M dwarfs in the b201 tile of the VVV survey: Colour-based selection, spectral types and light curves

Bárbara Rojas-Ayala, Daniela Iglesias, Dante Minniti, Roberto K. Saito, Francisco Surot

Resultado de la investigación: Article

5 Citas (Scopus)

Resumen

Context. The intrinsically faint M dwarfs are the most numerous stars in the Galaxy, have main-sequence lifetimes longer than the Hubble time, and host some of the most interesting planetary systems known to date. Their identification and classification throughout the Galaxy is crucial to unraveling the processes involved in the formation of planets, stars, and the Milky Way. The ESO Public Survey VVV is a deep near-IR survey mapping the Galactic bulge and southern plane. The VVV b201 tile, located in the border area of the bulge, was specifically selected for the characterisation of M dwarfs. Aims. We used VISTA photometry to identify M dwarfs in the VVV b201 tile, to estimate their subtypes, and to search for transit-like light curves from the first 26 epochs of the survey. Methods. UKIDSS photometry from SDSS spectroscopically identified M dwarfs was used to calculate their expected colours in the YJHKs VISTA system. A colour-based spectral subtype calibration was computed. Possible giants were identified by a (J-Ks,HJ) reduced proper motion diagram. The light curves of 12.8 <Ks< 15.8 colour-selected M dwarfs were inspected for signals consistent with transiting objects. Results. We identified 23 345 objects in VVV b201 with colours consistent with M dwarfs. We provided their spectral types and photometric distances, up to ~300 pc for M9s and ~1.2 kpc for M4s, from photometry. In the range 12 <Ks< 16, we identified 753 stars as possible giants out of 9232 M dwarf candidates. While only the first 26 epochs of VVV were available, and 1 epoch was excluded, we were already able to identify transit-like signals in the light curves of 95 M dwarfs and of 12 possible giants. Conclusions. Thanks to its deeper photometry (~4 mag deeper than 2MASS), the VVV survey will be a major contributor to the discovery and study of M dwarfs and possible companions towards the centre of the Milky Way.

Idioma originalEnglish
Número de artículoA36
PublicaciónAstronomy and Astrophysics
Volumen571
DOI
EstadoPublished - 1 nov 2014

Huella dactilar

tiles
light curve
photometry
color
time measurement
curves
transit
stars
galaxies
galactic bulge
planetary systems
border region
proper motion
European Southern Observatory
borders
planets
planet
diagram
diagrams
calibration

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Citar esto

Rojas-Ayala, Bárbara ; Iglesias, Daniela ; Minniti, Dante ; Saito, Roberto K. ; Surot, Francisco. / M dwarfs in the b201 tile of the VVV survey : Colour-based selection, spectral types and light curves. En: Astronomy and Astrophysics. 2014 ; Vol. 571.
@article{c19be705c4f740f887cc65b61a2cf8c6,
title = "M dwarfs in the b201 tile of the VVV survey: Colour-based selection, spectral types and light curves",
abstract = "Context. The intrinsically faint M dwarfs are the most numerous stars in the Galaxy, have main-sequence lifetimes longer than the Hubble time, and host some of the most interesting planetary systems known to date. Their identification and classification throughout the Galaxy is crucial to unraveling the processes involved in the formation of planets, stars, and the Milky Way. The ESO Public Survey VVV is a deep near-IR survey mapping the Galactic bulge and southern plane. The VVV b201 tile, located in the border area of the bulge, was specifically selected for the characterisation of M dwarfs. Aims. We used VISTA photometry to identify M dwarfs in the VVV b201 tile, to estimate their subtypes, and to search for transit-like light curves from the first 26 epochs of the survey. Methods. UKIDSS photometry from SDSS spectroscopically identified M dwarfs was used to calculate their expected colours in the YJHKs VISTA system. A colour-based spectral subtype calibration was computed. Possible giants were identified by a (J-Ks,HJ) reduced proper motion diagram. The light curves of 12.8 <Ks< 15.8 colour-selected M dwarfs were inspected for signals consistent with transiting objects. Results. We identified 23 345 objects in VVV b201 with colours consistent with M dwarfs. We provided their spectral types and photometric distances, up to ~300 pc for M9s and ~1.2 kpc for M4s, from photometry. In the range 12 <Ks< 16, we identified 753 stars as possible giants out of 9232 M dwarf candidates. While only the first 26 epochs of VVV were available, and 1 epoch was excluded, we were already able to identify transit-like signals in the light curves of 95 M dwarfs and of 12 possible giants. Conclusions. Thanks to its deeper photometry (~4 mag deeper than 2MASS), the VVV survey will be a major contributor to the discovery and study of M dwarfs and possible companions towards the centre of the Milky Way.",
keywords = "Galaxy: bulge, Stars: fundamental parameters, Stars: low-mass, Surveys",
author = "B{\'a}rbara Rojas-Ayala and Daniela Iglesias and Dante Minniti and Saito, {Roberto K.} and Francisco Surot",
year = "2014",
month = "11",
day = "1",
doi = "10.1051/0004-6361/201424066",
language = "English",
volume = "571",
journal = "Astronomy and Astrophysics",
issn = "0004-6361",
publisher = "EDP Sciences",

}

M dwarfs in the b201 tile of the VVV survey : Colour-based selection, spectral types and light curves. / Rojas-Ayala, Bárbara; Iglesias, Daniela; Minniti, Dante; Saito, Roberto K.; Surot, Francisco.

