Discovery of nine new companions to nearby young M stars with the altair AO system

Sebastian Daemcen, Nick Siegler, I. Neill Reid, Laird M Close

Research output: Contribution to journalArticle

39 Citations (Scopus)

Abstract

We present results of a high-resolution, near-infrared survey of 41 nearby, young (≲300 Myr) M0-M5.0 dwarfs using the Altair natural guide star adaptive optics system at the Gemini North telescope. Twelve of the objects appear to be binaries, seven of which are reported here for the first time. One triple system was discovered. Statistical properties are studied and compared with earlier (F to K) and later (≥M6 very low mass [VLM]) populations. We find that the separation distribution of the binaries in this sample peaks at 13-9+14 AD, which is consistent with previous measurements of early M binaries. Hence, early M binaries seem to occur in - on average - tighter systems than G binaries. At the same time they are significantly wider than field VLM binary stars. The distribution of mass ratios q of primary and secondary stars was found to show an intermediate distribution between the strongly q → 1 peaked distribution of field VLM systems and the almost flat distribution of earlier type stars. Consequently, we show evidence for relatively young, early M binaries representing a transition between the well-known earlier star distributions and the recently examined field VLM population characteristics. Despite the fact that this survey was dedicated to the search for faint brown dwarf and planetary mass companions, all planetary mass candidates were background objects. We exclude the existence of physical companions with masses greater than 10 Jupiter masses (MJ) at separations of ≳40 AU and masses greater than 24MJ for separations ≳10 AU around 37 of the 41 observed objects.

Original languageEnglish (US)
Pages (from-to)558-569
Number of pages12
JournalAstrophysical Journal
Volume654
Issue number1 I
DOIs
StatePublished - Jan 1 2007

Fingerprint

M stars
planetary mass
stars
early stars
star distribution
young
binary stars
Jupiter (planet)
adaptive optics
population characteristics
mass ratios
Jupiter
telescopes
distribution
near infrared
high resolution

Keywords

  • Binaries: general
  • Instrumentation: adaptive optics
  • Stars: late-type
  • Stars: low-mass, brown dwarfs

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Discovery of nine new companions to nearby young M stars with the altair AO system. / Daemcen, Sebastian; Siegler, Nick; Reid, I. Neill; Close, Laird M.

In: Astrophysical Journal, Vol. 654, No. 1 I, 01.01.2007, p. 558-569.

Research output: Contribution to journalArticle

Daemcen, Sebastian ; Siegler, Nick ; Reid, I. Neill ; Close, Laird M. / Discovery of nine new companions to nearby young M stars with the altair AO system. In: Astrophysical Journal. 2007 ; Vol. 654, No. 1 I. pp. 558-569.
@article{85c1ed6d18fc405f9b9785e37f0df290,
title = "Discovery of nine new companions to nearby young M stars with the altair AO system",
abstract = "We present results of a high-resolution, near-infrared survey of 41 nearby, young (≲300 Myr) M0-M5.0 dwarfs using the Altair natural guide star adaptive optics system at the Gemini North telescope. Twelve of the objects appear to be binaries, seven of which are reported here for the first time. One triple system was discovered. Statistical properties are studied and compared with earlier (F to K) and later (≥M6 very low mass [VLM]) populations. We find that the separation distribution of the binaries in this sample peaks at 13-9+14 AD, which is consistent with previous measurements of early M binaries. Hence, early M binaries seem to occur in - on average - tighter systems than G binaries. At the same time they are significantly wider than field VLM binary stars. The distribution of mass ratios q of primary and secondary stars was found to show an intermediate distribution between the strongly q → 1 peaked distribution of field VLM systems and the almost flat distribution of earlier type stars. Consequently, we show evidence for relatively young, early M binaries representing a transition between the well-known earlier star distributions and the recently examined field VLM population characteristics. Despite the fact that this survey was dedicated to the search for faint brown dwarf and planetary mass companions, all planetary mass candidates were background objects. We exclude the existence of physical companions with masses greater than 10 Jupiter masses (MJ) at separations of ≳40 AU and masses greater than 24MJ for separations ≳10 AU around 37 of the 41 observed objects.",
keywords = "Binaries: general, Instrumentation: adaptive optics, Stars: late-type, Stars: low-mass, brown dwarfs",
author = "Sebastian Daemcen and Nick Siegler and Reid, {I. Neill} and Close, {Laird M}",
year = "2007",
month = "1",
day = "1",
doi = "10.1086/509109",
language = "English (US)",
volume = "654",
pages = "558--569",
journal = "Astrophysical Journal",
issn = "0004-637X",
publisher = "IOP Publishing Ltd.",
number = "1 I",

