NEW EXTINCTION AND MASS ESTIMATES FROM OPTICAL PHOTOMETRY OF THE VERY LOW MASS BROWN DWARF COMPANION CT CHAMAELEONTIS B WITH THE MAGELLAN AO SYSTEM

被引：17

作者：

Wu, Ya-Lin ^{[1
]}

Close, Laird M. ^{[1
]}

Males, Jared R. ^{[1
]}

Barman, Travis S. ^{[2
]}

Morzinski, Katie M. ^{[1
]}

Follette, Katherine B. ^{[1
]}

Bailey, Vanessa ^{[1
]}

Rodigas, Timothy J. ^{[1
,3
]}

Hinz, Philip ^{[1
]}

Puglisi, Alfio ^{[4
]}

Xompero, Marco ^{[4
]}

Briguglio, Runa ^{[4
]}

机构：

[1] Univ Arizona, Steward Observ, Tucson, AZ 85721 USA

[2] Univ Arizona, Lunar & Planetary Lab, Tucson, AZ 85721 USA

[3] Carnegie Inst Sci, Dept Terr Magnetism, Washington, DC 20015 USA

[4] Osserv Astrofis Arcetri, INAF, I-50125 Florence, Italy

来源：

ASTROPHYSICAL JOURNAL | 2015年 / 801卷 / 01期

基金：

美国国家科学基金会;

关键词：

brown dwarfs; instrumentation: adaptive optics; planetary systems; planets and satellites: individual (CT Cha B); stars: individual (CT Cha); stars: pre-main sequence; CHAMELEON-I; STELLAR POPULATION; STARS; SPECTRA; EMISSION; CENSUS;

D O I：

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

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

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 Y-S. With our new photometry and T-eff similar to 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 H alpha emission and a mass accretion rate similar to 6 x 10(-10) M-circle dot 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.

引用

页数：6

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