Identifying the Young Low-Mass Stars Within 25 Pc. I. Spectroscopic Observations

Shkolnik, Evgenya L.; Liu, Mengmeng; Reid, I. Neill

doi:10.1088/0004-637x/699/1/649

Cited by 199 publications

(241 citation statements)

References 88 publications

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“…This would not alter our conclusion that the object is X-ray active as a recalculation of F X /F J would result in the object lying even further above the inactive M dwarf regime on fig. 3 of Shkolnik et al (2009). If we were relying solely on X-ray emission for an age diagnostic, we would estimate that this object is younger than the Hyades (i.e.…”

Section: The Age Of 2mass J0213+3648 Abmentioning

confidence: 98%

2MASS 0213+3648 C: A wide T3 benchmark companion to an an active, old M dwarf binary

Deacon

Magnier

Liu

et al. 2017

Mon. Not. R. Astron. Soc.

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We present the discovery of a 360 AU separation T3 companion to the tight (3.1 AU) M4.5+M6.5 binary 2MASS J02132062+3648506. This companion was identified using Pan-STARRS 1 data and, despite its relative proximity to the Sun (22.2 +6.4 −4.0 pc; Pan-STARRS 1 parallax) and brightness (J=15.3), appears to have been missed by previous studies due to its position near a diffraction spike in 2MASS. The close M dwarf binary has active X-ray and Hα emission and shows evidence for UV flares. The binary's weak GALEX UV emission and strong Na I 8200 Å Na absorption leads us to an age range of ∼1-10 Gyr. Applying this age range to evolutionary models implies the wide companion has a mass of 0.063±0.009 M ⊙ . 2MASS J02132+3648 C provides a relatively old benchmark close to the L/T transition and acts as a key, older comparison to the much younger early-T companions HN Peg B and GU Psc b.

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Section: The Age Of 2mass J0213+3648 Abmentioning

confidence: 98%

2MASS 0213+3648 C: A wide T3 benchmark companion to an an active, old M dwarf binary

Deacon

Magnier

Liu

et al. 2017

Mon. Not. R. Astron. Soc.

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“…(a) Some other publications and meta-archives that we have searched for potential CARMENES targets are Kirkpatrick et al (1991), Gizis (1997), Gizis & Reid (1997), Gizis et al (2000b), Henry et al (2002Henry et al ( , 2006, Mochnacki et al (2002), Gray et al (2003), Bochanski et al (2005), Crifo et al (2005), Lodieu et al (2005), Scholz et al (2005), Phan-Bao & Bessell (2006), Reylé et al (2006), Riaz et al (2006), Caballero (2007Caballero ( , 2009Caballero ( , 2012, Gatewood & Coban (2009), Shkolnik et al (2009, 2012, Bergfors et al (2010), Johnson et al (2010), Boyd et al (2011), Irwin et al (2011), West et al (2011, Avenhaus et al (2012), Deacon et al (2012), Janson et al (2012, 2014), Frith et al (2013, Jódar et al (2013), Malo et al (2013), Aberasturi et al (2014), Dieterich et al (2014), Riedel et al (2014), Yi et al (2014), , and the DwarfArchive at http://dwarfarchive.org. (b) PMSU: Reid et al (1995Reid et al ( , 2002; Hawley et al (1996); Gizis et al (2002).…”

Section: Carmenes Samplementioning

confidence: 99%

“…It has also been classified as a single M7 Ve star from optical spectra Reid et al 2003;Gatewood & Coban 2009;Reiners & Basri 2009), but as an M6 V with surface gravity consistent with normal field dwarfs from near-infrared spectra (Allers & Liu 2013). From high-resolution spectroscopy (pEW(Hα) = -22.3 Å) and ROSAT X-ray count rates, Shkolnik et al (2009) assigned J07523+162 an age of about 100 Ma, younger than the Pleiades. However, Reiners & Basri (2010) observed flaring activity in a J07523+162 spectrum (pEW(Hα) = −44.4 Å) and Gagné et al (2014) and Klutsch et al (2014) were not able to determine membership in any known stellar kinematic group.…”

