (W3RCHI2) 532-538 F7.4 mag AW3 WISE W3-band PSF extinction (W3MPRO_EXT) 540-548 F9.3 mag W3mag0 ?=-9999 WISE W3-band PSF unredenned magnitude (W3MPRO_UNRED) 550-558 F9.3 mag W4mag ?=-9999 WISE W4-band PSF magnitude (W4MPRO) 560-568 F9.3 mag e_W4mag ?=-9999 WISE W4-band PSF magnitude error (W4SIGMPRO) 570-576 F7.1 --- W4SNR [-4.4/54.8]?=-9999 WISE W4-band SNR (W4SNR) 578-584 F7.1 --- W4chi [0.5/2459]?=-9999 WISE W4 reduced chi2 PSF fit (W4RCHI2) 586-592 F7.4 mag AW4 WISE W4-band PSF extinction (W4MPRO_EXT) 594-602 F9.3 mag W4mag0 ?=-9999 WISE W4-band PSF unredenned magnitude (W4MPRO_UNRED) 604-607 A4 --- fWcc WISE contamination and confusion flag (WISECCFLG) 609 I1 --- fWe WISE extended source flag (WISEEXTFLG) 611-614 A4 --- fWv WISE variability flag (WISEVARFLG) 616-619 A4 --- QW WISE photometric quality flag (WISEPHQUAL) 621-629 F9.3 uJy I1f ?=-9999 Spitzer IRAC CH1 flux (IRAC1_FLUX) 631-639 F9.3 uJy e_I1f ?=-9999 Spitzer IRAC CH1 flux error (IRAC1FLUXERR) 641-649 F9.3 uJy I2f ?=-9999 Spitzer IRAC CH2 flux (IRAC2_FLUX) 651-659 F9.3 uJy e_I2f ?=-9999 Spitzer IRAC CH2 flux error (IRAC2FLUXERR) 661-669 F9.3 uJy I3f ?=-9999 Spitzer IRAC CH3 flux (IRAC3_FLUX) 671-679 F9.3 uJy e_I3f ?=-9999 Spitzer IRAC CH3 flux error (IRAC3FLUXERR) 681-689 F9.3 uJy I4f ?=-9999 Spitzer IRAC CH4 flux (IRAC4_FLUX) 691-699 F9.3 uJy e_I4f ?=-9999 Spitzer IRAC CH4 flux error (IRAC4FLUXERR) 701-709 F9.3 uJy M1f ?=-9999 Spitzer MIPS CH1 flux (MIPS1_FLUX) 711-719 F9.3 uJy e_M1f ?=-9999 Spitzer MIPS CH1 flux error (MIPS1FLUXERR) 721-731 F11.5 mas/yr pmRA Proper motion in RA (proper units, i.e. pmRA*cos(DE) (PMRA) 733-742 F10.5 mas/yr pmDE Proper motion in DE (PMDEC) 744-752 F9.5 mas/yr e_pmRA Combined error in proper motion in RA (PMRA_TOTERR) 754-762 F9.5 mas/yr e_pmDE Combined error in proper motion in DE (PMDEC_TOTERR) 764 I1 --- fl1f Full Sample flag (FULL) 766 I1 --- fl1c Full Sample flag (CLEAN) 768 I1 --- Qual [1/2] Quality flag, 1=best (QUALITY) (1) 770-778 F9.5 pc Dist Photometric parallax distance (DISTANCE) (2) 780-789 F10.5 pc Z Distance from the Galactic plane (Z=0) (Z) 791-799 F9.5 --- sigP SigmaPrime (SIMGAPRIME) (3) 801-807 F7.2 K Temp Modeled temperature (TEMP) 809-815 F7.2 K E_Temp Modeled temperature upper limit (TEMP_HIGH) 817-823 F7.2 K e_Temp Modeled temperature lower limit (TEMP_LOW) 825-831 F7.5 [cm/s2] logg Modeled surface gravity (LOGG) 833-839 F7.5 [cm/s2] E_logg Modeled logg upper limit (LOGG_HIGH) 841-847 F7.5 [cm/s2] e_logg Modeled logg lower limit (LOGG_LOW) 849-856 F8.5 --- chi12 Ratio of measured 12 micron flux to modeled 12 micron flux (CHI12) 858-865 F8.5 --- chi22 ?=- Ratio of measured 12 micron flux to modeled 12 micron flux (CHI22) 867-874 F8.6 --- Lir Fractional IR luminosity (FRACTIONAL_LUMINOSITY) 876-883 F8.6 AU Rd Dust radius (DUST_DISTANCE) 885-896 E12.6 --- Md Dust mass, in moon mass unit (DUST_MASS) 898-902 I5 K Td ?=-9999 Disk temperature (DUST_TEMP) 904-908 I5 K e_Td ?=-9999 Disk temperature error (DUSTTEMPERR)
Note (1): Quality 1 representing the highest-quality candidates and quality 2 representing the lowest-quality candidates. Note (2): Computed using the relationships in Bochanski et al., 2010AJ....139.2679B Note (3): Defined in Avenhaus et al., 2012A&A...548A.105A. σ' is the WISE error estimate, and outliers are defined as sources that diverge from the fit by more than 3{simga}'
Byte-by-byte Description of file: fig10.dat
Bytes Format Units Label Explanations
1- 2 I2 h RAh Right Ascension J2000 (hours) 4- 5 I2 min RAm Right Ascension J2000 (minutes) 7- 13 F7.4 s RAs Right Ascension J2000 (seconds) 15 A1 --- DE- Declination J2000 (sign) 16- 17 I2 deg DEd Declination J2000 (degrees) 19- 20 I2 arcmin DEm Declination J2000 (minutes) 22- 28 F7.4 arcsec DEs Declination J2000 (seconds) 30- 34 A5 --- --- [2MASS] 36- 52 A17 --- 2MASS 2MASS designation (JHHMMSSss+DDmmsss) 54- 56 A3 --- SpType MK spectral type 58- 61 I4 km/s RVel Radial velocity 63- 88 A26 --- FileName Name of file with spectrum in subdirectory sp
Byte-by-byte Description of file: sp/*
Bytes Format Units Label Explanations
1- 23 E23.18 10mW/m2/nm Flux Flux (erg/cm2/s/Å) 25- 46 E22.17 10mW/m2/nm e_Flux rms uncertainty on Flux (erg/cm2/s/Å) 48- 65 F18.13 0.1nm lambda Wavelength
Acknowledgements: Christopher Theissen, ctheisse(at)
(End) Christopher Theissen [BU, USA], Patricia Vannier [CDS] 04-Apr-2017
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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