SIMBAD references

2014ApJ...796..129C - Astrophys. J., 796, 129 (2014/December-1)

A pulsation search among young brown dwarfs and very-low-mass stars.


Abstract (from CDS):

In 2005, Palla & Baraffe proposed that brown dwarfs (BDs) and very-low-mass stars (VLMSs; < 0.1 solar masses) may be unstable to radial oscillations during the pre-main-sequence deuterium burning phase. With associated periods of one to four hours, this potentially new class of pulsation offers unprecedented opportunities to probe the interiors and evolution of low-mass objects in the 1-15 million year age range. Following up on reports of short-period variability in young clusters, we designed a high-cadence photometric monitoring campaign to search for deuterium-burning pulsation among a sample of 348 BDs and VLMSs in the four young clusters σ Orionis, Chamaeleon I, IC 348, and Upper Scorpius. In the resulting light curves we achieved sensitivity to periodic signals of amplitude several millimagnitudes, on timescales from 15 minutes to two weeks. Despite the exquisite data quality, we failed to detect any periodicities below seven hours. We conclude that D-burning pulsations are not able to grow to observable amplitudes in the early pre-main sequence. In spite of the nondetection, we did uncover a rich set of variability behavior–both periodic and aperiodic–on day to week timescales. We present new compilations of variable sources from our sample, as well as three new candidate cluster members in Chamaeleon I.

Abstract Copyright:

Journal keyword(s): brown dwarfs - open clusters and associations: individual: (Chamaeleon I, IC 348, σ Orionis, Upper Scorpius) - stars: low-mass - stars: oscillations - stars: variables: general

Status at CDS : Examining the need for a new acronym.

Simbad objects: 207

goto Full paper

goto View the references in ADS

To bookmark this query, right click on this link: simbad:2014ApJ...796..129C and select 'bookmark this link' or equivalent in the popup menu


© Université de Strasbourg/CNRS

    • Contact