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

研究成果: 雜誌貢獻期刊論文同行評審

16 引文 斯高帕斯(Scopus)

摘要

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.

原文英語
文章編號4
期刊Astrophysical Journal
801
發行號1
DOIs
出版狀態已發佈 - 2015 3月 1
對外發佈

ASJC Scopus subject areas

  • 天文和天體物理學
  • 空間與行星科學

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