HD 106906 b: A PLANETARY-MASS COMPANION OUTSIDE A MASSIVE DEBRIS DISK

被引：149

作者：

Bailey, Vanessa ^{[1
]}

Meshkat, Tiffany ^{[2
]}

Reiter, Megan ^{[1
]}

Morzinski, Katie ^{[1
]}

Males, Jared ^{[1
]}

Su, Kate Y. L. ^{[1
]}

Hinz, Philip M. ^{[1
]}

Kenworthy, Matthew ^{[2
]}

Stark, Daniel ^{[1
]}

Mamajek, Eric ^{[3
]}

Briguglio, Runa ^{[4
]}

Close, Laird M. ^{[1
]}

Follette, Katherine B. ^{[1
]}

Puglisi, Alfio ^{[4
]}

Rodigas, Timothy ^{[1
,5
]}

Weinberger, Alycia J. ^{[5
]}

Xompero, Marco ^{[4
]}

机构：

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

[2] Leiden Univ, Leiden Observ, NL-2300 RA Leiden, Netherlands

[3] Univ Rochester, Dept Phys & Astron, Rochester, NY 14627 USA

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

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

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2014年 / 780卷 / 01期

基金：

美国国家科学基金会;

关键词：

instrumentation: adaptive optics; open clusters and associations: individual (Lower Centaurus Crux); planet-disk interactions; planetary systems; stars: individual (HD 106906); DIRECT-IMAGING DISCOVERY; SOLAR-TYPE STARS; GIANT PLANETS; BROWN DWARFS; EVOLUTIONARY MODELS; FINDING CAMPAIGN; FREQUENCY; JUPITER; MULTIPLICITY; PHOTOMETRY;

D O I：

10.1088/2041-8205/780/1/L4

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report the discovery of a planetary-mass companion, HD 106906 b, with the new Magellan Adaptive Optics (MagAO) + Clio2 system. The companion is detected with Clio2 in three bands: J, K-S, and L', and lies at a projected separation of 7.'' 1 (650AU). It is confirmed to be comoving with its 13 +/- 2 Myr F5 host using Hubble Space Telescope Advanced Camera for Surveys astrometry over a time baseline of 8.3 yr. DUSTY and COND evolutionary models predict that the companion's luminosity corresponds to a mass of 11 +/- 2M(Jup), making it one of the most widely separated planetary-mass companions known. We classify its Magellan/Folded-Port InfraRed Echellette J/H/K spectrum as L2.5 +/- 1; the triangular H-band morphology suggests an intermediate surface gravity. HD 106906 A, a pre-main-sequence Lower Centaurus Crux member, was initially targeted because it hosts a massive debris disk detected via infrared excess emission in unresolved Spitzer imaging and spectroscopy. The disk emission is best fit by a single component at 95 K, corresponding to an inner edge of 15-20 AU and an outer edge of up to 120 AU. If the companion is on an eccentric (e > 0.65) orbit, it could be interacting with the outer edge of the disk. Close-in, planet-like formation followed by scattering to the current location would likely disrupt the disk and is disfavored. Furthermore, we find no additional companions, though we could detect similar-mass objects at projected separations > 35 AU. In situ formation in a binary-star-like process is more probable, although the companion-to-primary mass ratio, at <1%, is unusually small.

引用

页数：6

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