New extinction and mass estimates from optical photometry of the very low mass brown dwarf companion ct Chamaeleontis b with the Magellan AO system

Ya Lin Wu, Laird M. Close, Jared R. Males, Travis S. Barman, Katie M. Morzinski, Katherine B. Follette, Vanessa Bailey, Timothy J. Rodigas, Philip Hinz, Alfio Puglisi, Marco Xompero, Runa Briguglio

Research output: Contribution to journalArticle

12 Scopus citations

Abstract

We used the Magellan adaptive optics system and its VisAO CCD camera to image the young low mass brown dwarf companion CT Chamaeleontis B for the first time at visible wavelengths. We detect it at r′, i′, z′, and YS . With our new photometry and T eff 2500 K derived from the shape of its K-band spectrum, we find that CT Cha B has AV = 3.4 ± 1.1 mag, and a mass of 14-24 MJ according to the DUSTY evolutionary tracks and its 1-5 Myr age. The overluminosity of our r′ detection indicates that the companion has significant Hα emission and a mass accretion rate 6 × 10-10 M yr-1, similar to some substellar companions. Proper motion analysis shows that another point source within 2″ of CT Cha A is not physical. This paper demonstrates how visible wavelength adaptive optics photometry (r′, i′, z′, YS) allows for a better estimate of extinction, luminosity, and mass accretion rate of young substellar companions.

Original languageEnglish (US)
Article number4
JournalAstrophysical Journal
Volume801
Issue number1
DOIs
StatePublished - Mar 1 2015

Keywords

  • brown dwarfs
  • instrumentation: adaptive optics
  • planetary systems
  • planets and satellites: individual (CT Cha B)
  • stars: individual (CT Cha)
  • stars: pre-main sequence

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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