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

doi:10.1088/0004-637X/801/1/4

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 journal › Article › peer-review

20 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 Y_S . 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 A_V = 3.4 ± 1.1 mag, and a mass of 14-24 M_J 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′, Y_S) allows for a better estimate of extinction, luminosity, and mass accretion rate of young substellar companions.

Original language	English
Article number	4
Journal	Astrophysical Journal
Volume	801
Issue number	1
DOIs	https://doi.org/10.1088/0004-637X/801/1/4
Publication status	Published - 2015 Mar 1
Externally published	Yes

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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10.1088/0004-637X/801/1/4

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Wu, Y. L., Close, L. M., Males, J. R., Barman, T. S., Morzinski, K. M., Follette, K. B., Bailey, V., Rodigas, T. J., Hinz, P., Puglisi, A., Xompero, M., & Briguglio, R. (2015). New extinction and mass estimates from optical photometry of the very low mass brown dwarf companion ct Chamaeleontis b with the Magellan AO system. Astrophysical Journal, 801(1), Article 4. https://doi.org/10.1088/0004-637X/801/1/4

Wu, YL, Close, LM, Males, JR, Barman, TS, Morzinski, KM, Follette, KB, Bailey, V, Rodigas, TJ, Hinz, P, Puglisi, A, Xompero, M & Briguglio, R 2015, 'New extinction and mass estimates from optical photometry of the very low mass brown dwarf companion ct Chamaeleontis b with the Magellan AO system', Astrophysical Journal, vol. 801, no. 1, 4. https://doi.org/10.1088/0004-637X/801/1/4

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

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.",

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

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

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doi = "10.1088/0004-637X/801/1/4",

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T1 - New extinction and mass estimates from optical photometry of the very low mass brown dwarf companion ct Chamaeleontis b with the Magellan AO system

AU - Wu, Ya Lin

AU - Close, Laird M.

AU - Males, Jared R.

AU - Barman, Travis S.

AU - Morzinski, Katie M.

AU - Follette, Katherine B.

AU - Bailey, Vanessa

AU - Rodigas, Timothy J.

AU - Hinz, Philip

AU - Puglisi, Alfio

AU - Xompero, Marco

AU - Briguglio, Runa

PY - 2015/3/1

Y1 - 2015/3/1

N2 - 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.

AB - 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.

KW - brown dwarfs

KW - instrumentation: adaptive optics

KW - planetary systems

KW - planets and satellites: individual (CT Cha B)

KW - stars: individual (CT Cha)

KW - stars: pre-main sequence

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JO - Astrophysical Journal

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

Abstract

Keywords

ASJC Scopus subject areas

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