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

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18 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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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

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