FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W2005429168> ?p ?o ?g. }

• W2005429168 abstract "Use of the highly sensitive Hokupa'a/Gemini curvature wavefront sensor has allowed, for the first time, direct adaptive optics (AO) guiding on very low mass (VLM) stars with cool spectral types (M8.0-L0.5). These low mass (<i>Mass</i> < 100 <i>M_JUPITER</i>) objects are very cool (<i>T_eff</i><3000K) and have very low luminosities (V ⪆ 20 at D = 20 pc) but are red enough (V-I ~ 4) for the Houkupa'a curvature WFS to guide on the reddest (&#955;_<i>eff</i>~ 0.8 &#956;m) photons. This is the only high-resolution (FWHM~0.1) survey ever of stars cooler than M7 from the ground. We guided on 39 such objects and detected 9 VLM binaries (7 of which were discovered for the first time to be binaries). Most of these systems (55%) are tight (separation <5 AU) and have similar masses (&#916; <i>Ks</i><0.8 mag; 0.85<<i>q</i><1.0). However, 2 systems (LHS 2397a, and 2M2331016-040618) have large &#916; <i>Ks</i>>2.38 mag and consist of a VLM star orbited by a much cooler L6.5-L8.5 brown dwarf companion. Based on our initial flux limited (<i>Ks</i><12 mag) survey of 39 M8.0-L0.5 stars (mainly from the sample of Gizis et al. 2000) we find a binary fraction in the range 19±7% for M8.0-L0.5 binaries with separations >2.6 AU. This is slightly less than the 32±9% measured for more massive (M0-M4) stars over the same separation range (Fischer & Marcy 1992). It appears M8.0-L0.5 binaries (as well as L and T dwarf binaries) have a much smaller semi-major axis distribution peak (~4 AU) compared to more massive M and G stars which have a broad peak at larger ~30 AU separations. We also find no VLM binaries (<i>M_tot</i><0.18 Msun) with separations >20 AU. We find that a velocity ``kick'' of ~3 km/s can reproduce the observed cut-off in the semi-major axis distribution at ~20 AU. This kick may have been from the VLM system being ejected from its formation mini-cluster." @default.
• W2005429168 created "2016-06-24" @default.
• W2005429168 creator A5034072669 @default.
• W2005429168 creator A5052406277 @default.
• W2005429168 creator A5084561682 @default.
• W2005429168 date "2003-02-01" @default.
• W2005429168 modified "2023-09-23" @default.
• W2005429168 title "Hokupa'a/Gemini survey of the lowest mass/faintest guide stars: the very low mass binary population and its implications for brown dwarf formation theories" @default.
• W2005429168 doi "https://doi.org/10.1117/12.458958" @default.
• W2005429168 hasPublicationYear "2003" @default.
• W2005429168 type Work @default.
• W2005429168 sameAs 2005429168 @default.
• W2005429168 citedByCount "0" @default.
• W2005429168 crossrefType "proceedings-article" @default.
• W2005429168 hasAuthorship W2005429168A5034072669 @default.
• W2005429168 hasAuthorship W2005429168A5052406277 @default.
• W2005429168 hasAuthorship W2005429168A5084561682 @default.
• W2005429168 hasConcept C121332964 @default.
• W2005429168 hasConcept C1276947 @default.
• W2005429168 hasConcept C13565188 @default.
• W2005429168 hasConcept C144024400 @default.
• W2005429168 hasConcept C149923435 @default.
• W2005429168 hasConcept C150846664 @default.
• W2005429168 hasConcept C163531172 @default.
• W2005429168 hasConcept C193786831 @default.
• W2005429168 hasConcept C2777106203 @default.
• W2005429168 hasConcept C2908647359 @default.
• W2005429168 hasConcept C44870925 @default.
• W2005429168 hasConceptScore W2005429168C121332964 @default.
• W2005429168 hasConceptScore W2005429168C1276947 @default.
• W2005429168 hasConceptScore W2005429168C13565188 @default.
• W2005429168 hasConceptScore W2005429168C144024400 @default.
• W2005429168 hasConceptScore W2005429168C149923435 @default.
• W2005429168 hasConceptScore W2005429168C150846664 @default.
• W2005429168 hasConceptScore W2005429168C163531172 @default.
• W2005429168 hasConceptScore W2005429168C193786831 @default.
• W2005429168 hasConceptScore W2005429168C2777106203 @default.
• W2005429168 hasConceptScore W2005429168C2908647359 @default.
• W2005429168 hasConceptScore W2005429168C44870925 @default.
• W2005429168 hasLocation W20054291681 @default.
• W2005429168 hasOpenAccess W2005429168 @default.
• W2005429168 hasPrimaryLocation W20054291681 @default.
• W2005429168 hasRelatedWork W1964919611 @default.
• W2005429168 hasRelatedWork W1972783630 @default.
• W2005429168 hasRelatedWork W1986109513 @default.
• W2005429168 hasRelatedWork W2029125027 @default.
• W2005429168 hasRelatedWork W2069375389 @default.
• W2005429168 hasRelatedWork W2108727745 @default.
• W2005429168 hasRelatedWork W3099434905 @default.
• W2005429168 hasRelatedWork W3101807576 @default.
• W2005429168 hasRelatedWork W3122088237 @default.
• W2005429168 hasRelatedWork W4210560529 @default.
• W2005429168 isParatext "false" @default.
• W2005429168 isRetracted "false" @default.
• W2005429168 magId "2005429168" @default.
• W2005429168 workType "article" @default.