En: Astronomy and Astrophysics, Vol. 571, A36, 01.11.2014.

Resultado de la investigación: Article

TY - JOUR

T1 - M dwarfs in the b201 tile of the VVV survey

T2 - Colour-based selection, spectral types and light curves

AU - Rojas-Ayala, Bárbara

AU - Iglesias, Daniela

AU - Minniti, Dante

AU - Saito, Roberto K.

AU - Surot, Francisco

PY - 2014/11/1

Y1 - 2014/11/1

N2 - Context. The intrinsically faint M dwarfs are the most numerous stars in the Galaxy, have main-sequence lifetimes longer than the Hubble time, and host some of the most interesting planetary systems known to date. Their identification and classification throughout the Galaxy is crucial to unraveling the processes involved in the formation of planets, stars, and the Milky Way. The ESO Public Survey VVV is a deep near-IR survey mapping the Galactic bulge and southern plane. The VVV b201 tile, located in the border area of the bulge, was specifically selected for the characterisation of M dwarfs. Aims. We used VISTA photometry to identify M dwarfs in the VVV b201 tile, to estimate their subtypes, and to search for transit-like light curves from the first 26 epochs of the survey. Methods. UKIDSS photometry from SDSS spectroscopically identified M dwarfs was used to calculate their expected colours in the YJHKs VISTA system. A colour-based spectral subtype calibration was computed. Possible giants were identified by a (J-Ks,HJ) reduced proper motion diagram. The light curves of 12.8 <Ks< 15.8 colour-selected M dwarfs were inspected for signals consistent with transiting objects. Results. We identified 23 345 objects in VVV b201 with colours consistent with M dwarfs. We provided their spectral types and photometric distances, up to ~300 pc for M9s and ~1.2 kpc for M4s, from photometry. In the range 12 <Ks< 16, we identified 753 stars as possible giants out of 9232 M dwarf candidates. While only the first 26 epochs of VVV were available, and 1 epoch was excluded, we were already able to identify transit-like signals in the light curves of 95 M dwarfs and of 12 possible giants. Conclusions. Thanks to its deeper photometry (~4 mag deeper than 2MASS), the VVV survey will be a major contributor to the discovery and study of M dwarfs and possible companions towards the centre of the Milky Way.

AB - Context. The intrinsically faint M dwarfs are the most numerous stars in the Galaxy, have main-sequence lifetimes longer than the Hubble time, and host some of the most interesting planetary systems known to date. Their identification and classification throughout the Galaxy is crucial to unraveling the processes involved in the formation of planets, stars, and the Milky Way. The ESO Public Survey VVV is a deep near-IR survey mapping the Galactic bulge and southern plane. The VVV b201 tile, located in the border area of the bulge, was specifically selected for the characterisation of M dwarfs. Aims. We used VISTA photometry to identify M dwarfs in the VVV b201 tile, to estimate their subtypes, and to search for transit-like light curves from the first 26 epochs of the survey. Methods. UKIDSS photometry from SDSS spectroscopically identified M dwarfs was used to calculate their expected colours in the YJHKs VISTA system. A colour-based spectral subtype calibration was computed. Possible giants were identified by a (J-Ks,HJ) reduced proper motion diagram. The light curves of 12.8 <Ks< 15.8 colour-selected M dwarfs were inspected for signals consistent with transiting objects. Results. We identified 23 345 objects in VVV b201 with colours consistent with M dwarfs. We provided their spectral types and photometric distances, up to ~300 pc for M9s and ~1.2 kpc for M4s, from photometry. In the range 12 <Ks< 16, we identified 753 stars as possible giants out of 9232 M dwarf candidates. While only the first 26 epochs of VVV were available, and 1 epoch was excluded, we were already able to identify transit-like signals in the light curves of 95 M dwarfs and of 12 possible giants. Conclusions. Thanks to its deeper photometry (~4 mag deeper than 2MASS), the VVV survey will be a major contributor to the discovery and study of M dwarfs and possible companions towards the centre of the Milky Way.

KW - Galaxy: bulge

KW - Stars: fundamental parameters

KW - Stars: low-mass

KW - Surveys

UR - http://www.scopus.com/inward/record.url?scp=84908673272&partnerID=8YFLogxK

U2 - 10.1051/0004-6361/201424066

DO - 10.1051/0004-6361/201424066

M3 - Article

AN - SCOPUS:84908673272

VL - 571

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

SN - 0004-6361

M1 - A36

ER -