Section: Hα Emissionmentioning

confidence: 99%

CARMENES input catalogue of M dwarfs

Alonso-Floriano¹,

Morales²,

Caballero³

et al. 2015

A&A

189

178

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Context. CARMENES is a stabilised, high-resolution, double-channel spectrograph at the 3.5 m Calar Alto telescope. It is optimally designed for radial-velocity surveys of M dwarfs with potentially habitable Earth-mass planets. Aims. We prepare a list of the brightest, single M dwarfs in each spectral subtype observable from the northern hemisphere, from which we will select the best planet-hunting targets for CARMENES. Methods. In this first paper on the preparation of our input catalogue, we compiled a large amount of public data and collected lowresolution optical spectroscopy with CAFOS at the 2.2 m Calar Alto telescope for 753 stars. We derived accurate spectral types using a dense grid of standard stars, a double least-squares minimisation technique, and 31 spectral indices previously defined by other authors. Additionally, we quantified surface gravity, metallicity, and chromospheric activity for all the stars in our sample. Results. We calculated spectral types for all 753 stars, of which 305 are new and 448 are revised. We measured pseudo-equivalent widths of Hα for all the stars in our sample, concluded that chromospheric activity does not affect spectral typing from our indices, and tabulated 49 stars that had been reported to be young stars in open clusters, moving groups, and stellar associations. Of the 753 stars, two are new subdwarf candidates, three are T Tauri stars, 25 are giants, 44 are K dwarfs, and 679 are M dwarfs. Many of the 261 investigated dwarfs in the range M4.0-8.0 V are among the brightest stars known in their spectral subtype. Conclusions. This collection of low-resolution spectroscopic data serves as a candidate target list for the CARMENES survey and can be highly valuable for other radial-velocity surveys of M dwarfs and for studies of cool dwarfs in the solar neighbourhood.

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“…They found that X-ray luminosity "saturates" (that there is an upper limit to the amount of quiescent X-ray emission) at a value of log(L X / L bol )∼−3. Shkolnik et al (2009) used emission from ROSAT as a signature of youth to build a census of low-mass stars within 25 pc. They combined the ROSAT data with spectroscopic follow-up to identify spectroscopic binaries and estimate stellar ages, surface gravities, and magnetic activity.…”

Section: Introductionmentioning

confidence: 99%

A Catalog of Galex Ultraviolet Emission From Spectroscopically Confirmed M Dwarfs*

Jones¹,

West²

2016

ApJ

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We present a catalog of Galaxy Evolution Explorer Near-UV (NUV) and Far-UV (FUV) photometry for the Palomar/MSU and SDSS DR7 spectroscopic M dwarf catalogs. The catalog contains NUV measurements matched to 577 spectroscopically confirmed M dwarfs and FUV measurements matched to 150 spectroscopically confirmed M dwarfs. Using these data, we find that NUV and FUV luminosities strongly correlate with Hα emission, a typical indicator of magnetic activity in M dwarfs. We also examine the fraction of M dwarfs with varying degrees of strong line emission at NUV wavelengths. Our results indicate that the frequency of M dwarf NUV emission peaks at intermediate spectral types, with at least ∼30% of young M4-M5 dwarfs having some level of activity. For mid-type M dwarfs, we show that NUV emission decreases with distance from the Galactic plane, a proxy for stellar age. Our complete matched source catalog is available online.

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Identifying the Young Low-Mass Stars Within 25 Pc. I. Spectroscopic Observations

Cited by 199 publications

References 88 publications

2MASS 0213+3648 C: A wide T3 benchmark companion to an an active, old M dwarf binary

2MASS 0213+3648 C: A wide T3 benchmark companion to an an active, old M dwarf binary

CARMENES input catalogue of M dwarfs

A Catalog of Galex Ultraviolet Emission From Spectroscopically Confirmed M Dwarfs*

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