}

TY - JOUR

T1 - Discovery of nine new companions to nearby young M stars with the altair AO system

AU - Daemcen, Sebastian

AU - Siegler, Nick

AU - Reid, I. Neill

AU - Close, Laird M

PY - 2007/1/1

Y1 - 2007/1/1

N2 - We present results of a high-resolution, near-infrared survey of 41 nearby, young (≲300 Myr) M0-M5.0 dwarfs using the Altair natural guide star adaptive optics system at the Gemini North telescope. Twelve of the objects appear to be binaries, seven of which are reported here for the first time. One triple system was discovered. Statistical properties are studied and compared with earlier (F to K) and later (≥M6 very low mass [VLM]) populations. We find that the separation distribution of the binaries in this sample peaks at 13-9+14 AD, which is consistent with previous measurements of early M binaries. Hence, early M binaries seem to occur in - on average - tighter systems than G binaries. At the same time they are significantly wider than field VLM binary stars. The distribution of mass ratios q of primary and secondary stars was found to show an intermediate distribution between the strongly q → 1 peaked distribution of field VLM systems and the almost flat distribution of earlier type stars. Consequently, we show evidence for relatively young, early M binaries representing a transition between the well-known earlier star distributions and the recently examined field VLM population characteristics. Despite the fact that this survey was dedicated to the search for faint brown dwarf and planetary mass companions, all planetary mass candidates were background objects. We exclude the existence of physical companions with masses greater than 10 Jupiter masses (MJ) at separations of ≳40 AU and masses greater than 24MJ for separations ≳10 AU around 37 of the 41 observed objects.

AB - We present results of a high-resolution, near-infrared survey of 41 nearby, young (≲300 Myr) M0-M5.0 dwarfs using the Altair natural guide star adaptive optics system at the Gemini North telescope. Twelve of the objects appear to be binaries, seven of which are reported here for the first time. One triple system was discovered. Statistical properties are studied and compared with earlier (F to K) and later (≥M6 very low mass [VLM]) populations. We find that the separation distribution of the binaries in this sample peaks at 13-9+14 AD, which is consistent with previous measurements of early M binaries. Hence, early M binaries seem to occur in - on average - tighter systems than G binaries. At the same time they are significantly wider than field VLM binary stars. The distribution of mass ratios q of primary and secondary stars was found to show an intermediate distribution between the strongly q → 1 peaked distribution of field VLM systems and the almost flat distribution of earlier type stars. Consequently, we show evidence for relatively young, early M binaries representing a transition between the well-known earlier star distributions and the recently examined field VLM population characteristics. Despite the fact that this survey was dedicated to the search for faint brown dwarf and planetary mass companions, all planetary mass candidates were background objects. We exclude the existence of physical companions with masses greater than 10 Jupiter masses (MJ) at separations of ≳40 AU and masses greater than 24MJ for separations ≳10 AU around 37 of the 41 observed objects.

KW - Binaries: general

KW - Instrumentation: adaptive optics

KW - Stars: late-type

KW - Stars: low-mass, brown dwarfs

UR - http://www.scopus.com/inward/record.url?scp=33846515785&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33846515785&partnerID=8YFLogxK

U2 - 10.1086/509109

DO - 10.1086/509109

M3 - Article

AN - SCOPUS:33846515785

VL - 654

SP - 558

EP - 569

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 1 I

ER -