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 M Hinz, Alfio Puglisi, Marco Xompero, Runa Briguglio

Research output: Contribution to journalArticle

11 Citations (Scopus)

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

Fingerprint

photometry
extinction
estimates
adaptive optics
accretion
wavelength
proper motion
extremely high frequencies
CCD cameras
wavelengths
point sources
point source
luminosity
young
rate

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

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

New extinction and mass estimates from optical photometry of the very low mass brown dwarf companion ct Chamaeleontis b with the Magellan AO system. / Wu, Ya Lin; Close, Laird M; Males, Jared R.; Barman, Travis S; Morzinski, Katie M.; Follette, Katherine B.; Bailey, Vanessa; Rodigas, Timothy J.; Hinz, Philip M; Puglisi, Alfio; Xompero, Marco; Briguglio, Runa.

In: Astrophysical Journal, Vol. 801, No. 1, 4, 01.03.2015.

Research output: Contribution to journalArticle

Wu, Ya Lin ; Close, Laird M ; Males, Jared R. ; Barman, Travis S ; Morzinski, Katie M. ; Follette, Katherine B. ; Bailey, Vanessa ; Rodigas, Timothy J. ; Hinz, Philip M ; Puglisi, Alfio ; Xompero, Marco ; Briguglio, Runa. / New extinction and mass estimates from optical photometry of the very low mass brown dwarf companion ct Chamaeleontis b with the Magellan AO system. In: Astrophysical Journal. 2015 ; Vol. 801, No. 1.
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