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- Muirhead, Philip, et al.
(författare)
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Characterizing the Cool KOIs. VI. H- and K-band Spectra of Kepler M Dwarf Planet-candidate Hosts
- 2014
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Ingår i: Astrophysical Journal Supplement Series. - : American Astronomical Society. - 0067-0049 .- 1538-4365. ; 213:1, s. 5-
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Tidskriftsartikel (refereegranskat)abstract
- We present H - and K -band spectra for late-type Kepler Objects of Interest (the "Cool KOIs"): low-mass stars with transiting-planet candidates discovered by NASA’s Kepler Mission that are listed on the NASA Exoplanet Archive. We acquired spectra of 103 Cool KOIs and used the indices and calibrations of Rojas-Ayala et al. to determine their spectral types, stellar effective temperatures, and metallicities, significantly augmenting previously published values. We interpolate our measured effective temperatures and metallicities onto evolutionary isochrones to determine stellar masses, radii, luminosities, and distances, assuming the stars have settled onto the main sequence. As a choice of isochrones, we use a new suite of Dartmouth predictions that reliably include mid-to-late M dwarf stars. We identify five M4V stars: KOI-961 (confirmed as Kepler 42), KOI-2704, KOI-2842, KOI-4290, and the secondary component to visual binary KOI-1725, which we call KOI-1725 B. We also identify a peculiar star, KOI-3497, which has Na and Ca lines consistent with a dwarf star but CO lines consistent with a giant. Visible-wavelength adaptive optics imaging reveals two objects within a 1 arcsec diameter; however, the objects’ colors are peculiar. The spectra and properties presented in this paper serve as a resource for prioritizing follow-up observations and planet validation efforts for the Cool KOIs and are all available for download online using the "data behind the figure" feature.
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| 2. |
- Sim, Fiona, et al.
(författare)
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Language and social/emotional problems identified at a universal developmental assessment at 30 months.
- 2013
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Ingår i: BMC pediatrics. - : Springer Science and Business Media LLC. - 1471-2431. ; 13:206
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Tidskriftsartikel (refereegranskat)abstract
- Background Preschool language and neurodevelopmental problems often persist and impe de learning. The aims of the current study are to assess the uptake of a new univer sal 30 month health visitor contact and to quantify the prevalence of language delay and social/emotional dif ficulties. Methods All families of 30 month old children in four Glasgow localities were offered a visit from their health visitor. Structured data were collected relating t o language, social and emotional development using three instruments; The Strengths and Difficulties Questionnaire (SDQ), the abbreviated Sure Start Language Measure and a two-item language s creen. Results From an eligible population of 543 children, there was a 90% return rat e of contact forms from the health visitors, and assessments were completed on 78% of e ligible children. Visit completion rates did not differ significantly by socio-economic st atus. 3-8% of children were reported to have language delay depending on the method of asses sment. 8.8% of children scored in the “abnormal” range of SDQ total difficulties scores and 31.1% had an abnormality in at least one subscale. There was substantial over lap between language delay and abnormal scores on the SDQ. Conclusions Universal assessment of neurodevelopmental function at 30 months identifi ed a significant proportion of children, including those previously considered at low risk, wit h both language and social/emotional difficulties. Further work is required to asses s the precise nature of these difficulties and to assess the potential impact on services.
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